钢管混凝土组合桥墩变形能力计算模型  

Computing model for deformation capacity of concrete filled steel tube reinforced concrete bridge columns

作　　者：王震[1] 王景全[1,2] 戚家南[1] 

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,江苏南京210096 [2]东南大学国家预应力工程技术研究中心,江苏南京210096

出　　处：《浙江大学学报（工学版）》2016年第5期864-870,共7页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(51378110);国家支撑计划资助项目(2011BAJ09B02);江苏省"六大人才高峰"第十一批资助项目(JZ-007)

摘　　要：为准确预测钢管混凝土组合(CFSTRC)桥墩的变形能力,提出考虑剪切和纵筋滑移影响的计算模型.该模型基于纤维模型计算结果,考虑P-Δ效应,将桥墩变形分为弯曲变形、剪切变形和纵筋滑移变形3部分,分别采用塑性铰模型、压弯剪耦合作用分析方法及纵筋滑移模型计算桥墩的弯曲变形、剪切变形和纵筋滑移变形.利用计算模型与塑性铰模型对3根已知试件分别进行计算,建议模型计算结果与试验值吻合较好,塑性铰模型不能考虑剪切变形影响,计算结果较试验值偏小.结果表明:CFSTRC桥墩在轴压力和水平荷载共同作用下的剪切变形不容忽视;利用建议模型能够得到CFSTRC桥墩在压剪弯共同作用下的非线性变形全过程,结果可信,可用于CFSTRC桥墩的变形计算.A calculation model was put forward to consider influence of shear and reinforcement slip to predict deformation capacity of concrete filled steel tube reinforced concrete（CFSTRC）bridge columns accurately.Based on the calculation results of fiber model,the model took P-Δeffect into account and divided the deformation into three components,namely flexural deformation,shear deformation and reinforcement slip deformation.The plastic hinge model was used to estimate flexure deformation,the axial-FlexureShear-Interaction（AFSI）method was utilized to predict shear deformation,and the reinforcement slip model was employed to calculate reinforcement slip deformation.The proposed model and plastic hinge model were utilized to predict the deformation of three test specimens provided by literatures.Results of the proposed model show good correlation with experimental values.While the plastic hinge model cannot take shear deformation into account,the results of plastic hinge model are smaller than the experimental data.Results show that shear deformation cannot be ignored when CFSTRC bridge columns are subjected to axial compression and lateral load.The proposed model can evaluate the nonlinear deformation of CFSTRC bridge columns during the whole loading process under the combination of axial load,shear and ben-ding moment.Therefore the calculation model can be used to evaluate the deformation of CFSTRC bridge columns and gives reliable prediction.

关 键 词：桥墩 钢管混凝土 剪切变形 纵筋滑移 纤维模型 

分 类 号：U443.22[建筑科学—桥梁与隧道工程] TU392.3[交通运输工程—道路与铁道工程]