箱梁结构完整验算应力和空间网格模型

发布时间：2019-06-15 12:57

【摘要】：现行规范所规定的验算应力仅是针对一根薄腹窄梁的,并不能反映现代复杂桥梁结构的真实受力情况。设计方法中的验算应力不完整造成了现行规范体系的计算结果存有漏洞和缺失,使得有些常见开裂病害无法从现有设计计算框架中找到答案。列出了一个箱梁结构需要关注的完整的验算应力以及对应的裂缝形式,并且提出完整验算应力的表达方式。空间网格模型能够完整地反映所有的验算应力,是最为全面实用的精细化模型。通过比较空间网格模型和实体模型的计算结果,说明了空间网格模型能反映包括剪力滞效应、薄壁效应和局部效应在内的荷载效应。通过空间网格模型计算得到的混凝土桥梁结构的完整验算应力,可以更完整把握结构受力特征、了解结构中可能出现问题的地方,也可以更确切地分析出现问题的原因以及为解决相应问题提供依据。
[Abstract]:The checking stress stipulated in the current code is only aimed at a thin web narrow beam and can not reflect the real force of the modern complex bridge structure. The incomplete checking stress in the design method results in loopholes and deficiencies in the calculation results of the current specification system, so that some common cracking diseases can not be found in the existing design and calculation framework. This paper lists the complete checking stress and the corresponding crack form that need to be paid attention to in a box girder structure, and puts forward the expression of the complete checking stress. The spatial grid model can completely reflect all the calculated stresses, and it is the most comprehensive and practical fine model. By comparing the calculation results of spatial grid model and solid model, it is shown that the spatial grid model can reflect the load effects, including shear lag effect, thin wall effect and local effect. The complete checking stress of concrete bridge structure calculated by spatial grid model can grasp the stress characteristics of the structure more completely, understand the possible problems in the structure, and also analyze the causes of the problems more accurately and provide the basis for solving the corresponding problems.
【作者单位】：同济大学;
【分类号】：U448.213;U441

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