连续梁桥防屈曲支撑设计及抗震性能研究

发布时间：2018-05-15 05:01

本文选题：防屈曲支撑 + 连续梁桥　；参考：《苏州科技大学》2017年硕士论文

【摘要】：新的建筑抗震设计规范提高了部分地区的抗震设防烈度,对已建的建筑物的抗震性能提出了新的要求。而桥梁作为一种重要的交通枢纽,在抢险救灾的过程中具有举足轻重的作用,因此提高桥梁的抗震性能成为了人们的研究热点问题。防屈曲支撑是一种新型的耗能减震构件,具有优先于主体结构率先屈服、承载力高、力学性能稳定等优点,被广泛应用在高层建筑结构中,但在桥梁中的应用并不多。为此,本文率先提出了防屈曲支撑在连续梁桥中双向安置的方法,以达到同时控制桥梁横向和纵向的位移、提高桥梁在两个方向上的抗震性能的目的。本文选取某3跨连续梁高架桥的其中一联为研究对象。首先根据防屈曲支撑的稳定理论等要求,提出了防屈曲支撑在连续梁桥中的简化设计流程,并根据设计流程设计和例中防屈曲双向安置的构造要求设计出满足要求的防屈曲支撑;其次通过有限元软件Midas建立连续梁桥的有限元模型,对比分析原结构和防屈曲支撑结构的自振特性结果;最后通过设立五种工况,比较不同支撑布置方式和支撑长度下支撑轴力和桥梁的抗震性能。结果表明:防屈曲支撑具有很好的减震效果,能同时控制桥梁的纵向和横向位移,减小桥梁的地震效应;防屈曲支撑双向布置较纵横向布置更加经济合理,减震效果也更好;防屈曲支撑的长度对桥梁的抗震性能具有一定的影响,需对比分析选出最佳的支撑长度。
[Abstract]:The new code for seismic design of buildings improves the seismic fortification intensity in some areas and puts forward new requirements for the seismic performance of the buildings that have been built. As an important transportation hub, bridges play an important role in the process of emergency and disaster relief, so improving the seismic performance of bridges has become a hot issue. Buckling bracing is a new type of energy dissipation vibration absorption member, which has the advantages of superior to the main structure, high bearing capacity, stable mechanical performance and so on. It is widely used in high-rise building structure, but it is not widely used in bridge. Therefore, this paper first puts forward the method of the anti-buckling bracing in the continuous beam bridge, so as to control the lateral and longitudinal displacement of the bridge simultaneously and improve the seismic performance of the bridge in both directions. In this paper, one of the three-span continuous beam viaduct is selected as the research object. Firstly, according to the stability theory of buckling braces, the simplified design flow of buckling braces in continuous beam bridges is put forward. According to the design flow design and the structural requirements of anti-buckling bidirectional placement in an example, the anti-buckling support is designed. Secondly, the finite element model of continuous beam bridge is established by the finite element software Midas. The results of natural vibration characteristics of the original structure and the buckle-resistant bracing structure are compared. Finally, by setting up five working conditions, the support axial force and the seismic performance of the bridge under different bracing arrangements and lengths are compared. The results show that the anti-buckling bracing has a good damping effect, can simultaneously control the longitudinal and lateral displacement of the bridge, and reduce the seismic effect of the bridge, and the anti-buckling bracing is more economical and reasonable than the vertical and horizontal arrangement, and the effect of earthquake absorption is better. The length of buckling bracing has a certain influence on the seismic performance of the bridge.
【学位授予单位】：苏州科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U442.55

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