地震波入射角对异形斜交梁桥减隔震性能的影响  

Study on the influence of seismic wave incidence angle on seismic isolation performance of special-shaped skew beam bridge

作　　者：曹锋[1] 马鹏 靳威燕 Cao Feng;Ma Peng;Jin Wei-yan(School of Civil and Transportation Engineering,Qinghai Nationalities University,Xining 810007,China;China CSCEC AECOM Consultants Co.Ltd.Lanzhou 730000,China)

机构地区：[1]青海民族大学土木与交通工程学院,青海西宁810007 [2]中国市政工程西北设计研究院有限公司,甘肃兰州730000

出　　处：《工程抗震与加固改造》2021年第6期88-95,共8页Earthquake Resistant Engineering and Retrofitting

基　　金：青海民族大学校级规划一般项目(2020XJGH07)。

摘　　要：随着城市桥梁发展,城市立交匝道上异形斜交梁桥大量增加。为了研究高烈度地区异形斜交连续梁桥减隔震问题,以甘肃(天水)国际陆港城陆港大道上异形斜交梁桥为研究对象,采用非线性时程分析方法,研究地震波入射角对普通橡胶支座和SHDR支座(SHDR)地震反应的影响。结果表明:采用SHDR支座后,活动墩分担了较大的地震力,固定墩墩底弯矩和墩顶位移反应显著减小;异形中墩斜交梁地震反应受地震波入射角的影响较大,工程设计中应充分考虑地震波入射角的影响,正交墩和斜交墩最大最小内力发生在2倍斜交角入射地震波和1/2~2/3斜交角入射地震波作用下,采用普通支座和SHDR支座时最大最小内力发生入射角也不相同,这与普通的直线正交梁桥显著不同,设计时应予以考虑。With the development of urban bridges, there has been a large increase in irregularly-shaped oblique beam bridges on urban overpass ramps. For the problem of seismic isolation and isolation of irregularly-shaped oblique continuous beam bridges in high-intensity areas, the special-shaped oblique beam on Lugang Avenue, Gansu(Tianshui) International Land Port City Cross-beam bridge is the research object, and nonlinear time-history analysis method is used to study the influence of seismic wave incident angle on the seismic response of ordinary rubber bearings and SHDR bearings(SHDR). The results show that with the use of SHDR bearings, the movable piers share a greater seismic force, the bending moment of the fixed pier bottom and the displacement response of the pier top are significantly reduced;the seismic response of the oblique beam of the special-shaped middle pier is greatly affected by the incident angle of the seismic wave, The engineering design should fully consider the impact of the seismic wave incidence angle. The maximum and minimum internal forces of the orthogonal pier and the oblique cross pier occur under the action of 2 times the oblique angle of the incident seismic wave and the 1/2~2/3 oblique angle of the incident seismic wave, and ordinary bearings are used. The incident angle of the maximum and minimum internal forces is different from the SHDR bearing. This is different from the ordinary straight-line orthogonal beam bridge. These working conditions should be considered when designing.

关 键 词：地震波入射角 异形斜交连续梁桥 SHDR支座 减隔震分析 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]