To study the behavior and design of tubed circular steel reinforced concrete (TCSRC) short column under axial compressive loads, a nonlinear finite element model (FEM) has been developed to simulate this kind of struc...To study the behavior and design of tubed circular steel reinforced concrete (TCSRC) short column under axial compressive loads, a nonlinear finite element model (FEM) has been developed to simulate this kind of structure. Depending on the FEM results, an elastic-plastic analysis was carried out to clarify the status of steel tube, then a simplified procedure was proposed to predict the compressive axial load strength. The results obtained from this procedure were compared with the test results. It is found that they agree well each other.展开更多
In this study,innovative Lightweight Self-compacting Geopolymer concrete made of industrial and agricultural wastes is developed and used as the in-fill material in Fiber Reinforced Polymer(FRP)composite columns.The a...In this study,innovative Lightweight Self-compacting Geopolymer concrete made of industrial and agricultural wastes is developed and used as the in-fill material in Fiber Reinforced Polymer(FRP)composite columns.The axial compressive performance of the columns is investigated with critical parameter variations such as the effect of the Diameter to thickness(D/t)ratio and fiber orientation of the FRP tube.Two types of D/t ratios,i.e.,30 and 50,and three fiber orientations±0°,±30°,and±45°were used for the key parameter variations.An increased D/t ratio from 30 to 50 reduces the performance in terms of load despite increasing the deformation.The columns containing the fiber orientation of±0°exhibit greater performance compared to other types of fiber orientation(±30°and±45°).The experimental results and failure patterns were compared and validated against the numerical and theoretical studies.A Finite Element model is developed and validated with the experimental results with errors ranging from 0.84%to 4.57%.The experimental results were validated against various existing theoretical prediction models with a percentage error of 7%to 14%An improved theoretical model is proposed for predicting the axial load of concrete-filled FRP composite columns.展开更多
With the increasing demand in ocean engineering field for the ultimate limit state(ULS)analysis of thick plates,the solid(3D)element has been more frequently used in the ULS analysis.Compared to 2D element,3D element ...With the increasing demand in ocean engineering field for the ultimate limit state(ULS)analysis of thick plates,the solid(3D)element has been more frequently used in the ULS analysis.Compared to 2D element,3D element can better consider the transverse shearing effect during the analysis which usually occurs on thick plates,due to its reliable reflection of geometrical characteristics and kinematic equations of the structures.Besides,3D element can also facilitate the introduction of influencing factors into the ULS analysis,such as the erosions,cracks and residual stress.This may improve the simulation precision of ULS analysis of thick plate models.Until now,there is a lack of 3D element modelling technique in the ULS analysis of flat/stiffened plates.The present study aims to provide helpful information on 3D elements in the ULS analysis of flat plates under axial compression load.A total of 350 plate scenarios were adopted in the parametric study to consider the effects of 3D element shape(α_(yz)).It is found that the element shape significantly influences the ULS analysis of flat plates,where planar-like 3D element is not recommended.An empirical formula for determining the optimal 3D element shape of the finite element(FE)model is proposed based on the parametric results.A guidance for implementing the 3D elements is then documented,which may help engineers further understand the ultimate strength characteristic of very thick flat plates.展开更多
基金Sponsored by the National Natural Science Foundation of China (Grant No.50708027)National Key Technology R&D Program of China(Grant No.2006BAJ01B02)
文摘To study the behavior and design of tubed circular steel reinforced concrete (TCSRC) short column under axial compressive loads, a nonlinear finite element model (FEM) has been developed to simulate this kind of structure. Depending on the FEM results, an elastic-plastic analysis was carried out to clarify the status of steel tube, then a simplified procedure was proposed to predict the compressive axial load strength. The results obtained from this procedure were compared with the test results. It is found that they agree well each other.
基金support by All India Council for Technical Education(AICTE)under Research Promotion Scheme,File No.8232/RIFD/RPS(POLICY-1)/2018-19.
文摘In this study,innovative Lightweight Self-compacting Geopolymer concrete made of industrial and agricultural wastes is developed and used as the in-fill material in Fiber Reinforced Polymer(FRP)composite columns.The axial compressive performance of the columns is investigated with critical parameter variations such as the effect of the Diameter to thickness(D/t)ratio and fiber orientation of the FRP tube.Two types of D/t ratios,i.e.,30 and 50,and three fiber orientations±0°,±30°,and±45°were used for the key parameter variations.An increased D/t ratio from 30 to 50 reduces the performance in terms of load despite increasing the deformation.The columns containing the fiber orientation of±0°exhibit greater performance compared to other types of fiber orientation(±30°and±45°).The experimental results and failure patterns were compared and validated against the numerical and theoretical studies.A Finite Element model is developed and validated with the experimental results with errors ranging from 0.84%to 4.57%.The experimental results were validated against various existing theoretical prediction models with a percentage error of 7%to 14%An improved theoretical model is proposed for predicting the axial load of concrete-filled FRP composite columns.
基金supported by Brain Pool program funded by the Ministry of Science and ICT through the National Research Foundation of Korea(NRF-2021H1D3A2A02094658)the Basic Science Research Program(NRF-2022R1F1A1065425)support by China government and China scholarship council(CSC NO.202206950035)for this collaborative research.
文摘With the increasing demand in ocean engineering field for the ultimate limit state(ULS)analysis of thick plates,the solid(3D)element has been more frequently used in the ULS analysis.Compared to 2D element,3D element can better consider the transverse shearing effect during the analysis which usually occurs on thick plates,due to its reliable reflection of geometrical characteristics and kinematic equations of the structures.Besides,3D element can also facilitate the introduction of influencing factors into the ULS analysis,such as the erosions,cracks and residual stress.This may improve the simulation precision of ULS analysis of thick plate models.Until now,there is a lack of 3D element modelling technique in the ULS analysis of flat/stiffened plates.The present study aims to provide helpful information on 3D elements in the ULS analysis of flat plates under axial compression load.A total of 350 plate scenarios were adopted in the parametric study to consider the effects of 3D element shape(α_(yz)).It is found that the element shape significantly influences the ULS analysis of flat plates,where planar-like 3D element is not recommended.An empirical formula for determining the optimal 3D element shape of the finite element(FE)model is proposed based on the parametric results.A guidance for implementing the 3D elements is then documented,which may help engineers further understand the ultimate strength characteristic of very thick flat plates.
