人字形分枝曲线桥梁多维地震模拟振动台试验与仿真分析
发布时间：2018-07-31 13:09
【摘要】：随着我国成为世界第二大经济体,城市交通流量与日俱增。为了解决或缓和交通拥堵问题,近年来许多城市修建了大量的多支分叉曲线桥梁,其建筑形式优美,行车顺畅,与环境协调。但是,这类桥梁结构组成复杂,连接部位较多,受力远比直线梁桥复杂,在强烈地震下,会产生多维碰撞或倒塌破坏,其地震反应和抗震性能是当前研究的重要课题,意义重大。本文通过制作实体模型进行多维地震模拟振动台试验、建立有限元模型进行仿真分析等方法,对人字形分枝曲线桥梁进行地震反应分析和抗震性能研究。(1)探讨了国内外曲线桥梁的震害特点和发展现状,结合振动台试验对曲线桥梁在多维地震过程中的震害现象进行分析研究,对该类桥梁的震害规律进行总结。(2)探讨了多维地震作用下的抗震理论在曲线桥梁设计和分析中的应用问题。探讨了一致激励下曲线桥梁多维地震理论,对多维地震分析方法进行总结,主要方法有:多维反应谱法和多维时程分析法。(3)设计并制作了缩尺比例为1/20的人字形分枝曲线桥梁实体模型,进行单点多向地震模拟振动台试验,分析了模型结构墩顶顺桥向加速度和梁体跨中加速度、墩梁相对位移和邻梁相对位移、桥墩墩底应变等动力响应;分析了梁体和桥墩裂缝分布规律和开展原因;直线桥和曲线桥在不同烈度地震作用下动力响应区别;通过试验数据分析了单向、双向和三向地震作用对模型桥梁地震反应的影响。(4)通过大型有限元软件建立人字形分枝曲线桥梁动力计算模型,输入加速度峰值500gal的El-Centro波,分析了顺桥向墩顶加速度、邻梁相对位移、墩顶轴力和剪力、梁体跨中弯矩和扭矩等动力响应,发现三向和双向地震波输入下的加速度、相对位移和内力响应较单向地震下响应大,充分说明了多维地震的危害性更大。为使结构地震反应计算结果符合客观实际,确保结构的安全性和可靠性,建议设计分枝曲线桥梁时,必须进行多维多向地震反应分析。
[Abstract]:With China becoming the second largest economy in the world, urban traffic volume is increasing day by day. In order to solve or alleviate the problem of traffic congestion, in recent years, a large number of bifurcation curve bridges have been built in many cities. However, this kind of bridge structure has complex composition, many connecting sites, and the force is much more complicated than that of the linear beam bridge. Under the strong earthquake, the multi-dimensional impact or collapse will occur. The seismic response and seismic performance of this kind of bridge is an important subject in the current research. It is of great significance. In this paper, by making solid model to carry out shaking table test of multi-dimensional seismic simulation, the finite element model is established for simulation and analysis. Seismic response analysis and seismic performance study of herringbone branched curved bridges are carried out. (1) the characteristics and development of seismic damage of curved bridges at home and abroad are discussed. Combined with shaking table test, the seismic damage phenomenon of curved bridge during multidimensional earthquake is analyzed and studied. The seismic damage law of this kind of bridges is summarized. (2) the application of seismic theory under multidimensional earthquake in the design and analysis of curved bridges is discussed. The multidimensional seismic theory of curved bridge under uniform excitation is discussed, and the method of multidimensional seismic analysis is summarized. The main methods are as follows: multidimensional response spectrum method and multidimensional time-history analysis method. (3) A bridge solid model with a scale of 1 / 20 is designed and fabricated, and the shaking table test of single point multi-directional seismic simulation is carried out. The dynamic responses of the model structure such as the vertical acceleration of the pier top and the mid-span acceleration of the beam, the relative displacement of the pier beam and the relative displacement of the adjacent beam, and the strain at the bottom of the pier are analyzed, and the distribution law of the cracks in the beam body and the pier and the reasons for the crack development are analyzed. The dynamic response of linear bridge and curved bridge under different intensity earthquake is different. The influence of bidirectional and three-direction seismic action on the seismic response of the model bridge. (4) the dynamic calculation model of the herringbone branching curve bridge is established by the large-scale finite element software, the El-Centro wave of the acceleration peak value 500gal is input, and the acceleration of the pier top of the forward bridge is analyzed. The relative displacement of adjacent beams, the axial force and shear force at the top of the pier, the moment and torque in the middle of the beam span, and so on. It is found that the response of the relative displacement and internal force to the acceleration under the three-direction and bi-directional seismic waves is greater than that under the unidirectional earthquake. It fully shows that multidimensional earthquakes are more harmful. In order to ensure the safety and reliability of the structure, it is suggested that the multi-dimensional and multi-directional seismic response analysis should be carried out when designing the branching curve bridge in order to accord with the objective reality and ensure the safety and reliability of the structure.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55
本文编号：2155675
[Abstract]:With China becoming the second largest economy in the world, urban traffic volume is increasing day by day. In order to solve or alleviate the problem of traffic congestion, in recent years, a large number of bifurcation curve bridges have been built in many cities. However, this kind of bridge structure has complex composition, many connecting sites, and the force is much more complicated than that of the linear beam bridge. Under the strong earthquake, the multi-dimensional impact or collapse will occur. The seismic response and seismic performance of this kind of bridge is an important subject in the current research. It is of great significance. In this paper, by making solid model to carry out shaking table test of multi-dimensional seismic simulation, the finite element model is established for simulation and analysis. Seismic response analysis and seismic performance study of herringbone branched curved bridges are carried out. (1) the characteristics and development of seismic damage of curved bridges at home and abroad are discussed. Combined with shaking table test, the seismic damage phenomenon of curved bridge during multidimensional earthquake is analyzed and studied. The seismic damage law of this kind of bridges is summarized. (2) the application of seismic theory under multidimensional earthquake in the design and analysis of curved bridges is discussed. The multidimensional seismic theory of curved bridge under uniform excitation is discussed, and the method of multidimensional seismic analysis is summarized. The main methods are as follows: multidimensional response spectrum method and multidimensional time-history analysis method. (3) A bridge solid model with a scale of 1 / 20 is designed and fabricated, and the shaking table test of single point multi-directional seismic simulation is carried out. The dynamic responses of the model structure such as the vertical acceleration of the pier top and the mid-span acceleration of the beam, the relative displacement of the pier beam and the relative displacement of the adjacent beam, and the strain at the bottom of the pier are analyzed, and the distribution law of the cracks in the beam body and the pier and the reasons for the crack development are analyzed. The dynamic response of linear bridge and curved bridge under different intensity earthquake is different. The influence of bidirectional and three-direction seismic action on the seismic response of the model bridge. (4) the dynamic calculation model of the herringbone branching curve bridge is established by the large-scale finite element software, the El-Centro wave of the acceleration peak value 500gal is input, and the acceleration of the pier top of the forward bridge is analyzed. The relative displacement of adjacent beams, the axial force and shear force at the top of the pier, the moment and torque in the middle of the beam span, and so on. It is found that the response of the relative displacement and internal force to the acceleration under the three-direction and bi-directional seismic waves is greater than that under the unidirectional earthquake. It fully shows that multidimensional earthquakes are more harmful. In order to ensure the safety and reliability of the structure, it is suggested that the multi-dimensional and multi-directional seismic response analysis should be carried out when designing the branching curve bridge in order to accord with the objective reality and ensure the safety and reliability of the structure.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55
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