山地建筑结构桩基受力特性研究

Stress Characteristic of Pile Foundation in Hillside Architecture structure

我国地形以山地为主,占全国陆地面积2/3以上,为尽可能利用有限的土地资源,较多的建筑往往依山就势,使得我国山地建筑越来越多。我国现行抗震设计规范主要是针对水平场地提供建筑结构设计依据,对非水平场地上的建筑结构没有明确规定,相应的说明也比较模糊。基于山地建筑结构桩基的受力特点,通过ANSYS有限元分析方法将桩和土体视为一个整体,同时还考虑了桩—土间的相互作用问题,对桩静动力作用下,桩侧土体的推力、抗力以及桩内力分布进行对比研究,同时分析了桩顶质量大小对桩顶水平位移的影响。分析结果表明,山地建筑结构桩基受力较为复杂,同水平场地条件下桩基的受力差别较大。在动力作用下,水平场地条件下的桩基剪力和弯矩呈抛物线分布,但山地建筑结构桩基剪力和弯矩在中部位置存在反弯点。在山地建筑结构桩基设计中,应适当提高桩基的抗剪和抗弯能力。

Hillside is the main topography in China,which accounts for 2 /3 of the total land area. In order to use the limited land resources,many buildings were often built on hillsides,which caused more and more hillside architecture in our country. The current earthquake resistant code is mainly for the architecture structures on the flat ground,and which has not clearly defined for the structures which are not on the flat ground and the corresponding instructions are rather vague. Based on the stress characteristics of pile foundation in hillside architecture structure,by using ANSYS finite element analysis software,the pile and soil were considered as a unity,the model also considered the interaction between pile and soil,static and dynamic effects of the pile,the pile side soil thrust body resistance and pile internal force distribution were compared,and the impact of the quality of the size of the pile horizontal displacement of the pile was analyzes. The results show that the hillside architecture structure pile stress is relatively complex,and the difference between the stress of the pile foundation under the condition at site. Under dynamic action,the shear force and bending moment of the pile foundation under the condition of horizontal field follows a parabola distribution,but there are some anti bending points in the middle of the shear and bending moment of the pile foundation. In pile foundation design of mountain building structure,the anti shear and bending resistance of pile foundation should be improved.