Pub Date : 2023-06-01DOI: 10.59382/j-ibst.2023.vi.vol2-5
Van Loi Giap, Tuan Anh Pham, Tuong Lai Nguyen
Bearing capacity is one of the most important parameters when designing piles. However, determining the exact bearing capacity of piles is a difficult job due to the influence of many parameters. The traditional methods of calculating the axial load capacity of piles all use a predefined problem, that is, determining only a single load capacity value, which is not entirely consistent with the actual working of the piles, where the input parameters affecting the bearing capacity of the piles are random. In this study, an advanced machine learning model based on artificial intelligence, the Random Forest, was developed and applied to predict the bearing capacity of piles. This model is used as a predefined model applied in the Monte-Carlo simulation method to determine the reliability of the pile-bearing capacity. The results show that the Random Forest model very well predicts the bearing capacity of piles on both training and testing data. In addition, the Monte-Carlo simulation results with random soil data show that there is still the possibility of unsafe pile operation even when the pile top load is lower than the expected average bearing capacity of the pile. Furthermore, the maximum load to the top of the pile should not exceed 99.2% of the mean load value, to achieve a high probability of safe working, on this data set.
{"title":"Research on determining the piles bearing capacity using a random forest model considering the randomness of the soil data","authors":"Van Loi Giap, Tuan Anh Pham, Tuong Lai Nguyen","doi":"10.59382/j-ibst.2023.vi.vol2-5","DOIUrl":"https://doi.org/10.59382/j-ibst.2023.vi.vol2-5","url":null,"abstract":"Bearing capacity is one of the most important parameters when designing piles. However, determining the exact bearing capacity of piles is a difficult job due to the influence of many parameters. The traditional methods of calculating the axial load capacity of piles all use a predefined problem, that is, determining only a single load capacity value, which is not entirely consistent with the actual working of the piles, where the input parameters affecting the bearing capacity of the piles are random. In this study, an advanced machine learning model based on artificial intelligence, the Random Forest, was developed and applied to predict the bearing capacity of piles. This model is used as a predefined model applied in the Monte-Carlo simulation method to determine the reliability of the pile-bearing capacity. The results show that the Random Forest model very well predicts the bearing capacity of piles on both training and testing data. In addition, the Monte-Carlo simulation results with random soil data show that there is still the possibility of unsafe pile operation even when the pile top load is lower than the expected average bearing capacity of the pile. Furthermore, the maximum load to the top of the pile should not exceed 99.2% of the mean load value, to achieve a high probability of safe working, on this data set.","PeriodicalId":350876,"journal":{"name":"Vietnam Institute for Building Science and Technology","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132115531","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 : 2023-06-01DOI: 10.59382/j-ibst.2023.vi.vol2-1
Truong-Thang Nguyen, Tuan Trung Nguyen, V. Dang
Since 2018, it has been planned by the Vietnamese authorities for the preparation of a new system of the national construction codes and standards, of which the Eurocodes were recently taken into consideration to be systematically and gradually applied during the period from 2022 to 2030. Towards this orientation, significant attentions have also been paid and various number of studies on design of concrete structures to the Eurocodes have been conducted by Vietnamese researchers, which will be introduced in this paper to prepare for the comprehensive applications of the Eurocodes for concrete structures in Vietnam in the coming time when appropriable, especially the second generation of the Eurocodes will be expected to be also issued in coming years.
{"title":"The eurocodes - research and application for concrete structures in Vietnam context","authors":"Truong-Thang Nguyen, Tuan Trung Nguyen, V. Dang","doi":"10.59382/j-ibst.2023.vi.vol2-1","DOIUrl":"https://doi.org/10.59382/j-ibst.2023.vi.vol2-1","url":null,"abstract":"Since 2018, it has been planned by the Vietnamese authorities for the preparation of a new system of the national construction codes and standards, of which the Eurocodes were recently taken into consideration to be systematically and gradually applied during the period from 2022 to 2030. Towards this orientation, significant attentions have also been paid and various number of studies on design of concrete structures to the Eurocodes have been conducted by Vietnamese researchers, which will be introduced in this paper to prepare for the comprehensive applications of the Eurocodes for concrete structures in Vietnam in the coming time when appropriable, especially the second generation of the Eurocodes will be expected to be also issued in coming years.","PeriodicalId":350876,"journal":{"name":"Vietnam Institute for Building Science and Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129987266","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 : 2023-06-01DOI: 10.59382/j-ibst.2023.vi.vol2-7
Mạnh Tùng Võ, Quốc Định Phùng
When designing seismic resistance for reinforced concrete buildings with medium ductility class (DCM) according to TCVN 9386:2012 the load bearing structures are to be designed to meet the required ductilities. The design of ductile members is quite complicated [2] and the amount of reinforcement provided for seismic members is considerable. Even so, TCVN 9386:2012 also allows to ignore the contribution of some members to the global seismic load-bearing structural system (that are secondary seismic members) when the remaining members (primary seismic members) are sufficient to ensure the safety and stability of the building. This paper presents some basic principles of the selection, the modeling methods and the design principles of primary and secondary seismic members in reinforced concrete buildings.
{"title":"Thiết kế nhà bê tông cốt thép chịu động đất có phân loại kết cấu kháng chấn chính và phụ theo TCVN 9386:2012","authors":"Mạnh Tùng Võ, Quốc Định Phùng","doi":"10.59382/j-ibst.2023.vi.vol2-7","DOIUrl":"https://doi.org/10.59382/j-ibst.2023.vi.vol2-7","url":null,"abstract":"When designing seismic resistance for reinforced concrete buildings with medium ductility class (DCM) according to TCVN 9386:2012 the load bearing structures are to be designed to meet the required ductilities. The design of ductile members is quite complicated [2] and the amount of reinforcement provided for seismic members is considerable. Even so, TCVN 9386:2012 also allows to ignore the contribution of some members to the global seismic load-bearing structural system (that are secondary seismic members) when the remaining members (primary seismic members) are sufficient to ensure the safety and stability of the building. This paper presents some basic principles of the selection, the modeling methods and the design principles of primary and secondary seismic members in reinforced concrete buildings.","PeriodicalId":350876,"journal":{"name":"Vietnam Institute for Building Science and Technology","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122681308","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 : 2023-06-01DOI: 10.59382/j-ibst.2023.vi.vol2-3
Dinh Tho Vu, Tuan Anh Pham
In construction practice, reinforced concrete structures are designed to meet the requirements of not only the load-bearing capacity but also the abilities of sound insulation, heat insulation, fire resistance, etc. A promising and effective solution to meet these requirements is using multi-layer reinforced concrete structures with an internal layer by low thermal conductivity concrete, and external layers by traditional concrete, high-strength concrete, or kezamzit concrete. The different physical-mechanical properties of the material layers affect the structure's performance under load. In this study, the authors have introduced a theoretical method to calculate and analyze the stress-strain states of flexural reinforced concrete structures with cross-sectional sections consisting of layers from different concrete materials under the effect of load. The study's results have shown that in the manufacturing process of multi-layer reinforced concrete structures by different concretes, a contact zone is formed between layers because of aggregate components from different types of concrete. Calculated results by using the proposed model have shown that the values of the moment and deflection of the beam when cracks begin to appear and when the beam is damaged, are closer to the experimental results than by using the previous models. The research results are useful references for the calculation of multi-layer reinforced concrete structures with a middle layer from lightweight concrete.
{"title":"A method for calculating flexural multi-layer reinforced concrete structures","authors":"Dinh Tho Vu, Tuan Anh Pham","doi":"10.59382/j-ibst.2023.vi.vol2-3","DOIUrl":"https://doi.org/10.59382/j-ibst.2023.vi.vol2-3","url":null,"abstract":"In construction practice, reinforced concrete structures are designed to meet the requirements of not only the load-bearing capacity but also the abilities of sound insulation, heat insulation, fire resistance, etc. A promising and effective solution to meet these requirements is using multi-layer reinforced concrete structures with an internal layer by low thermal conductivity concrete, and external layers by traditional concrete, high-strength concrete, or kezamzit concrete. The different physical-mechanical properties of the material layers affect the structure's performance under load. In this study, the authors have introduced a theoretical method to calculate and analyze the stress-strain states of flexural reinforced concrete structures with cross-sectional sections consisting of layers from different concrete materials under the effect of load. The study's results have shown that in the manufacturing process of multi-layer reinforced concrete structures by different concretes, a contact zone is formed between layers because of aggregate components from different types of concrete. Calculated results by using the proposed model have shown that the values of the moment and deflection of the beam when cracks begin to appear and when the beam is damaged, are closer to the experimental results than by using the previous models. The research results are useful references for the calculation of multi-layer reinforced concrete structures with a middle layer from lightweight concrete.","PeriodicalId":350876,"journal":{"name":"Vietnam Institute for Building Science and Technology","volume":"373 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115851342","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 : 2023-06-01DOI: 10.59382/j-ibst.2023.vi.vol2-2
Trọng Hữu Ngô
This paper presents the process of developing a practical formula for predicting the ultimate bending moment of rectangular reinforced concrete (RC) beams through regression analysis. The data used for regression analysis was generated by using the fiber method to analyze a non-linear batch of commonly encountered RC beam cross-sections. The practical formula was obtained by fitting a linear regression model to the training set and then making predictions on the test set. The coefficient of determination, R2, between the bending moment values calculated from the formula and the results of the non-linear analysis was 0.9948, indicating a good predictive capability of the formula.
{"title":"Dự đoán khả năng chịu uốn của tiết diện dầm bê tông cốt thép bằng công thức thực hành","authors":"Trọng Hữu Ngô","doi":"10.59382/j-ibst.2023.vi.vol2-2","DOIUrl":"https://doi.org/10.59382/j-ibst.2023.vi.vol2-2","url":null,"abstract":"This paper presents the process of developing a practical formula for predicting the ultimate bending moment of rectangular reinforced concrete (RC) beams through regression analysis. The data used for regression analysis was generated by using the fiber method to analyze a non-linear batch of commonly encountered RC beam cross-sections. The practical formula was obtained by fitting a linear regression model to the training set and then making predictions on the test set. The coefficient of determination, R2, between the bending moment values calculated from the formula and the results of the non-linear analysis was 0.9948, indicating a good predictive capability of the formula.","PeriodicalId":350876,"journal":{"name":"Vietnam Institute for Building Science and Technology","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121255499","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 : 2023-06-01DOI: 10.59382/j-ibst.2023.vi.vol2-4
Quang Phú Nguyễn
Using a mixture of cement combined with additives including (fly ash, blast furnace slag and magnesium oxide) to harden dredged silt as a substitute for sand is necessary in construction areas where sand resources are scarce nature. In the study, the mixtures (cement + fly ash + ground blast furnance slag + magnesium oxide) were used to harden mud in brackish and salt water areas in Ca Mau province of the Mekong Delta. The experimental results show that when hardening dredged sludge with content of 6% Cement combined with a mixture of ground blast furnace slag, fly ash and MgO, the viscosity, internal friction angle, adhesive force and compressive strength of the mixture sludge solidification will improve. The higher the ratio of MgO content, the lower the viscosity; the greater the internal friction angle, adhesive force and compressive strength of the hardened sludge. However, in order to balance the design requirements of the sludge after hardening, it was found that: With the rate of 4% fly ash, 2% ground blast furnace slag and 0.5% MgO, the design requirements were met, the quality of the dredging soil after hardening meets the requirements according to TCVN 8217:2009, equivalent to the hard plastic state (0.25 < IL < 0.5, Ctc = 32÷57 kPa and = 11 ÷ 18°). With such hardening mud quality, it will meet the requirement of replacing sand for embankment, embankment and other works in Ca Mau in particular, and the whole Mekong Delta in general.
{"title":"Nghiên cứu ảnh hưởng của hàm lượng xi măng và magiê oxyt đến một số tính chất của đất bùn cứng hóa tại tỉnh Cà Mau","authors":"Quang Phú Nguyễn","doi":"10.59382/j-ibst.2023.vi.vol2-4","DOIUrl":"https://doi.org/10.59382/j-ibst.2023.vi.vol2-4","url":null,"abstract":"Using a mixture of cement combined with additives including (fly ash, blast furnace slag and magnesium oxide) to harden dredged silt as a substitute for sand is necessary in construction areas where sand resources are scarce nature. In the study, the mixtures (cement + fly ash + ground blast furnance slag + magnesium oxide) were used to harden mud in brackish and salt water areas in Ca Mau province of the Mekong Delta. The experimental results show that when hardening dredged sludge with content of 6% Cement combined with a mixture of ground blast furnace slag, fly ash and MgO, the viscosity, internal friction angle, adhesive force and compressive strength of the mixture sludge solidification will improve. The higher the ratio of MgO content, the lower the viscosity; the greater the internal friction angle, adhesive force and compressive strength of the hardened sludge. However, in order to balance the design requirements of the sludge after hardening, it was found that: With the rate of 4% fly ash, 2% ground blast furnace slag and 0.5% MgO, the design requirements were met, the quality of the dredging soil after hardening meets the requirements according to TCVN 8217:2009, equivalent to the hard plastic state (0.25 < IL < 0.5, Ctc = 32÷57 kPa and = 11 ÷ 18°). With such hardening mud quality, it will meet the requirement of replacing sand for embankment, embankment and other works in Ca Mau in particular, and the whole Mekong Delta in general.","PeriodicalId":350876,"journal":{"name":"Vietnam Institute for Building Science and Technology","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130955825","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 : 2023-06-01DOI: 10.59382/j-ibst.2023.vi.vol2-6
Ngọc Thắng Nguyễn, Văn Thịnh
Diaphragm wall deflection is considered one of the reasons for soil instability around excavation, causing serious consequences for neighboring constructions. Therefore, in the design and calculation of deep excavation, analyzing and simulating the diaphragm wall deflection between phases of excavation construction becomes very important. However, selecting an appropriate mathematical model and determining its input parameters affect the accuracy of the calculation results and their deviation from reality. In this article, the Hardening Soil (HS) model and the Mohr Coulomb (MC) model were used to simulate deflection calculations of diaphragm wall using Plaxis 3D and compared with data obtained from a real project in Ho Chi Minh City. The results showed that the stiffness parameter Eref50 was taken according to the formula Eref50 = 1000N for sandy soil (N: number of SPT blows), Eref50 = 500Su for cohesive soil (Su: undrained soil resistance) in the HS model, resulting in analysis of deflection that was quite compatible with actual data. In addition, the deflection of diaphragm wall varied inversely with its thickness, but this change was relatively small.
{"title":"Ứng dụng mô hình nền hardening soil và mohr coulomb trong plaxis 3D mô phỏng tính toán chuyển vị tường vây","authors":"Ngọc Thắng Nguyễn, Văn Thịnh","doi":"10.59382/j-ibst.2023.vi.vol2-6","DOIUrl":"https://doi.org/10.59382/j-ibst.2023.vi.vol2-6","url":null,"abstract":"Diaphragm wall deflection is considered one of the reasons for soil instability around excavation, causing serious consequences for neighboring constructions. Therefore, in the design and calculation of deep excavation, analyzing and simulating the diaphragm wall deflection between phases of excavation construction becomes very important. However, selecting an appropriate mathematical model and determining its input parameters affect the accuracy of the calculation results and their deviation from reality. In this article, the Hardening Soil (HS) model and the Mohr Coulomb (MC) model were used to simulate deflection calculations of diaphragm wall using Plaxis 3D and compared with data obtained from a real project in Ho Chi Minh City. The results showed that the stiffness parameter Eref50 was taken according to the formula Eref50 = 1000N for sandy soil (N: number of SPT blows), Eref50 = 500Su for cohesive soil (Su: undrained soil resistance) in the HS model, resulting in analysis of deflection that was quite compatible with actual data. In addition, the deflection of diaphragm wall varied inversely with its thickness, but this change was relatively small.","PeriodicalId":350876,"journal":{"name":"Vietnam Institute for Building Science and Technology","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121678478","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 : 2023-03-01DOI: 10.59382/j-ibst.2023.en.vol1-7
Tien Thinh Do
Design standard for earthquake resistance TCVN 9386:2012, first issued and enforced in 2006 with code TCXDVN 375:2006, was reviewed and will soon be replaced by the new TCVN 9386:2023. This paper presents some notable revisions of the draft standard TCVN 9386:2023 compared to the previous one.
{"title":"New contents in the draft version of TCVN 9386:2023","authors":"Tien Thinh Do","doi":"10.59382/j-ibst.2023.en.vol1-7","DOIUrl":"https://doi.org/10.59382/j-ibst.2023.en.vol1-7","url":null,"abstract":"Design standard for earthquake resistance TCVN 9386:2012, first issued and enforced in 2006 with code TCXDVN 375:2006, was reviewed and will soon be replaced by the new TCVN 9386:2023. This paper presents some notable revisions of the draft standard TCVN 9386:2023 compared to the previous one.","PeriodicalId":350876,"journal":{"name":"Vietnam Institute for Building Science and Technology","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126976043","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 : 2023-03-01DOI: 10.59382/j-ibst.2023.en.vol1-3
Van Tuan Vu
In the past few years, the application of Machine Learning Techniques (MLT) has become a popular way to enhance the accuracy of predicting concrete properties. This study aims to compare and contrast the performance of Artificial neural network (ANN) and Decision Tree (DT) methods in predicting the compressive strength and slump values of concrete samples. Experimental data used for model building and comparison were obtained from a previous research project. R-squared value (RSQ) and Mean Squared Error (MSE) metrics were used to determine which regression method was the most efficient in predicting concrete compressive strength and slump values. The results from the comparison between ANN and DT methods would be able to identify which of the two regression models is the better choice for forecasting concrete properties.
{"title":"A comparative investigation using artificial neural network (ANN) and decision tree (DT) methods in the prediction of slump and strength for concrete samples","authors":"Van Tuan Vu","doi":"10.59382/j-ibst.2023.en.vol1-3","DOIUrl":"https://doi.org/10.59382/j-ibst.2023.en.vol1-3","url":null,"abstract":"In the past few years, the application of Machine Learning Techniques (MLT) has become a popular way to enhance the accuracy of predicting concrete properties. This study aims to compare and contrast the performance of Artificial neural network (ANN) and Decision Tree (DT) methods in predicting the compressive strength and slump values of concrete samples. Experimental data used for model building and comparison were obtained from a previous research project. R-squared value (RSQ) and Mean Squared Error (MSE) metrics were used to determine which regression method was the most efficient in predicting concrete compressive strength and slump values. The results from the comparison between ANN and DT methods would be able to identify which of the two regression models is the better choice for forecasting concrete properties.","PeriodicalId":350876,"journal":{"name":"Vietnam Institute for Building Science and Technology","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123914792","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 : 2023-03-01DOI: 10.59382/j-ibst.2023.en.vol1-5
Thanh Sang Nguyen, Tuonglai Nguyen, D. Pham
A modified direct shear tests of interface between well-graded coral sand and coral sandy-gravel with smooth steel plate were conducted in this study under various normal stress levels. The obsevation from experimental results indicates that: (1) interface shear behavior between well-graded coral soils and steel structure follows the strain hardening rules; (2) the magnitudes of friction resistances between two materials are related to the gradation and grain size of coral soils, for coral sand limit sliding displacement is around 1mm with interface friction angle of 27.9o while for coral sandy-gravel these values are 2-3mm and 32.8o respectively; (3) interface direct shear test can be used to accurately determine friction characteristics between calcareous soil and structural material, which can effectively support analysis and design of structures built on calcareous soil.
{"title":"Experimental study of interface shear characteristics between calcareous soil and steel, application to estimate axial bearing capacity of steel pile","authors":"Thanh Sang Nguyen, Tuonglai Nguyen, D. Pham","doi":"10.59382/j-ibst.2023.en.vol1-5","DOIUrl":"https://doi.org/10.59382/j-ibst.2023.en.vol1-5","url":null,"abstract":"A modified direct shear tests of interface between well-graded coral sand and coral sandy-gravel with smooth steel plate were conducted in this study under various normal stress levels. The obsevation from experimental results indicates that: (1) interface shear behavior between well-graded coral soils and steel structure follows the strain hardening rules; (2) the magnitudes of friction resistances between two materials are related to the gradation and grain size of coral soils, for coral sand limit sliding displacement is around 1mm with interface friction angle of 27.9o while for coral sandy-gravel these values are 2-3mm and 32.8o respectively; (3) interface direct shear test can be used to accurately determine friction characteristics between calcareous soil and structural material, which can effectively support analysis and design of structures built on calcareous soil.","PeriodicalId":350876,"journal":{"name":"Vietnam Institute for Building Science and Technology","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131172496","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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