东南大学学报（自然科学版）
東南大學學報（自然科學版）
동남대학학보（자연과학판）
JOURNAL OF SOUTHEAST UNIVERSITY
2015年
3期
557-562
,共6页
桥梁工程%多点激励位移输入%跨断层桥梁%基线校正
橋樑工程%多點激勵位移輸入%跨斷層橋樑%基線校正
교량공정%다점격려위이수입%과단층교량%기선교정
bridges engineering%multi-support displacement input%bridges crossing fault%baseline correction
探讨了多点激励位移输入模型对跨断层桥梁的适用性，并针对包含永久地面位移的时程曲线在基线校正过程中存在的问题提出了一种改进的基线修正方法。利用该方法对集集地震中距发震断层最近的10个强震台站地震动记录进行基线校正，校正后的永久地面位移与GPS测站同震位移运动方向一致，数值相近，由此验证了该方法的合理性，所得位移时程曲线可作为多点激励位移输入模型的地震动输入。以某跨断层桥梁为例，分别采用多点激励位移输入模型和多点激励加速度输入模型计算结构地震响应。结果表明，基于多点激励位移输入模型的地震动输入方法能够真实模拟断层错动引起的结构残余变形与内力，符合实际震害特征；而基于多点激励加速度输入模型的地震动输入方法则未考虑该残余变形与内力，故可能导致不合理的计算结果。
探討瞭多點激勵位移輸入模型對跨斷層橋樑的適用性，併針對包含永久地麵位移的時程麯線在基線校正過程中存在的問題提齣瞭一種改進的基線脩正方法。利用該方法對集集地震中距髮震斷層最近的10箇彊震檯站地震動記錄進行基線校正，校正後的永久地麵位移與GPS測站同震位移運動方嚮一緻，數值相近，由此驗證瞭該方法的閤理性，所得位移時程麯線可作為多點激勵位移輸入模型的地震動輸入。以某跨斷層橋樑為例，分彆採用多點激勵位移輸入模型和多點激勵加速度輸入模型計算結構地震響應。結果錶明，基于多點激勵位移輸入模型的地震動輸入方法能夠真實模擬斷層錯動引起的結構殘餘變形與內力，符閤實際震害特徵；而基于多點激勵加速度輸入模型的地震動輸入方法則未攷慮該殘餘變形與內力，故可能導緻不閤理的計算結果。
탐토료다점격려위이수입모형대과단층교량적괄용성，병침대포함영구지면위이적시정곡선재기선교정과정중존재적문제제출료일충개진적기선수정방법。이용해방법대집집지진중거발진단층최근적10개강진태참지진동기록진행기선교정，교정후적영구지면위이여GPS측참동진위이운동방향일치，수치상근，유차험증료해방법적합이성，소득위이시정곡선가작위다점격려위이수입모형적지진동수입。이모과단층교량위례，분별채용다점격려위이수입모형화다점격려가속도수입모형계산결구지진향응。결과표명，기우다점격려위이수입모형적지진동수입방법능구진실모의단층착동인기적결구잔여변형여내력，부합실제진해특정；이기우다점격려가속도수입모형적지진동수입방법칙미고필해잔여변형여내력，고가능도치불합리적계산결과。
The applicability of the multi-support displacement input model in bridges crossing fault ( BCF) is discussed, and an improved baseline correction method is proposed to solve the problem in the process of baseline correction to ground motion time history containing the permanent ground dis-placements.By using this method, the ground motion records of the nearest 10 strong motion sta-tions in the Chi-Chi earthquake are corrected.The directions of the corrected permanent ground dis-placements and the co-seismic of GPS stations are the same, and the values are similar, which proves the rationality of the improved method.The displacement time history can be used as the ground motion input of the multi-support displacement input model.A BCF is taken as an example, and the seismic responses of the structures are calculated by using the multi-support excitation dis-placement input model and the multi-support excitation acceleration input model.The results show that by using the earthquake motion input method based on the multi-support displacement input model, the residual deformation and internal force of the structures caused by fault dislocation can be truely reflected and the calculation results match with the actual characteristics of seismic damage. However, without considering the residual deformation and internal force, the earthquake motion in-put method based on the multi-support excitation acceleration input model may lead to unreasonable results.
