Pub Date : 2023-05-08DOI: 10.1080/13287982.2023.2209353
M. N. Haque, M. K. Talukder
ABSTRACT This paper explores the potentiality of a proposed strengthening technique named as Far Surface Mounted (FSM) reinforcement for flexural strengthening of RC beam. In this technique the reinforcement is mounted in the tension face of the beam away from the existing beam surface and cast new concrete to increase the flexural capacity of the beam. Results of total 14 tested beams are analysed and presented here in this paper. To evaluate the performance of the new strengthening technique, the load-deflection behaviours of the beams strengthened with new technique are compared with the results of control beam and another beam strengthened with Near Surface Mounted (NSM) reinforcement method. It was found that the beam strengthened with new technique has higher flexural capacity than the control beam and beam strengthened with NSM technique. The influence of shear key spacing and inter-surface locking behaviour are also explored. In most of the cases, it found that the final failure modes are the shear and deboning of the added layer of concrete for the beams strengthened with new technique.
{"title":"Potentiality of far surface-mounted reinforcement for flexural strengthening of reinforced concrete beam","authors":"M. N. Haque, M. K. Talukder","doi":"10.1080/13287982.2023.2209353","DOIUrl":"https://doi.org/10.1080/13287982.2023.2209353","url":null,"abstract":"ABSTRACT This paper explores the potentiality of a proposed strengthening technique named as Far Surface Mounted (FSM) reinforcement for flexural strengthening of RC beam. In this technique the reinforcement is mounted in the tension face of the beam away from the existing beam surface and cast new concrete to increase the flexural capacity of the beam. Results of total 14 tested beams are analysed and presented here in this paper. To evaluate the performance of the new strengthening technique, the load-deflection behaviours of the beams strengthened with new technique are compared with the results of control beam and another beam strengthened with Near Surface Mounted (NSM) reinforcement method. It was found that the beam strengthened with new technique has higher flexural capacity than the control beam and beam strengthened with NSM technique. The influence of shear key spacing and inter-surface locking behaviour are also explored. In most of the cases, it found that the final failure modes are the shear and deboning of the added layer of concrete for the beams strengthened with new technique.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":"97 7 1","pages":"228 - 242"},"PeriodicalIF":1.1,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80943047","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 : 2023-04-17DOI: 10.1080/13287982.2023.2197320
Yashwanth Pamu, Prasanna Svsndl
ABSTRACT This manuscript proposes an experimental analysis for clay bricks manufacturing with partial replacement of glass wool. The physical, mechanical and durability features of bricks infused with various percentage of glass wool are tested. Thermal conductivity, water absorption, compressive strength, density and linear shrinkage are the properties tested for the bricks. These tests indicated that 4% glass wool infused bricks gave maximum compressive strength and minimum thermal conductivity compared to control brick. Life cycle assessment on construction of a residential building indicated that clay brick masonry causes the highest environmental impacts among all construction materials. The addition of glass wool to clay bricks may be a convincing alternative to traditional clay bricks. The quantity of clay used in brick manufacturing can be reduced by infusing glass wool into the bricks.
{"title":"An experimental analysis for clay bricks manufacturing with partial replacement of glass wool","authors":"Yashwanth Pamu, Prasanna Svsndl","doi":"10.1080/13287982.2023.2197320","DOIUrl":"https://doi.org/10.1080/13287982.2023.2197320","url":null,"abstract":"ABSTRACT This manuscript proposes an experimental analysis for clay bricks manufacturing with partial replacement of glass wool. The physical, mechanical and durability features of bricks infused with various percentage of glass wool are tested. Thermal conductivity, water absorption, compressive strength, density and linear shrinkage are the properties tested for the bricks. These tests indicated that 4% glass wool infused bricks gave maximum compressive strength and minimum thermal conductivity compared to control brick. Life cycle assessment on construction of a residential building indicated that clay brick masonry causes the highest environmental impacts among all construction materials. The addition of glass wool to clay bricks may be a convincing alternative to traditional clay bricks. The quantity of clay used in brick manufacturing can be reduced by infusing glass wool into the bricks.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":"42 1","pages":"294 - 309"},"PeriodicalIF":1.1,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72785415","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 : 2023-03-27DOI: 10.1080/13287982.2023.2190648
Longyu Cai, W. Zhang, Z. Long, Zhengcai Liu
ABSTRACT Corrosion wastage is a significant factor that leads to load bearing capacity degradation of cable steel wire (CSW) structures. This paper aims to study the influence of pitting corrosion parameters on residual fatigue life (RFL) of a steel cable, so as to fit a series of formulas to predict the RFL of steel cables directly and quickly. Firstly, single and double pitting corroded CSWs are modelled by FEM. Secondly, stress concentration factors (SCFs) and residual fatigue lives (RFLs) of the corroded CSWs are calculated. Finally, calculation formulas of SCFs and RFLs of the CSWs with various pit depths and widths are fitted. The results show that SCF increases with the increase of pit depth and decreases with the increase of pit width. RFL decreases with the increase of pit depth and increases with the increase of pit width. SCF and RFL have nothing to do with the amount of corrosion pits, but only affected by the depth of the deepest pit.
{"title":"Influence of pitting corrosion parameters on the residual fatigue life of a steel cable","authors":"Longyu Cai, W. Zhang, Z. Long, Zhengcai Liu","doi":"10.1080/13287982.2023.2190648","DOIUrl":"https://doi.org/10.1080/13287982.2023.2190648","url":null,"abstract":"ABSTRACT Corrosion wastage is a significant factor that leads to load bearing capacity degradation of cable steel wire (CSW) structures. This paper aims to study the influence of pitting corrosion parameters on residual fatigue life (RFL) of a steel cable, so as to fit a series of formulas to predict the RFL of steel cables directly and quickly. Firstly, single and double pitting corroded CSWs are modelled by FEM. Secondly, stress concentration factors (SCFs) and residual fatigue lives (RFLs) of the corroded CSWs are calculated. Finally, calculation formulas of SCFs and RFLs of the CSWs with various pit depths and widths are fitted. The results show that SCF increases with the increase of pit depth and decreases with the increase of pit width. RFL decreases with the increase of pit depth and increases with the increase of pit width. SCF and RFL have nothing to do with the amount of corrosion pits, but only affected by the depth of the deepest pit.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":"34 1","pages":"310 - 323"},"PeriodicalIF":1.1,"publicationDate":"2023-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88428266","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 : 2023-02-21DOI: 10.1080/13287982.2023.2176972
Amirhesam Taghipour, J. Zakeri, M. Jahangiri, S. Mosayebi
ABSTRACT Full service without defects of railway bridges is more important than highway bridges because failure at a part of the bridge results in the blockage of the entire track and the stopping of the trains. In recent years, the problem of an over-height vehicle collision to the bridge superstructure has occurred more frequently. These collisions damage the bridge superstructure and affect the safety of the train causing many problems in railway transportation. In this study, first, a model of the concrete girder bridge was used to validate the effect of the collision load applied to the bottom of the concrete girder bridge. Then, the dynamic responses of the railway bridge simulated as concrete girders and bridge deck also track including rail, sleeper, and ballast are presented by using the finite element method. Finally, the different sensitivity analyses express that changing the bridge span length, and the value of collision loads affect the concrete girder lateral displacement at the contact area. The results show that the lateral displacements decrease with increasing the span length. Additionally, by increasing the collision forces due to increasing the velocity of the impacting object, the lateral displacement at the bottom of the girder reduces.
{"title":"Investigating the dynamic behaviour of a railway bridge subjected to over-height vehicle collision","authors":"Amirhesam Taghipour, J. Zakeri, M. Jahangiri, S. Mosayebi","doi":"10.1080/13287982.2023.2176972","DOIUrl":"https://doi.org/10.1080/13287982.2023.2176972","url":null,"abstract":"ABSTRACT Full service without defects of railway bridges is more important than highway bridges because failure at a part of the bridge results in the blockage of the entire track and the stopping of the trains. In recent years, the problem of an over-height vehicle collision to the bridge superstructure has occurred more frequently. These collisions damage the bridge superstructure and affect the safety of the train causing many problems in railway transportation. In this study, first, a model of the concrete girder bridge was used to validate the effect of the collision load applied to the bottom of the concrete girder bridge. Then, the dynamic responses of the railway bridge simulated as concrete girders and bridge deck also track including rail, sleeper, and ballast are presented by using the finite element method. Finally, the different sensitivity analyses express that changing the bridge span length, and the value of collision loads affect the concrete girder lateral displacement at the contact area. The results show that the lateral displacements decrease with increasing the span length. Additionally, by increasing the collision forces due to increasing the velocity of the impacting object, the lateral displacement at the bottom of the girder reduces.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":"135 1","pages":"217 - 227"},"PeriodicalIF":1.1,"publicationDate":"2023-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85363663","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 : 2023-02-19DOI: 10.1080/13287982.2023.2176025
L. Haj Najafi, H. Rajabi
ABSTRACT This study investigates the effect of redundancy incorporation as static indeterminacy and possibility to utilise alternative load paths in design and seismic behaviour of steel truss bridge conveyors by conducting complementary reliability assessments. The results could be supportive in adjusting the degree of indeterminacy, especially for long structures, to convince the design goals. It is conceived that the design approach with lower indeterminacy donates to less structural weight in addition to a bit more fundamental period contributing to less earthquake-induced demands and easily controllable lateral drifts in the end reference points which are very crucial in view of connecting to the adjacent structures. On the other hand, providing more indeterminacy in conveyor design could bring about more ductility, nonlinear displacement and earthquake energy dissipation as well as closer nonlinear behavioural parameters to the amounts recommended by the design code. In reliability assessments by increasing the degree of indeterminacy, the failure probability is reduced which contributes to the design with higher reliability indexes and higher collapse safety margin and it is expected that the incorporation of redundancy effects would be more perceivable by providing models with more redundancy discrepancy.
{"title":"Reliability interpretation of redundancy on design and seismic behaviour of steel conveyors","authors":"L. Haj Najafi, H. Rajabi","doi":"10.1080/13287982.2023.2176025","DOIUrl":"https://doi.org/10.1080/13287982.2023.2176025","url":null,"abstract":"ABSTRACT This study investigates the effect of redundancy incorporation as static indeterminacy and possibility to utilise alternative load paths in design and seismic behaviour of steel truss bridge conveyors by conducting complementary reliability assessments. The results could be supportive in adjusting the degree of indeterminacy, especially for long structures, to convince the design goals. It is conceived that the design approach with lower indeterminacy donates to less structural weight in addition to a bit more fundamental period contributing to less earthquake-induced demands and easily controllable lateral drifts in the end reference points which are very crucial in view of connecting to the adjacent structures. On the other hand, providing more indeterminacy in conveyor design could bring about more ductility, nonlinear displacement and earthquake energy dissipation as well as closer nonlinear behavioural parameters to the amounts recommended by the design code. In reliability assessments by increasing the degree of indeterminacy, the failure probability is reduced which contributes to the design with higher reliability indexes and higher collapse safety margin and it is expected that the incorporation of redundancy effects would be more perceivable by providing models with more redundancy discrepancy.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":"64 1","pages":"324 - 341"},"PeriodicalIF":1.1,"publicationDate":"2023-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90897306","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 : 2023-02-17DOI: 10.1080/13287982.2023.2173868
Andrea Isfeld, M. Stewart, M. Masia
ABSTRACT This paper focuses on a structural reliability-based assessment of clay brick unreinforced masonry (URM) walls subjected to uniformly distributed out-of-plane loads in one-way vertical bending. Stochastic models combining finite element analysis (FEA) and Monte Carlo simulations (MCS) are used to account for spatial variability of the flexural tensile bond strength when estimating the wall failure loads. The strength of URM walls is known to be influenced by the flexural tensile bond strength, which is subject to high spatial variability as batching, workmanship, and environmental exposure alter the strength of this bond. For this assessment, single skin walls have been considered with bond strength statistics seen in typical construction. The model error statistics available for similar walls are combined with the results of the spatial stochastic FEA and probabilistic load models to determine the reliability index corresponding to the Australian Standard for Masonry Structures AS 3700 design of members in vertical bending. It was found that existing levels of reliability exceed target reliabilities, and the capacity reduction factor can be increased from 0.60 to 0.65 for URM walls in one-way vertical bending while still providing an acceptable level of reliability. A sensitivity analysis showed this finding to be robust.
{"title":"Structural reliability and partial safety factor assessment of unreinforced masonry in vertical bending","authors":"Andrea Isfeld, M. Stewart, M. Masia","doi":"10.1080/13287982.2023.2173868","DOIUrl":"https://doi.org/10.1080/13287982.2023.2173868","url":null,"abstract":"ABSTRACT This paper focuses on a structural reliability-based assessment of clay brick unreinforced masonry (URM) walls subjected to uniformly distributed out-of-plane loads in one-way vertical bending. Stochastic models combining finite element analysis (FEA) and Monte Carlo simulations (MCS) are used to account for spatial variability of the flexural tensile bond strength when estimating the wall failure loads. The strength of URM walls is known to be influenced by the flexural tensile bond strength, which is subject to high spatial variability as batching, workmanship, and environmental exposure alter the strength of this bond. For this assessment, single skin walls have been considered with bond strength statistics seen in typical construction. The model error statistics available for similar walls are combined with the results of the spatial stochastic FEA and probabilistic load models to determine the reliability index corresponding to the Australian Standard for Masonry Structures AS 3700 design of members in vertical bending. It was found that existing levels of reliability exceed target reliabilities, and the capacity reduction factor can be increased from 0.60 to 0.65 for URM walls in one-way vertical bending while still providing an acceptable level of reliability. A sensitivity analysis showed this finding to be robust.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":"117 1","pages":"191 - 205"},"PeriodicalIF":1.1,"publicationDate":"2023-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75756575","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 : 2023-01-17DOI: 10.1080/13287982.2023.2167644
B. Pushpakumara, Ttd Silva
ABSTRACT Steel slag is a melted by-product that mainly consists of calcium carbonate and metal oxides generated in the process of steel manufacturing. The main objectives of this study are to evaluate the effectiveness of steel slags as fine and coarse aggregates in concrete and to determine the optimum quantity of steel slag as fine and coarse aggregates to enhance the strength of concrete. Concrete cubes were cast by mixing steel slag as replacement (i.e. 0%, 10%, 25%, 50%, 75% and 100%) for fine and coarse aggregate, separately. Abrasion test, sieve analysis, water absorption and specific gravity test were conducted to determine the properties of raw materials. Unit weight, workability, compressive strength, splitting tensile strength and the possibility of corrosion were experimentally evaluated to determine the effectiveness of steel slag. It is found that 75% steel slag mixed concrete indicates improvements in compressive strength, splitting tensile strength and unit weight, respectively. Further, it was noted that steel slag aggregates were not corroded after conducting the Accelerated Corrosion Test Method (ACTM). Therefore, the use of steel slag as fine and coarse aggregates for concrete would improve the mechanical properties of concrete and reduce the adverse environmental impact.
{"title":"Evaluation of mechanical properties of steel slag as replacement for fine and coarse aggregate in concrete","authors":"B. Pushpakumara, Ttd Silva","doi":"10.1080/13287982.2023.2167644","DOIUrl":"https://doi.org/10.1080/13287982.2023.2167644","url":null,"abstract":"ABSTRACT Steel slag is a melted by-product that mainly consists of calcium carbonate and metal oxides generated in the process of steel manufacturing. The main objectives of this study are to evaluate the effectiveness of steel slags as fine and coarse aggregates in concrete and to determine the optimum quantity of steel slag as fine and coarse aggregates to enhance the strength of concrete. Concrete cubes were cast by mixing steel slag as replacement (i.e. 0%, 10%, 25%, 50%, 75% and 100%) for fine and coarse aggregate, separately. Abrasion test, sieve analysis, water absorption and specific gravity test were conducted to determine the properties of raw materials. Unit weight, workability, compressive strength, splitting tensile strength and the possibility of corrosion were experimentally evaluated to determine the effectiveness of steel slag. It is found that 75% steel slag mixed concrete indicates improvements in compressive strength, splitting tensile strength and unit weight, respectively. Further, it was noted that steel slag aggregates were not corroded after conducting the Accelerated Corrosion Test Method (ACTM). Therefore, the use of steel slag as fine and coarse aggregates for concrete would improve the mechanical properties of concrete and reduce the adverse environmental impact.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":"1 1","pages":"254 - 263"},"PeriodicalIF":1.1,"publicationDate":"2023-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89657971","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 : 2022-12-12DOI: 10.1080/13287982.2022.2156167
M. Rakib, Abu Zakir Morshed
ABSTRACT A design guideline for shear strengthening of pre-cracked reinforced concrete (RC) beams using steel plates has been presented in this research by modifying the available shear capacity formulas. An experimental investigation was also carried out in order to validate the proposed guideline. Total five RC beams were fabricated, among which four beams were pre-cracked in shear by applying preloads. Two of the cracked beams were then strengthened with adhesive bonded steel plates while the rest two were strengthened with bolted steel plates. Variation was made in plate depth and bolt layers. The shear performance of the strengthened beams was evaluated by testing the beams to their ultimate capacity. Experimental results indicated that the shear capacity, ductility and stiffness of the pre-cracked beams increased significantly after strengthening with continuous steel plates. The shear capacity varied from 131% to 201% for strengthened beams compared to the control beam. Deeper plates offered better shear performance than the shallower plates. Modification of the existing formulas by introducing preload factors for estimating the shear capacity of the strengthened beams showed a good agreement with the experimental shear capacity.
{"title":"Shear strengthening design of pre-cracked reinforced concrete beams using bonded and bolted steel plates","authors":"M. Rakib, Abu Zakir Morshed","doi":"10.1080/13287982.2022.2156167","DOIUrl":"https://doi.org/10.1080/13287982.2022.2156167","url":null,"abstract":"ABSTRACT A design guideline for shear strengthening of pre-cracked reinforced concrete (RC) beams using steel plates has been presented in this research by modifying the available shear capacity formulas. An experimental investigation was also carried out in order to validate the proposed guideline. Total five RC beams were fabricated, among which four beams were pre-cracked in shear by applying preloads. Two of the cracked beams were then strengthened with adhesive bonded steel plates while the rest two were strengthened with bolted steel plates. Variation was made in plate depth and bolt layers. The shear performance of the strengthened beams was evaluated by testing the beams to their ultimate capacity. Experimental results indicated that the shear capacity, ductility and stiffness of the pre-cracked beams increased significantly after strengthening with continuous steel plates. The shear capacity varied from 131% to 201% for strengthened beams compared to the control beam. Deeper plates offered better shear performance than the shallower plates. Modification of the existing formulas by introducing preload factors for estimating the shear capacity of the strengthened beams showed a good agreement with the experimental shear capacity.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":"19 1","pages":"159 - 172"},"PeriodicalIF":1.1,"publicationDate":"2022-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74286776","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 : 2022-11-27DOI: 10.1080/13287982.2022.2149975
Amir Pourtarki, H. Badri Ghavifekr, H. Afshin
ABSTRACT This paper uses the vibration-based damage detection method for structural health monitoring of a Railway Bridge. Hence, the bridge had been exactly modelled in finite element analysis software. Due to the elastomeric bridge bearing, direct calculating of the natural frequencies and extracting the mode shapes of the bridge is not suitable and effective. Therefore, a time-dependent transient analysis of the train movement on the bridge is done and then the vibrations of all truss cells during the train crossing period were extracted. Afterwards, the relevant data is transformed, which represents the natural frequencies of the bridge vibration and their amplitude at each point. In the following, the mode shapes of vibration and the distribution of vibration energy are calculated. Applying any artificial damages in the model, occurring changes in the natural frequencies, mode shapes, and the vibration energies of the modes, are examined. Consequently, detecting and locating damages in the structure has been done with acceptable accuracy. Finally, for validation of the results, an accelerometer is installed on the bridge truss in the middle part of the bridge to extract the acceleration of bridge vibration at the train crossing time interval. In the end, the results are compared and presented.
{"title":"Study on the dynamic behaviour of Bafgh-Bandar Abbas lane railway bridge for structural health monitoring purpose","authors":"Amir Pourtarki, H. Badri Ghavifekr, H. Afshin","doi":"10.1080/13287982.2022.2149975","DOIUrl":"https://doi.org/10.1080/13287982.2022.2149975","url":null,"abstract":"ABSTRACT This paper uses the vibration-based damage detection method for structural health monitoring of a Railway Bridge. Hence, the bridge had been exactly modelled in finite element analysis software. Due to the elastomeric bridge bearing, direct calculating of the natural frequencies and extracting the mode shapes of the bridge is not suitable and effective. Therefore, a time-dependent transient analysis of the train movement on the bridge is done and then the vibrations of all truss cells during the train crossing period were extracted. Afterwards, the relevant data is transformed, which represents the natural frequencies of the bridge vibration and their amplitude at each point. In the following, the mode shapes of vibration and the distribution of vibration energy are calculated. Applying any artificial damages in the model, occurring changes in the natural frequencies, mode shapes, and the vibration energies of the modes, are examined. Consequently, detecting and locating damages in the structure has been done with acceptable accuracy. Finally, for validation of the results, an accelerometer is installed on the bridge truss in the middle part of the bridge to extract the acceleration of bridge vibration at the train crossing time interval. In the end, the results are compared and presented.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":"19 1","pages":"243 - 253"},"PeriodicalIF":1.1,"publicationDate":"2022-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90066601","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 : 2022-11-25DOI: 10.1080/13287982.2022.2149914
Hrishikesh N. Shedge, Manoj Kumar
ABSTRACT The substructure of an integral abutment bridge is designed to accommodate the lateral demand induced by the expansion and contraction of the bridge deck. The assembly of H-piles oriented about their weak axis of bending and aligned in a single row with a rigid connection to the abutment is most preferred for supporting the integral abutment bridges. The weak axis orientation of H-pile allows for higher displacement capacity, thus accommodating the cyclic thermal demand induced by a superstructure. The hysteretic response of H-piles is suggestive of the early onset of the plastic hinge formation, which helps in accommodating the cyclic demand. The H-piles in the integral abutment bridge experience low cycle fatigue induced by cyclic thermal variations, resulting in the buckling of flanges at the critical zone. This study assesses the impact of perforation made on H-pile flanges at the critical buckling zone. In this study, six unique geometries of perforations are modelled and analysed using combined nonlinear kinematic and isotropic hardening formulation. The hysteretic response of the perforated H-pile models has been compared with an unperforated model to assess the proposed perforation geometry's impact on the H-pile's hysteretic response.
{"title":"Response of perforated H-pile subjected to coupled lateral displacement history and axial loading","authors":"Hrishikesh N. Shedge, Manoj Kumar","doi":"10.1080/13287982.2022.2149914","DOIUrl":"https://doi.org/10.1080/13287982.2022.2149914","url":null,"abstract":"ABSTRACT The substructure of an integral abutment bridge is designed to accommodate the lateral demand induced by the expansion and contraction of the bridge deck. The assembly of H-piles oriented about their weak axis of bending and aligned in a single row with a rigid connection to the abutment is most preferred for supporting the integral abutment bridges. The weak axis orientation of H-pile allows for higher displacement capacity, thus accommodating the cyclic thermal demand induced by a superstructure. The hysteretic response of H-piles is suggestive of the early onset of the plastic hinge formation, which helps in accommodating the cyclic demand. The H-piles in the integral abutment bridge experience low cycle fatigue induced by cyclic thermal variations, resulting in the buckling of flanges at the critical zone. This study assesses the impact of perforation made on H-pile flanges at the critical buckling zone. In this study, six unique geometries of perforations are modelled and analysed using combined nonlinear kinematic and isotropic hardening formulation. The hysteretic response of the perforated H-pile models has been compared with an unperforated model to assess the proposed perforation geometry's impact on the H-pile's hysteretic response.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":"6 1","pages":"149 - 158"},"PeriodicalIF":1.1,"publicationDate":"2022-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81903510","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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