陳蓉 侯敏 李立君
摘要: 對印尼雅萬高鐵線上超9度地震烈度區的某混凝土連續剛構橋建立有限元模型,采用反應譜分析法進行橋墩強度驗算,時程分析法進行橋墩抗剪強度驗算和極限轉角驗算。由于該工程場地的地震加速度超過中國相關規范的范圍,在利用MIDAS Civil軟件驗算分析過程中,手動輸入地震加速度和特征周期。計算結果表明,在多遇地震作用下橋梁處于彈性階段,在罕遇地震作用下橋梁進入塑性階段,計算結果均未超過規范容許值,橋梁結構滿足抗震設防要求。
Abstract: A finite element model of the concrete continuous rigid frame bridge in area with seismic intensity greater than 9 degrees on the Indonesian Jakarta-Bandung High Speed Rail is established. In this model, the response spectrum analysis is used to check the strength of the pier while the time history analysis to check the shear strength and limit corner of the pier. Due to the earthquake acceleration of this engineering exceeds the scope of Chinese code, the data of earthquake acceleration and characteristic cycle are entered by hand when using MIDAS Civil to analysis. The figures show that the bridge was maintain in the elastic stage during the frequent earthquake, but in the plastic stage when the rare earthquake occurred. All the results do not exceed the admissible value and the bridge structure satisfies the seismic fortification
關鍵詞: 連續剛構橋;地震烈度;反應譜分析;時程分析
Key words: continuous rigid frame bridge;seismic intensity;response spectrum analysis;time history analysis
中圖分類號:U442.5+5 文獻標識碼:A 文章編號:1006-4311(2018)12-0142-04
0 引言
近年來,連續剛構橋憑其適應能力強、施工方便等優點,被廣泛應用于工程實踐與運用中。一般情況下,在設計連續剛構橋時,為減小順橋向的抗推剛度,通常將橋墩設計成柔性高墩,以改善結構在地震作用下的受力性能。然而,在實際運用時,時常受到路線走向、橋梁標高等因素的影響設計為矮墩剛構橋。矮墩剛構橋抗推剛度大,柔性小,地震作用下,墩頂和墩底部位易損壞,對墩頂和墩底進行地震響應分析是結構抗震設計的要點[1],[2]。目前國內關于連續剛構橋地震響應分析的案例也有不少,常用分析方法有反應譜法與動力彈塑性時程分析法[7],[8],但設防烈度普遍未超過9度。對于設防烈度大于9度地區的工程,國內案例較少,國內規范中未給出詳細抗震設計說明,只要求對其抗震設計作專門研究[3]?!?br>