摘要
调查了306省道、310国道以及川亭公路上位于地震烈度8度和7度区的桥梁。GS.N0028台站记录到的大河家镇加速度峰值超过900 cm/s~2,远超当地罕遇地震设防标准,但从调查的结果看,本次地震中,8度区的桥梁震害主要以轻微破坏为主,包括挡块破坏、主梁侧移和支座滑移,除了川亭公路上发现一桥梁的桥墩出现剪切裂缝外,其他桥梁未发现主体结构发生破坏。7度区的桥梁基本完好,橡胶支座中橡胶有变形无法恢复以及主梁位移导致挡块间距发生变化,但都不影响功能。混凝土挡块作为主梁防侧移装置,震害虽然表明其有效性,但缺乏快速恢复的特性,同时设置缓冲橡胶垫的挡块仍然发生了较严重的破坏,因此,以后需要进一步加强挡块的缓冲装置和考虑可快速恢复性能的研究。
This article mainly presents the investigation of bridges located in seismic intensity 8 degree and 7 degree zones on 306 Provincial Road,310 National Road and Chuanting Highway.Peak acceleration of over 900 cm/s~2 was recorded at station GS.N0028 in the town of Dahejia,far exceeding the local rare earthquake fortification standard.However,the investigation results show that the bridges in the intensity 8 degree zone were mainly slightly damaged,including restrainer damage,lateral displacement of the main girder and bearing sliding,except for one bridge on Chuanting Highway where shear cracks were found in the pier,no other bridge in this area was found that suffered main structural damage.Bridges in the intensity 7 degree zone were basically intact,with some rubber deformations and unrecoverable displacements in the rubber bearings,as well as changes in the distance between restrainers.Fortunately,these issues did not affect their functionality.Concrete restrainer,as a measure to prevent lateral displacement of the main beam,has shown effectiveness in seismic damage,and is lack of rapid recovery characteristics.At the same time,the restrainer that installed cushion rubber pad also suffered severe damage,therefore,improving the cushioning device and considering the quick recovery of performance are needed in the future studies.
作者
孙得璋
彭宇轩
余世舟
闫培雷
张昊宇
黄勇
聂桂波
SUN Dezhang;PENG Yuxuan;YU Shizhou;YAN Peilei;ZHANG Haoyu;HUANG Yong;NIE Guibo(Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin 150080,China)
出处
《地震工程与工程振动》
CSCD
北大核心
2024年第2期224-232,共9页
Earthquake Engineering and Engineering Dynamics
基金
国家自然科学基金项目(51678544)。
关键词
积石山地震
大河家黄河大桥
挡块破坏
支座滑移
桥台震害
Jishishan earthquake
Dahejia Yellow River Bridge
restrainer damage
bearing sliding
seismic damage of abutment
作者简介
孙得璋(1982-),男,副研究员,博士,主要从事桥梁抗震、桥梁减隔震研究。E-mail:sundz@iem.ac.cn;通讯作者:彭宇轩(2000-),女,硕士研究生,主要从事桥梁抗震、桥梁减隔震研究。E-mail:ppp112517219@163.com。
