（江苏大学土木工程与力学学院， 镇江 212013）

［摘要］设计了内翻U形高强外包钢-高强混凝土连续组合梁，并采用了一体式开孔板剪力连接件。为研究梁的内力重分布规律，对3根足尺两跨连续组合梁进行跨中对称单调加载。结果表明，梁中间支座截面和跨中截面塑性变形均充分发展，具有较好的转动能力和延性，能够保证塑性铰充分形成。通过试验和理论分析，提出了弯矩调幅系数β和力比R关系公式及限值，给出了极限承载力设计时弯矩的计算公式。

［关键词］连续组合梁； 内翻U形高强外包钢； 高强混凝土； 内力重分布； 弯矩调幅系数； 力比

中图分类号：TU398， TU317-1文献标识码：A文章编号：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

*国家科技支撑计划项目(2015BAL02B02)，江苏省2015年度普通高校研究生实践创新计划（SJLX15_0501）。

作者简介：张兆昌，硕士，Email: 1538719276@qq.com。