某四塔斜拉桥不同约束体系的动力特性研究

发布时间：2018-01-16 04:30

本文关键词：某四塔斜拉桥不同约束体系的动力特性研究　出处：《华南地震》2016年04期 　论文类型：期刊论文

【摘要】：依托于琼州海峡大桥的四塔斜拉桥设计方案,研究了在不同塔梁连接方式下结构的自振特性和地震作用下的弹性反应。根据地震分析结果,发现不同频谱特性的地震波对各约束体系影响不同,从而可能会得出不一致的结论。就一般意义而言,全漂浮体系动力性能优于半漂浮体系,而与约束体系相比,其主梁和边塔顶纵向位移都明显更大;全约束体系的抗震性能优于局部约束体系,且对主梁纵向位移约束最强,但与漂浮体系相比其桥塔内力和主梁竖向挠曲都更大。
[Abstract]:Based on the design scheme of the four-tower cable-stayed bridge of Qiongzhou Strait Bridge, the natural vibration characteristics of the structure and the elastic response under the earthquake action are studied under the different connection modes of the tower and beam. It is found that the seismic waves with different spectral characteristics have different effects on each confined system, which may lead to inconsistent conclusions. In general, the dynamic performance of the whole floating system is better than that of the semi-floating system. Compared with the restraint system, the longitudinal displacement of the main beam and the top of the side tower is obviously larger. The seismic behavior of the fully confined system is better than that of the locally confined system, and the longitudinal displacement of the main beam is the strongest, but compared with the floating system, the internal force of the bridge tower and the vertical deflection of the main beam are larger than those of the floating system.
【作者单位】：广州大学工程抗震研究中心;
【基金】：广州市科技计划项目(2013Y2-00054)
【分类号】：U448.27
【正文快照】： 图1琼州海峡大桥方案动力分析模型Fig.1 Dynamic analysis model of Qiongzhou Strait Bridge program0引言多塔或多跨斜拉桥具有跨越能力强、造价低(与大跨度悬索桥相比)、外形美观等优点,近年来在实际工程中得到了广泛应用[1],并成为众多大型通道计划中极具考虑价值的结构跨

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