【摘要】 文章研究了橡胶混凝土对钢管橡胶混凝土(RuCFST)拱桥抗震性能的影响。通过建立RuCFST拱桥的有限元模型,针对不同的橡胶含量对拱桥进行了模态和非线性动力时程分析,并基于变形-能量的双重破坏准则给出了拱肋地震破坏指数DI的计算公式,对拱桥进行了地震作用下的破坏评估。分析结果表明:钢管橡胶混凝土拱肋使拱桥的自振频率降低;在地震反应中,钢管受力增大,而核心橡胶混凝土受力减小;在0.2g加速度峰值的地震作用下,拱肋混凝土为NC、RuC5和RuC15时拱肋的破坏指数分别为0.156、0.145和0.170,拱肋混凝土橡胶含量为5%时拱桥的抗震性能较好。更多还原

【Abstract】 The effects of rubberized concrete on seismic performance of RuCFST arch bridge were studied in this paper.By establishing the finite element model of RuCFST arch bridge,Modal and nonlinear dynamic time-history analysis of different rubber content were carried out. Calculation formulas of the damage index of arch ribs were given based on the dual-damage criterion of deformation and energy. The damage was assessed under earthquake by the formulas. The results show that the natural vibration frequency of the arch bridge is reduced by the rubber concrete filled steel tube arch rib.The stress of steel tube in the earthquake response increases while rubberized concrete decreases. The damage index of NC,RuC5 and RuC15 arch ribs is 0.156,0.145 and 0.170 under earthquake with peak acceleration of 0.2 g respectively,and the arch rib with rubber content of 5% has better seismic performance.更多还原