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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］設(shè)計(jì)了內(nèi)翻U形高強(qiáng)外包鋼-高強(qiáng)混凝土連續(xù)組合梁，并采用了一體式開(kāi)孔板剪力連接件。為研究梁的內(nèi)力重分布規(guī)律，對(duì)3根足尺兩跨連續(xù)組合梁進(jìn)行跨中對(duì)稱單調(diào)加載。結(jié)果表明，梁中間支座截面和跨中截面塑性變形均充分發(fā)展，具有較好的轉(zhuǎn)動(dòng)能力和延性，能夠保證塑性鉸充分形成。通過(guò)試驗(yàn)和理論分析，提出了彎矩調(diào)幅系數(shù)β和力比R關(guān)系公式及限值，給出了極限承載力設(shè)計(jì)時(shí)彎矩的計(jì)算公式。

［關(guān)鍵詞］連續(xù)組合梁； 內(nèi)翻U形高強(qiáng)外包鋼； 高強(qiáng)混凝土； 內(nèi)力重分布； 彎矩調(diào)幅系數(shù)； 力比

中圖分類號(hào)：TU398， TU317-1文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2019)06-0055-06

Experimental research on section design and internal force redistribution of  inverted U-shaped high-strength encased steel and high-strength concrete continuous composite beam

Zhang Zhaochang， Fan Xuhong， Yang Fan， Meng Qiuwei

(Faculty of Civil Engineering and Mechanics， Jiangsu University, Zhenjiang 212013， China)

Abstract:Inverted U-shaped high-strength encased steel and high-strength concrete continuous composite beam was designed with integral perforated steel shear connector. In order to study the internal force redistribution of beams, three full-scale two-span continuous composite beams were loaded symmetrically and monotonously in mid-span. The results show that the plastic deformations of the middle support section and the mid-span section of the beam are fully developed, which has good rotation ability and ductility, and can ensure the full formation of plastic hinges. Through experimental and theoretical analyses, the formula and limit value of the relationship between moment redistribution coefficient β and force ratio R were put forward, and the formula for calculating bending moment in the design of ultimate bearing capacity was given.

Keywords:continuous composite beam; inverted U-shaped high-strength encased steel; high-strength concrete; internal force redistribution; moment redistribution coefficient; force ratio

*國(guó)家科技支撐計(jì)劃項(xiàng)目(2015BAL02B02)，江蘇省2015年度普通高校研究生實(shí)踐創(chuàng)新計(jì)劃（SJLX15_0501）。

作者簡(jiǎn)介：張兆昌，碩士，Email: 1538719276@qq.com。