ABSTRACT

This paper investigates a novel mid-rise large-span cassette structure. The unique limit state divisions of the cassette structure are studied by following the probabilistic seismic capacity analysis (PSCA) method. A numerical model is established and verified through the use of shake table test results. Multidirectional pushover analyses is performed, and the directional effect of the 3D cassette structure is considered. The uncertainty present in fourteen major structural parameters is also considered in the modelling by using Latin hypercube sampling (LHS). The probability density function (PDF), cumulative distribution function (CDF), coefficient of variability (COV) and PSCA curves are obtained. The probabilistic distributions of the PSCA curves suggest that the threshold values of the maximum storey drift ratios of the large-span cassette are 1/550, 1/200, 1/60, and 1/25 for the slight damage (SD), moderate damage (MD), extensive damage (ED) and complete damage (CD) limit states, respectively. Furthermore, the average median values and logarithmic standard deviations are also given for the further probabilistic seismic fragility analysis and structural assessment performed. Finally, sensitivity analyses are conducted to examine the effects of critical structural parameters on structural damage measures. The results show that the structural performance is more sensitive to material parameters than load parameters.

摘要

本文研究了一种新型中层大跨度盒式结构。采用概率抗震能力分析（PSCA）方法研究了盒式结构的独特极限状态划分。利用振动台试验结果建立并验证了数值模型。进行了多向推覆分析，并考虑了 3D 盒结构的方向效应。通过使用拉丁超立方抽样 (LHS)，在建模中还考虑了十四个主要结构参数中存在的不确定性。获得概率密度函数（PDF）、累积分布函数（CDF）、变异系数（COV）和PSCA曲线。PSCA 曲线的概率分布表明，大跨度盒式磁带的最大楼层漂移比阈值分别为 1/550、1/200、1/60 和 1/25，轻度损坏（SD），中度分别为损伤（MD）、广泛损伤（ED）和完全损伤（CD）极限状态。此外，还给出了进一步概率地震脆弱性分析和结构评估的平均中值和对数标准差。最后，进行敏感性分析以检查关键结构参数对结构损坏措施的影响。结果表明，结构性能对材料参数比载荷参数更敏感。分别为广泛损坏 (ED) 和完全损坏 (CD) 极限状态。此外，还给出了进一步概率地震脆弱性分析和结构评估的平均中值和对数标准差。最后，进行敏感性分析以检查关键结构参数对结构损坏措施的影响。结果表明，结构性能对材料参数比载荷参数更敏感。分别为广泛损坏 (ED) 和完全损坏 (CD) 极限状态。此外，还给出了进一步概率地震脆弱性分析和结构评估的平均中值和对数标准差。最后，进行敏感性分析以检查关键结构参数对结构损坏措施的影响。结果表明，结构性能对材料参数比载荷参数更敏感。