Pub Date : 2021-04-03DOI: 10.1080/13287982.2021.1908710
Md Riasat Azim
ABSTRACT In this paper, a non-parametric damage detection method for truss-type railroad bridges is presented. The method uses operational strain time-history responses to detect damage in truss elements, and change in support behaviour. Dynamic strain time-history responses obtained under baseline and unknown-state bridge conditions are used to compute the magnitudes of differences in strain values between two successive time-steps. A new damage-sensitive feature (DSF) is proposed as the change in percentage of the square root of the sum of squared values of these magnitudes. After establishing a threshold DSF based on the baseline bridge, further structural change or damage in the bridge could be detected and located by observing the values of the DSFs. The validity of the method is investigated through finite element analysis of a steel-truss railway bridge. It is demonstrated that the proposed method yields promising results for identifying, locating, and relatively assessing the damage, and could be useful even when different operational conditions (i.e. different train speeds and loads) and measurement noise influence the strain data. Therefore, the proposed method has the potential to assist in developing effective maintenance strategies for railway bridges.
{"title":"A Data-Driven Damage Assessment Tool for Truss-Type Railroad Bridges Using Train Induced Strain Time-History Response","authors":"Md Riasat Azim","doi":"10.1080/13287982.2021.1908710","DOIUrl":"https://doi.org/10.1080/13287982.2021.1908710","url":null,"abstract":"ABSTRACT In this paper, a non-parametric damage detection method for truss-type railroad bridges is presented. The method uses operational strain time-history responses to detect damage in truss elements, and change in support behaviour. Dynamic strain time-history responses obtained under baseline and unknown-state bridge conditions are used to compute the magnitudes of differences in strain values between two successive time-steps. A new damage-sensitive feature (DSF) is proposed as the change in percentage of the square root of the sum of squared values of these magnitudes. After establishing a threshold DSF based on the baseline bridge, further structural change or damage in the bridge could be detected and located by observing the values of the DSFs. The validity of the method is investigated through finite element analysis of a steel-truss railway bridge. It is demonstrated that the proposed method yields promising results for identifying, locating, and relatively assessing the damage, and could be useful even when different operational conditions (i.e. different train speeds and loads) and measurement noise influence the strain data. Therefore, the proposed method has the potential to assist in developing effective maintenance strategies for railway bridges.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":"36 1","pages":"147 - 162"},"PeriodicalIF":1.1,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73253702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-03DOI: 10.1080/13287982.2021.1909814
E. Gad, L. Pham, Jessey Lee, A. Amirsardari
ABSTRACT There is a need to improve the Australian conformance practice for construction products. This paper presents an overview of the current operating environment of Australia and discusses the different ways in which a product may not be fit for its intended use. Issues discussed in this paper include methods for identifying problematic products, multi-level conformity assessment system and how to make the Australian system perform better. Various institutions have made independent proposals to improve different aspects of the system. These efforts will be much more effective if coordinated into a national system.
{"title":"Product performance - a review of construction product conformity assessment","authors":"E. Gad, L. Pham, Jessey Lee, A. Amirsardari","doi":"10.1080/13287982.2021.1909814","DOIUrl":"https://doi.org/10.1080/13287982.2021.1909814","url":null,"abstract":"ABSTRACT There is a need to improve the Australian conformance practice for construction products. This paper presents an overview of the current operating environment of Australia and discusses the different ways in which a product may not be fit for its intended use. Issues discussed in this paper include methods for identifying problematic products, multi-level conformity assessment system and how to make the Australian system perform better. Various institutions have made independent proposals to improve different aspects of the system. These efforts will be much more effective if coordinated into a national system.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":"97 1","pages":"140 - 146"},"PeriodicalIF":1.1,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77012160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-03DOI: 10.1080/13287982.2021.1926061
K. Poongodi, P. Murthi
ABSTRACT Aggregates are the fundamental ingredient for making concrete. The incremental demand for aggregates in concrete is affecting the environment due to excessive exploitation of natural rocks. In an effort to conserve the natural resources and minimise the adverse impacts of industrial by-products in the environment, it is essential to explore the suitable alternate materials for construction. Under such circumstances, an attempt was made with coconut shell aggregate (CSA) as a substitute for conventional coarse aggregate (CA) in self-compacting concrete (SCC). In this investigation, binary and ternary blended SCC were developed using the mineral admixtures such as rice husk ash (RHA) and silica fume (SF). Two series of SCC were designed with the total powder content of 450 and 550 kg/m3 , respectively, for investigation. The effects of CSA in SCC on fresh and hardened properties were studied and compared with the results obtained without CSA. The results revealed that use of 75% CSA in SCC reduced the density below the threshold level of structural lightweight concrete (1850 kg/m3) in dry state. The CSA-based lightweight self-compacting concrete (LWSCC) possesses good fluidity, deformability, passing ability and filling ability in its fresh state. The compressive strength and elastic modulus of LWSCC were determined and found that the results are decreased after the substitution of more than 75% of CSA. Further, the paper intended to predict an appropriate correlation between compressive strength and elastic modulus of CSA-based LWSCC.
{"title":"Correlation between compressive strength and elastic modulus of light weight self-compacting concrete using coconut shell as coarse aggregate","authors":"K. Poongodi, P. Murthi","doi":"10.1080/13287982.2021.1926061","DOIUrl":"https://doi.org/10.1080/13287982.2021.1926061","url":null,"abstract":"ABSTRACT Aggregates are the fundamental ingredient for making concrete. The incremental demand for aggregates in concrete is affecting the environment due to excessive exploitation of natural rocks. In an effort to conserve the natural resources and minimise the adverse impacts of industrial by-products in the environment, it is essential to explore the suitable alternate materials for construction. Under such circumstances, an attempt was made with coconut shell aggregate (CSA) as a substitute for conventional coarse aggregate (CA) in self-compacting concrete (SCC). In this investigation, binary and ternary blended SCC were developed using the mineral admixtures such as rice husk ash (RHA) and silica fume (SF). Two series of SCC were designed with the total powder content of 450 and 550 kg/m3 , respectively, for investigation. The effects of CSA in SCC on fresh and hardened properties were studied and compared with the results obtained without CSA. The results revealed that use of 75% CSA in SCC reduced the density below the threshold level of structural lightweight concrete (1850 kg/m3) in dry state. The CSA-based lightweight self-compacting concrete (LWSCC) possesses good fluidity, deformability, passing ability and filling ability in its fresh state. The compressive strength and elastic modulus of LWSCC were determined and found that the results are decreased after the substitution of more than 75% of CSA. Further, the paper intended to predict an appropriate correlation between compressive strength and elastic modulus of CSA-based LWSCC.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":"1 1","pages":"85 - 95"},"PeriodicalIF":1.1,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88343507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-03DOI: 10.1080/13287982.2021.1923158
M. Tahir, Zhenyu Wang, Zhou Wei, Rizwan Jameel
ABSTRACT Fibre-reinforced polymer (FRP) bars have been acknowledged by the researchers as well as practitioners in the construction industry as effective alternatives to conventional steel in a corrosive environment. However, the application of FRP bars as longitudinal reinforcement in columns has not yet gained an adequate level of confidence due to limited research studies and lack of standard design guidelines. In the past, only a few studies have focused on FRP-reinforced concrete (FRP-RC) columns under eccentric loadings. This study focused on development of a finite element model (FEM) for FRP-RC columns subjected to axial compression loadings. FEM was calibrated against the test results of studies available in the literature. A design-oriented analytical model was developed using sectional analysis to calculate the axial load and bending moment capacity of FRP-RC columns. FEM and analytical model predicted load–displacement behaviour and peak load with close agreement to the test results. Finally, a parametric analysis was accomplished to explore the effect of concrete grade, FRP-reinforcement ratio, and slenderness ratio of columns. Based on the parametric study, it is recommended to reduce the limit of slenderness ratio to 14.2 and 21.2 for concrete columns, bent in single curvature, reinforced with GFRP and CFRP bars, respectively.
{"title":"Numerical and Analytical Modeling of FRP-Reinforced Concrete Columns Subjected to Compression Loading","authors":"M. Tahir, Zhenyu Wang, Zhou Wei, Rizwan Jameel","doi":"10.1080/13287982.2021.1923158","DOIUrl":"https://doi.org/10.1080/13287982.2021.1923158","url":null,"abstract":"ABSTRACT Fibre-reinforced polymer (FRP) bars have been acknowledged by the researchers as well as practitioners in the construction industry as effective alternatives to conventional steel in a corrosive environment. However, the application of FRP bars as longitudinal reinforcement in columns has not yet gained an adequate level of confidence due to limited research studies and lack of standard design guidelines. In the past, only a few studies have focused on FRP-reinforced concrete (FRP-RC) columns under eccentric loadings. This study focused on development of a finite element model (FEM) for FRP-RC columns subjected to axial compression loadings. FEM was calibrated against the test results of studies available in the literature. A design-oriented analytical model was developed using sectional analysis to calculate the axial load and bending moment capacity of FRP-RC columns. FEM and analytical model predicted load–displacement behaviour and peak load with close agreement to the test results. Finally, a parametric analysis was accomplished to explore the effect of concrete grade, FRP-reinforcement ratio, and slenderness ratio of columns. Based on the parametric study, it is recommended to reduce the limit of slenderness ratio to 14.2 and 21.2 for concrete columns, bent in single curvature, reinforced with GFRP and CFRP bars, respectively.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":"65 1","pages":"96 - 109"},"PeriodicalIF":1.1,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91107434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-03DOI: 10.1080/13287982.2021.1918376
J. Holmes
ABSTRACT This paper reviews the numbers of tropical cyclones in the southern Indian Ocean, and the land-falling cyclones that have impacted the Pilbara and Gascoyne coastlines of Western Australia since 1970, with particular emphasis on those of Category 4 strength and above. It shows reductions in impacts of severe cyclones on that coastline in the most recent two decades. Nearly as many severe cyclones have impacted the coast outside the current northern boundary of Region D in AS/NZS 1170.2 as have occurred within that boundary, suggesting the limits of Region D may need reviewing. Recorded and corrected extreme wind gusts exceeding 22 m/s from eight coastal stations have been processed as a group, and individually for 3 stations with long records. This indicates that the extreme value distribution in the draft standard DR AS/NZS 1170.2:2020 is quite adequate, without any additional factors, but the predicted extreme wind speeds for Carnarvon are well under the Region D specifications. The calculated wind direction multipliers for Region D show higher values from east and northeast; this can be explained by the wind directions generated by the clockwise rotations created by the cyclonic vortices, as the storms cross the coastline, or as they pass along the coastline at near full strength.
{"title":"Tropical cyclone impacts on the Western Australian coast and extreme wind speeds in Region D","authors":"J. Holmes","doi":"10.1080/13287982.2021.1918376","DOIUrl":"https://doi.org/10.1080/13287982.2021.1918376","url":null,"abstract":"ABSTRACT This paper reviews the numbers of tropical cyclones in the southern Indian Ocean, and the land-falling cyclones that have impacted the Pilbara and Gascoyne coastlines of Western Australia since 1970, with particular emphasis on those of Category 4 strength and above. It shows reductions in impacts of severe cyclones on that coastline in the most recent two decades. Nearly as many severe cyclones have impacted the coast outside the current northern boundary of Region D in AS/NZS 1170.2 as have occurred within that boundary, suggesting the limits of Region D may need reviewing. Recorded and corrected extreme wind gusts exceeding 22 m/s from eight coastal stations have been processed as a group, and individually for 3 stations with long records. This indicates that the extreme value distribution in the draft standard DR AS/NZS 1170.2:2020 is quite adequate, without any additional factors, but the predicted extreme wind speeds for Carnarvon are well under the Region D specifications. The calculated wind direction multipliers for Region D show higher values from east and northeast; this can be explained by the wind directions generated by the clockwise rotations created by the cyclonic vortices, as the storms cross the coastline, or as they pass along the coastline at near full strength.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":"73 1","pages":"110 - 119"},"PeriodicalIF":1.1,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85820660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-03DOI: 10.1080/13287982.2021.1912518
Mohamed A. Farouk, Khaled F. Khalil
ABSTRACT Computing the moments in RC structures after the yield by linear elastic analysis can lead to an inaccurate assessment of the behaviour due to the nonlinear behaviour. Therefore, it can become necessary to use more advanced methodologies to achieve a higher degree of performance optimisation of structures than those resulting from the simplified approaches adopted by existing design codes based on linear elastic analysis with redistribution of internal forces. The moment redistribution is supposed to start after occurring the cracks of concrete, but with small ratio. In this study, the moment redistribution before the yielding will be neglected, and the redistribution is focused after the yield. This paper suggests a mathematical model to investigate the moment redistribution in RC beams after yielding analytically. In the suggested mathematical model, the beam after forming the plastic hinges is converted into a virtual beam that can be analysed by structural linear analysis. The plastic hinges in the virtual beam will be represented as rotational springs having a linear rotational stiffness against the induced moment. The actual moments can be found through derived relationships in the mathematical model between it and the virtual moment. The mathematical model was verified and it gave values of moment matching experimental results. Also, a comparison for degree of moment redistribution among the suggested mathematical model and several design codes was performed. The analytical results indicate that the proposed mathematical model can be used for analysis of moment redistribution of RC beams.
{"title":"New analytical method for computing moment redistribution in RC beams under concentrated load","authors":"Mohamed A. Farouk, Khaled F. Khalil","doi":"10.1080/13287982.2021.1912518","DOIUrl":"https://doi.org/10.1080/13287982.2021.1912518","url":null,"abstract":"ABSTRACT Computing the moments in RC structures after the yield by linear elastic analysis can lead to an inaccurate assessment of the behaviour due to the nonlinear behaviour. Therefore, it can become necessary to use more advanced methodologies to achieve a higher degree of performance optimisation of structures than those resulting from the simplified approaches adopted by existing design codes based on linear elastic analysis with redistribution of internal forces. The moment redistribution is supposed to start after occurring the cracks of concrete, but with small ratio. In this study, the moment redistribution before the yielding will be neglected, and the redistribution is focused after the yield. This paper suggests a mathematical model to investigate the moment redistribution in RC beams after yielding analytically. In the suggested mathematical model, the beam after forming the plastic hinges is converted into a virtual beam that can be analysed by structural linear analysis. The plastic hinges in the virtual beam will be represented as rotational springs having a linear rotational stiffness against the induced moment. The actual moments can be found through derived relationships in the mathematical model between it and the virtual moment. The mathematical model was verified and it gave values of moment matching experimental results. Also, a comparison for degree of moment redistribution among the suggested mathematical model and several design codes was performed. The analytical results indicate that the proposed mathematical model can be used for analysis of moment redistribution of RC beams.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":"45 1","pages":"120 - 139"},"PeriodicalIF":1.1,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80257299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-02DOI: 10.1080/13287982.2021.1876439
M. A. Alam, A. Sami
ABSTRACT Optimisation of CFRP shear strip in presence of connectors/anchors is the current interest to reduce retrofitting cost of structures. The main aim of this research was to propose design guideline considering strain compatibility nature between shear reinforcement and externally bonded CFRP laminate to optimise the dimension of CFRP laminate for shear strengthening of RC beam in presence of embedded connectors. The guideline had been experimentally verified through the structural investigations on five reinforced concrete beams. Results showed that the proposed guideline with connectors reduced the dimension of CFRP laminate significantly. The optimal strengthened beams had shown the highest flexural capacities, maximum ductility and cost effective structural performances. Shear reinforcement and externally bonded CFRP laminate had shown identical nature of strains until shear crack and micro debonding of laminate. The optimal strengthened beams with connector did not fail by shear or debonding of laminates prior to theoretical design shear capacities of beams. The design shear capacities of optimal strengthened beams (182 kN) were very close to those of flexural failure loads (181 kN and 184 kN). Overall experimental results satisfactorily verified the proposed design guideline.
{"title":"Strain compatibility model to optimise CFRP laminate for shear strengthening of RC beam","authors":"M. A. Alam, A. Sami","doi":"10.1080/13287982.2021.1876439","DOIUrl":"https://doi.org/10.1080/13287982.2021.1876439","url":null,"abstract":"ABSTRACT Optimisation of CFRP shear strip in presence of connectors/anchors is the current interest to reduce retrofitting cost of structures. The main aim of this research was to propose design guideline considering strain compatibility nature between shear reinforcement and externally bonded CFRP laminate to optimise the dimension of CFRP laminate for shear strengthening of RC beam in presence of embedded connectors. The guideline had been experimentally verified through the structural investigations on five reinforced concrete beams. Results showed that the proposed guideline with connectors reduced the dimension of CFRP laminate significantly. The optimal strengthened beams had shown the highest flexural capacities, maximum ductility and cost effective structural performances. Shear reinforcement and externally bonded CFRP laminate had shown identical nature of strains until shear crack and micro debonding of laminate. The optimal strengthened beams with connector did not fail by shear or debonding of laminates prior to theoretical design shear capacities of beams. The design shear capacities of optimal strengthened beams (182 kN) were very close to those of flexural failure loads (181 kN and 184 kN). Overall experimental results satisfactorily verified the proposed design guideline.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":"61 1","pages":"59 - 72"},"PeriodicalIF":1.1,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76687191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-02DOI: 10.1080/13287982.2021.1872978
A. Chourasia, Shubham Singhal, P. Bhargava
ABSTRACT Different codes provide a range of values for structural behaviour factor for various masonry building systems. High variation in structural behaviour factors in different codes arises mainly due to the lack of information from experimental studies. Thus, the present paper highlights investigation of behaviour of different masonry construction systems through full-scale tests on masonry buildings subjected to cyclic displacement. Six tests, out of which three on virgin masonry building systems, employing unreinforced masonry (URM), reinforced masonry (RM) and confined masonry (CM) having similar geometrical, material, constructional features and test procedures were conducted. The remaining three building models tested included repaired unreinforced masonry (URM-REP), retrofitted unreinforced masonry (URM-RET) and retrofitted reinforced masonry (RM-RET). Observations and data from the experiments have been co-related between damage index, grade of damage and displacement capacity, thereby estimation of structural behaviour factor for different masonry building typologies. The analysis shows that the ranges of structural behaviour factor mentioned in codes are adequate for URM and RM, while the same for CM is conservative, which can be relaxed. Also, it has been noticed that there is a substantial increase in structural behaviour factor for repaired and retrofitted masonry structures, thus proving the structural adequacy of retrofitting measures.
{"title":"Damage limitation and structural behaviour factor for masonry structures","authors":"A. Chourasia, Shubham Singhal, P. Bhargava","doi":"10.1080/13287982.2021.1872978","DOIUrl":"https://doi.org/10.1080/13287982.2021.1872978","url":null,"abstract":"ABSTRACT Different codes provide a range of values for structural behaviour factor for various masonry building systems. High variation in structural behaviour factors in different codes arises mainly due to the lack of information from experimental studies. Thus, the present paper highlights investigation of behaviour of different masonry construction systems through full-scale tests on masonry buildings subjected to cyclic displacement. Six tests, out of which three on virgin masonry building systems, employing unreinforced masonry (URM), reinforced masonry (RM) and confined masonry (CM) having similar geometrical, material, constructional features and test procedures were conducted. The remaining three building models tested included repaired unreinforced masonry (URM-REP), retrofitted unreinforced masonry (URM-RET) and retrofitted reinforced masonry (RM-RET). Observations and data from the experiments have been co-related between damage index, grade of damage and displacement capacity, thereby estimation of structural behaviour factor for different masonry building typologies. The analysis shows that the ranges of structural behaviour factor mentioned in codes are adequate for URM and RM, while the same for CM is conservative, which can be relaxed. Also, it has been noticed that there is a substantial increase in structural behaviour factor for repaired and retrofitted masonry structures, thus proving the structural adequacy of retrofitting measures.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":"1 1","pages":"19 - 28"},"PeriodicalIF":1.1,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79872117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-02DOI: 10.1080/13287982.2021.1889089
Anup Kc, F. Javidan
ABSTRACT Recent developments in technology and manufacturing of steel has led to a significant increase in the strength of this material while keeping the weight constant. This has resulted in an increase in the application of high strength steel material in structural practice and consequently a rising demand in updated design guidelines. The present research covers compression experiments and design of ultra-high strength steel hollow circular members with a nominal yield strength of 1250 MPa. The performance is compared against two other grades of steel: Mild Steel grade 300 and high strength steel grade 750. Different section geometries are modelled using finite element software and validated against the experimental compression tests. A parametric analysis is conducted on a range of section geometries and lengths and the result are compared against current design guidelines of AS4100, and AISC360. The compressive performance is studied considering both the section slenderness and the member slenderness ratios. The results show that as the member slenderness and yield strength of the sections increase, the standard predictions give a more conservative prediction of the compression capacity. Using proposed modifications for member slenderness limits and compression capacity factors, design recommendations are suggested for grade 1200 steel
{"title":"Circular hollow compression members of grade 1200 steel: experiments and design","authors":"Anup Kc, F. Javidan","doi":"10.1080/13287982.2021.1889089","DOIUrl":"https://doi.org/10.1080/13287982.2021.1889089","url":null,"abstract":"ABSTRACT Recent developments in technology and manufacturing of steel has led to a significant increase in the strength of this material while keeping the weight constant. This has resulted in an increase in the application of high strength steel material in structural practice and consequently a rising demand in updated design guidelines. The present research covers compression experiments and design of ultra-high strength steel hollow circular members with a nominal yield strength of 1250 MPa. The performance is compared against two other grades of steel: Mild Steel grade 300 and high strength steel grade 750. Different section geometries are modelled using finite element software and validated against the experimental compression tests. A parametric analysis is conducted on a range of section geometries and lengths and the result are compared against current design guidelines of AS4100, and AISC360. The compressive performance is studied considering both the section slenderness and the member slenderness ratios. The results show that as the member slenderness and yield strength of the sections increase, the standard predictions give a more conservative prediction of the compression capacity. Using proposed modifications for member slenderness limits and compression capacity factors, design recommendations are suggested for grade 1200 steel","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":"161 1","pages":"73 - 83"},"PeriodicalIF":1.1,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80201305","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-02DOI: 10.1080/13287982.2021.1872994
Saranya Ilango, Vivek Singh, Chayanika Gogoi
ABSTRACT The utilization of industrial waste as a partial replacement in construction materials has been increasing rapidly in recent years. This Paper investigates the performance of reinforced concrete columns comprising of recycled aggregates, fly ash and synthetic fibres in varying percentage, under monotonic and thermal loads. Ten full scale reinforced concrete columns of size 150 x 150 x 750 mm were experimentally studied under compressive loads. Results of the experiment showed that the polypropylene (PP) fibre reinforced fly ash column with recycled aggregate consisting of 1.5% PP fibre, 15% fly ash and 25% recycled aggregates exhibited better load carrying and deflection capacities and was further considered for numerical analysis. The conventional column was modelled as a control specimen and the behaviour of polypropylene fibre-reinforced fly ash column with recycled aggregate was comparatively studied under the action of thermal loads in ABAQUS. In order to understand the effect of fibre-reinforced polymer (FRP) rebar reinforcement in columns under thermal loads, a parametric study was carried out by varying the type of reinforcement, using carbon fibre-reinforced polymer rebar (CFRP) and glass fibre-reinforced polymer rebar (GFRP). The polypropylene fibre-reinforced fly ash column with recycled aggregate reinforced with CFRP rebars exhibited better performance under thermal loads.
{"title":"Effect of fly ash cement and polypropylene fibre on the performance of recycled aggregate concrete column under thermal loading: Experimental and numerical study","authors":"Saranya Ilango, Vivek Singh, Chayanika Gogoi","doi":"10.1080/13287982.2021.1872994","DOIUrl":"https://doi.org/10.1080/13287982.2021.1872994","url":null,"abstract":"ABSTRACT The utilization of industrial waste as a partial replacement in construction materials has been increasing rapidly in recent years. This Paper investigates the performance of reinforced concrete columns comprising of recycled aggregates, fly ash and synthetic fibres in varying percentage, under monotonic and thermal loads. Ten full scale reinforced concrete columns of size 150 x 150 x 750 mm were experimentally studied under compressive loads. Results of the experiment showed that the polypropylene (PP) fibre reinforced fly ash column with recycled aggregate consisting of 1.5% PP fibre, 15% fly ash and 25% recycled aggregates exhibited better load carrying and deflection capacities and was further considered for numerical analysis. The conventional column was modelled as a control specimen and the behaviour of polypropylene fibre-reinforced fly ash column with recycled aggregate was comparatively studied under the action of thermal loads in ABAQUS. In order to understand the effect of fibre-reinforced polymer (FRP) rebar reinforcement in columns under thermal loads, a parametric study was carried out by varying the type of reinforcement, using carbon fibre-reinforced polymer rebar (CFRP) and glass fibre-reinforced polymer rebar (GFRP). The polypropylene fibre-reinforced fly ash column with recycled aggregate reinforced with CFRP rebars exhibited better performance under thermal loads.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":"130 1","pages":"42 - 58"},"PeriodicalIF":1.1,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77400153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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