大跨度連續(xù)剛架拱橋的地震響應(yīng)研究(外文翻譯)

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中文：3600 字
英文：12900 字符

摘 要 : 廣州新光大橋是世界上第一座三跨連續(xù)鋼桁拱與鋼筋混凝土V型剛構(gòu)結(jié)合的鋼一混凝土組合體系橋梁，主橋跨度為(177 +428 + 177) m。以廣州新光大橋?yàn)槔?，研究地震?dòng)空間變化對(duì)大跨度連續(xù)剛架拱組合體系橋梁地震響應(yīng)的影響。地震空間效應(yīng)變化考慮了橋梁支點(diǎn)間橫橋向和順橋向多點(diǎn)激勵(lì)和行波效應(yīng)，研究結(jié)果表明:在不同的地震激勵(lì)下橋梁的地震響應(yīng)特征截然不同，地震動(dòng)的空間變化對(duì)主拱肋、V型剛架的影響很大，而對(duì)邊拱肋的影響相對(duì)較小;且隨著剪切波速增加，主拱頂相對(duì)拱腳的縱橋向位移逐漸減小，而邊拱拱頂?shù)目v橋向位移基本不受剪切波速的影響.

關(guān)鍵詞: 拱橋;連續(xù)剛架拱橋;地震響應(yīng);地面空間變化;多點(diǎn)激勵(lì);行波效應(yīng);有限元



Abstract: This paper investigates the spatial variability effects of ground motion on the seismic response of long-span continuous rigid-frame arch bridge. The analyses are performed on the Xinguang bridge in Guangzhou，which is the worldwide first 3-span continuous rigid-frame and steel-truss arch bridge with reinforced concrete V-shaped rigid frame. Its spans of the main bridge are as long as (177+428+177) m. The spatial variability of ground motions between pivots of the bridge is taken into account with multi-support excitation and traveling wave effect by exciting the bridge in both transverse and longitudinal directions of the bridge. New study shows the characteristics of seismic response of the critical bridge members are varied with different seismic excitations. The spatially varying ground motion has a considerable influence on the seismic responses of the ribs of the main arch and V-shaped rigid frame，whereas the influence on the side arch ribs is insignificantly predominant. As the shear wave velocity increases the peak longitudinal displacement of the crown of the main arch relative to the arch springing decreases，while，the effect of shear wave velocity on the longitudinal displacement of the ribs of the side arch can be neglected.

Key words: arch bridge; continuous rigid-frame arch bridge; seismic response; spatially varying ground motion; multi-support excitation; traveling wave effect;