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
出处
《西南交通大学学报》
EI
CSCD
北大核心
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)
关键词
高强度钢
高强混凝土
组合梁
静力试验
受弯承载力
high-strength steel
high-strength concrete
composite beam
static test
bendingcapacity
