Steel and Concrete Elasto-Plastic Models at Bridges with Steel Beams Embedded in Concrete

IF 0.1 Q4 ENGINEERING, CIVIL
Stănescu Răzvan Marian
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Abstract

Abstract For new railway bridges with short spans (L ≤ 35.00 m) superstructures with steel beams embedded in concrete are recommended or used, which can ensure the requirements of strength and stiffness in particular, regardless of velocity. They are built relatively easily compared to reinforced concrete structures or steel structures, they have high durability if designed, built and maintained correctly and don’t have high sensitivity to fatigue degradation in service. They are also used for road bridges when it is desired to achieve a reduced construction height. In all the design prescriptions used so far for structures with steel beams embedded in concrete, the calculation is a simplified one, made on a single insulated longitudinal beam of the deck, if certain conditions related to the geometry of the structure are met (obliquity, curvature). Simplifications are also made regarding the state of deformation of the decks made in this constructive solution by introducing an effective moment of inertia in the displacement calculation, as an average of the inertia moments of the cross section considered to be cracked and respectively un-cracked. The article aims to validate steel and concrete elasto-plastic models, based on an experiment from the technical literature, necessary for complex analyses of the percentage of concrete involved in the stiffness of the cross-sections, in case of bridges with steel beams embedded in concrete.
混凝土中埋有钢梁的桥梁的钢和混凝土弹塑性模型
摘要对于短跨度(L≤35.00m)的新建铁路桥梁,建议或使用混凝土中嵌入钢梁的上部结构,无论速度如何,都能特别确保强度和刚度的要求。与钢筋混凝土结构或钢结构相比,它们的建造相对容易,如果设计、建造和维护正确,它们具有很高的耐久性,并且在使用中对疲劳退化没有很高的敏感性。当希望实现降低的施工高度时,它们也用于道路桥梁。在迄今为止用于混凝土中嵌入钢梁的结构的所有设计规定中,如果满足与结构几何形状相关的某些条件(倾斜度、曲率),则在甲板的单个隔热纵梁上进行的计算是简化的。通过在位移计算中引入有效惯性矩,作为被认为有裂纹和未裂纹的横截面惯性矩的平均值,还对该构造解中的甲板变形状态进行了简化。本文旨在验证基于技术文献中的实验的钢和混凝土弹塑性模型,该模型对于复杂分析混凝土在横截面刚度中所占的百分比是必要的,如果桥梁的钢梁嵌入混凝土中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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