地震作用下中小跨度梁桥横向碰撞参数影响分析
发布时间：2019-07-07 20:08
【摘要】：地震作用下挡块与主梁的横向碰撞是影响桥梁结构地震响应的重要因素,目前缺乏针对城市高架桥中广泛使用的双柱式小箱梁结构横向碰撞问题的研究。以此类桥梁的典型工程为代表,建立了空间有限元模型,利用Kelvin模型对横向碰撞进行了准确模拟,重点探讨了接触单元刚度、挡块-主梁间隙、桥墩墩高、场地类别、上部结构与盖梁质量比等关键因素对双柱式小箱梁结构桥梁地震响应的影响。研究结果表明:碰撞刚度、碰撞间隙对双柱墩墩底内力有较大影响,应尽可能通过试验予以确定;场地特性、上部结构和盖梁质量比、桥墩高度等设计参数,均会对桥梁的地震受力产生较大影响,因而应在设计选型时进行适当的调整,并尽可能选择坚硬场地下高墩轻质主梁结构体系,研究成果可为同类高架桥的设计提供技术支持。
[Abstract]:The transverse collision between retaining block and main beam under earthquake is an important factor affecting the seismic response of bridge structure. At present, there is a lack of research on the transverse collision of double-column small box girder structure, which is widely used in urban viaduct. Taking the typical engineering of this kind of bridge as the representative, the spatial finite element model is established, and the transverse collision is accurately simulated by using Kelvin model. The effects of contact element stiffness, block-main beam clearance, pier height, site type, superstructure to cover beam mass ratio on the seismic response of double-column small box girder bridge are discussed in detail. The results show that the impact stiffness and collision gap have great influence on the internal force at the bottom of the pier with double columns, and should be determined by the test as far as possible. Site characteristics, mass ratio of superstructure to cover beam, pier height and other design parameters will have a great impact on the seismic force of the bridge, so appropriate adjustment should be made in the design selection, and the lightweight main beam structure system with high piers under the hard site should be selected as much as possible. The research results can provide technical support for the design of the same kind of viaduct.
【作者单位】： 北京建筑大学土木与交通工程学院;贵港新兴城投有限责任公司;
【基金】：建设部研究开发项目“多联超长城市高架桥地震反应特点与合理抗震体系研究”(2010-k3-47) 北京市优秀人才项目“北京市已建城市桥梁地震易损部位及合理加固措施研究”(070900601) 北京市教委科技计划面上项目(2013)“考虑土-桥台-结构相互作用的曲线桥地震破坏机理研究”(KM201310016007) 国家青年自然科学基金“基于精细化数值模拟的FPS隔震曲线桥抗震性能研究”(51308027)
【分类号】：U442.55
，
本文编号：2511412
[Abstract]:The transverse collision between retaining block and main beam under earthquake is an important factor affecting the seismic response of bridge structure. At present, there is a lack of research on the transverse collision of double-column small box girder structure, which is widely used in urban viaduct. Taking the typical engineering of this kind of bridge as the representative, the spatial finite element model is established, and the transverse collision is accurately simulated by using Kelvin model. The effects of contact element stiffness, block-main beam clearance, pier height, site type, superstructure to cover beam mass ratio on the seismic response of double-column small box girder bridge are discussed in detail. The results show that the impact stiffness and collision gap have great influence on the internal force at the bottom of the pier with double columns, and should be determined by the test as far as possible. Site characteristics, mass ratio of superstructure to cover beam, pier height and other design parameters will have a great impact on the seismic force of the bridge, so appropriate adjustment should be made in the design selection, and the lightweight main beam structure system with high piers under the hard site should be selected as much as possible. The research results can provide technical support for the design of the same kind of viaduct.
【作者单位】： 北京建筑大学土木与交通工程学院;贵港新兴城投有限责任公司;
【基金】：建设部研究开发项目“多联超长城市高架桥地震反应特点与合理抗震体系研究”(2010-k3-47) 北京市优秀人才项目“北京市已建城市桥梁地震易损部位及合理加固措施研究”(070900601) 北京市教委科技计划面上项目(2013)“考虑土-桥台-结构相互作用的曲线桥地震破坏机理研究”(KM201310016007) 国家青年自然科学基金“基于精细化数值模拟的FPS隔震曲线桥抗震性能研究”(51308027)
【分类号】：U442.55
，
本文编号：2511412
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