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首页> 外文期刊>Advances in Structural Engineering >Seismic collapse assessment of double-layer barrel vault roofs with double-layer vertical walls
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Seismic collapse assessment of double-layer barrel vault roofs with double-layer vertical walls

机译：双层竖壁双层筒形穹顶屋面的地震倒塌评估

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Double-layer barrel vault roofs with double-layer vertical walls are frequently used as a structural system for highly important public buildings; therefore, their seismic design needs special considerations. In this article, the seismic collapse behavior of these structures, used as a lateral load-resisting system, is evaluated by carrying out incremental dynamic analysis. For this purpose, different rise-to-span and height-to-span ratios are considered for the roofs and the walls, respectively. The structures are first designed in accordance with Iranian design codes and then they are modeled in OpenSees. The material and geometric nonlinearities are considered in the analyses, including the buckling response of the compression members. At the next stage, the models are subjected to incremental dynamic analysis and their median collapse capacities are extracted. Collapse margin ratios of various structures are finally derived, following FEMA-P695 methodology, and compared against the established acceptable limits. The obtained results show that collapse of the structures occurs mainly due to the buckling-mode failure of the roof. The collapse performance of the structures with large rise-to-span ratio of roofs and large height-to-span ratio of walls is unacceptable.
机译：具有双层垂直壁的双层桶形金库屋顶通常用作高度重要的公共建筑的结构系统。因此，其抗震设计需要特别考虑。在本文中，通过进行增量动力分析，评估了这些结构的抗地震倒塌性能（用作侧向抗力系统）。为此，分别针对屋顶和墙壁考虑不同的升跨比和高跨度比。首先根据伊朗设计规范设计结构，然后在OpenSees中对其进行建模。分析中考虑了材料和几何非线性，包括压缩构件的屈曲响应。在下一阶段，对模型进行增量动态分析，并提取其中值坍塌能力。最终，按照FEMA-P695方法得出各种结构的塌陷率，并与确定的可接受极限进行比较。获得的结果表明，结构的崩溃主要是由于屋顶的屈曲模式破坏引起的。屋顶的高跨度比大，墙的高跨度比大的结构的倒塌性能是不可接受的。

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