双曲面球型减隔震支座对桥梁抗震性能影响的研究

发布时间：2018-03-05 06:02

本文选题：双曲面球型减隔震支座　切入点：抗震性能　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：目前我国既有桥梁中广泛采用的支座以板式橡胶支座、盆式橡胶支座、聚四氟乙烯滑板支座为主，而这些支座在地震发生时都不具备抗震的作用。地震中，，桥梁工程的倒塌会危及桥上、桥下人们的生命财产安全，地震后，由于桥梁工程被破坏，需要重建桥梁或者选择另外的交通路线，使救援人员无法及时地对灾区人民进行紧急救援和抗震救灾，导致灾区的伤亡人数大大增加。因此，开展双曲面球型减隔震支座对桥梁抗震性能影响的研究十分必要。本文总结了国内外桥梁抗震设计的研究成果，对桥梁抗震设计的准则、分析方法、双曲面球型减隔震支座的构造特点和抗震原理进行了归纳总结。本文以“国道110线乌海黄河特大桥新建工程”中立交桥NWU3联为背景工程，参考国内外抗震分析的相关文献，利用Midas Civil软件建立了一联3x20m连续梁桥的抗震模型，分别采用反应谱法和动力时程法分析了设置普通橡胶支座和双曲面球型减隔震支座时梁端位移、桥墩立柱底弯矩和桩基顶弯矩的变化。研究发现，设置双曲面球型减隔震支座可显著降低桥梁的地震响应。本文针对立交桥NWU3联，分别对正常使用荷载和地震荷载作用下双曲面球型减隔震支座进行了验算。研究发现，双曲面球型减隔震支座在正常使用荷载作用下仅起到普通支座的作用，在地震荷载作用下能通过销栓的破坏，承受较大位移，起到耗能的作用。本文利用Midas Civil软件软件绘制了双曲面球型减隔震支座的滞回曲线，该曲线较为饱满，说明双曲面球型减隔震支座的耗能效果较为显著，有很好的减隔震作用。
[Abstract]:At present, the widely used supports of existing bridges in our country are plate rubber bearings, basin rubber supports and PTFE skateboards, but none of these supports have the function of aseismic at the time of the earthquake. The collapse of the bridge works will endanger the safety of people's lives and property on and under the bridge. After the earthquake, because of the destruction of the bridge project, it is necessary to rebuild the bridge or choose another traffic route. The rescue workers are unable to carry out emergency rescue and earthquake relief to the people in the disaster area in time, resulting in a great increase in the number of casualties in the disaster area. Therefore, it is necessary to study the impact of the hyperboloid spherical isolation bearing on the seismic performance of the bridge. In this paper, the research results of seismic design of bridges at home and abroad are summarized. The criteria, analytical methods, structural characteristics and seismic principles of hyperboloid spherical isolation bearings are summarized. In this paper, taking the NWU3 connection of the overpass bridge of Wuhai Yellow River Bridge along National Highway 110 as the background project, and referring to the relevant documents of seismic analysis at home and abroad, the seismic model of a 3x20m continuous beam bridge is established by using the software of Midas Civil. The changes of the beam end displacement, the bottom moment of the pier and the top moment of the pile foundation are analyzed by using the response spectrum method and the dynamic time-process method, respectively, when the ordinary rubber bearing and the hyperboloid spherical shock isolation support are installed. The seismic response of the bridge can be significantly reduced by setting the hyperbolic spherical shock isolation support. In this paper, the hyperboloid spherical isolation bearing under normal service load and seismic load is checked and calculated for the NWU3 connection of the overpass. The hyperboloid spherical bearing can only play the role of ordinary bearing under normal service load. Under the action of earthquake load, it can withstand large displacement and dissipate energy through the damage of pin bolt. In this paper, the hysteretic curve of hyperboloid spherical isolation bearing is drawn by Midas Civil software. The curve is full, which shows that the energy dissipation effect of hyperboloid spherical isolation support is obvious and has good isolation effect.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55;U443.36

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