大比尺高含钢率型钢混凝土柱滞回性能试验  

Experimental study on hysteretic properties of large-size SRC columns with high ratio of encased steel

作　　者：殷小溦[1] 吕西林[1] 卢文胜[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《土木工程学报》2012年第12期91-98,共8页China Civil Engineering Journal

基　　金：国家自然科学基金重点项目(90815029);国家自然科学基金国际合作项目(51021140006)

摘　　要：对8个含钢率分别为13.12%和15.04%的大比尺型钢混凝土柱进行水平低周反复加载试验,考察高含钢率型钢混凝土框架柱在反复荷载作用下的受力特点、破坏形态和变形特征。试件设计轴压比介于0.5～1.2之间,在压、弯、剪共同作用下发生弯曲型破坏。试验得到荷载-位移滞回曲线及型钢和钢筋的应变曲线,验证了型钢与混凝土的共同工作性能。试件滞回曲线具有良好的饱满性,每级滞回环大致重合,承载力没有发生明显退化,表明构件具有良好的耗能性能和抗震能力。根据平衡方程提出的承载力实用计算方法,可以相对准确的预测内置十字形带翼缘型钢的型钢混凝土柱正截面抗弯承载力。得到的截面M-N关系曲线可以为设计和进一步研究提供参考。8 large-size SRC columns with 13.12% and 15.04% encased steel were tested under low-frequency cyclic lateral loading. The mechanical properties, failure modes and deformabilities are studied. The axial load ratios of the specimens range from 0.5 to 1.2. All the specimens showed flexure failures subject to combined axial force, bending moment and shear forces. Force-displacement hysteretic curves, strain curves of encased steels and rebars are obtained. The interaction behavior between encased steels and concrete are verified. The hysteretic curves of columns are plump in shapes. Hysteresis loops keep coincident under the same levels of lateral loads, and the bearing capacities does not change much, which indicate that the columns have good energy-dissipation performance and aseismic capacity. Based on the equilibrium equation, the suggested practical calculation method can accurately predict the bending-resistant capacities of SRC columns with encased cross-shaped section steels. The obtained M-N curves of cross-sections of SRC columns can be used as references tbr further studies.

关 键 词：型钢混凝土 滞回性能 轴压比 高含钢率 承载力 

分 类 号：TU375.302[建筑科学—结构工程] TU317.1