基于改进物元可拓模型的木结构古建筑地震风险评估

Seismic Risk Assessment of Ancient Timber Structures Based on Improved Matter-element Extension Model

为准确预测木结构古建筑在地震下的风险等级,结合地震破坏特点和木结构古建筑结构特性,选取致灾因子危险性、孕灾环境敏感性、承灾体脆弱性为特征的22项评估指标,利用改进物元可拓模型建立了木结构古建筑地震风险评估模型。该模型以贴近度代替关联度,提高了评估结果的准确性。运用该模型对某木结构古建筑在不同地震动水平下的地震风险进行评估。结果表明,该木结构古建筑在遭遇地震动峰值加速度为0.05g、0.10g和0.20g的地震作用时,为中等风险;当遭遇到0.40g的地震作用时变为较高风险。

In order to accurately predict the risk level of ancient timber structures under earthquake, 22 evaluation indexes were selected, including hazard of disaster-causing factors, susceptibility assessment of disaster environment, and vulnerability of disaster-bearing body, combined with seismic damage characteristics and structural characteristics of ancient timber structures, and an earthquake risk assessment model was established by using the improved matter-element extension model.In this model, closeness degree is used instead of correlation degree, which improves the accuracy of evaluation results.This model was used to evaluate the risk of an ancient timber structure under different ground motion levels.The results show that the ancient timber structure is at moderate risk when the peak acceleration of ground motion is 0.05g, 0.10g, and 0.20g, and when it encounters earthquakes with peak ground accelerations of 0.40g, it becomes at a higher risk.