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Structural Design Considering Spatial Variation of Input Seismic Motions

考虑输入地震运动空间变化的结构设计

基本信息

批准号：
12650569
负责人：
OHSAKI Makoto
金额：
$ 2.24万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

项目摘要

1. sensitivity analysis method has been developed for mean-maximum seismic responses of finite dimensional structures considering spatial variation of input motions.2. An optimum design problem has been formulated for minimizing the structural volume under constraints on mean-maximum seismic response strains. Optimum cross-sectional areas have been found for arch-type trusses and frames, It. Has been shown that the optimal structural volume increases due to quasi-static responses resulted from spatial variation of input motions3. It is important to investigate robustness of the optimal solutions against the parameters for postoptimal analysis has been presented, and the accuracy of the parametric sensitivity coefficients has been verified by the examples of arch-type frames.4. A response spectrum method has been developed for long-span structures considering soil-structure interactions, which are modeled by springs. The results have been verified by time-history analysis. Optimum designs have been found for various types of three-dimensional long-span structures, and the effect of interaction has been discussed.5. Long-span dome structures are often supported by walls. The seismic motions at the bedrock level are magnified by the soils before arriving the foundations of the structure. Therefore, it is natural to assume that the long-span roof structures are secondary structures supported by soils and boundary structures which are considered as primary structures. To extend the method developed in this study, an optimization method based on frequency-domain analysis has been presented for secondary structures.

1. 考虑输入运动的空间变化，针对有限维结构的平均-最大地震响应开发了灵敏度分析方法。2．制定了优化设计问题，以在平均最大地震响应应变的约束下最小化结构体积。已经找到了拱形桁架和框架的最佳横截面积，It。已经表明，由于输入运动的空间变化引起的准静态响应，最佳结构体积会增加。研究最优解对参数的鲁棒性对于后优化分析具有重要意义，并通过拱型框架算例验证了参数敏感度系数的准确性。 4．考虑到土壤-结构相互作用，针对大跨度结构开发了一种响应谱方法，该方法通过弹簧进行建模。结果已通过时程分析得到验证。对各类三维大跨结构进行了优化设计，并讨论了相互作用的影响。 5．大跨度的圆顶结构通常由墙壁支撑。基岩层面的地震运动在到达结构地基之前会被土壤放大。因此，很自然地假设大跨度屋顶结构是由土壤和边界结构支撑的次要结构，而边界结构被视为主要结构。为了扩展本研究中开发的方法，提出了一种基于频域分析的二级结构优化方法。