用于混合配筋节段拼装桥墩抗震设计的骨架曲线模型分析  

Analysis of skeleton curve model used for seismic design of hybrid reinforced precast segmental bridge column

作　　者：蔡忠奎 苑溦 路广 张建林 徐芬[2] Cai Zhongkui;Yuan Wei;Lu Guang;Zhang Jianlin;Xu Fen(College of Civil Engineering,Nanjing Tech University,Nanjing 211816,China;School of Civil Engineering and Architecture,Jiangsu Open University,Nanjing 210036,China;Nanjing Chemical Fibre,Nanjing 210019,China;China Academy of Building Research,Beijing 100013,China)

机构地区：[1]南京工业大学土木工程学院,江苏南京211816 [2]江苏开放大学建筑工程学院,江苏南京210036 [3]南京化纤股份有限公司,江苏南京210019 [4]中国建筑科学研究院有限公司,北京100013

出　　处：《建筑科学》2024年第11期140-150,共11页Building Science

基　　金：国家自然科学基金项目(51908283、51908251);2022江苏高校“青蓝工程”项目。

摘　　要：预制节段拼装桥墩(Precast Segmental Bridge Column, PSBC)与现浇钢筋混凝土(RC)桥墩相比,具有突出的建造效率优势和环保优势。然而,各类形式的PSBC大多无法做到抗震性能及震后可修复性的兼顾。为解决此问题,本文提出了混合配筋节段拼装桥墩(Hybrid Reinforced PSBC, HR-PSBC)的概念并对此类桥墩抗震设计方法进行探究。首先,基于OpenSees平台建立了HR-PSBC精细化纤维单元模型,实现了对FRP筋断裂、纵筋应变渗透所致粘结滑移、节段间相对转动等复杂力学行为的准确模拟;其次,通过与前期开展的HR-PSBC试件试验所得结果进行对比,验证了建模方法的精确性,弥补了当前研究中缺乏HR-PSBC抗震性能高效数值分析方法的不足;在此基础上,开展了HR-PSBC单调推覆性能分析,揭示了混配比例、FRP筋弹性模量、FRP筋弹性极限强度、耗能钢筋配筋率、混凝土轴心抗压强度、轴压比、剪跨比等对HR-PSBC骨架曲线特征点的影响规律;最后,提出用于混合配筋节段拼装桥墩抗震设计的双折线骨架曲线模型。研究旨在为HR-PSBC抗震设计方法的提出打下基础。Compared with cast-in-place reinforced concrete(RC)bridge columns,precast segmental bridge columns(PSBC)have outstanding advantages in construction efficiency and environmental protection.However,most forms of PSBC cannot achieve a balance between seismic performance and post-earthquake repairability.To address this issue,this paper proposes the concept of hybrid reinforced PSBC(HR-PSBC)and explores the seismic design method of such bridge piers.First,a refined fiber model is established based on the OpenSees software.The behaviors of FRP bar fracture,bond slip induced by strain penetration of longitudinal bar and relative rotation between segments are accurately simulated.Second,the modeling method is verified by the test data of HR-PSBC specimens.Based on those,the pushover analysis of HR-PSBC is conducted,and the influence of hybrid ratio,elasticity influence of FRP bars,elastic strength of the FRP bars,reinforcement ratio of energy dissipation bars,concrete strength,axial compression ratio and shear span ratio on the characteristic points of skeleton curve is revealed.Finally,the bilinear skeleton curve model used for seismic design of HR-PSBC is proposed.The research aims to laying the foundation for the seismic design method of HR-PSBC.

关 键 词：混合配筋节段拼装桥墩 精细化纤维单元模型 参数分析 骨架曲线特征点 抗震设计 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]