摘要
引入横向等效载荷概念,根据弹性力学变分原理,推导出了具有对称形式的杆单元P-Δ效应刚度修正矩阵。同时结合p-y曲线法,从Newmark弹簧支座的概念出发,考虑横向抗力分布的影响,提出了与有限杆单元法相适应的非线性弹簧设置方法。结合以上改进,建立了相应的倾斜荷载桩非线性有限杆单元分析模型。基于该模型编制了有限元程序,对具体工程实例进行了计算,并将计算结果与工程实测数据,以往方法的计算成果和通用有限元软件的模拟结果进行了对比分析,验证了模型的正确性和可行性,同时利用该方法计算分析了P-Δ效应的影响程度。
According to the concept of lateral equivalent load and the classical variation principle in elasticity,the present work deduces a symmetric matrix for the P-Δ effect to revise the stiffness of long piles.Meanwhile,considering the distributed horizontal soil resistance,a method of setting lateral nonlinear springs,which is very applicable in finite pole element analysis,is proposed based on the concept of Newmark spring and the p-y curve formula.Then,a nonlinear finite pole element analysis model for a single long pile under inclined load is established based on the above improvements.The relevant finite element program is compiled on the basis of the analysis model and applied to real projects.The correctness and feasibility of the proposed model is confirmed by comparing the results of this study with those of the pervious approaches,testing piles and simulations.Moreover,the influence degree of P-Δ effect is analyzed.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2011年第11期1683-1690,共8页
Chinese Journal of Geotechnical Engineering
