超高性能混凝土螺栓连接分析

IF 0.1 Q4 ENGINEERING, MULTIDISCIPLINARY
César Echavarría, Hernán Cañola, Wilmar Echeverri
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引用次数: 0

摘要

超高性能混凝土(UHPC)是一种具有显著自密实能力和高抗压强度的复合材料。目前,为了利用其特殊的材料特性,UHPC预制结构被认为是土木工程项目中一个有趣的选择。发现一种实用可靠的方法将UHPC构件与紧固件连接起来,已被认为是未来建设项目的关键因素。本文研究了超高温混凝土节理的应力集中,以预测其脆性破坏模式。实验结果与利用各向异性材料的弹性特性和接头几何形状估计应力集中的解析解进行了比较。研究了端缘距离和弹性性能对UHPC螺栓连接破坏发展的影响。本文提出的基于封闭形式方程的解析解可用于评估应力集中。试验结果与模型预测吻合较好。机械紧固混凝土预制节点的理论分析模型无疑是任何螺栓连接UHPC节点的实验或数值研究的参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analysis of bolted ultra-high performance concrete joints
Ultra-high performance concrete (UHPC) is a composite material which has a remarkable self-compacting ability and highcompressive strength. Currently, UHPC precast construction is considered as an interesting option to take into account for civil engineering projects, in order to make use of its exceptional material properties. Discovering a practical and reliable method of connecting UHPC elements with fasteners has been recognized as a crucial factor in future construction projects. In this paper, the stress concentrations in an UHPC joint to predict brittle failure modes is investigated. Experimental results are compared with an analytical solution, which estimates the stress concentrations using the elastic properties of the anisotropic material and the geometry of the joint. The impact of the end and edge distances and elastic properties on the development of failure is presented for a bolted UHPC joint. The analytical solution proposed here that is based on closed-form equations, can be used to evaluate stress concentrations. Laboratory results on UHPC joints with bolts agree well with the model predictions. A theoretical analytical model for mechanically fastened precast concrete joints is, without a doubt, the reference for any experimental or numerical study of bolted UHPC joints.
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来源期刊
Revista Digital Lampsakos
Revista Digital Lampsakos ENGINEERING, MULTIDISCIPLINARY-
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