本文關鍵詞：匝道橋地震響應影響要素分析　出處：《橋梁建設》2015年04期 　論文類型：期刊論文

  更多相關文章： 匝道橋 橋墩 跨徑組合 縱坡 曲率半徑 地震動輸入方向 有限元法 地震響應分析

【摘要】：為探求匝道橋幾何非規(guī)則性對結構地震響應的影響規(guī)律,基于嘉閔線匝道橋,采用SAP 2000軟件建立結構有限元分析模型,分析不同跨徑組合、縱坡、曲率半徑和地震動輸入方向下的匝道橋地震響應。結果表明:與簡支梁橋相比,多跨連續(xù)梁橋順橋向固定墩、橫橋向矮墩和過渡墩的響應均變大;縱坡大小對橋梁縱向地震響應影響輕微,但在橫橋向設置大縱坡可減小高墩區(qū)墩柱的地震響應;小曲率半徑下采用切向或法向輸入與地震動最不利輸入方向存在角度偏差,會低估結構地震響應,大曲率半徑下其地震響應與直線橋基本一致,可簡化為直線橋進行分析。
[Abstract]:In order to find out the influence of geometrical irregularity of ramp bridge on structural seismic response, based on the ramp bridge of Jia-min line, the finite element analysis model of structure is established by using SAP 2000 software, and different span combinations and longitudinal slopes are analyzed. The seismic response of ramp bridge with curvature radius and ground motion input direction is obtained. The results show that compared with simply supported beam bridge, the response of multi-span continuous beam bridge in the direction of fixed pier, cross bridge pier and transition pier becomes larger. The longitudinal slope size has a slight effect on the longitudinal seismic response of the bridge, but setting a large longitudinal slope in the transverse direction of the bridge can reduce the seismic response of the pier column in the high pier area. The angle deviation between the tangential or normal input and the most unfavorable input direction of ground motion under the small radius of curvature will underestimate the seismic response of the structure, and the seismic response of the large curvature radius is basically the same as that of the linear bridge. It can be simplified as a straight line bridge for analysis.
【作者單位】： 上海理工大學環(huán)境與建筑學院;同濟大學土木工程防災國家重點實驗室;
【基金】：國家自然科學基金項目(51408359,51378384)~~
【分類號】：U448.17;U442.55
【正文快照】： 1引言匝道橋常具有小曲率半徑、大縱坡、樁數(shù)布置較少等特點[1],這使得匝道橋在平面和立面布置上,都有很強的非規(guī)則性,導致其地震響應區(qū)別于常規(guī)橋梁,在地震中易遭到損壞。如美國SR14/I5立交樞紐在建成前后的2次大地震中均發(fā)生局部垮塌,切斷下行線路交通;汶川地震中,百花大橋

【參考文獻】

相關期刊論文 前7條

1 王東升;孫治國;李曉莉;霍q，

本文編號：1422044