承台系梁承载能力分析

承台系梁承载能力分析(任务书,开题报告,外文翻译,论文15600字)
摘要
随着社会经济的飞速发展，城市建筑物越来越密集高大，建筑物荷载成倍增加。在城市桥梁建设中，立交桥梁常常需要跨越很多地下结构物，比如说地铁、城市轻轨等等。桩基础在跨越现有结构时，需要采用承台系梁作为连接承台的结构。承台系梁增大了承台的跨越能力，使得城市规划更为便利，因而得到了广泛的应用。
承台系梁的跨高比通常较小，一般来说，我们将其作为深梁来进行设计。本文广泛地查阅了国内外规范和资料，介绍了深梁的概念、受力性能及破坏形态，以宝丰路硚口路26号桥墩的承台系梁作为工程实例，分别使用手算和电算的方法对承台系梁的承载力进行计算，并将几种方法计算的结果进行对比分析。为了深刻了解OpenSees有限元分析方法，本文先用基于柔度法的非线性梁柱单元nonlinearBeamColumn建模并分析构件的承载能力，然后基于有限元分析软件OpenSees中考虑弯剪耦合dispBeanColumnInt单元，对该深梁结构进行了有限元分析，得到了该结构的极限承载能力，并与拉压杆模型方法和我国规范公式法的计算结果进行了对比，分析了两者的结果差异，确定了用dispBeanColumnInt单元分析深梁抗剪承载力的可行性。最后选取了几个深梁的重要参数，分析这几个参数对深梁构件的影响规律。

分析结果表明，随着混凝土强度的提高，深梁的抗剪承载能力会有明显的提高，但提高的幅度会慢慢减小；纵筋的配筋率增大时，承台系梁的承载能力也有明显提升，但提升幅度也会逐渐减缓；当剪跨比为0.5时，即集中荷载作用于跨中时，构件的承载力最小，剪跨比增大或减小，构件的承载力都会提高；跨高比对深梁抗剪能力也有影响，跨高比越大，其抗剪承载力越小。通过本文的研究，我对深梁的力学性质有了更为深刻的理解，掌握了利用拉压杆模型方法对深梁构件的设计计算方法，同时，OpenSees的学习使我的数值模拟分析能力有了提高。
关键字：钢筋混凝土深梁；抗剪承载力；拉压杆模型；OpenSees有限元分析
 
Abstract
With the rapid development of social economy, urban buildings are becoming more and more dense and tall, and the load of buildings is multiplied. In the construction of urban bridges, overpass bridges often need to span many underground structures, such as subway, urban light rail and so on. When the pile foundation crosses the existing structure, the tied beam of the cap should be used as the structure to connect the cap. The tie beams of caps increase the spanning capacity of caps and make urban planning more convenient, so they are widely used. [资料来源：http://Doc163.com]
The Span-to-height ratio of tied beams of caps is usually small. Generally speaking, we design them as deep beams. This paper extensively consults the domestic and foreign codes and materials, introduces the concept, mechanical properties and failure modes of deep beams, takes the tie beams of the cap of pier 26 of Zhekou Road, Baofeng Road as an example, calculates the bearing capacity of tie beams of caps by manual calculation and computer calculation respectively, compares and analyses the results calculated by several methods. In order to deeply understand the OpenSees finite element analysis method, this paper first uses the nonlinearbeamcolumn element that based on flexibility method to model and analyze the load-bearing capacity of the member. Then, based on the finite element analysis software OpenSees, considering the flexural-shear coupling dispBeamColumnInt element, the finite element analysis of the deep beam structure is carried out, and the ultimate load-bearing capacity of the structure is obtained, and compared with the tension-compression bar. Comparing the results of the model method with those of the code formula method in China, the difference between the two results is analyzed, and the feasibility of using dispBean ColumnInt element to analyze the shear capacity of deep beams is determined. Finally, several important parameters of deep beam are selected to analyze the influence of these parameters on deep beam members.
The analysis results show that with the increase of concrete strength, the shear bearing capacity of deep beams will increase obviously, but the increasing range will decrease slowly; with the increase of reinforcement ratio, the bearing capacity of cap tied beams will also increase significantly, but the increasing range will also slow down gradually; when the shear span ratio is 0.5, that is, when concentrated load acts on the middle of the span, the bearing capacity of members is the smallest, and the shear span is the smallest. When the ratio increases or decreases, the bearing capacity of the members will increase, and the Span-to-height ratio also affects the shear capacity of deep beams. The larger the Span-to-height ratio, the smaller the shear capacity. Through this study, I have a deeper understanding of the mechanical properties of deep beams, master the design and calculation methods of deep beams using the tension-compression bar model method, and at the same time, LearningOpenSees has improved my ability of numerical simulation and analysis. [资料来源：http://www.doc163.com]
Key words:reinforced concrete deep beams; shear capacity; tension-compression bar model; OpenSees finite element analysis
  [资料来源：http://doc163.com]

目录
第1章 绪论    1
1.1 深梁的基本概念及实际应用    1
1.2 深梁的受力性能及其破坏形态    1

1.3 钢筋混凝土深受弯构件抗剪理论研究现状    4
1.3.1 国外研究现状    4
1.3.2 国内研究现状    5
1.4 本文研究内容    5
第2章 拉杆-压杆模型设计方法    7
2.1 引言    7
2.2 拉压杆模型的发展概况    7
2.3 拉压杆模型的组成    7
2.4 设计拉压杆模型的基本原则    9
2.5 拉压杆模型设计步骤    9
第3章 承台系梁承载能力计算    11
3.1 根据《混凝土结构设计规范》经验公式计算承载力    11
3.1.1 内力计算    11
3.1.2 正截面受弯承载能力计算    12
3.1.3 斜截面受剪承载力计算    14
3.1.4 局部受压承载力计算    15
3.2 按我国规范的拉压杆模型方法计算承载力    15
3.2.1 加载处和支座处承压验算    16
3.2.2 验算斜压杆 的承载力    17
3.2.3 计算锚固要求    18 [资料来源：http://doc163.com]
3.2.4 抗剪承载力计算：    18
3.3 本章小结    18
第4章 OpenSees有限元分析    19
4.1 浅谈OpenSees    19
4.2 考虑弯剪耦合的梁柱单元    20
4.3 材料的本构关系    21
4.4 承台系梁实例分析    22
4.4.1 承台系梁设计资料    22
4.4.2 非线性梁柱单元建模分析    23
4.4.3 考虑弯剪耦合的梁柱单元建模分析    26
4.5 本章小结    28
第5章 深梁抗剪承载力影响因素分析    29
5.1 混凝土强度的影响    29
5.1.1 参数设计    29
5.1.2 结果分析    29
5.2 受拉钢筋配筋率的影响    31
5.2.1 参数设计    31
5.3 剪跨比的影响    33
5.3.1 参数设计    33
5.3.2 结果分析    33
5.4 跨高比的影响    35
5.4.1 参数设计    35

[资料来源：http://Doc163.com]

5.4.2 结果分析    35
5.5 本章小结    37
第6章 结论与展望    38
6.1 结论    38
6.2 展望    38
参考文献    40
附录 OpenSees命令流    42

[资料来源：https://www.doc163.com]