中小跨径梁桥减隔震性能研究

发布时间：2018-10-24 06:18

【摘要】：在中国桥梁建设中,中小跨径桥梁是一种常用桥梁结构形式。目前,针对此类桥型的减隔震研究尚不完善。此类桥型的减隔震设计仍然没有明确的理论规范作为指导,若按传统的设计方法,必然会有一定的安全隐患。桥梁的减隔震设计在未来的桥梁设计中必然会有越来越重要的地位,本文主要针对此类桥型的减隔震性能进行分析,主要的研究内容如下:(1)阐述了减隔震桥梁的原理、特点,总结了国内外减隔震的发展现状以及未来发展的趋势。总结了减隔震设计方法及有限元建模的原理以及地震分析方法,对不同减隔震支座的模拟进行了说明。(2)通过对减隔震装置(LRB、阻尼器)进行参数敏感性分析,得出桥梁减隔震设计中减隔震装置参数的变化对隔震能力的影响。(3)通过对不同结构类型(圆柱墩和矩形墩)、不同减隔震方案(普通板式橡胶支座、阻尼器与普通板式橡胶支座组合使用、LRB、高阻尼橡胶支座、球型橡胶支座)组合的10种方案进行有限元模型计算,对比采用同一地震波作用下的动力特性、主梁位移、桥墩位移、塑性铰区域变化、墩底受力等不同。(4)通过对LRB、高阻尼橡胶支座、球型支座三种减隔震装置分别建立3种不同的墩高结构形式(等墩高、不等墩高对称、不等墩高不对称)。对比在同一减隔震装置下,同一桥梁同一地震力时,墩高的差异对隔震能力的影响。在同一地震力作用下,通过对特征周期、墩梁位移、主墩塑性转角、主墩墩底内力等动力反应结果进行对比研究。
[Abstract]:In the construction of bridges in China, middle and small span bridges are commonly used as bridge structures. At present, the research on the isolation of this kind of bridge is not perfect. There is still no clear theoretical criterion to guide the design of this kind of bridge. If the traditional design method is used, there will be some hidden trouble in safety. The seismic isolation design of bridge is bound to play an increasingly important role in the future bridge design. This paper mainly analyzes the seismic isolation performance of this type of bridge. The main research contents are as follows: (1) the principle and characteristics of seismic isolation bridge are expounded. The present situation and future development trend of seismic isolation at home and abroad are summarized. The design method of seismic isolation, the principle of finite element modeling and the method of seismic analysis are summarized. The simulation of different isolation bearings is explained. (2) the parameter sensitivity analysis of the isolation device (LRB, damper) is carried out. The influence of the parameters of the isolation device on the isolation ability is obtained. (3) through the different structural types (cylindrical pier and rectangular pier), different isolation schemes (ordinary plate rubber bearing), The finite element model of 10 kinds of schemes combined with dampers and ordinary plate rubber bearings, LRB, high damping rubber bearings and spherical rubber supports) were calculated. The dynamic characteristics of the same seismic wave, the displacement of the main beam, the displacement of the bridge pier, and the displacement of the bridge pier were compared with each other. The variation of plastic hinge region and the stress on the bottom of the pier are different. (4) three different types of pier height structure (equal pier height, unequal pier height symmetry, unequal pier height asymmetry) are established by using three kinds of isolation devices with LRB, high damping rubber bearing and spherical bearing. Under the same isolation device and the same seismic force of the same bridge, the effect of pier height difference on the isolation capacity is compared. Under the action of the same seismic force, the dynamic response results such as characteristic period, displacement of pier beam, plastic turning angle of main pier and internal force at the bottom of main pier are compared and studied.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55

【共引文献】