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（1 邵陽學(xué)院城鄉(xiāng)建設(shè)學(xué)院， 邵陽 422000；　2 湖南大學(xué)土木工程學(xué)院， 長(zhǎng)沙 410082；3 貴州大學(xué)空間結(jié)構(gòu)研究中心， 貴陽 550003）

［摘要］首先采用梁殼混合模型對(duì)方鋼-混凝土組合空腹梁的變形和內(nèi)力分布特征展開了研究，然后分析了跨高比、網(wǎng)格數(shù)和剪力鍵斷面尺寸對(duì)結(jié)構(gòu)靜力響應(yīng)的變化規(guī)律。結(jié)果表明：上、下肋局部彎矩均由邊節(jié)間向中間節(jié)間遞減，且在跨中節(jié)間，局部彎矩均使肋的下側(cè)纖維受拉；除支座附近外，上肋中間節(jié)間的軸力均為壓力，而下肋中間節(jié)間的軸力均為拉力，且向跨中逐步增大。剪力鍵在肋軸力差的作用下主要表現(xiàn)為平面“錯(cuò)動(dòng)”，其內(nèi)力從支座到跨中逐步減??；隨著跨高比和網(wǎng)格間距的增大，結(jié)構(gòu)撓度和內(nèi)力均不斷增大，而隨著剪力鍵斷面尺寸的加大，撓度和內(nèi)力則有所減少。

［關(guān)鍵詞］組合空腹梁； 梁-殼混合模型； 靜力性能； 響應(yīng)規(guī)律

中圖分類號(hào)：TU398文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2018)24-0079-06

Static behavior and response regularity of square steel-concrete composite open-web beam

Yang Qizhu1,2, Ma Kejian3, Jiang Lan2, He Longxi1

(1 College of Urban Construction, Shaoyang University, Shaoyang 422000, China; 2 College of Civil Engineering, Hunan University, Changsha 410082, China；3 Space Structures Research Center, Guizhou University, Guiyang 550003, China)

Abstract:Firstly, the deformation and internal force distribution features of square steel-concrete composite open-web beam were studied by using the beam-shell mixed model. Then the variation regularity of span-to-height ratio, mesh number and section size of shear bond on the static response of the structure were analyzed.The results show that the local bending moments of the upper and lower ribs decrease from the side joints to the middle joints, and the lower rib fibers are pulled by the local bending moments in the mid-span joints. Except parts near the support, the axial force between the upper rib and the middle rib is pressure, while the axial force between the lower rib and the middle rib is tension which gradually increases toward the middle of the span. Under the action of the difference of rib axial forces, the internal force of shear bond decreases gradually from bearing to mid-span. With the increase of span-to-height ratio and mesh spacing, the structural deflection and internal force increase continuously, while the deflection and internal force decrease with the increase of section size of shear bond.

Keywords:composite open-web beam; beam-shell mixed model; static behavior; response regularity

*國(guó)家科技支撐計(jì)劃子課題（2011BAJ09B01-01），邵陽學(xué)院博士專項(xiàng)項(xiàng)目（17ZX01）。

作者簡(jiǎn)介：楊期柱，博士，講師， Email: yangqizhu@hnu.edu.cn。