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（中南林業(yè)科技大學(xué)土木工程與力學(xué)學(xué)院， 長沙 410004）
［摘要］為得到木-混凝土組合梁彈性階段彎曲變形的計(jì)算方法，基于鋼-混凝土組合梁折減剛度法的研究思路，提出適用于木-混凝土組合梁撓度計(jì)算的修正折減剛度法，利用試驗(yàn)結(jié)果對此計(jì)算方法進(jìn)行驗(yàn)證，并與鋼-混凝土組合梁的折減剛度法進(jìn)行對比。結(jié)果表明，相比鋼-混凝土組合梁的折減剛度法，修正折減剛度法計(jì)算精度更高，能夠較準(zhǔn)確地反映木-混凝土組合梁的變形能力。當(dāng)木-混凝土組合梁連接件單位長度剛度較大且跨度較大時，可以考慮采用折減剛度法近似計(jì)算木-混凝土組合梁撓度。
［關(guān)鍵詞］木-混凝土組合梁； 滑移效應(yīng)； 撓度計(jì)算； 折減剛度法； 修正折減剛度法
中圖分類號：TU398-9文獻(xiàn)標(biāo)識碼：A文章編號：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
*國家林業(yè)局948項(xiàng)目（2014-4-51）和國家自然科學(xué)基金項(xiàng)目(51478485)。
作者簡介：賀國京,教授，博士生導(dǎo)師，Email:cegjhe@hotmail.com。
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