小跨高比鋼板-混凝土組合連梁內(nèi)力分布有限元分析*
田建勃1，史慶軒2，丁鐵鋒3，王斌2，蔡文哲2
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（1 西安理工大學(xué)土木建筑工程學(xué)院，西安 710048； 2 西安建筑科技大學(xué)土木工程學(xué)院，西安 710055；3 杭州市房屋安全鑒定檢測中心有限公司， 杭州 310003）
［摘要］采用ABAQUS軟件對小跨高比鋼板-混凝土組合連梁內(nèi)力分布進行了數(shù)值分析，通過改變連梁的跨高比、鋼板厚度和縱筋配筋率，詳細(xì)分析了不同參數(shù)對小跨高比鋼板-混凝土組合連梁混凝土應(yīng)力、縱筋軸向力、鋼板內(nèi)力分布規(guī)律的影響。結(jié)果表明，小跨高比鋼板混凝土組合連梁的鋼筋混凝土部分承載機制類似于傳統(tǒng)的鋼筋混凝土連梁，并隨著連梁跨高比的增大，對角壓桿作用逐漸向桁架作用轉(zhuǎn)化；對角壓桿作用的存在將會給縱筋帶來較大的軸向拉力，使得縱筋拉力向墻肢內(nèi)縱筋末端累積；連梁縱筋配筋率對鋼板剪力和彎矩影響很小，但鋼板厚度對鋼板剪力和彎矩影響較大；鋼板軸力沿連梁跨度方向均受拉，拉力分布呈M形，連梁跨高比越大，鋼板軸力越大，而隨著縱筋配筋率的增大，鋼板軸力逐漸減??；鋼板受彎時截面受壓區(qū)高度很小，遠(yuǎn)遠(yuǎn)小于受拉區(qū)高度，建議在受彎計算中不考慮鋼板受壓。［關(guān)鍵詞］鋼板-混凝土組合連梁; 小跨高比; 有限元分析; 內(nèi)力分布中圖分類號：TU398 文獻標(biāo)識碼：A 文章編號：1002-848X(2015)15-0056-08
Finite element analysis on internal force distributions of steel platereinforced composite coupling beams with small span-to-depth ratioTian Jianbo1, Shi Qingxuan2, Ding Tiefeng3, Wang Bin2, Cai Wenzhe2（1 School of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an 710048, China; 2 School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; 3 Hangzhou Municipal Building Safety Appraisal Testing Center Co., Ltd., Hangzhou 310003, China）Abstract:The internal force distribution of steel plate-reinforced composite (SPRC) coupling beams with small span-to-depth ratio was simulated based on software ABAQUS. Furthermore, the span-to-depth ratio, plate thickness, longitudinal reinforcement ratio of coupling beams were all considered to analyze the effect on the distribution laws of concrete stress, axial force along longitudinal reinforcement and steel plate internal force of SPRC coupling beams with small span-to-depth ratio. The results show that load resisting mechanisms similar to those of conventional reinforced concrete (RC) coupling beams can be observed in the RC components of SPRC coupling beams with small span-to-depth ratio, where there is a transition from the domination of the arch action to the domination of the truss action as the span-to-depth ratio increases. The arch action could cause large axial tensions of the longitudinal reinforcement and results in accumulation of large tensile forces towards the ends of the longitudinal reinforcement in the wall piers. The longitudinal reinforcement ratio of coupling beams has little effect on the steel plate shear force and bending moment, but the steel plate thickness is the main influential factor. The steel plate along the coupling beam span bears tension force, and distribution of the tension is M-mode. The steel plate axial forces increase with the increase in span-to-depth ratio, but decrease with the increase in longitudinal reinforcement ratio of coupling beams. The height of compressive zone is far smaller than the height of tension zone when the steel plate section in bending. It is recommended that the steel plate under compression is not taken into account in the flexural calculation.Keywords:steel platereinforced composite coupling beam; small span-to-depth ratio; finite element analysis; internal force distribution
*國家自然科學(xué)基金（51178380，51478382，51108370），教育部長江學(xué)者和創(chuàng)新團隊發(fā)展計劃（IRT13089）。作者簡介：田建勃，博士， 講師，Email：tianjianbo2006@sina.com。
