装配式钢管混凝土桥墩柱在高速公路改扩建跨线桥中的抗震分析及应用

发布时间：2018-05-05 13:45

本文选题：钢管混凝土 + 桥墩　；参考：《河北工业大学》2015年硕士论文

【摘要】：为了解决高速公路改扩建中互通匝道桥施工给主线正常行车造成的干扰,以最短的时间完成拆除、建设、通行流程,一般时间控制在两周左右,基于此问题,提出墩台预制和快速拼装技术。依托工程为京石改扩建保定互通A匝道装配式桥梁下部结构-钢管混凝土圆形墩柱。圆形钢管混凝土柱的强度,在任意方向都是相同的,这对于抵抗方向不确定的地震作用,是很有效的,同时在其中加配一定数量的纵向钢筋和螺旋箍筋,纵筋可以直接提高整体抗压强度,箍筋可增加对核心混凝土的约束作用,以此来减少混凝土徐变和收缩,同时配筋也可以提高钢管混凝土桥墩的承载力及其延性,改善弹性阶段受力。这种技术的优势在于:节约模板用量、缩短断交时间、提高经济效益,可以采用标准化工厂生产现场拼装方法。采用有限元软件ANSYS对下部结构在成桥运营阶段的安全性进行验证,在承载力和正常使用极限状态下都进行了受力分析,结果均满足规范要求。接着主要针对抗震性能进行分析,详细研究如下:由于全桥上部主梁和下部桥墩结构都采用装配式,这在国内桥梁发展史上是一种突破和创新。通过对实桥进行必要的简化,采用有限元软件Midas civil进行弹性反应谱分析和非线性动态时程分析,对其抗震性能进行理论计算,结合时程分析计算得到的桥墩塑性铰区弯矩-转角滞回曲线,对桥墩的延性和耗能性进行了分析,得出抗震性能很好的结论。通过XTRACT截面分析软件对钢筋混凝土,钢管素混凝土和钢管配筋混凝土桥墩的承载力和延性做了比较,得出钢管配筋混凝土柱的截面承载力和延性都高于前两者。如果以后要把此种桥墩用于装配式高墩桥梁结构,就需要对其分段节点位置如何选择做分析,本文简单地针对其在地震作用下横桥向和纵桥向的受力特点,分别从内力和压应力方面对其节点位置选择进行了计算,最后得出如何分段更有利于抗震的结果。
[Abstract]:In order to solve the interference caused by the construction of intercommunication ramp bridge in expressway reconstruction and extension to the main line normal running, the demolition, construction and passage flow should be completed in the shortest time. The general time is controlled in about two weeks. Based on this problem, The technology of precast and quick assembling of pier and abutment is put forward. Relying on the project for the reconstruction and expansion of Baoding Interchange A ramp fabricated bridge understructure-concrete filled steel tubular circular pier column. The strength of circular concrete-filled steel tubular columns is the same in any direction, which is very effective for resisting seismic action with uncertain direction, and a certain number of longitudinal reinforcement and spiral stirrups are added to it. Longitudinal reinforcement can directly improve the overall compressive strength, stirrups can increase the constraint on the core concrete to reduce the creep and shrinkage of concrete, and the reinforcement can also improve the bearing capacity and ductility of concrete filled steel tubular piers. Improve the elastic stage of the force. The advantages of this technology lie in saving the use of formwork, shortening the time of breaking off, and improving economic benefit. The method of site assembling in standardized factory can be adopted. The finite element software ANSYS is used to verify the safety of the substructure in the operation stage of the bridge. The bearing capacity and the normal service limit state are analyzed and the results meet the requirements of the code. Then the seismic performance is analyzed in detail as follows: because the upper main girder and the lower pier structure of the whole bridge are fabricated this is a breakthrough and innovation in the history of bridge development in China. Through the necessary simplification of the real bridge, the elastic response spectrum analysis and nonlinear dynamic time-history analysis are carried out by using the finite element software Midas civil, and the seismic performance of the bridge is calculated theoretically. The ductility and energy dissipation of piers are analyzed based on the moment-rotation hysteretic curve in the plastic hinge region of bridge piers obtained by time history analysis and the conclusion that the seismic performance is very good is obtained. The bearing capacity and ductility of reinforced concrete, plain concrete filled steel tube and reinforced concrete filled steel tube pier are compared by XTRACT software. The results show that the bearing capacity and ductility of reinforced concrete filled steel tubular columns are higher than those of the former. If this kind of pier is to be used in the structure of prefabricated high pier bridge in the future, it is necessary to analyze how to select the position of the segmented node. This paper simply aims at the stress characteristics of the transverse and longitudinal bridge under the earthquake action. The location selection of the joints is calculated from the aspects of internal force and compressive stress, and the results of how to segment the joints are obtained.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55

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