外包槽鋼-混凝土組合梁受力性能研究
陳宗平1,張向?qū)?,范杰1,薛建陽2
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陳宗平1,張向?qū)?,范杰1,薛建陽2(1 廣西大學(xué)土木建筑工程學(xué)院, 南寧 530004; 2 西安建筑科技大學(xué)土木工程學(xué)院, 西安 710055)[摘要]設(shè)計了6 根外包槽鋼混凝土組合梁試件,進(jìn)行靜力單調(diào)抗彎加載試驗。通過實測跨中撓度、混凝土應(yīng)變、槽鋼應(yīng)變、綴件應(yīng)變等重要數(shù)據(jù),繪制構(gòu)件荷載位移、荷載應(yīng)變等重要關(guān)系曲線,分析應(yīng)變沿截面高度的分布情況,采用能量等值法計算試件的彎曲延性系數(shù),提出抗彎承載力計算公式。試驗研究和理論分析結(jié)果表明:剪跨比為30的組合梁試件均發(fā)生了彎曲粘結(jié)滑移失效破壞;粘結(jié)滑移現(xiàn)象發(fā)生之后,純彎段截面應(yīng)變沿高度分布不再符合平截面假定,試件破壞時,上部受壓槽鋼、下部受拉槽鋼屈服,剪彎段綴件沒有屈服;單調(diào)靜力加載條件下,試件的彎曲延性性能較好,變形性能良好;運用文中提出的計算公式設(shè)計外包槽鋼混凝土組合梁的抗彎承載力時,需乘以08的折減系數(shù)。[關(guān)鍵詞]外包槽鋼; 組合梁; 抗彎性能; 受彎承載力計算中圖分類號:TU398+.7文獻(xiàn)標(biāo)識碼:A文章編號:1002848X(2013)06006804Research on mechanical performance ofchannel steel encased concrete composite beamsChen Zongping1, Zhang Xianggang1, Fan Jie1, Xue Jianyang2(1 College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;2 School of Civil Engineering, Xi′an University of Architecture and Technology, Xi′an 710055, China)Abstract:In order to study mechanical behavior of channel steel encased concrete composite beams, 6 specimens were designed for monotonic static force bending loading test. Based on the data of midspan deflection, concrete strain, channel steel strain and lace bar strain, the curves of loaddeflection and loadstrain were drawn. Strain distribution along the beam height was made, bending ductility coefficient was calculated with the method of equivalent energy, and the calculating formula for bending bearing capacity was proposed. By the experimental study and theoretical analysis, it is shown that bendingbond failure mode occurs on specimens of which shear span ratio is 30. After bondslip, the strain distribution of pure bending section along the beam height no longer meets the plane section assumption. When specimens break, the upper compression channel steel and the lower tension channel steel yield, while lace bars in the bending shear sections do not yield.Under monotonic static force loading conditions, the bending ductility is high and the deformation performance is well. Bending bearing capacity of channel steel encased concrete composite beams can be designed with the calculation formular, but a reduction factor of 08 is required.Keywords:encased channel steel; composite beam; bending bearing performance; bending bearing capacity calculation*國家自然科學(xué)基金(50908057),“八桂學(xué)者”建設(shè)工程專項經(jīng)費資助,廣西科學(xué)基金(桂科青0832004)。作者簡介:陳宗平,博士,教授,Email: zpchen@gxu.edu.cn。參考文獻(xiàn)[1]薛建陽. 鋼與混凝土組合結(jié)構(gòu)設(shè)計原理[M]. 北京:科學(xué)出版社,2010.[2]石啟印,馬波,李愛群. 新型外包鋼混凝土組合梁的受力性能分析[J]. 實驗力學(xué),2005,20 (1):115122.[3]杜德潤. 新型外包鋼混凝土組合簡支梁及組合框架試驗研究[D]. 南京:東南大學(xué),2005.[4]聶建國,余志武. 鋼混凝土組合梁在我國的研究及應(yīng)用[J].土木工程學(xué)報,1999,32(2):38.[5]肖輝,李愛群,陳麗華,等. 鋼與混凝土組合梁的發(fā)展研究和應(yīng)用[J].特種結(jié)構(gòu),2005,22(1):3841.[6]余志武,聶建國,周玲宇,等.砼及預(yù)應(yīng)力砼框架結(jié)構(gòu)的延性分析[J].建筑結(jié)構(gòu),1997,27(2): 41\|45.[7]趙鴻鐵.鋼與混凝土組合結(jié)構(gòu)[M].北京:科學(xué)出版社,2001.