预应力混凝土桥墩受力性能分析
发布时间：2018-12-09 10:44
【摘要】：随着经济社会的发展和科学技术的进步,公路桥梁的建设无论是设计理念还是施工工艺都取得了辉煌成就,各种跨度巨大、造型优美的桥梁拔地而起。尽管如此,在桥梁施工过程中,由于对桥梁的理解不够深刻等原因,施工事故时有发生,给人民的生命财产安全带来很大损失。近年来世界各地都发生了不同规模的地震,桥梁工程在震害中破坏惨重,特别是桥墩破坏所导致的后果更加严重。所以建造桥梁时有必要对桥梁施工阶段的受力以及桥墩的抗震性能进行计算分析,确保桥梁的建设能够安全顺利地进行以及在地震来临时不会发生破坏。正确选用钢筋混凝土本构关系模型对于提高工程结构数值分析精度十分关键。对桥墩所用钢筋混凝土进行试验研究,确定与实际相符的非线性本构关系模型用于桥墩施工阶段和抗震性能有限元分析。采用与桥墩相同混凝土制作试件进行加载试验。应用有限元分析软件建立钢筋混凝土试件的三维有限元分析模型,并分别基于不同非线性本构关系模型对试验过程进行数值模拟。将试验结果与数值分析结果进行对比,确定与试验结果吻合程度最好的本构关系模型并基于该本构关系模型对桥墩进行施工阶段及Pushover抗震性能分析。进行桥墩施工阶段受力分析时,建立结构的三维有限元模型,然后针对三个不利施工工况进行数值分析并针对可能出现的问题提出可以采取的措施。进行抗震性能分析时,在顺桥方向和横桥方向水平震度逐级增大直至结构发生破坏,根据不同水平震度时结构的受力状态对桥墩的抗震性能进行评价。研究表明基于拟选用本构关系模型进行数值分析所得结果与试验结果吻合程度较好。桥墩在施工阶段的不利工况作用下会出现开裂并向结构内部延伸,施工过程中应该根据工程实际采取适当的措施。Pushover分析结果表明,桥墩横桥方向抗震性能良好,顺桥方向抗震性能不能满足规范要求,应该对结构的配筋进行调整以优化其抗震性能。通过以上研究可以确保桥墩施工的安全顺利进行并能够保证地震发生时不会导致严重的破坏,为我国今后类似工程的建设提供借鉴。
[Abstract]:With the development of economy and society and the progress of science and technology, the construction of highway bridges has made brilliant achievements in both design concept and construction technology. However, in the process of bridge construction, due to the lack of deep understanding of the bridge and other reasons, construction accidents occur from time to time, which brings great loss to the safety of people's lives and property. In recent years, different scale earthquakes have occurred all over the world, and the damage of bridge engineering is very serious, especially the damage of pier. Therefore, it is necessary to calculate and analyze the stress on the bridge during the construction stage and the seismic behavior of the pier, so as to ensure that the bridge construction can be carried out safely and smoothly and that there will be no damage when the earthquake comes. The correct selection of reinforced concrete constitutive relation model is very important to improve the accuracy of numerical analysis of engineering structures. The experimental study on reinforced concrete used in pier is carried out, and the nonlinear constitutive relation model is determined to be used in the finite element analysis of pier construction stage and seismic performance. The same concrete as the bridge pier is used to make the specimen for loading test. The 3D finite element analysis model of reinforced concrete specimens was established by using finite element analysis software, and the experimental process was numerically simulated based on different nonlinear constitutive relation models. By comparing the test results with the numerical analysis results, the constitutive relation model with the best agreement with the test results is determined. Based on the constitutive relation model, the seismic behavior of the pier during the construction phase and the Pushover is analyzed. The three-dimensional finite element model of the structure is established when the pier is subjected to force analysis in the construction stage. Then the numerical analysis is carried out in view of the three unfavorable construction conditions and the measures that can be taken to solve the possible problems are put forward. In seismic performance analysis, the seismic behavior of pier is evaluated according to the stress state of the structure in the direction of the bridge and the direction of the transverse bridge, which increases gradually until the damage of the structure occurs in the direction of the bridge and the direction of the horizontal bridge. The results of numerical analysis based on the proposed constitutive relation model are in good agreement with the experimental results. The pier will crack and extend inside the structure under the unfavorable working conditions in the construction stage. The appropriate measures should be taken according to the engineering practice during the construction. The results of Pushover analysis show that the aseismic performance of the bridge piers in the transverse direction is good. The seismic performance along the bridge direction can not meet the requirements of the code, so the reinforcement of the structure should be adjusted to optimize its seismic performance. The above research can ensure the safe and smooth construction of bridge piers and ensure that the earthquake will not lead to serious damage, and provide a reference for the construction of similar projects in China in the future.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441
本文编号：2369252
[Abstract]:With the development of economy and society and the progress of science and technology, the construction of highway bridges has made brilliant achievements in both design concept and construction technology. However, in the process of bridge construction, due to the lack of deep understanding of the bridge and other reasons, construction accidents occur from time to time, which brings great loss to the safety of people's lives and property. In recent years, different scale earthquakes have occurred all over the world, and the damage of bridge engineering is very serious, especially the damage of pier. Therefore, it is necessary to calculate and analyze the stress on the bridge during the construction stage and the seismic behavior of the pier, so as to ensure that the bridge construction can be carried out safely and smoothly and that there will be no damage when the earthquake comes. The correct selection of reinforced concrete constitutive relation model is very important to improve the accuracy of numerical analysis of engineering structures. The experimental study on reinforced concrete used in pier is carried out, and the nonlinear constitutive relation model is determined to be used in the finite element analysis of pier construction stage and seismic performance. The same concrete as the bridge pier is used to make the specimen for loading test. The 3D finite element analysis model of reinforced concrete specimens was established by using finite element analysis software, and the experimental process was numerically simulated based on different nonlinear constitutive relation models. By comparing the test results with the numerical analysis results, the constitutive relation model with the best agreement with the test results is determined. Based on the constitutive relation model, the seismic behavior of the pier during the construction phase and the Pushover is analyzed. The three-dimensional finite element model of the structure is established when the pier is subjected to force analysis in the construction stage. Then the numerical analysis is carried out in view of the three unfavorable construction conditions and the measures that can be taken to solve the possible problems are put forward. In seismic performance analysis, the seismic behavior of pier is evaluated according to the stress state of the structure in the direction of the bridge and the direction of the transverse bridge, which increases gradually until the damage of the structure occurs in the direction of the bridge and the direction of the horizontal bridge. The results of numerical analysis based on the proposed constitutive relation model are in good agreement with the experimental results. The pier will crack and extend inside the structure under the unfavorable working conditions in the construction stage. The appropriate measures should be taken according to the engineering practice during the construction. The results of Pushover analysis show that the aseismic performance of the bridge piers in the transverse direction is good. The seismic performance along the bridge direction can not meet the requirements of the code, so the reinforcement of the structure should be adjusted to optimize its seismic performance. The above research can ensure the safe and smooth construction of bridge piers and ensure that the earthquake will not lead to serious damage, and provide a reference for the construction of similar projects in China in the future.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441
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