基于OpenSEES纤维模型的PRC简支梁桥材料非线性分析研究
发布时间：2018-10-18 10:58
【摘要】：由于组成预应力钢筋混凝土的材料自身存在非线性，用弹性力学手段来分析和研究预应力钢筋混凝土结构满足不了实际工程对精度的要求。采用非线性方法进行分析已经成为主流趋势，本文将采用OpenSEES纤维模型分析钢筋混凝土结构材料非线性，因为OpenSEES这个软件本身存在的优点能够克服非线性方程组求解过程中稳定性和精确性不够的缺点，此外建立纤维模型可以将构件截面划分，从而同一截面的不同纤维可以有不同的单轴应力应变关系，这样就可以采用更加符合构件受力状态的单轴本构关系，更好的模拟钢筋和混凝土之间的实际工作性能，，经过数值模拟和实际工程试验对比分析得出，OpenSEES具有较好的非线性数值模拟精度和优越性。主要的研究内容如下： 1、将OpenSEES软件应用到桥梁结构来数值模拟材料非线性，阐述OpenSEES软件分析结构非线性的具体过程，包括模型建立、进行非线性分析到结果输出。 2、以钢筋混凝土简支梁单梁为例子，研究用TCL编程方法编辑OpenSEES命令流，在不断增加荷载等级直到结构破坏，分析整个加载过程中荷载和跨中位移以及受拉区纵向钢筋应力随荷载等级的变化过程，并分别用能量等效面积法和通用屈服弯矩法两种方法确定构件的屈服点。 3、以预应力钢筋混凝土简支梁桥为例子，通过用ETABS建模、OpenSEES前处理接口ETO处理生成TCL脚本文件，导入OpenSEES软件分析，研究用刚臂的方法模拟预应力钢筋纤维和混凝土纤维之间的连接，得出加载过程中荷载和跨中位移的变化曲线以及普通梁和预应力梁荷载位移曲线的对比分析。 4、以多梁式简支T梁为例子，建立体系的纤维单元，通过偏载、中载、均匀加载三种方式，分析各梁的材料非线性变化过程。在偏载加载方式下，数值模拟的各梁荷载位移数据分别与破坏性试验数据进行了对比分析，结果相吻合。此外还研究了三种工况下各梁的极限承载能力及受拉区纵向钢筋随荷载等级的变化，各梁通过对比分析确定钢筋的屈服点。 综上所述，通过实例分析表明OpenSEES软件分析非线性不但分析精度高，而且前处理可具有较高的操作性，说明用OpenSEES软件分析材料非线性具有优越性，可以为其他非线性分析提供参考价值。
[Abstract]:Due to the nonlinearity of the materials which make up the prestressed reinforced concrete, the analysis and study of the prestressed reinforced concrete structures by means of elastic mechanics can not meet the requirements of the actual engineering precision. It has become a mainstream trend to use nonlinear method to analyze the material nonlinearity of reinforced concrete structures. In this paper, OpenSEES fiber model is used to analyze the nonlinearity of reinforced concrete structures. Because of the advantages of OpenSEES software, it can overcome the shortcomings of the stability and accuracy in solving the nonlinear equations. In addition, the fiber model can be used to divide the cross-sections of the components. Thus, different fibers of the same section can have different uniaxial stress-strain relationships, so that the uniaxial constitutive relationship, which is more consistent with the stress state of the members, can be used to simulate the actual working performance between steel bars and concrete. Through the comparison and analysis of numerical simulation and practical engineering test, it is concluded that OpenSEES has good accuracy and superiority in nonlinear numerical simulation. The main research contents are as follows: 1. The OpenSEES software is applied to the bridge structure to simulate the material nonlinearity, and the concrete process of analyzing the nonlinear structure by OpenSEES software, including the modeling, is expounded. The nonlinear analysis is carried out to the result output. 2. Taking the single beam of reinforced concrete simply supported beam as an example, the TCL programming method is used to edit the OpenSEES command stream, and the load grade is continuously increased until the structure is destroyed. The variation process of load, mid-span displacement and longitudinal steel bar stress with load grade during the whole loading process is analyzed. The energy equivalent area method and the general yield moment method are used to determine the yield point of the member. 3. Taking the prestressed reinforced concrete simply supported beam bridge as an example, the TCL script file is generated by using ETABS modeling and OpenSEES pre-processing interface ETO processing. This paper introduces OpenSEES software to analyze the connection between prestressed steel fiber and concrete fiber with the method of rigid arm. The variation curves of load and mid-span displacement and the load-displacement curves of common beam and prestressed beam are compared and analyzed. 4. Taking multi-beam simply supported T-beam as an example, the fiber element of the system is established. Three ways of uniform loading are used to analyze the material nonlinear variation process of each beam. Under the eccentric loading mode, the load and displacement data of each beam simulated by numerical simulation are compared with the destructive test data, and the results are in agreement with each other. In addition, the ultimate load-bearing capacity of each beam and the variation of longitudinal reinforcement in tensile zone with load grade under three conditions are also studied. The yield point of steel bar is determined by comparative analysis of each beam. To sum up, the analysis of nonlinearity by OpenSEES software is proved to be not only accurate, but also high maneuverability by pre-processing. It is proved that it is superior to use OpenSEES software to analyze material nonlinearity. It can provide reference value for other nonlinear analysis.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.217
本文编号：2278912
[Abstract]:Due to the nonlinearity of the materials which make up the prestressed reinforced concrete, the analysis and study of the prestressed reinforced concrete structures by means of elastic mechanics can not meet the requirements of the actual engineering precision. It has become a mainstream trend to use nonlinear method to analyze the material nonlinearity of reinforced concrete structures. In this paper, OpenSEES fiber model is used to analyze the nonlinearity of reinforced concrete structures. Because of the advantages of OpenSEES software, it can overcome the shortcomings of the stability and accuracy in solving the nonlinear equations. In addition, the fiber model can be used to divide the cross-sections of the components. Thus, different fibers of the same section can have different uniaxial stress-strain relationships, so that the uniaxial constitutive relationship, which is more consistent with the stress state of the members, can be used to simulate the actual working performance between steel bars and concrete. Through the comparison and analysis of numerical simulation and practical engineering test, it is concluded that OpenSEES has good accuracy and superiority in nonlinear numerical simulation. The main research contents are as follows: 1. The OpenSEES software is applied to the bridge structure to simulate the material nonlinearity, and the concrete process of analyzing the nonlinear structure by OpenSEES software, including the modeling, is expounded. The nonlinear analysis is carried out to the result output. 2. Taking the single beam of reinforced concrete simply supported beam as an example, the TCL programming method is used to edit the OpenSEES command stream, and the load grade is continuously increased until the structure is destroyed. The variation process of load, mid-span displacement and longitudinal steel bar stress with load grade during the whole loading process is analyzed. The energy equivalent area method and the general yield moment method are used to determine the yield point of the member. 3. Taking the prestressed reinforced concrete simply supported beam bridge as an example, the TCL script file is generated by using ETABS modeling and OpenSEES pre-processing interface ETO processing. This paper introduces OpenSEES software to analyze the connection between prestressed steel fiber and concrete fiber with the method of rigid arm. The variation curves of load and mid-span displacement and the load-displacement curves of common beam and prestressed beam are compared and analyzed. 4. Taking multi-beam simply supported T-beam as an example, the fiber element of the system is established. Three ways of uniform loading are used to analyze the material nonlinear variation process of each beam. Under the eccentric loading mode, the load and displacement data of each beam simulated by numerical simulation are compared with the destructive test data, and the results are in agreement with each other. In addition, the ultimate load-bearing capacity of each beam and the variation of longitudinal reinforcement in tensile zone with load grade under three conditions are also studied. The yield point of steel bar is determined by comparative analysis of each beam. To sum up, the analysis of nonlinearity by OpenSEES software is proved to be not only accurate, but also high maneuverability by pre-processing. It is proved that it is superior to use OpenSEES software to analyze material nonlinearity. It can provide reference value for other nonlinear analysis.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.217
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