预应力混凝土组合箱梁扭后抗弯性能分析  

Bending behavior study of prestressed composite steel-concrete box beams damaged by torsion

作　　者：胡少伟[1] 胡汉林[1] 

机构地区：[1]南京水利科学研究院,江苏南京210029

出　　处：《水利水运工程学报》2011年第3期1-9,共9页Hydro-Science and Engineering

基　　金：中央级公益性科研院所重大项目<连续组合梁新型结构在工程中应用关键技术研究(>Y410006);江苏省自然科学基金资助项目(BK2007010)

摘　　要：为研究预应力混凝土组合箱梁扭后的抗弯性能,进行了5根预应力组合梁的先扭后弯试验.试验在梁跨中对称荷载作用下进行,考虑试验梁受扭矩作用历史,并与完整组合梁的试验进行对比得到扭后预应力组合梁的极限抗弯承载力、跨中弯矩-挠度曲线及钢梁截面应变增长曲线,并提出了预应力组合梁扭后承载力计算公式.试验结果表明:预应力组合梁扭后承弯能力将会降低;受扭历史影响预应力组合梁的抗弯能力;预应力能够提高扭后预应力组合梁的抗弯能力.In order to investigate the bending behavior of the prestressed composite steel-concrete box beams which have been damaged by torsion, five composite box beams are tested by symmetrical load at mid-span. Considering the history of the torsion loading on the beams, and comparing with the test about the intact beam, by tests and analysis are given some important parameters, such as the ultimate bending capacity of the composite beams, curve of moment-deflection at mid-span and curve of the increases of strain in steel beam, and a formula for calculating the bending capacity of the beams is offered in this study. The test results show that the bending capacity of the beams which have been damaged by torsion is lower than the intact beam; the history of the torsion loading would affect the bending capacity of the beams ; and the prestressing force can improve the bending capacity of the beams.

关 键 词：预应力混凝土 组合箱梁 承载能力 试验研究 

分 类 号：TU378[建筑科学—结构工程]