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首页> 外文期刊>Bulletin of earthquake engineering >Fragility curves for risk-targeted seismic design maps
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Fragility curves for risk-targeted seismic design maps

机译：以风险为目标的抗震设计图的脆性曲线

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Seismic design using maps based on "risk-targeting"would lead to an annual probability of attaining or exceeding a certain damage state that is uniform over an entire territory. These maps are based on convolving seismic hazard curves from a standard probabilistic analysis with the derivative of fragility curves expressing the chance for a code-designed structure to attain or exceed a certain damage state given a level of input motion, e.g. peak ground acceleration (PGA). There are few published fragility curves for structures respecting the Eurocodes (ECs, principally EC8 for seismic design) that can be used for the development of risk-targeted design maps for Europe. In this article a set of fragility curves for a regular three-storey reinforced-concrete building designed using EC2 and EC8 for medium ductility and increasing levels of design acceleration (a_g) is developed. These curves show that structures designed using EC8 against PGAs up to about 1 m/s~2 have similar fragilities to those that respect only EC2 (although this conclusion may not hold for irregular buildings, other geometries or materials). From these curves, the probability of yielding for a structure subjected to a PGA equal to a_g varies between 0.14 (ag = 0.7 m/s~2) and 0.85 (a_g = 3 m/s~2) whereas the probability of collapse for a structure subjected to a PGA equal to a_g varies between 1.7 ×10~(?7) (a_g = 0.7 m/s~2) and 1.0 ×10~(?5) (a_g = 3 m/s~2).
机译：使用基于“风险目标”的地图进行地震设计会导致每年达到或超过在整个地区内统一的某种破坏状态的可能性。这些图是基于标准概率分析中的卷积地震危险曲线和易碎性曲线的派生而得出的，这些易碎性曲线表示在给定的输入运动水平下，代码设计的结构有可能达到或超过一定的破坏状态。峰值地面加速度（PGA）。对于遵守欧洲规范（EC，主要是抗震设计的EC8）的结构，几乎没有公开的脆弱性曲线可用于开发针对欧洲的以风险为目标的设计图。在本文中，针对使用EC2和EC8设计的常规三层钢筋混凝土建筑，确定了一组易碎曲线，以实现中等延展性并提高设计加速度（a_g）。这些曲线表明，使用EC8针对PGA设计的结构高达约1 m / s〜2具有与仅考虑EC2相似的脆弱性（尽管对于不规则建筑物，其他几何形状或材料而言，此结论可能不成立）。根据这些曲线，PGA等于a_g的结构的屈服概率在0.14（ag = 0.7 m / s〜2）和0.85（a_g = 3 m / s〜2）之间变化，而a PGA等于a_g的结构在1.7×10〜（？7）（a_g = 0.7 m / s〜2）和1.0×10〜（？5）（a_g = 3 m / s〜2）之间变化。

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