（中南林业科技大学土木工程与力学学院， 长沙 410004）

［摘要］为得到木-混凝土组合梁弹性阶段弯曲变形的计算方法，基于钢-混凝土组合梁折减刚度法的研究思路，提出适用于木-混凝土组合梁挠度计算的修正折减刚度法，利用试验结果对此计算方法进行验证，并与钢-混凝土组合梁的折减刚度法进行对比。结果表明，相比钢-混凝土组合梁的折减刚度法，修正折减刚度法计算精度更高，能够较准确地反映木-混凝土组合梁的变形能力。当木-混凝土组合梁连接件单位长度刚度较大且跨度较大时，可以考虑采用折减刚度法近似计算木-混凝土组合梁挠度。

［关键词］木-混凝土组合梁； 滑移效应； 挠度计算； 折减刚度法； 修正折减刚度法

中图分类号：TU398-9文献标识码：A文章编号：1002-848X(2017)17-0024-05

Modified reduction stiffness method for calculating deflection of timber-concrete composite beam

He Guojing, Leng Jun, Yang Chuanjian, Yuan Shuai

(School of Civil Engineering and Mechanics, Central South University of Forestry and Technology, Changsha 410004, China)

Abstract:To obtain calculated method of timber-concrete composite beams in elastic bending deformation stage, based on reduction stiffness method of the steel-concrete composite beams, the calculated method of modified reduction stiffness method applied to timber-concrete composite beams was presented and was verified with experimental results, as well as compared with reduction stiffness method of steel-concrete composite beams. The results shows that compared with reduction stiffness method of the steel-concrete composite beams, the proposed modified reduction stiffness method is more accurate and can more accurately reflect deformation capacity of composition beams. If stiffness of per unit length of connectors of timber-concrete composite beams  and its span are large enough, reduction stiffness method can be used to approximately calculate the deflection of timber-concrete composite beams.

Keywords:timber-concrete composite beam; slip effect; deflection calculation;  reduction stiffness method; modified reduction stiffness method

*国家林业局948项目（2014-4-51）和国家自然科学基金项目(51478485)。

作者简介：贺国京,教授，博士生导师，Email:cegjhe@hotmail.com。