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（江蘇大學(xué)土木工程與力學(xué)學(xué)院，鎮(zhèn)江 212013）
［摘要］為探究高強(qiáng)U形外包鋼-混凝土組合連續(xù)梁的受彎性能，對4根跨度為4m的組合連續(xù)梁進(jìn)行了靜載試驗(yàn)。并對其破壞形態(tài)、荷載-撓度曲線、混凝土、鋼梁及鋼筋的應(yīng)變等性能進(jìn)行了分析。結(jié)果表明：組合連續(xù)梁在兩跨跨中荷載作用下發(fā)生典型的彎曲破壞，有明顯塑性破壞特征；組合連續(xù)梁中外包U形鋼梁和負(fù)彎矩區(qū)鋼筋能通過抗剪連接件有效協(xié)同作用，整體性能良好；將高強(qiáng)混凝土與高強(qiáng)鋼板組合用于U形外包鋼-混凝土組合連續(xù)梁中是可行的，兩者通過栓釘連接，整體組合作用良好，具有良好的延性及較高的安全儲備，適用于大跨度結(jié)構(gòu)。
［關(guān)鍵詞］高強(qiáng)外包鋼-高強(qiáng)混凝土組合連續(xù)梁； 極限受彎承載力； 靜載試驗(yàn)
中圖分類號：TU375-1，TU398+.9文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2018)04-0045-05
Experimental study on ultimate flexural capacity of high strength U-shaped steel-encased high-strength concrete composite continuous beam
Chen Dadian, Shi Qiyin, Fan Xuhong, Yang Fan, Zhang Jieqiang, Tu Lianlian
(Faculty of Civil Engineering and Mechanics，Jiangsu University，Zhenjiang 212013，China)
Abstract:To study the ultimate flexural capacity of high strength U-shaped steel-encased high-strength concrete composite continuous beam, a static loading test was conducted on four 4m-span composite continuous beams. The failure pattern, load-deflection curve and the strain performances of concrete, steel beam and steel bar were analyzed. The test results show that there is typical flexural failure with obvious plastic failure characteristics under two mid-span loads of two spans. The U-shaped steel-encased beam and the steel bars in the negative moment region in the composite continuous beams can effectively cooperate through the shear connectors with the well overall performance. It is feasible to adopt high strength concrete and high strength steel plate for U-shaped steel-encased concrete composite continuous beams, and the two are connected by pegs. The overall combination hasa good effect, good ductility and high safety reserve, so it is suitable for large-span structures.
Keywords:high-strength steel-encased high-strength concrete composite continuous beam; ultimate flexural capacity; static loading test
作者簡介：陳大淀，碩士，助理工程師，Email:648778059@qq.com。
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