高承载力隔震支座的力学性能初步研究

发布时间：2019-02-18 18:02

【摘要】：桥梁减隔震技术中最常用的是铅芯隔震橡胶支座(LRB支座)和高阻尼隔震橡胶支座(HDR支座),针对这2种支座设计压应力不足的问题,基于新型阻尼材料,研制了高承载力隔震支座(GRB支座),其设计压应力可以达到35 MPa,极限压应力可以达到210MPa。对GRB支座的疲劳特性、剪应变相关性、压应力相关性、频率相关性、温度相关性和反复加载次数相关性进行试验,证明其具有良好的力学性能。以某桥6×110m的连续梁桥段为背景,采用有限元软件MIDAS Civil 2015建立桥梁计算模型,通过特征值分析和时程分析,对比桥梁在LRB支座隔震体系和GRB支座隔震体系下的主梁位移、关键截面的弯矩内力等结构响应。研究表明,GRB支座具有较大的竖向设计压应力,应用在大跨径现浇连续梁桥上,隔震效果好,支座的尺寸小,可缩小盖梁和伸缩缝尺寸,降低桥梁造价。
[Abstract]:In the bridge isolation technology, lead core isolation rubber bearing (LRB support) and high damping isolation rubber support (HDR support) are the most commonly used ones. In order to solve the problem of insufficient pressure stress in the design of these two kinds of bearings, a new damping material is used. The high bearing capacity isolation support (GRB support) is developed. The design compressive stress can reach 35 MPa, limit compressive stress can reach 210 MPA. The fatigue characteristics, shear strain correlation, compressive stress correlation, frequency correlation, temperature correlation and repeated loading times of the GRB bearing were tested, and the good mechanical properties were proved. Taking the 6 脳 110m continuous beam section of a certain bridge as the background, the bridge calculation model is established by using the finite element software MIDAS Civil 2015. Through eigenvalue analysis and time history analysis, the main beam displacement of the bridge under the LRB bearing isolation system and the GRB bearing isolation system is compared. The structural responses such as internal bending forces of critical sections. The results show that the GRB bearing has a large vertical design compressive stress, which is applied to the long span cast-in-place continuous beam bridge. The isolation effect is good, the size of the bearing is small, the size of the cover beam and expansion joint can be reduced, and the cost of the bridge can be reduced.
【作者单位】：陕西省交通规划设计研究院;
【分类号】：U442.55;U443.36

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