（中国市政工程中南设计研究总院有限公司， 武汉 430010）

［摘要］通过定义钢-混凝土组合梁的挠度放大系数，总结了不同计算方法得到的挠度放大系数计算公式，通过作图分析了各种计算方法的特点及适用范围。对比分析了不同荷载形式下两端简支梁以及不同边界条件下单跨组合梁受均布荷载作用时的挠度放大系数与精确解的误差；与已有试验结果对比发现改进折减刚度法得到的计算值与试验值吻合较好，表明改进折减刚度法可应用于单跨钢-混凝土组合梁的挠度计算，公式简单，计算方便，精度较高。

［关键词］组合梁； 部分抗剪连接； 改进折减刚度法； 挠度放大系数

中图分类号：TU398-9文献标识码：A文章编号：1002-848X(2019)08-0085-06

Study on deflection calculation method of steel-concrete composite beam

Chen Dequan, Chen Qiang, Fan Jun

(Central and Southern China Municipal Engineering Design & Research Insitute Co., Ltd., Wuhan 430010, China)

Abstract:By defining the deflection amplification factor of steel\|concrete composite beam, the formula of deflection amplification factor obtained by different calculation methods was summarized, and the characteristics and applicable scope of various calculation methods were analyzed by hand computation. The errors of the deflection magnification factor of the exact solution of the simply supported beams with different load forms and the single span composite beams subjected to uniform load under different boundary conditions were compared and analyzed. Compared with the existing experimental results, the calculated results obtained by the modified reduced stiffness method (MRSM) were in good agreement with the experimental values, indicating that the MRSM could be applied to calculate the deflection of steel-concrete composite beams. The formula was simple, convenient for calculation, with high precision.

Keywords:composite beam; partial shear connection; modified reduced stiffness method; deflection amplification factor

作者简介：陈德权，硕士，工程师，Email: chendequan610@126.com。