吉林大学学报(工学版) ›› 2024, Vol. 54 ›› Issue (5): 1355-1367.doi: 10.13229/j.cnki.jdxbgxb.20220845
• 交通运输工程·土木工程 • 上一篇
Chang-jiang SHAO1,2(),Hao-meng CUI1,Qi-ming QI1,Wei-lin ZHUANG1,2
摘要:
为提升高烈度近断层地区大跨轻柔拱桥的纵向抗震性能,通过非线性时程分析,探讨了某上承式RC拱桥黏滞阻尼器的适用性。对比该新型拱桥与常规RC拱桥结构体系、动力特性的差异,明确了其地震损伤路径,优化了阻尼器布置方案,探究了近远断层地震动下墩柱响应规律及减震效果,考虑了高阶振型的影响,结合易损性说明了减震方案的合理性。结果表明:此类轻柔拱桥在近断层纵竖向设计地震下,中等高度立柱最易损伤,而拱肋保持弹性;在桥台及高柱处布置阻尼器的减震效果最佳;受高阶振型影响,设置阻尼器后的高墩柱墩身剪力及弯矩包络“S”形分布更显著;在近场脉冲及远场长周期地震下的结构响应更大,受位移脉冲的影响阻尼器滞回环会出现突变,但耗能显著、减震效果突出;4类近远场地震动下黏滞阻尼器均可有效降低拱桥墩柱的损伤概率,适用性较优,但需满足大出力、大量程的地震需求。
中图分类号:
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