复式钢管混凝土柱受压性能研究  

Research on compressive performance of compound concrete filled steel tubular pile foundation

作　　者：陈洪敏 刘文超 彭佳 刘笑影 CHEN Hongmin;LIU Wenchao;PENG Jia;LIU Xiaoying(CCCC Construction Group Co.,Ltd.,Beijing 100022,China;Research and Development Center on Green Building Technology,CCCC,Beijing 100022,China;Beijing University of Technology,Beijing 100124,China)

机构地区：[1]中交建筑集团有限公司,北京100022 [2]中交集团绿色建筑技术研发中心,北京100022 [3]北京工业大学,北京100124

出　　处：《建筑结构》2022年第S02期1375-1379,共5页Building Structure

基　　金：住建部科学技术计划项目(2021-K-031)

摘　　要：以厦门岛外第一高楼厦门白鹭西塔为工程背景,提出了采用复式钢管混凝土柱的设计方案。本文设计了3个复式钢管混凝土试件,设计参数为钢管壁厚及受压面积,进行轴压性能试验,并利用ABAQUS建模,分析了外钢管壁厚、受压面积等参数变化对试件轴向受压力学性能的影响规律,明确复式钢管混凝土构件在轴向全截面受压和局部承压荷载作用下的工作机理,为工程设计提供技术参考。结果表明,复式钢管混凝土柱全截面受压破坏为腰鼓状破坏,中部出现半圆凸曲;局部受压破坏现象为加载端部外钢管向外鼓曲;试件的受压承载力随着外钢管壁厚提高而提高;相同外钢管壁厚下,试件局部受压的承载力相较于全截面受压降低。Taking Xiamen Bailu West Tower, the tallest building outside Xiamen Island as the engineering background, a compound concrete-filled steel tube pile column is proposed in the design procedure. Local compression is a common stress condition of the member in service, and few scholars have studied the axial local compression performance of the compound concrete-filled steel tubular columns. In this paper, three compound concrete-filled steel tubular specimens were designed, and the mechanical properties of the specimens were tested under full-section compression and partial axial compression, and the ABAQUS was used for parametric analysis, to investigate the influence of the wall thickness of the outer steel tube, with or without bearing plate and other parameters on the mechanical properties of the specimens under axial compression, and to clarify the working mechanism of compound concrete-filled steel tubular members under full-section axial compression and partial axial compression load, which provided technical reference for engineering design. The results show that the full-section compression failure of the compound concrete-filled steel tubular column is waist-drum failure, with a semicircular convex curve in the middle. The partial compression failure phenomenon is that the outer steel pipe at the loading end bulges outwards;The compressive bearing capacity of the specimen increases with the increase of the wall thickness of the outer steel tube;Under the same outer steel tube wall thickness, the bearing capacity of the specimen under local compression is lower than that under full-section compression.

关 键 词：复式钢管混凝土 桩基 承载力 有限元 

分 类 号：TU398.9[建筑科学—结构工程]