防屈曲耗能支撑在桥梁上的减震性能研究

发布时间：2018-05-10 06:55

本文选题：防屈曲耗能支撑 + 抗震设计　；参考：《长安大学》2015年硕士论文

【摘要】：桥梁作为交通枢纽的重要组成部分,对经济发展和人们出行都有着重要的作用,但一旦发生地震,将会导致桥梁的破坏,这不仅威胁人们的生命财产安全,更会影响以后的救灾工作,而防屈曲耗能支撑装置作为一种耗能减震装置,因其显著的优点在建筑领域已经得到了广泛的应用。然而在桥梁上的应用较少,本文提出将防屈曲耗能支撑装置安装在桥梁上,进而得出设置防屈曲耗能支撑装置的桥梁抗震设计方法。本文以3跨等截面连续梁桥和3跨变截面连续梁桥为例,首先利用有限元软件Midas分析防屈曲耗能支撑装置在等截面连续梁桥上的减震效果,并比较了不同的支撑角度、不同的支撑截面面积、不同的支撑长度、不同地震激励对减震效果的影响,并通过对以上各因素的分析找出最佳减震方案;其次分析双柱间设置人字形支撑形式的防屈曲耗能支撑的地震响应情况。然后利用有限元软件Midas分析防屈曲耗能支撑在变截面连续梁桥上的减震效果,包括加入防屈曲耗能支撑的减震效果以及不同支撑角度和支撑数量对减震效果的影响,同时对比不同支撑类型的减震效果。结果表明:防屈曲耗能支撑滞回曲线饱满,能够很好的耗散地震能量,明显的降低了固定墩以及梁体在地震作用下的受力和位移情况,同时也得出不同的支撑方案对减震效果有着明显的影响。由于不同的地震激励作用导致桥梁的响应情况不同,所以设计人员应根据桥址实际的地震记录和地震危险性评定选择合理的支撑方案,从而得到理想的减震效果。
[Abstract]:As an important part of transportation hub, bridge plays an important role in economic development and people's travel, but once earthquake occurs, it will lead to the destruction of bridge, which not only threatens the safety of people's lives and property. As a kind of energy dissipation device, the anti-buckling energy dissipation support device has been widely used in the field of architecture because of its remarkable advantages. However, there are few applications on the bridge. In this paper, the anti-buckling energy dissipation support device is installed on the bridge, and then the anti-buckling energy dissipation support device is proposed to design the bridge aseismic. Taking three span continuous beam bridge with equal section and three span continuous beam bridge with variable cross section as examples, this paper first uses finite element software Midas to analyze the effect of anti-buckling energy dissipation bracing device on the same section continuous beam bridge, and compares the different supporting angles. The effect of different bracing cross-section area, different bracing length and different earthquake excitation on the shock absorption effect is analyzed, and the best shock absorption scheme is found through the analysis of the above factors. Secondly, the seismic response of the buckling and energy dissipation braces with herringbone bracing between two columns is analyzed. Then using the finite element software Midas to analyze the effect of anti-buckling energy dissipation bracing on the continuous beam bridge with variable section, including the effect of adding anti-buckling energy dissipation bracing, and the influence of different supporting angles and the number of braces on the damping effect. At the same time, the effects of different bracing types are compared. The results show that the hysteretic curve of anti-buckling energy dissipation support is full, and the seismic energy can be dissipated well, and the stress and displacement of fixed pier and beam under earthquake action are obviously reduced. At the same time, it is also found that different support schemes have a significant impact on the shock absorption effect. Due to the different earthquake excitation, the bridge response is different, so the designer should select the reasonable support scheme according to the actual seismic records and seismic risk assessment of the bridge site, and get the ideal seismic absorption effect.
【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】：U441.3

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