考虑惯性和运动相互作用桩基础抗震计算实例  

An example of seismic calculation of pile foundation considering inertia and motion interaction

作　　者：邱明兵[1] 高文生[1] 秋仁东[1] Qiu Mingbing;Gao Wensheng;Qiu Rendong(China Academy of Building Research,Beijing 100013,China)

机构地区：[1]中国建筑科学研究院,北京100013

出　　处：《建筑科学》2021年第3期39-45,共7页Building Science

基　　金：中国建筑科学研究院基础研究项目《土-结动力相互作用下土压力试验研究》20171602330710007。

摘　　要：地下结构(含桩基础)的地震响应是岩土工程领域研究热点,但是在工程师角度看建筑桩基础抗震设计还是个难点,绝大多数建筑桩基没有进行完整的抗震设计,出现研究热、工程应用冷的矛盾。本文用规范推荐的m值法计算桩基惯性相互作用,用双弹簧反应位移法计算桩基运动相互作用,根据上部结构周期大于场地特征周期的特点,组合值取两个相互作用的平方和开方。上部结构进入弹塑性状态后传递给基底的剪力和倾覆弯矩,利用性能化指标由SATWE获得。桩侧弹簧刚度按现行相关规范取值。通过算例可以看出,均匀场地可不考虑运动相互作用;惯性相互作用应考虑承台埋深,进行水平力作用下的承台-桩-土共同作用分析。The seismic response of underground structures(pile foundations)is a hot spot in the field of geotechnical engineering.However,from the perspective of engineers,the seismic design of building pile foundations is still a difficult point.Most building pile foundations have not been fully seismically designed.The contradiction of engineering application cold.In this paper,the m-value method recommended by the code is used to calculate the inertial interaction of the pile foundation,and the dual spring response displacement method is used to calculate the movement interaction of the pile foundation.According to the characteristic that the superstructure period is greater than the site characteristic period,the combined value is the sum of the squares of the two interactions.square.The shear force and overturning moment transferred to the base after the superstructure enters the elastoplastic state are obtained by SATWE using performance indicators.The stiffness of the pile side spring shall be taken according to the current relevant codes.It can be seen from the calculation example that the motion interaction can not be considered in a uniform site;the buried depth of the cap should be considered in the inertial interaction,and the interaction analysis of the cap-pile-soil under the horizontal force should be carried out.

关 键 词：桩基础抗震 双弹簧反应位移法 运动相互作用 惯性相互作用 

分 类 号：TU43[建筑科学—岩土工程]