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PHC 管桩在高烈度软土区高层建筑中的设计与 应用研究
王义春1 , 王治海1 , 左恩胜1 , 缪长青2
摘 要

(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)

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。

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

中图分类号:TU475+. 1 文献标志码:A 文章编号:1002⁃848X(2022)14⁃0124⁃07

 

DOI:10􀆰 19701 / j􀆰 jzjg􀆰 LS202005

 

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

WANG Yichun1, WANG Zhihai1, ZUO Ensheng1, MIAO Changqing2

(1 Xi’ an Branch of Chengdu Benchmark Fangzhong Architectural Design Co. , Ltd. , Xi’ an 710054, China;2 School of Civil Engineering, Southeast University, Nanjing 211896, China)

Abstract: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 thisproject, the internal force of concrete PHC pipe piles under combined seismic conditions in high seismic intensity areas wasstudied. A method of densely arranging pile foundations near the outer contour of the building and improving the shearcapacity of the raft by appropriately thickening the raft and setting bent⁃up bar was proposed, and the optimized design ofthe PHC pipe pile compressing resistance was carried out. A method for calculating the drawing force of PHC pipe pilesunder the combined working conditions of water buoyancy and earthquake action was proposed, and the optimized design ofthe PHC pipe piles drawing resistance was carried out by using reliable connection joints. Based on the analysis of the effectof tension on pile shear capacity, the reasonable design of the PHC pipe piles shearing resistance was carried out bycombining the soil replacement and improvement at the top of the pile and PHC pipe pile core filling measures. The resultsshow that the PHC pipe pile is suitable for soft soil in high seismic intensity area.

Keywords:high⁃rise building; PHC pipe piles; soft soil area with high seismic intensity; water buoyancy; drawing force ofearthquake; horizontal seismic force

∗国家自然基金项目(51778135),国家重点研发计划项目(2017YFC0806001)。
第一作者:王义春,硕士,工程师,一级注册结构工程师,主要从事民用建筑结构设计与研究,Email:Wangyic87@ 163. com。
 
[引用本文] 王义春,王治海,左恩胜,等. PHC 管桩在高烈度软土区高层建筑中的设计与应用研究[ J]. 建筑结构,2022,52(14):124⁃130,16. WANG Yichun, WANG Zhihai, ZUO Ensheng, et al. Research on design and applicationof PHC pipe pile in high⁃rise buildings in soft soil area with high seismic intensity[J]. Building Structure,2022,52(14):124⁃130,16.
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