圆钢管约束轻骨料钢筋混凝土轴压短柱力学性能试验  

Research on the behavior of circular tubular confined lightweight aggregate reinforced concrete stub columns under axial compression

作　　者：刘文晓[1] 姜凡[1] 李淼 李斌 LIU Wenxiao;JIANG Fan;LI Miao;LI Bin(Department of Railway Engineering,Baotou Railway Vocational&Technical College,Baotou 014060,China;Civil Engineering Institute,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]包头铁道职业技术学院铁道工程系,内蒙古包头014060 [2]内蒙古科技大学土木工程学院,内蒙古包头014010

出　　处：《混凝土》2020年第8期19-22,26,共5页Concrete

基　　金：国家自然科学基金资助项目(51068021,11172131);内蒙古自然科学基金资助项目(2012MS0711);内蒙古自治区教育厅课题:冻融循环作用下橡胶颗粒轻质混合土(RST轻质土)强度特性试验研究(NJZY20184);包头铁道职业技术学院课题:冻融循环作用下橡胶颗粒轻质混合土(RST轻质土)强度特性实验研究(BTZY201911)。

摘　　要：为了研究圆钢管约束轻骨料钢筋混凝土轴压短柱的力学性能,以钢管径厚比(110、73、55)、混凝土强度(LC30、LC40)、是否配筋为三个主要参数,进行了12个试件的单调静力加载试验,研究了试件的破坏模式、极限承载力、荷载-应变关系,考察了试验参数对试件力学性能的影响规律。试验结果表明:在钢管约束作用下,核心轻骨料混凝土的强度明显提高,变形性能得到改善;试验结束时试件的压缩变形很明显,钢管外凸明显,径厚比大的钢管在切口处或中部出现撕裂破坏;混凝土中配制纵筋对试件的承载能力提高较为明显,对试件的延性无明显改善;钢管径厚比越小,试件的承载力越高而延性越好;混凝土强度的提高并不能显著增加试件的承载力。The behavior of 12 circular tubed reinforced lightweight aggregate concrete columns was investigated experimentally under monotonous static loading in order to study the mechanical properties of circular tubular confined lightweight aggregate reinforced concrete stub columns.There are three parameters the diameter-to-thickness ratio of the steel tube(110,73 and 55),the compressive strength of concrete(LC30 and LC40)and whether there is reinforcement.The failure mode,ultimate bearing capacity and the load-strain relationship were studied.The effect of experimental parameters on the mechanical properties of the specimens was investigated.The test results indicate that The strength of the core lightweight aggregate concrete increased significantly and the deformation performance is improved under the confinement of steel tube.The steel tube is obvious outer convex at the end of the test.The slit appears in the notch or middle when in large diameter-to-thickness ratio.The bearing capacity of the specimens are significantly improved when the longitudinal reinforcement is placed in the concrete,however,the ductility changes little.The diameter-to-thickness ratio is lower,both the bearing capacity and ductility of specimen are better.The bearing capacity of specimen improves slightly as the increase of concrete compression strength.

关 键 词：钢管约束混凝土 轻骨料混凝土 轴压短柱 破坏形态 

分 类 号：TU528.571[建筑科学—建筑技术科学]