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Wu Y.,Chongqing University | Zhou Z.,Chongqing University | Li L.,Chongqing University | Li Y.,China Construction Second Engineering Bureau Ltd
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2015

Considering the effects of different steel ratio of concealed steel columns and diagonal braces, seismic behavior of three 1/4 scaled low-rise high strength reinforced concrete walls with concealed steel truss, were investigated through quasi-static tests. Numerical analysis by the finite element software ABAQUS was conducted. By studying experiment phenomena, including the failure pattern, hysteresis loops, skeleton curves, displacement ductility and stiffness degradation process, it is indicated that the specimens mainly fail in flexure. The displacement ductility can be improved significantly, and the post-yield stiffness degradation is smoother compared with the normal high strength concrete low-rise shear wall without concealed steel truss, implying the effectiveness of the concealed truss. As the steel ratio of concealed braces is raised, the maximum horizontal bearing capacity is increased slightly, while the displacement ductility and hysteretic energy dissipation capacity can be improved significantly. Numerical simulation results of ABAQUS agreed well with experiment results. ©, 2015, Science Press. All right reserved. Source


Liu Y.,China Construction Second Engineering Bureau Ltd
Proceedings - 2013 5th Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2013 | Year: 2013

For some structures, the overturning behavior of a single pile foundation will be the controlling factor. This paper is to present the overturning behaviors about prismatic, belled and step tapered single piles by using the FEM method. The interaction laws between foundations and the soil were investigated. Based on these results, the antidumping countermeasures were suggested, thus to solve anti-overturning issues economically. © 2013 IEEE. Source


Qin H.-L.,China State Construction Engineering Corporation | Guo Y.-C.,Zhengzhou University | Li F.,China Construction Second Engineering Bureau Ltd
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2013

ABAQUS is a popular commercial finite element software and the clay plasticity model presented in it can perfectly simulate the stress-strain behavior of the normally consolidated clay. A three-dimensional finite model is established in ABAQUS to study the deep excavation effect on the underpinning piles which are constructed before the soil excavation. The parameters employed by the porous elasticity model and the critical state plasticity model in ABAQUS are decided according to the triaxial compression tests or oedometer tests. To verify the numerical simulation results, the initial void ratio obtained from the programmed subroutine and the deformations due to the soil excavation are analyzed. The variation of the axial forces with the soil excavation is presented. The distribution of the axial forces and bending moments for the piles at different locations can be obtained from the numerical simulation results. The regularities of distribution for the forces and moments are discussed and the influence factors are also mentioned. The results obtained here can be referred for similar practices. Source


Qin H.-L.,Chinese Research Institute of Highway | Qin H.-L.,China State Construction Engineering Corporation | Li F.,China Construction Second Engineering Bureau Ltd | Guo Y.-C.,Zhengzhou University
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2013

It is well known that installation of diaphragm walls in heavily overconsolidated soils will cause substantial ground deformation and can influence the behaviour of the wall during the main excavation process. However, it has not been considered that the installation effect of the panels of ultra-deep diaphragm wall in normally consolidated soils. A popular commecial finite element software, ABAQUS, is employed to simulate the panel installation process of a ultra-deep diaphragm wall in normally consolidated clay. The clay plasticity soil model in ABAQUS, which is based on the modified Cam clay model, is selected to simulate the clay characteristic. The physical meanings of the parameters for the clay model in ABAQUS are discussed, and the methods to decide the parameter values from triaxial compression tests or oedometer tests are presented. A formula for the initial void ratio and the mean effective stress in the field is deduced and used in the simulating by ABAQUS. Three-dimensional numerical models are established to simulate the installation process of the panels, including excavation under a bentonite support, placing and subsequent hardening of concrete. The deformation characteristics of the soil layers induced by the construction of wall panels as well as the influences from the width of the wall panels and the weight of the bentonite slurry are studied. Source


Qin H.-L.,China State Construction Engineering Corporation | Zhang J.-F.,Tongji University | Zhang J.-F.,China Airport Construction Group Corporation of CAAC | Guo Y.-C.,Zhengzhou University | Li F.,China Construction Second Engineering Bureau Ltd
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2012

The physical meanings of the parameters for the porous elasticity model and the critical state plasticity model in ABAQUS, a popular commercial finite element software, are discussed, and the methods to decide the parametric values from triaxial compression tests or oedometer tests are presented. Based on the relationship among the normal consolidation line, unloading-reloading line, K0 consolidation line and the critical state line of e-lnp' curves and the modified Cam-clay model, the correlation between the initial void ratio and the mean effective stress in the field is deduced and used in the simulation by ABAQUS. A soil-nailing case is simulated in ABAQUS by means of the porous elasticity model and the critical state plasticity model. The deformation results of this soil nailing case are analyzed, and the rationality is verified by the monitoring data in practice. Source

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