大跨度钢管桩桥梁地震反应分析
发布时间：2018-07-15 17:36
【摘要】：随着社会经济的发展,我国各类桥梁数量激增。然而,我国所处的地理位置决定了我国地震灾情频繁且严重,近年来多次破坏性地震给灾区造成了极大的人员伤亡和经济损失,因此对各类桥梁的抗震性能及加固方法进行深入研究,将对桥梁安全性的提高大有裨益。基于上述背景,本文主要做了以下工作:介绍了桥梁结构地震反应分析的相关理论和分析方法,以及桩周地基土等效弹簧刚度的求解理论、桩体的非线性、桩-土相互作用弹簧的非线性等。介绍了建立有限元模型及求解相关参数的方法,得到加载实测地震波后各钢管桩弯矩、曲率的地震反应值及分布规律。根据大桥的模态图及桩的弯矩、曲率校核情况,对支座类型和桩长、桩径及壁厚等进行调整,得到了较为合理的抗震设计方案。通过分析,可得以下结论:对于完全埋置于土中的桩来说,其在侧向地震力作用下的弯矩最大值出现在桩顶位置,在设计和施工时要保证桩顶与承台之间连接的可靠性;对于半埋于土中的桩来说,其弯矩最大值出现在桩的中部,靠近空气与土、水与土的交界面,在设计和施工时要注意交界面处桩的防腐蚀、防冲击等问题,避免对该处的承载力造成削弱。调整桩的尺寸条件时,要综合考虑抗震性能和竖向承载力等因素,避免影响其正常使用状态的承载能力。桩的强度、刚度都较高时,可保证其在地震作用下不被破坏,但易造成材料的浪费,且不能发挥钢材塑性变形耗能的性质,因此若有过多的桩在地震作用下未进入塑性状态,应考虑适当降低桩的强度和刚度。对于同一根桩,根据受力情况在不同深度使用不同的桩壁厚度是可行的,能够保证桩在地震作用下的弯矩和曲率都不超限,且能节省钢材的使用量。结论有利于增进工程人员对钢管桩地震响应特性的了解,也能对钢管桩桥梁的抗震设计及震后加固起到一定的指导作用。
[Abstract]:With the development of social economy, the number of all kinds of bridges in our country is increasing rapidly. However, the geographical location of our country determines the frequent and serious earthquake disaster situation in our country. In recent years, many destructive earthquakes have caused great casualties and economic losses to the disaster areas. Therefore, it will be helpful to improve the safety of bridges by studying the seismic performance and strengthening methods of all kinds of bridges. Based on the above background, the main work of this paper is as follows: the related theory and analysis method of seismic response analysis of bridge structure, the solution theory of equivalent spring stiffness of soil around pile, the nonlinearity of pile body are introduced. The nonlinearity of pile-soil interaction spring. The finite element model and the method of solving the related parameters are introduced. The seismic response value and distribution law of the bending moment and curvature of each steel pipe pile after loading the seismic wave are obtained. According to the modal diagram of the bridge and the moment and curvature of the pile, the support type, pile length, pile diameter and wall thickness are adjusted, and a more reasonable seismic design scheme is obtained. Through analysis, the following conclusions can be drawn: for the pile completely buried in soil, the maximum bending moment under lateral seismic force appears at the top of the pile, and the reliability of the connection between the pile top and the cap should be guaranteed in the design and construction; For the partially buried pile, the maximum bending moment appears in the middle of the pile, close to the interface between air and soil, water and soil. In the design and construction, attention should be paid to the anti-corrosion and anti-impact problems of the pile at the interface. Avoid weakening the bearing capacity. When adjusting the size condition of pile, the seismic performance and vertical bearing capacity should be considered comprehensively to avoid affecting the bearing capacity of the pile in its normal service state. When the strength and stiffness of pile are high, it can be guaranteed not to be destroyed under earthquake, but it is easy to cause waste of materials, and it can not exert the properties of energy dissipation of steel plastic deformation, so if there are too many piles not in plastic state under earthquake action, Consideration should be given to reducing the strength and stiffness of the pile. For the same pile, it is feasible to use different thickness of pile wall at different depth according to the stress condition, which can ensure that the bending moment and curvature of pile under seismic action are not over the limit, and can save the use of steel. Conclusion it is helpful to improve the understanding of the seismic response characteristics of steel pipe piles, and it can also play a guiding role in seismic design and post-earthquake reinforcement of steel pipe pile bridges.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55
[Abstract]:With the development of social economy, the number of all kinds of bridges in our country is increasing rapidly. However, the geographical location of our country determines the frequent and serious earthquake disaster situation in our country. In recent years, many destructive earthquakes have caused great casualties and economic losses to the disaster areas. Therefore, it will be helpful to improve the safety of bridges by studying the seismic performance and strengthening methods of all kinds of bridges. Based on the above background, the main work of this paper is as follows: the related theory and analysis method of seismic response analysis of bridge structure, the solution theory of equivalent spring stiffness of soil around pile, the nonlinearity of pile body are introduced. The nonlinearity of pile-soil interaction spring. The finite element model and the method of solving the related parameters are introduced. The seismic response value and distribution law of the bending moment and curvature of each steel pipe pile after loading the seismic wave are obtained. According to the modal diagram of the bridge and the moment and curvature of the pile, the support type, pile length, pile diameter and wall thickness are adjusted, and a more reasonable seismic design scheme is obtained. Through analysis, the following conclusions can be drawn: for the pile completely buried in soil, the maximum bending moment under lateral seismic force appears at the top of the pile, and the reliability of the connection between the pile top and the cap should be guaranteed in the design and construction; For the partially buried pile, the maximum bending moment appears in the middle of the pile, close to the interface between air and soil, water and soil. In the design and construction, attention should be paid to the anti-corrosion and anti-impact problems of the pile at the interface. Avoid weakening the bearing capacity. When adjusting the size condition of pile, the seismic performance and vertical bearing capacity should be considered comprehensively to avoid affecting the bearing capacity of the pile in its normal service state. When the strength and stiffness of pile are high, it can be guaranteed not to be destroyed under earthquake, but it is easy to cause waste of materials, and it can not exert the properties of energy dissipation of steel plastic deformation, so if there are too many piles not in plastic state under earthquake action, Consideration should be given to reducing the strength and stiffness of the pile. For the same pile, it is feasible to use different thickness of pile wall at different depth according to the stress condition, which can ensure that the bending moment and curvature of pile under seismic action are not over the limit, and can save the use of steel. Conclusion it is helpful to improve the understanding of the seismic response characteristics of steel pipe piles, and it can also play a guiding role in seismic design and post-earthquake reinforcement of steel pipe pile bridges.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55
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