公路桥梁钢筋混凝土墩柱位移延性研究

发布时间：2018-05-27 09:16

本文选题：钢筋混凝土墩柱 + 位移延性能力　；参考：《地震工程与工程振动》2014年03期

【摘要】：准确评估公路桥梁墩柱的位移延性能力,对于保证公路桥梁结构在地震作用下的安全性具有重要意义。应用有限元分析方法对不同设计参数的公路桥梁RC墩柱截面进行弯矩曲率分析,设计参数包括纵筋配筋率和轴压比等,得到不同设计参数墩柱的弯矩曲率曲线。通过面积相等原则确定等效屈服曲率,得到不同设计参数下的墩柱等效屈服曲率和极限曲率。通过对墩柱截面设计参数的影响因素分析,得到墩柱位移延性能力的主要影响因素。研究表明,墩柱的位移延性能力受约束混凝土极限应变、钢筋屈服应变、混凝土强度等级、轴压比及纵筋配筋率影响。其中,约束混凝土极限应变越大,墩柱的位移延性能力越强。增加箍筋体积配筋率,采用高强钢筋对提高墩柱位移延性能力都是有利的。相比而言,增大轴压比、纵筋配筋率以及提高混凝土强度等级会使得墩柱的位移延性能力降低。通过回归分析得到两类截面墩柱的受压区高度计算公式和等效屈服曲率计算公式,并与规范计算公式进行了比较。得到两类截面墩柱的位移延性系数的理论计算公式,为墩柱基于性能的抗震设计提供理论基础。
[Abstract]:Accurate evaluation of displacement ductility of highway bridge pier column is of great significance to ensure the safety of highway bridge structure under earthquake. The moment curvature of RC pier column of highway bridge with different design parameters is analyzed by using finite element method. The design parameters include reinforcement ratio and axial compression ratio, and the moment curvature curves of pier column with different design parameters are obtained. The equivalent yield curvature and limit curvature of pier column under different design parameters are obtained by using the principle of equal area. The main influencing factors of displacement ductility of piers are obtained by analyzing the influencing factors of the design parameters of piers. The results show that the displacement ductility of the pier column is affected by the ultimate strain of confined concrete, the yield strain of steel bar, the grade of concrete strength, the axial compression ratio and the reinforcement ratio of longitudinal reinforcement. The greater the limit strain of confined concrete is, the stronger the displacement ductility of pier column is. Increasing the volume reinforcement ratio of stirrups and adopting high strength steel bar are beneficial to improve the displacement ductility of pier column. In contrast, increasing axial compression ratio, reinforcement ratio of longitudinal reinforcement and strength grade of concrete will reduce the displacement ductility of pier column. By means of regression analysis, the formulas for calculating the height of the compression zone and the equivalent yield curvature of two kinds of piers with cross section are obtained, and compared with the formula calculated by the code. The theoretical formula of displacement ductility coefficient of two types of pier columns is obtained, which provides a theoretical basis for performance-based seismic design of pier columns.
【作者单位】：江苏科技大学土木工程与建筑学院;
【基金】：江苏科技大学引进人才项目(35281003) 国家自然科学基金(51308260) 江苏省土木工程与环境灾变与结构可靠性重点实验室开放基金(JSKL2011YB09) 国家安全生产监督管理总局科技项目(2012-173) 江苏省产学研联合创新资金-前瞻性联合研究项目(BY2012182)
【分类号】：U443.2;U442.5

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