基于有限元的壁板桩水平承载特性分析

Analysis of Lateral Loaded Barrette with the Method of FEM

近年来,随着壁板桩的广泛应用,相关研究逐步展开,但水平承载特性的研究成果仅限于现场试验和弹性理论定性分析,且两者所得结果差距比较大。在香港科技大学所做的壁板桩静载试验基础上,使用ABAQUS有限元软件分析壁板桩水平承载特性,并与Zhang的数值模拟计算结果进行比较,试验数据与计算数据非常接近,相差在5%以内,验证了ABAQUS模拟壁板桩水平受荷的可行性。在此基础上分析桩顶位移、桩身弯矩在加载—卸载循环下的变化规律,进一步考虑荷载作用对壁板桩截面的非线性影响,作用力夹角α和位移夹角β相关,当荷载作用方向α=45°时,荷载与位移方向的夹角最大;x、y方向桩身最大弯矩随荷载作用角度变化而变化,α<45°,x方向的弯矩能得到有效传递,α>45°时,y方向的弯矩传递深度加深有限。分析结果有利于对壁板桩水平承载特性的理解,有利于现场试验数据与弹性理论计算结果相结合。

Recently, with barrette foundations widely used, many researchers have been carrying out on the behavior of lateral loaded. However, at present, almost all the researches are limited to field experiment and elastic - theory analysis, the results with the two methods can not coordinate with each other. Using ABAQUS to analyse lateral - loaded barrette based on the static - loaded test of The Hong Kong University of Science and Technology, The simulation results are compared with the value of Zhang to verify the feasibility of the lateral-loaded barrette. Further we consider the nonlinear effect of the load direction on the pile section, When a = 45°, included angle I fl - a I of the load and displacement got the maximum result. The maximum bending moment of pile in the direction ofx and y varies with the angle of load. When a 〈 45°, the bending moment ofx direction can be effectively transmitted, When a 〉 45°, the bending moment of Y direction can be Limited transferred to the depth. To investigate the characteristics of lateral loaded barrettes and to set a bridge on the gap of the results mentioned will have a great meaning for the research in the future.