钢管混凝土拱桥地震破坏模糊评估方法

为了掌握钢管混凝土拱桥在地震后损伤和破坏情况，根据钢管混凝土拱桥各部件结构构造和受力特征，建立各个部件的杆件的基于变形或强度和能量的双重破坏评估模型，利用有限元法计算钢管混凝土拱桥非线性地震反应，研究基于模糊理论和层次分析法的地震破坏模糊评估方法。通过一座大跨钢管混凝土拱桥工程应用，由钢管混凝土拱桥的地震破坏模糊评估可知，在加速度峰值为0.1、0.2、0.4和0.8 g的地震作用下，整桥的破坏指数分别为0.150、0.152、0.172和0.318，说明在峰值为0.4 g的地震作用下桥梁为轻微破坏，在0.8 g的地震作用下，为中等破坏。

Fuzzy Assessment Method for Seismic Damage of CFST Arch Bridges

In order to investigate the conditions of damage and failure of concrete-filled steel tube(CFST) arch bridges, considering the structural and mechanical characteristics of CFST arch bridges, the dual damage criteria assessment models of the various components based on deformation or strength and energy were developed. The nonlinear seismic response of CFST arch bridges was analyzed by finite element method and the fuzzy evaluation method of seismic damage based on fuzzy theory and analytic hierarchy process was studied. Finally, taking a long-span CFST arch bridge as example, the damage index of the bridge was 0.150, 0.152, 0.172 and 0.318 respectively when the seismic peak acceleration was respectively 0.1g, 0.2g, 0.4g and 0.8g. The results show that the CFST arch bridge is slightly damaged under the earthquake when the seismic peak acceleration is 0.4g, and the bridge is damaged moderately when the peak acceleration is 0.8g.