震损钢混柱的裂缝宽度计算理论及性能分析  

Calculation Theory and Performance Analysis on Crack Width of Seismic-damaged RC Columns

作　　者：程时涛 何浩祥[1] 吴山 陈易飞 CHENG Shitao;HE Haoxiang;WU Shan;CHEN Yifei(Beijing Key Laboratory of Earthquake Engineering and Structural Retrofit,Beijing University of Technology Beijing,100124,China)

机构地区：[1]北京工业大学工程抗震与结构诊治北京市重点试验室,北京100124

出　　处：《振动．测试与诊断》2023年第4期809-816,836,共9页Journal of Vibration,Measurement & Diagnosis

基　　金：国家重点研发计划资助项目(2017YFC1500603,2017YFC1500604);国家自然科学基金资助项目(51878017)。

摘　　要：针对目前裂缝宽度在计算和测量中存在的不足,提出基于黏结滑移理论的斜裂缝宽度计算方法。针对实际在役构件所受荷载不能确定和裂缝宽度无法准确计算的局限,提出分别根据弯曲变形量和剪切变形量计算钢筋混凝土柱的横向裂缝和斜裂缝宽度的计算方法和流程。在此基础上,考虑地震下钢筋混凝土柱受压弯剪共同作用的真实状态,建立位移与裂缝宽度的理论关系,提出根据水平总位移计算最大裂缝宽度的方法和流程。试验分析表明,在压弯剪复合受力状态下,根据所提方法计算钢筋混凝土柱的最大裂缝宽度具有较高的准确性,能够反映裂缝宽度随位移增长的动态演变过程,且可根据横向裂缝以及斜裂缝的数值比例判断钢筋混凝土柱的破坏模式。Crack width can directly represent the damage characteristics of structural components,and it is an important index for seismic damage assessment.In view of the many shortcomings in the calculation methods and measurement of crack width,considering a variety of influence factors,a calculation method of diagonal crack width based on the bond-slip theory is proposed.In view of the uncertain load and the unaccurate calculation of crack width of the member in service,the calculation method and flow chart of transverse crack and oblique crack width of reinforced concrete(RC)column based on bending deformation and shear deformation are presented.On this basis,considering the real state of the RC column under the axial-flexure-shear interaction in earthquake,the theoretical relationship between the displacement and the crack width is established,and the method and process of calculating the maximum crack width according to the total horizontal displacement is proposed.The experimental results show that the maximum crack width of the RC column calculated by the proposed method is accurate and can reveal the dynamic evolution process of the crack width with the increase of displacement under the state of axial-flexure-shear interaction.In addition,the failure mode of RC column can be judged according to the numerical ratio of transverse crack and oblique crack.

关 键 词：裂缝宽度 斜裂缝 横向裂缝 钢筋混凝土柱 震损评估 压弯剪作用 

分 类 号：TU375[建筑科学—结构工程] TH11[机械工程—机械设计及理论]