钢管轻集料混凝土短柱偏心受压性能的试验  

Experimental behavior of lightweight aggregate concrete-filled circular steel tube stubs subjected to eccentric loading

作　　者：吉伯海[1] 傅中秋[1] 胡正清[1] 

机构地区：[1]河海大学土木工程学院,江苏南京210098

出　　处：《交通科学与工程》2009年第3期22-28,共7页Journal of Transport Science and Engineering

基　　金：江苏省自然科学基金(BK2008359);江苏省"六大人才高峰"2007资助项目(B类)

摘　　要：进行了18根钢管轻集料混凝土短柱的偏心受压试验.分析了偏心荷载作用下不同含钢率、偏心率的钢管轻集料混凝土短柱的破坏过程、破坏模式及破坏机理,并对试件的承载力影响参数及其承载力性能开展了研究.试验结果表明,钢管轻集料混凝土短柱在偏压荷载作用下,其荷载-挠度曲线主要分弹性阶段、弹塑性阶段和下降段;内填轻集料混凝土能够有效延缓外侧钢管的局部屈曲;试件的破坏模式属于弹塑性破坏或塑性破坏;在试件中截面,钢管对核心轻集料混凝土的约束作用与受力区域及加载过程有关;含钢率和偏心率对试件的极限承载力性能有一定影响,含钢率越大,试件承载力极限也越大,偏心率越大,试件极限承载力越小;钢管轻集料混凝土短柱偏压承载力与相同条件下的钢管普通混凝土短柱大致相当.18 lightweight aggregate concrete filled steel tube（LACFST） stubs were tested under eccentric load. The course of deformation, failure mode and failure mechanism were analyzed by observing the phenomena and summarizing the data. In addition, the parameters influencing the bearing capacity were discussed and the bearing capacities of LACFST stubs were studied. The test results indicate that the load-alisplacement curves of specimens were divided into elas- tic phase, elastic-plastic phase and descending phase. The bulking of steel tubes was delayed as the effect of lightweight aggregate concrete. The failure modes of specimens belonged to plas- tic deformation or elastic-plastic deformation. Not only the position of the surface but also the process of loading is related to the steel tubes＇ restrain effect on core lightweight aggregate con- crete. The bearing capacity of lightweight aggregate-filled circular steel tube stubs subjected to eccentric loading was related to eccentricity ratio and steel ratio. Furthermore, it is not less than normal concrete-filled steel tube stubs.

关 键 词：钢管轻集料混凝土短柱 极限承载力 含钢率 偏心率 破坏模式 

分 类 号：U448.38[建筑科学—桥梁与隧道工程]