预应力对混凝土宽箱梁剪力滞效应影响的分析和研究

发布时间：2018-01-06 01:28

本文关键词：预应力对混凝土宽箱梁剪力滞效应影响的分析和研究　出处：《苏州科技学院》2015年硕士论文　论文类型：学位论文

【摘要】：随着城市建设和交通运输业的快速发展,交通基础设施建设规模日益加大。三向预应力混凝土宽箱梁在国内外已得到高速发展。虽然三向预应力的混凝土宽箱梁具有良好的结构性能,但是由于三向预应力的使用,致使混凝土宽箱梁的受力更为复杂,尤其是考虑了剪力滞效应对结构的影响。为了明确纵向预应力对混凝土宽箱梁剪力滞效应的影响,本文首先基于将多室宽箱梁先离散后组合的思路,依据能量变分法和将预应力转换为等效荷载的原则进行了理论推导,给出了理论计算方法和公式。并通过算例,用有限元分析验证了公式的可靠性,最后给出分析结论以及实际设计建议。随后本文进行了横向、竖向预应力对混凝土宽箱梁剪力滞效应影响的有限元分析和研究。研究以苏州市中环快速路工程园区段星华街一标段主线上一联等宽连续现浇箱梁为工程实例。利用Midas Civil和FEA分别建立本联箱梁的纵向杆系有限元模型和实体单元有限元模型,对其进行分析。结果表明在混凝土等宽连续箱梁桥中设置横向预应力,其对剪力滞效应的影响是不可忽略的。横向预应力致使箱梁顶板产生类似正剪力滞,底板产生类似负剪力滞。而在混凝土等宽连续箱梁桥中设置竖向预应力,其对剪力滞效应的影响是可以忽略不计的。
[Abstract]:With the rapid development of city construction and transportation, transportation infrastructure construction scale increasing. Three prestressed concrete wide box girder at home and abroad has been rapid development. Although the three to prestressed concrete wide box girder structure has good performance, but due to the use of three prestressed concrete wide box girder, resulting in the the force is more complex, especially considering the shear lag effect in structure. In order to clarify the effect of longitudinal prestressed concrete wide box beam shear lag effect, based on the multi room wide box girder of discrete combination of ideas, based on the energy variational method and the principle of prestressed equivalent loads are converted to the theory, method and calculation formula are given. The theory and the example, using finite element analysis to verify the reliability of the formula, finally gives the research conclusion and suggestions. With the actual design This paper makes a horizontal, finite element analysis and Study on the influence of vertical prestressed concrete wide box beam shear lag effect. In order to study the Central Expressway Engineering Park section of Suzhou street, a section of the main line Dominic has a joint width continuous cast-in-place box beam as an example. Respectively establish finite element model of finite element model and unit the entity header beam by Midas Civil and FEA, carries on the analysis. The results show that the transverse width of prestressing in concrete continuous box girder bridge, the influence of shear lag effect can not be neglected. The transverse prestressed box girder top plate have similar positive shear lag, the bottom has a similar negative shear lag. But in the concrete to set the width of vertical prestressed continuous box girder bridge, the influence of the shear lag effect is negligible.

【学位授予单位】：苏州科技学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441

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