PHC管桩在高烈度软土区高层建筑中的设计与应用研究  

Research on design and application of PHC pipe pile in high⁃rise buildings in soft soil area with high seismic intensity

作　　者：王义春 王治海 左恩胜 缪长青[2] WANG Yichun;WANG Zhihai;ZUO Ensheng;MIAO Changqing(Xi’an Branch of Chengdu Benchmark Fangzhong Architectural Design Co.,Ltd.,Xi’an 710054,China;School of Civil Engineering,Southeast University,Nanjing 211896,China)

机构地区：[1]成都基准方中建筑设计有限公司西安分公司,西安710054 [2]东南大学土木工程学院,南京211896

出　　处：《建筑结构》2022年第14期124-130,16,共8页Building Structure

基　　金：国家自然基金项目(51778135),国家重点研发计划项目(2017YFC0806001)。

摘　　要：以昆明市某高层建筑项目的桩筏基础设计为工程背景,采用YJK软件建立桩筏基础计算模型,针对本工程的地质状况,进行了高烈度地区地震组合工况下混凝土PHC管桩内力研究。提出了在建筑物轮廓墙体外附近密集布置桩基并适当加厚筏板与设置抗剪弯起钢筋等提高筏板抗剪承载力的方法,进行了PHC管桩抗压优化设计;提出了水浮力与地震组合工况下PHC管桩拔力的计算方法,采用可靠的连接接头进行了PHC管桩抗拔优化设计;在分析了桩身拉力对桩身受剪承载力的影响的基础上,结合桩顶土体性质换填改良与PHC管桩填芯的有效措施,进行了PHC管桩抗剪合理设计。结果表明该PHC管桩适用于高烈度软土地区。Taking the piled raft foundation design of a high⁃rise building project in Kunming as the engineering background,the piled raft foundation calculation model was established by YJK software.According to the geological condition of this project,the internal force of concrete PHC pipe piles under combined seismic conditions in high seismic intensity areas was studied.A method of densely arranging pile foundations near the outer contour of the building and improving the shear capacity of the raft by appropriately thickening the raft and setting bent⁃up bar was proposed,and the optimized design of the PHC pipe pile compressing resistance was carried out.A method for calculating the drawing force of PHC pipe piles under the combined working conditions of water buoyancy and earthquake action was proposed,and the optimized design of the PHC pipe piles drawing resistance was carried out by using reliable connection joints.Based on the analysis of the effect of tension on pile shear capacity,the reasonable design of the PHC pipe piles shearing resistance was carried out by combining the soil replacement and improvement at the top of the pile and PHC pipe pile core filling measures.The results show that the PHC pipe pile is suitable for soft soil in high seismic intensity area.

关 键 词：高层建筑 PHC管桩 高地震烈度软土地区 水浮力 地震拔力 地震水平力 

分 类 号：TU475[建筑科学—结构工程]