现浇钢筋混凝土结构中施工缝的模型化研究初探
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摘要
针对此次汶川地震震害调查中发现的大量施工缝部位震害现象,对现浇钢筋混凝土结构中不可避免存在的施工缝的受力机理展开研究.目前对钢筋混凝土结构进行数值分析时,均不考虑施工缝的影响,按照结构一次性整体浇筑进行建模,这与实际情况不符.为了找出震害原因,通过分析施工缝部位混凝土和钢筋两种类型材料的受力特点和在地震作用下各自承担力的情况,建立相应的简化力学模型.引用摩擦的粘着犁沟理论解决缝面的剪力传递问题.基于常用的有限元分析软件,给出设置施工缝单元需要考虑材料非线性的方法.对一根带缝试验柱建模进行非线性分析,验证了本文提出的建模方法是可行的.
According to the seismic damage investigation in Wenchuan,the effect of construction joints which can′t be avoided in cast-in-situ reinforced concrete structure should be noted.The influence of construction joints is not considered in regular nonlinear numerical simulation,which deviates from the truth.Through analysis of stress characteristics of rebar and concrete,this thesis develops a mechanics model describing the seismic response of joints.so as to find out the cause of earthquake damage.On this basis,it builds up the finite element model of construction joints applied to massive structure.The results show that this new analysis method can help obtain better interpretations with earthquake disaster phenomena.
According to the seismic damage investigation in Wenchuan,the effect of construction joints which can′t be avoided in cast-in-situ reinforced concrete structure should be noted.The influence of construction joints is not considered in regular nonlinear numerical simulation,which deviates from the truth.Through analysis of stress characteristics of rebar and concrete,this thesis develops a mechanics model describing the seismic response of joints.so as to find out the cause of earthquake damage.On this basis,it builds up the finite element model of construction joints applied to massive structure.The results show that this new analysis method can help obtain better interpretations with earthquake disaster phenomena.
引文
[1]魏春明,赵星海.钢筋混凝土结构施工缝处理方法研究[J].混凝土,2008,225(7):120-123.WEI C M,ZHAO X H.Treating methods of cast-in-situ reinforced concrete structures with construct ionjoints[J].Concrete,2008,225(7):120-123.
[2]JENSEN B C.Lines of discontinuity for displacements in the theory of plasticity of plain and reinforced concrete[J].Magazine of Concrete Research,1975(92):143-150.
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[4]宋玉普,魏春明.混凝土施工缝接缝面劈拉强度试验研究[J].混凝土,2006,200(6):22-25.SONG Y P,WEI C M.Experi mental research on the splitting tensile strength for joint surface of concrete con-structionjoint[J].Concrete,2006,200(6):22-25.
[5]陈福厚.混凝土原材料与施工缝处理[J].中国三峡建设,2003(3):14-15,18.CHEN F H.Concrete Raw Materials and Treat ment of Construction Joints[J].CHINA THREE GORGES CON-STRUCTION,2003(3):14-15,18.
[6]CLARK L A,GILL B S.Shear strength of smooth unreinforced constructionjoints[J].Magazine of Concrete Re-search,1985(131):95-100.
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[8]SCOTT B D,PARK R,PRIESTLEYJ N.Stress-strain behavior of concrete confined by overlapping hoops at lowand high strain rates[J].ACI Journal,1982,79:13-27.
[9]张琦,过镇海.砼抗剪强度和剪切变形的研究[J].建筑结构学报,1992,13(5):17-24.ZHANG Q,GUO Z H.Investigation on Shear-Strength and Shear-Strain of Concrete[J].Journal of BuildingStructures,1992,13(5):17-24.
[10]魏春明,宋玉普,刘健.现浇钢筋混凝土框架柱施工缝抗震性能试验研究[J].大连理工大学学报,2006,45(4):527-532.WEI C M,SONG Y P,LI UJ.Experi mental research on seismic behavior of cast in-site RCframe columns withconstructionjoint[J].Journal of Dalian University of Technology,2006,45(4):527-532.
[11]李英民,韩军,刘立平,等.“5.12”汶川地震砌体结构房屋震害调查与分析[J].西安建筑科技大学学报:自然科学版,2009,41(5):606-611.LI Ying-min,HANJun,LI U Li-ping.Investigation and analysis of masonry building damage caused by the 5.12 Wen chuan earthquake,Sichuan Province[J].J.Xi′an Univ.of Arch.&Tech.(Natural Science Edition),2009,41(5):606-611.
[2]JENSEN B C.Lines of discontinuity for displacements in the theory of plasticity of plain and reinforced concrete[J].Magazine of Concrete Research,1975(92):143-150.
[3]MATTOCK A H.Cyclic shear transfer and type of interface[J].Journal of the Structural Division,ASCE,1981,107(10):1945-1964.
[4]宋玉普,魏春明.混凝土施工缝接缝面劈拉强度试验研究[J].混凝土,2006,200(6):22-25.SONG Y P,WEI C M.Experi mental research on the splitting tensile strength for joint surface of concrete con-structionjoint[J].Concrete,2006,200(6):22-25.
[5]陈福厚.混凝土原材料与施工缝处理[J].中国三峡建设,2003(3):14-15,18.CHEN F H.Concrete Raw Materials and Treat ment of Construction Joints[J].CHINA THREE GORGES CON-STRUCTION,2003(3):14-15,18.
[6]CLARK L A,GILL B S.Shear strength of smooth unreinforced constructionjoints[J].Magazine of Concrete Re-search,1985(131):95-100.
[7]段云岭,刘华北.材料非线性接缝模型[J].清华大学学报:自然科学版,2000,40(8):98-101.DUAN Y L,LI U H B.Material nonlinear joint model[J].J.Tsinghua Univ.(Sci.&Tech.),2000,40(8):98-101.
[8]SCOTT B D,PARK R,PRIESTLEYJ N.Stress-strain behavior of concrete confined by overlapping hoops at lowand high strain rates[J].ACI Journal,1982,79:13-27.
[9]张琦,过镇海.砼抗剪强度和剪切变形的研究[J].建筑结构学报,1992,13(5):17-24.ZHANG Q,GUO Z H.Investigation on Shear-Strength and Shear-Strain of Concrete[J].Journal of BuildingStructures,1992,13(5):17-24.
[10]魏春明,宋玉普,刘健.现浇钢筋混凝土框架柱施工缝抗震性能试验研究[J].大连理工大学学报,2006,45(4):527-532.WEI C M,SONG Y P,LI UJ.Experi mental research on seismic behavior of cast in-site RCframe columns withconstructionjoint[J].Journal of Dalian University of Technology,2006,45(4):527-532.
[11]李英民,韩军,刘立平,等.“5.12”汶川地震砌体结构房屋震害调查与分析[J].西安建筑科技大学学报:自然科学版,2009,41(5):606-611.LI Ying-min,HANJun,LI U Li-ping.Investigation and analysis of masonry building damage caused by the 5.12 Wen chuan earthquake,Sichuan Province[J].J.Xi′an Univ.of Arch.&Tech.(Natural Science Edition),2009,41(5):606-611.
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