考虑支座摩擦作用的桥梁减震榫位移控制研究

发布时间：2018-03-02 15:52

本文选题：活动支座摩擦力　切入点：运动相互作用　出处：《烟台大学》2017年硕士论文　论文类型：学位论文

【摘要】：地震的发生对桥梁结构的安全性具有极大的威胁,若桥梁在地震中受损而丧失使用功能,除了会造成人员伤亡与财产损失外,也会影响救灾抢险工作。因此研究桥梁结构的震害,研究支座摩擦作用的不利影响,研究造价低、易于更换的减隔震装置对减少地震损失、确保震后交通畅通具有重大的理论与实际意义。本文对支座对桥梁结构的地震反应进行研究,重点分析桥墩间运动相互作用对连续梁桥弹塑性地震反应的不利影响,并提出防止落梁、控制梁体位移且又不显著增大桥梁结构的地震反应的新型减隔震装置。地震中,活动支座的摩擦力可以通过主梁传递给固定支座墩,引起桥墩间运动相互作用,为研究这种相互作用对连续梁桥弹塑性地震反应的影响,本文考虑地震时主梁和活动支座墩间的摩擦作用及桥墩可能进入的塑性状态,建立不同墩高的连续梁桥有限元分析模型,利用非线性动态时程分析法进行分析,对不同方案下的固定墩墩底最大曲率进行底部分析,找出活动支座摩擦作用使固定支座墩抗震性能产生不利的情况,并进一步分析各墩墩顶速度时程曲线,发现如果通过主梁传递的摩擦力的方向与固定支座墩本身的振动方向相同,则活动支座摩擦作用对固定支座墩的地震反应起到不利的增大作用。研究桥墩间运动相互作用对连续梁桥弹塑性地震反应的影响,对确保桥梁整体结构具有足够的抗震性能具有非常重要的意义。设置减隔震装置是目前提高桥梁结构抗震性能的一种有效措施。但是结构的抗震设计思维多以单道防线为主,无法满足桥梁结构对抗震构造措施耗能与强度的双重要求。因此本文在现有构造措施的基础上,以“多道防线、功能分离、逐级生效”为原则,采用耗能构件与强度构件分离的设计方法,提出减震榫位移控制榫新型结构体系。本文从理论上分析了减震榫位移控制榫的工作过程,并分析了每个阶段的单元恢复力图形。在有限元模拟上,本文以某一连续梁桥为工程背景,对比分析了五种情况下的有限元模型,发现减震榫位移控制榫比单道防线更有利于从耗能和强度上提高桥梁结构的抗震性能。结合减震榫位移控制榫装置的设计原理,对影响减震效果的主要参数的大小进行调节,研究参数的变化对桥梁结构抗震性能的影响。减震榫位移控制榫新型结构体系的提出对提高桥梁结构的抗震能力和抗震水平有一定的参考价值。
[Abstract]:The occurrence of earthquake is a great threat to the safety of bridge structure. If the bridge is damaged in the earthquake and loses its function, it will cause casualties and property losses. Therefore, the earthquake damage of bridge structure, the adverse effect of bearing friction, the low cost and easy-to-replace isolation device can reduce the earthquake loss. It is of great theoretical and practical significance to ensure the smooth traffic after the earthquake. In this paper, the seismic response of the support to the bridge structure is studied, and the adverse effect of the dynamic interaction between the piers on the elastoplastic seismic response of the continuous beam bridge is analyzed. A new type of isolation device for preventing beam falling, controlling beam body displacement and not significantly increasing the seismic response of bridge structure is proposed. In earthquake, the friction of movable support can be transferred to the fixed support pier through the main beam. In order to study the effect of the interaction on the elastoplastic seismic response of continuous beam bridge, the friction between the main beam and the movable support pier and the plastic state that the pier may enter during the earthquake are considered in this paper. The finite element analysis model of continuous beam bridge with different piers height is established. The nonlinear dynamic time history analysis method is used to analyze the bottom of fixed pier bottom with maximum curvature under different schemes. Find out the unfavorable seismic behavior of the fixed support pier caused by the friction action of the movable support, and further analyze the velocity time history curve of the pier top. It is found that if the direction of friction transmitted through the main beam is the same as the vibration direction of the fixed bearing pier itself, Therefore, the frictional action of the movable support has an adverse effect on the seismic response of the fixed support pier, and the effect of the dynamic interaction between the piers on the elastoplastic seismic response of the continuous beam bridge is studied. It is very important to ensure that the whole bridge structure has enough seismic performance. It is an effective measure to improve the seismic performance of bridge structure by setting up the isolation device. However, the seismic design thinking of the structure is dominated by the single line of defense. It can not meet the dual requirements of energy consumption and strength of seismic structural measures for bridge structure. Therefore, based on the existing structural measures, the principle of "multi-defense lines, separation of functions, step by step effectiveness" is taken as the principle. Using the design method of separating the energy dissipation member from the strength member, a new structure system of the displacement control tenon of the damping tenon is proposed. The working process of the displacement control tenon of the damping tenon is analyzed theoretically in this paper. In the finite element simulation, a continuous beam bridge is taken as the engineering background, and the finite element models under five conditions are compared and analyzed. It is found that the damped displacement control tenon is better than the single line of defense in improving the seismic performance of the bridge structure in terms of energy dissipation and strength. Combined with the design principle of the mortise control device, the magnitude of the main parameters affecting the damping effect is adjusted. The influence of the change of parameters on the seismic performance of bridge structure is studied. The proposed new structural system with mortise displacement control tenon has certain reference value for improving the aseismic capacity and seismic level of bridge structure.
【学位授予单位】：烟台大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U442.55

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