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[提要]  對(duì)550MPa高強(qiáng)冷彎薄壁型鋼帽型截面搭接式連續(xù)檁條受力性能進(jìn)行了試驗(yàn)研究。27根試件的試驗(yàn)結(jié)果表明，搭接式連續(xù)檁條的承載力與搭接部分剛度、截面內(nèi)力、有效截面模量等因素有關(guān)，因此，負(fù)彎矩作用下的中間支座搭接端部變截面處和正彎矩最大的跨中截面都有可能成為構(gòu)件承載力的控制截面。在確定高強(qiáng)鋼材強(qiáng)度折減系數(shù)г的基礎(chǔ)上，根據(jù)試驗(yàn)結(jié)果確定出各組試件合適的搭接段剛度系數(shù) β和承載力計(jì)算公式。
[關(guān)鍵詞]  高強(qiáng)冷彎薄壁型鋼 帽型截面 搭接式連續(xù)檁條 剛度系數(shù)

Abstract: The bearing capacity behavior of 550MPa high strength cold-formed steel lapped continuous hat section battens under bending is studied. The test results of 27 specimens show that the bearing capacity of lapped continuous battens is related to the stiffness of overlapping part, bending moment, effective section modulus and so on. Therefore both the end of overlapping part under negative moment and midspan section under maximal positive moment can be the critical sections of bearing capacity of the members. According to the determined strength reduction coefficient г  of high strength steel and test results, the proper coefficient β of stiffness and bearing capacity formulae of the members are given.
Keywords: cold formed high strength steel; hat section; lapped continuous batten; coefficient of stiffness