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首页> 外文期刊>Bulletin of earthquake engineering >Consideration of aging and SSI effects on seismic vulnerability assessment of RC buildings
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Consideration of aging and SSI effects on seismic vulnerability assessment of RC buildings

机译：考虑老化和SSI对RC建筑物地震易损性评估的影响

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At present, the seismic vulnerability assessment of reinforced concrete (RC) buildings is made considering fixed base conditions; moreover, the mechanical properties of the building remain intact in time. In this study we investigate whether these two fundamental hypotheses are sound as aging and soil-structure interaction (SSI) effectsmight play a crucial role in the seismic fragility analysis of RC structures. Among the various aging processes, we consider the chloride-induced corrosion based on probabilistic modeling of corrosion initiation time and corrosion rate. Different corrosion aspects are considered in the analysis including the loss of reinforcement cross-sectional area, the degradation of concrete cover and the reduction of steel ultimate deformation. SSI is modeled by applying the direct onestep approach, which accounts simultaneously for inertial and kinematic interactions. Twodimensional incremental dynamic analysis is performed to assess the seismic performance of the initial uncorroded (t = 0 years) and corroded (t = 50 years) RC moment resisting frame structures, having been designed with different seismic code levels. The time-dependent fragility functions are derived in terms of the spectral acceleration at the fundamental mode of the structure S_a(T_1, 5%) and the outcropping peak ground acceleration for the immediate occupancy and collapse prevention limit states. Results show an overall increase in seismic vulnerability over time due to corrosion highlighting the important influence of deterioration due to aging effects on the structural behavior. Moreover, the consideration of SSI and site effects may significantly alter the expected structural performance leading to higher vulnerability values.
机译：目前，钢筋混凝土建筑物的地震易损性评估是在固定基础条件下进行的。此外，建筑物的机械性能会及时保留。在这项研究中，我们研究了这两个基本假设是否成立，因为老化和土壤-结构相互作用（SSI）效应可能在RC结构的地震脆性分析中起关键作用。在各种老化过程中，我们基于腐蚀起始时间和腐蚀速率的概率模型来考虑氯化物引起的腐蚀。分析中考虑了不同的腐蚀方面，包括钢筋截面积的损失，混凝土表层的退化和钢极限变形的减少。 SSI通过应用直接一步法建模，该方法同时考虑了惯性和运动学相互作用。进行了二维增量动力分析，以评估最初的未腐蚀（t = 0年）和腐蚀（t = 50年）RC抗震框架结构的抗震性能，这些抗震框架结构设计为不同的地震规范。随时间变化的脆弱性函数是根据结构S_a（T_1，5％）的基本模式下的频谱加速度和针对立即占用和防止塌陷极限状态的露头峰值地面加速度得出的。结果表明，随着时间的推移，由于腐蚀引起的地震脆弱性总体上有所增加，突显了老化效应对结构性能造成的劣化的重要影响。此外，对SSI和站点影响的考虑可能会显着改变预期的结构性能，从而导致更高的漏洞价值。

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