虛擬激勵法在自錨式懸索橋豎向地震反應分析中的應用

注意：本論文已在《東南大學學報(自然科學版)》 2003, 33(4):522～525上發表
使用者請注明論文出處
劉春城　張哲　石磊
(大連理工大學橋梁工程研究所,大連116023)

摘要：考慮壓、彎耦合效應,建立了自錨式懸索橋的豎向地震動方程,并利用虛擬激勵法來求解,由于虛擬激勵法自動計及了參振振型的互相關項和激勵之間的互相關項,是快速精確的ＣＱＣ算法.文中以蘭旗松花江混凝土自錨式懸索橋為例,計算了主梁、主塔和主纜的期望峰值響應,并對地震動空間效應對自錨式懸索橋的豎向地震反應影響規律作了詳細的討論.
關鍵詞：虛擬激勵;自錨式懸索橋;豎向地震反應;空間效應;壓彎耦合

Application of pseudo excitation method to vertical seismic response analysis of self-anchored suspension bridges
Liu Chuncheng, Zhang Zhe, Shi Lei
(Bridge Engineering Institute, Dalian University of Technology, Dalian, 116023, China)

Abstract: The vertical seismic dynamic equation of self-anchored suspension bridges is presented by taking into account coupling effect of axial and flexural action, and pseudo excitation method is utilized to solve this equation. Because the method is highly efficient and involves the necessary cross-correlation terms both  between the participant modes and between the excitations, it is a fast and exact CQC (complete quadratic combination) algorithm. The expected peak responses of main beam, towers and cables of Lanqi Song Hua River concrete self-anchored suspension bridge are investigated, and the spatial variation effect on vertical seismic response of self-anchored suspension bridge are detailed.
Key words: pseudo excitation; self-anchored suspension bridge; vertical seismic response; spatial variation effect; coupling of axial and flexural action

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