高强U形外包钢-混凝土组合梁受弯性能  

Bending Performances of High-Strength Steel-Encased Composite Beams

作　　者：操礼林[1,2] 石启印[1] 王震[1] 葛义韬[1] 李爱群[2] 

机构地区：[1]江苏大学土木工程系,江苏镇江212013 [2]东南大学土木工程学院,江苏南京210096

出　　处：《西南交通大学学报》2014年第1期72-78,共7页Journal of Southwest Jiaotong University

基　　金：国家杰出青年基金资助项目(50725828);江苏省"六大人才高峰"项目(2010-JZ-008);河南省交通运输科技计划项目(2012P43)

摘　　要：为研究高强U形外包钢-混凝土组合梁在静载作用下的受弯性能,对3根完全剪力连接的混凝土强度等级为C60、C80和外包钢板强度等级为Q420、Q460的简支组合梁进行了两点对称集中加载试验.分析了试件在弹性与弹塑性阶段的受力过程、荷载-挠度关系、U形外包高强钢板与内部高强混凝土应变的分布规律、外包钢板与组合梁端部滑移、裂缝发展情况以及破坏形态等;基于试验结果,提出了高强U形外包钢-混凝土组合梁正截面受弯承载力计算方法.研究结果表明:在静载作用下,高强U形外包钢-混凝土组合梁的受弯承载力比普通外包钢组合梁提高60%以上,位移延性系数分别为2.16、2.76和2.34,说明高强U形外包钢-混凝土组合梁受弯性能良好.In order to investigate the bending behavior of high-strength steel-encased composite beams under static load, bending performances of three simply-supported beam specimens with full-interaction and different strengths of steel and concrete were investigated experimentally. The load-defection relationship, strain distribution, steel-concrete interface slippage, crack development and failure mode of these beams were discussed. Based on the test results, the calculation formulas of normal section bearing capacity of high-strength steel-encased composite beam were presented. The research results show that compared with an ordinary composite beam, the bending capacity of a high-strength steel- encased composite beams under static load increases by over 60% , and the displacement ductility coefficients for the three beams are 2.16, 2.76 and 2.34, respectively, indicating that a high steel-encased composite beam has a good bending performance. strength

关 键 词：高强度钢 高强混凝土 组合梁 静力试验 受弯承载力 

分 类 号：TU398.9[建筑科学—结构工程] TU317.1