| 白凤龙,李宏男.两种典型空间结构多维多点激励下抗震分析[J].,2010,(6):990-996 |
| 两种典型空间结构多维多点激励下抗震分析 |
| Seismic analysis of two typical spatial structures under multi-dimensional and multi-support earthquake excitations |
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| DOI：10.7511/dllgxb201006027 |
| 中文关键词: 空间结构 多维多点激励 抗震分析 相干函数 |
| 英文关键词: spatial structure multi-dimensional and multi-support excitations seismic analysis coherency loss function |
| 基金项目:教育部创新团队基金资助项目(IRT0518);高等学校学科创新引智计划资助项目(B08014). |
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| 中文摘要: |
| 采用三角级数法模拟生成满足给定的相干函数和考虑三维地震分量相关性的非平稳人造地震动，基于直接输入位移法建立了地震动多维多点激励时程分析模型．选取两种典型大跨度空间结构为研究对象，分别计算分析了两种结构在地震动一维一致激励、一维多点激励和多维多点激励下的反应，并对多维多点激励下不同视波速情况引起的结构反应进行了对比分析．分析结果表明 地震动多点激励下两类结构大多数杆件的最大受力大于一致激励作用，多维多点激励下杆件内力计算结果与单维多点激励下的结果变化规律基本相似，单维多点激励给出偏于不安全的结果，不同的地震波视波速情况多维多点激励作用对大跨度结构地震反应影响很大． |
| 英文摘要: |
| Artificial non-stationary earthquake motions being compatible with the given coherency loss function and considering the correlated three-dimensional component are generated by trigonometric series method, and time history analysis model under multi-dimensional and multi-support excitations is established based on displacement direct input method. Seismic responses of two typical long-span spatial structures subjected to one-dimensional uniform excitation, one-dimensional and multi-support excitations and multi-dimensional and multi-support earthquake excitations are investigated. Furthermore, seismic responses of these structures under multi-dimensional and multi-support earthquake excitations with many cases of apparent wave velocities are comprehensively investigated and compared. The results show that the internal force responses of most bars in these two typical spatial structures under multi-support excitations are larger than those under uniform excitation. The amplitude changing of analytical results under multi-dimensional and multi-support excitations of long-span structure are close to those obtained by one-dimensional and multi-support excitations, but the latter is to give the unsafe values of the seismic responses. When different cases of seismic wave velocities are considered, responses of long-span structures change a lot under multi-dimensional and multi-support earthquake excitations. |
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