Response of long-span bridges to spatially varying ground motion
Response of long-span bridges to spatially varying ground motion
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DOI：
10.1061/(asce)0733-9445(1996)122:5(476
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发表时间：
1996-05-01
期刊：
影响因子：
--
通讯作者：
Sweidan, BN
中科院分区：
文献类型：
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作者：
Harichandran, RS;Hawwari, A;Sweidan, BN
介绍了金门悬索桥、新河峡谷和冷泉峡谷桥面拱桥对一般空间变化地震地面运动 (SVEGM) 模型的静态和瞬态响应分析结果。将结果与使用相同激励和延迟激励计算的响应进行比较。对于这些大跨度桥梁，使用相同的激励通常是不可接受的，而使用延迟激励仅对于短拱桥的纵向响应是可接受的。令人惊讶的是，对于滤波后的 Kanai-Tajami 激励功率谱，悬索桥中心跨的瞬态横向位移显着超过相应的静态位移；因此，该谱可能不适合分析非常灵活的结构。我们发现 SVEGM 对静态力响应和瞬态力响应的定性影响是相似的。
Results Of stationary and transient response analyses of the Golden Gate suspension bridge, and the New River Gorge and Cold Spring Canyon deck arch bridges, to a general spatially varying earthquake ground motion (SVEGM) model are presented. The results are compared with responses computed using identical and delayed excitations. The use of identical excitations is in general unacceptable for these long-span bridges, and the use of delayed excitations is acceptable only for the longitudinal response of short arch bridges. Surprisingly, the transient lateral displacements of the suspension bridge center span significantly overshoot the corresponding stationary displacements for the filtered Kanai-Tajami excitation power spectrum; this spectrum may therefore be unsuitable for analyzing very flexible structures. The qualitative effects of SVEGM on stationary and transient force responses are found to be similar.