章李刚, 楼文娟. 大型空间桁架结构多目标等效静力风荷载[J]. 工程力学, 2013, 30(8): 148-154. DOI: 10.6052/j.issn.1000-4750.2012.05.0313
引用本文: 章李刚, 楼文娟. 大型空间桁架结构多目标等效静力风荷载[J]. 工程力学, 2013, 30(8): 148-154. DOI: 10.6052/j.issn.1000-4750.2012.05.0313
ZHANG Li-gang, LOU Wen-juan. EQUIVALENT STATIC WIND LOAD FOR MULTIPLE TARGETS OF LARGE-SCALE SPACE TRUSS STRUCTURE[J]. Engineering Mechanics, 2013, 30(8): 148-154. DOI: 10.6052/j.issn.1000-4750.2012.05.0313
Citation: ZHANG Li-gang, LOU Wen-juan. EQUIVALENT STATIC WIND LOAD FOR MULTIPLE TARGETS OF LARGE-SCALE SPACE TRUSS STRUCTURE[J]. Engineering Mechanics, 2013, 30(8): 148-154. DOI: 10.6052/j.issn.1000-4750.2012.05.0313

大型空间桁架结构多目标等效静力风荷载

EQUIVALENT STATIC WIND LOAD FOR MULTIPLE TARGETS OF LARGE-SCALE SPACE TRUSS STRUCTURE

  • 摘要: 空间桁架体系不仅具有典型大跨屋盖结构风致响应多模态参与性及特征响应多样性等特点,其在脉动风荷载激励下结构不同部位的风致响应还存在有大量的正负号交替现象。针对以上特性,在分析了单目标等效风荷载不足和局限性的基础上,提出了一种新的多目标等效风荷载计算方法。在该方法中,不仅采用本征正交分解 (POD)法基本原理有效解决了多目标脉动响应极值间的正负号组合问题,寻找出一种在一定程度上最为可能的目标响应分布形式;同时以保证结构关键位置的风致响应为目标,提出了多目标等效风荷载的精确求解方式。最后以杭州新火车东站站台屋盖结构为工程实例,证明了采用该方法得到的多目标等效风荷载不仅能够精确保证关键部位响应与实际结果高度一致,其他非关键部位结果也有一定的精确性。

     

    Abstract: Like the typical long-span roof structures, the space truss structure has the multi-modal participatory and characteristic response diversity in its wind-induced responses, moreover, its wind-induced responses have a large number of sign alternations. Recognizing the shortage and limitations of the equivalent wind load for single target, this paper proposes a new approach of the multi-targets equivalent wind load. In this approach, the sign combination problem of the pulse extreme response for the multi-targets was effectively resolved with the proper orthogonal decomposition (POD) method, and to some extent, the most likely distribution of the target responses was sought out. Meanwhile, for the purpose of ensuring the wind-induced response occurring at the key locations, the exact solution of the equivalent wind load for multiple targets was raised. Taking the platform of the new Hangzhou east railway station as an example, it was proved that the equivalent wind loads for multiple targets obtained by the proposed approach can not only ensure that the responses in key parts are highly consistent with the actual results but also keep other results in non-critical parts a certain accuracy.

     

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