A plasticity approach to the assessment of shear in concrete beam-and-slab bridges
A plasticity approach to the assessment of shear in concrete beam-and-slab bridges
复制标题
混凝土梁板桥剪力评估的塑性方法
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
C. Middleton
中科院分区：
文献类型：
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作者：
T. Ibell;C. Morley;C. Middleton
本文介绍了一个通用的三维倒塌机制方法的发展，在混凝土梁板桥剪切评估（使用COBRAS）。现有结构抗剪评估的经验规则不允许混凝土结构内的单个梁可能表现出超过其孤立（二维梁）强度的抗剪承载力的增强。一个合理的方法，在其标准形式的塑性理论，适用于这个问题，试图模拟整体的崩溃机制，将发生在混凝土梁板桥的结构实际上失败。一些改进（超过现有的英国评估规范的混凝土桥梁）在预测的剪切强度，这样的structures.While塑性理论依赖于几个假设的怀疑有效性混凝土结构，本方法被证明有潜力作为一个可能的评估工具桥梁。
This paper describes the development of a general 3-dimensional collapse mechanism approach for the assessment of shear in concrete beam-and-slab bridges (using COBRAS). The present empirical rules for shear assessment of existing structures do not allow for the enhancement in shear capacity which an individual beam within a concrete structure might exhibit over and above its isolated (2-dimensional beam) strength. A rational approach, using the theory of plasticity in its standard form, is applied to this problem in an attempt to model the overall collapse mechanism which would have to occur in a concrete beam-and-slab bridge for the structure to actually fail. Some improvement (over the existing British assessment Codes of Practice for concrete bridges) in the predictions for shear strength of such structures is found. While the theory of plasticity relies on several assumptions of doubtful validity for concrete structures, the present method is shown to have potential as a possible assessment tool for bridges.