复合桩基梁式承台受力性状模型试验  

Model test on mechanical properties of composite pile foundation with strip cap

作　　者：江宝[1] 蒋刚[1] 王旭东[1] 宰金珉[1] 

机构地区：[1]南京工业大学岩土工程研究所,江苏南京210009

出　　处：《南京工业大学学报（自然科学版）》2010年第1期81-85,共5页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：江苏省自然科学基金资助项目(BK2004420);江苏省"青蓝工程"基金资助项目

摘　　要：通过梁式承台系列的复合桩基室内模型试验,研究了极限荷载下不同桩距的桩-承台-地基土的受力性状.试验结果表明:承台梁在墙下条形荷载作用下,地基反力分布呈马鞍形;随桩间距的增大,桩对承台梁的支承作用逐渐增强,承台梁由整体受弯过渡到局部受弯,在梁式承台下桩的支承性质为弹性支座.建议在承台梁内力计算中,应结合上部荷载形式和地基反力的分布,考虑桩距对承台梁内力的影响,及桩间距增大对桩支承作用的增强效应.Mechanical properities of pile-raft-soil with different pile spaces under the ultimate load were studied by designing the model tests on composite pile foundation with strip cap. Test showed that the distribution of subgrade reaction of the girder grillage is saddle shape on the strip load. Supporting effect on strip beam by pile was enhanced and the deformation of strip beam transformed from whole bending to lo- cal bending when the pile space increased, the pile was considered as a elastic bearing. It is suggested that the effect on the internal force of the strip beam by the pile space should be considered according to the upper load form and the distribution of the subgrade reaction. And the enhancement of bearing effect should be considered for the pile strip of composite pile foundation.

关 键 词：复合桩基 梁式承台 模型试验 地基反力 受力性状 

分 类 号：TU473[建筑科学—结构工程]