圆钢管约束陶粒混凝土短柱的单轴受压试验研究及承载力计算  

Experimental Research and Bearing Capacity Calculation of Ceramsite Concrete Filled Circular Steel Tube Short Column Under Uniaxial Compression

作　　者：王宇航[1] 赵玉婷 周绪红[1] 李琦琦 WANG Yuhang;ZHAO Yuting;ZHOU Xuhong;LI Qiqi(School of Civil Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学土木工程学院,重庆400044

出　　处：《工业建筑》2022年第1期1-7,共7页Industrial Construction

基　　金：国家自然科学基金项目(51822804);霍英东教育基金会青年教师基金项目(171066)。

摘　　要：通过对14根圆钢管约束陶粒混凝土短柱进行单轴受压试验,研究钢管屈服强度、径厚比和钢管与陶粒混凝土的接触对其破坏形态、荷载-位移曲线、荷载-应变曲线、荷载-横向变形系数和承载力的影响。结果表明:轴压作用下,试件均为剪切破坏,剪切角约60°,荷载-位移曲线无明显下降段。D/t≥19时极限承载力随着径厚比的减小而增大。钢管屈服强度越高,钢管与混凝土间贴膜,钢管对混凝土的约束作用越大。不考虑钢管与混凝土间接触的影响,计算结果与试验结果吻合较好。Uniaxial compression tests were carried out on 14 short ceramsite concrete columns confined by circular steel tubes.The effects of the yield strength of steel tube,the ratio of diameter to thickness,and the contact between steel tube and ceramsite concrete on the failure mode,load-displacement curve,load-strain curve,load-lateral deformation coefficient,and bearing capacity were studied experimentally.The results showed that all specimens exhibited shear failure under axial compression,and the shear angle was about 60°,and the load-displacement curve had no obvious descending section.When D/t≥19,the ultimate bearing capacity increased with the decrease of the ratio of diameter to thickness.The higher the yield strength of steel pipe and the film between the steel pipe and the concrete,the greater the restraint effect of the steel pipe on the concrete.The calculation results were in good agreement with the test results without considering the influence of the contact between steel tube and concrete.

关 键 词：圆钢管约束陶粒混凝土 单轴受压 约束效应 极限承载力 接触 

分 类 号：TU398.9[建筑科学—结构工程]