不同上部结构山区桥梁墩台抗震响应分析  

Seismic Response Analysis of Bridge Pier with Different Superstructure in Mountain Area

作　　者：李茂江 LI Maojiang(CCCC Water Conservancy and Hydropower Construction Co.,Ltd.,Ningbo,Zhejiang 315200,China)

机构地区：[1]中交水利水电建设有限公司,浙江宁波315200

出　　处：《黑龙江交通科技》2024年第12期99-103,共5页Communications Science and Technology Heilongjiang

摘　　要：为提高桥梁结构抗震能力,保障结构正常运行,展开了预应力混凝土T梁和钢混组合梁两种不同上部结构对山区桥梁墩台的抗震响应影响差异研究。首先建立了精细化有限元模型,上部结构采用梁格法建模,下部结构考虑山区桥墩常用结构形式,包括柱式桥台、重力式桥台、柱式桥墩、实体桥墩。基于反应谱法分析了两种上部结构形式对桥梁墩台造成的抗震响应差异,结果表明:预应力混凝土T梁与钢混组合梁的桥梁整体结构动力响应差异主要体现在一阶振型,T梁桥周期长于钢混组合梁桥;T梁对墩台造成的抗震响应(弯矩、剪力、墩顶位移、轴力)基本呈现大于钢混组合梁的趋势,差异主要体现在处于固定约束的桥墩处;屈服分析结果表明,T梁和钢混组合梁作用下的墩台结构在E1、E2地震荷载作用下均处于弹性状态,未达到屈服强度。In order to improve the seismic ability of bridge structure and ensure the normal operation of the structure,the difference of seismic response of prestressed concrete T-beam and steel-concrete composite beam on bridge pier in mountain area is studied.Firstly,a fine finite element model is established.The upper structure is modeled by the beam lattice method,and the lower structure considers the common structural forms of mountain pier,including column abutment,gravity abutment,column abutment and solid abutment.Based on the response spectrum method,the seismic response difference of the two types of superstructure to the bridge pier is analyzed.The results show that the difference of the overall structural dynamic response of the prestressed concrete T-beam and steel-concrete composite beam is mainly reflected in the first-order vibration mode,and the period of T-beam bridge is longer than that of steel-concrete composite beam bridge.The seismic response(bending moment,shear force,pier top displacement and axial force)caused by T-beam to pier shows a trend of greater than that of steel-concrete composite beam,and the difference is mainly reflected in the pier under fixed constraints.The yield analysis results show that the pier structure under the action of T-beam and steel-concrete composite beam is in elastic state under E1 and E2 seismic load,and does not reach the yield strength.

关 键 词：山区桥梁 预应力混凝土T梁 钢混组合梁 地震响应 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]