超宽桥的地震反应分析及优化设计

发布时间：2018-02-22 09:07

本文关键词： 超宽桥梁格法抗震性能优化设计　出处：《地震工程与工程振动》2014年02期 　论文类型：期刊论文

【摘要】：随着超宽桥在城市建设中的广泛应用,超宽桥的抗震性能研究显得十分重要。文章首先对超宽桥抗震分析建模方法的适用性进行对比分析,并根据全桥动力性能特点对超宽桥进行了界定;然后,根据对普通宽度桥梁和超宽桥的地震反应特点进行研究,指出了超宽桥在地震作用下的受力薄弱环节;最后,通过改变桥墩布置形式、墩间横向连接以及横向支座约束方式等措施对超宽桥结构进行优化分析,提出了提升超宽桥抗震性能的设计对策。研究结果表明:从抗震性能角度,可将宽跨比大于等于1的桥梁界定为超宽桥;相对于梁单元模型,采用梁格模型能够较好地模拟超宽桥刚度分布的空间效应;由于超宽桥在横向地震作用下支座的反力和剪力较大且分布严重不均匀,容易出现横向倾覆的危险,应将横桥向作为其抗震设计的重点;为提高超宽桥抗震性能,宜采用多柱式桥墩,并适量增加横向约束支座和墩间横向连接以增加桥梁的横向刚度,使得桥墩内力的分布更为均匀、合理。
[Abstract]:With the wide application of ultra-wide bridges in urban construction, it is very important to study the seismic performance of ultra-wide bridges. According to the dynamic characteristics of the whole bridge, the ultra-wide bridge is defined. Then, based on the study of the seismic response characteristics of the ordinary width bridge and the ultra-wide bridge, the weak link of the ultra-wide bridge under the earthquake action is pointed out. By changing the layout of piers, the transverse connection between piers and the constraint mode of transverse support, the design countermeasures for the seismic performance of super-wide bridges are put forward. The results show that: from the point of view of seismic performance, Compared with the beam element model, the beam-lattice model can be used to simulate the spatial effect of the stiffness distribution of the super-wide bridge. Because the reaction force and shear force of the support under the action of transverse earthquake is large and the distribution is serious and uneven, it is easy to appear the danger of lateral overturning, so the transverse direction of the bridge should be regarded as the key point of seismic design, in order to improve the seismic performance of the super-wide bridge, In order to increase the lateral stiffness of the bridge, the multi-column pier should be adopted, and the transverse connection between the lateral restrained support and the pier should be increased in order to make the distribution of the internal force of the pier more uniform and reasonable.
【作者单位】：南京工业大学土木工程学院;
【基金】：江苏省交通科研项目(2012Y11) 国家自然科学基金项目(51178220)
【分类号】：U442.55

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