多腔式多边形钢管混凝土柱偏心受压承载力研究  

STUDY ON THE ECCENTRIC COMPRESSIVE BEARING CAPACITY OF POLYGONAL MULTI-CELL CONCRETE FILLED STEEL TUBULAR COLUMNS

作　　者：徐礼华[1] 宋杨 刘素梅[1] 李彪[1] 余敏[1] 周凯凯 XU Li-hua;SONG Yang;LIU Su-mei;LI Biao;YU Min;ZHOU Kai-kai(School of Civil Engineering,Wuhan University,Wuhan,Hubei 430072,China)

机构地区：[1]武汉大学土木建筑工程学院,湖北武汉430072

出　　处：《工程力学》2019年第4期135-146,共12页Engineering Mechanics

基　　金：国家自然科学基金重点项目(51738011)

摘　　要：以天津高银117大厦巨型柱为原型,按1/20缩尺设计制作11根多腔式多边形钢管混凝土柱偏压试件,通过静力试验研究其偏心受压性能,包括破坏形态、荷载-侧向挠度关系曲线和荷载-应变关系曲线,采用ABAQUS软件拓展分析钢管壁厚、长细比、偏心率和混凝土强度等参数对试件极限承载力的影响规律。研究结果表明:多腔式多边形钢管混凝土柱偏心受压试件主要发生弯曲型失稳破坏;提高混凝土强度或钢管壁厚,可提高试件的极限承载力;腔内钢筋笼可显著提高其延性及后期承载力;当长细比从24增加到70,其极限承载力下降38.6%;当偏心率从0.2增加到1,其极限承载力下降54.1%;基于有限元结果,参考相关的承载力计算方法,建立适用于六边形六腔及五边形四腔的钢管混凝土柱偏心受压承载力计算公式,可为实际工程应用提供参考。Based on the giant columns of Goldin Finance 117 tower in Tianjin, 11 eccentric compressive test specimens of polygonal multi-cell concrete filled steel tubular columns were designed and fabricated at a scale of 1/20. Mechanical behavior of the specimens was studied through the eccentric compression test. The failure mode, the load-lateral deformation curve and the load-strain curve were investigated. The influence of the steel wall’s thickness, slenderness ratio, eccentricity and concrete strength on the ultimate bearing capacity of the specimens were analyzed by using the software package ABAQUS. The results show that the eccentric compression specimens mainly demonstrated a flexible buckling failure;the ultimate bearing capacity of the specimen increased with the increase in the strength of concrete or steel wall’s thickness;the late bearing capacity and ductility of the specimen could be increased notably by the reinforced cage in the specimens. When the slenderness ratio increased from 24 to 70, the ultimate bearing capacity decreased by 38.6%. When the eccentricity ratio increased from 0.2 to 1, the ultimate bearing capacity decreased by 54.1%. Based on the results from the finite element analysis and the subsequent calculations about the bearing capacity of the columns, a calculation formula of the bearing capacity for hexagonal six-cell and pentagon four-cell concrete filled steel tubular columns was developed which can be used as a reference for practical engineering implementation.

关 键 词：多腔式多边形 钢管混凝土 偏心受压 有限元 极限承载力 

分 类 号：TU398[建筑科学—结构工程]