大规模桩筏基础非线性共同作用简化分析方法  

A simplified method for the analysis of the nonlinear interaction of large scale piled rafts

作　　者：孙晓立[1] 杨敏[1] 

机构地区：[1]同济大学,上海200092

出　　处：《土木工程学报》2006年第9期91-97,共7页China Civil Engineering Journal

基　　金：教育部高等学校博士学科点专项基金资助(20020247003)

摘　　要：提出一种分析桩筏基础非线性共同作用的简化分析方法。将单桩的载荷试验结果应用到桩筏基础的沉降分析中,从而使得沉降预测结果更符合工程实际情况。将筏板假定为弹性薄板,筏板下的群桩假定为相互作用的非线性弹簧,使用双曲线函数拟合载荷试验的Q-S曲线,并用它来模拟桩在荷载下的非线性响应。采用相互作用系数法分析桩-桩间的相互作用,同时考虑桩的“加筋”对相互作用系数的影响。为了简化计算,采用多项式拟合桩-桩、桩-土相互作用系数。使用弹性半空间或有限层理论分析土节点间的相互作用。经过实例分析比较,该方法不但可以节省大量机时,而且可以得到较满意的预测结果。该简化方法可以用于工程实践。A simple method is proposed for the analysis of the nonlinear interaction of large piled rafts. The simple method involves applying single pile load test result to the settlement of piled rafts. The raft is modeled as a thin plate and the piles are modeled as interacting nonlinear springs. The Q-S curves from single pile load test can be simulated by a hyperbola function, which can be employed to model the non-linear characteristics of the piles. The interaction between piles is analyzed by using interaction factors, and the ＇restraint＇ action between piles is considered. The factors of pile-pile and pile-soil interactions are simulated by using muhinomial regressions. The interaction between soil elements can be analyzed by elastic semi-space or finite layer theory. Comparing with the results of the piled raft and the model pile groups, the approximate method can save computing time while gives a reasonable results.

关 键 词：桩筏基础 相互作用系数 非线性 

分 类 号：TU473.1[建筑科学—结构工程]