Numerical Study on High Strength Q690 Steel Flush End-Plate Connections at Elevated Temperatures

IF 2.3 3区工程技术 Q2 ENGINEERING, MULTIDISCIPLINARY Fire Technology Pub Date : 2024-03-23 DOI:10.1007/s10694-024-01568-y

Weiyong Wang, Siqi Li, Tian Ran

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Abstract

Exploring fire resistance of high strength steel end-plate connections is one of the key technical bases for fire resistance design and fire safety assessment of high strength steel structures. Numerical simulation and parameter analyses of high strength Q690 steel flush end-plates will contribute to a reasonable design of high strength flush end-plate connections. In this paper, a finite element model of high strength steel flush end-plate connection considering thermal creep effect was established and validated by experimental results. The thermal creep finite element model can simulate accurately heat performance, failure modes and deformations of high strength flush end-plate connections at elevated temperatures. The increase of axial compression ratio has little effect on rotation, deflection, failure time, critical temperature, and critical rotation with elevated temperatures. The increase of bending moment ratio has little effect on the development trend of rotation and deflection. Proper increase of thickness of the end-plate can improve failure time and critical rotation, and the increase range is within 7% and 36% respectively. Proper increase of diameter of bolt can improve failure time, critical temperature, and critical rotation to a certain extent, and the increase range is within 10%, 6% and 27% respectively. Proper increases of thickness of the end-plate and diameter of bolt will improve the fire resistance of flush end-plate connection.

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高温下高强度 Q690 钢齐平端板连接的数值研究

探索高强度钢端板连接的耐火性能是高强度钢结构耐火设计和防火安全评估的关键技术基础之一。对高强度 Q690 钢齐平端板进行数值模拟和参数分析，有助于高强度齐平端板连接的合理设计。本文建立了考虑热蠕变效应的高强度钢平齐端板连接有限元模型，并通过实验结果进行了验证。热蠕变有限元模型可以准确模拟高强度齐平端板连接在高温下的热性能、破坏模式和变形。轴向压缩比的增加对高温下的旋转、挠度、失效时间、临界温度和临界旋转影响不大。弯矩比的增加对旋转和挠度的发展趋势影响不大。适当增加端板厚度可改善失效时间和临界旋转，增加幅度分别在 7% 和 36% 以内。适当增加螺栓直径可在一定程度上改善失效时间、临界温度和临界旋转，增加幅度分别在 10%、6% 和 27% 之间。适当增加端板厚度和螺栓直径可提高齐平端板连接的耐火性能。

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来源期刊

Fire Technology 工程技术-材料科学：综合

CiteScore

6.60

自引率

14.70%

发文量

137

审稿时长

7.5 months

期刊介绍： Fire Technology publishes original contributions, both theoretical and empirical, that contribute to the solution of problems in fire safety science and engineering. It is the leading journal in the field, publishing applied research dealing with the full range of actual and potential fire hazards facing humans and the environment. It covers the entire domain of fire safety science and engineering problems relevant in industrial, operational, cultural, and environmental applications, including modeling, testing, detection, suppression, human behavior, wildfires, structures, and risk analysis. The aim of Fire Technology is to push forward the frontiers of knowledge and technology by encouraging interdisciplinary communication of significant technical developments in fire protection and subjects of scientific interest to the fire protection community at large. It is published in conjunction with the National Fire Protection Association (NFPA) and the Society of Fire Protection Engineers (SFPE). The mission of NFPA is to help save lives and reduce loss with information, knowledge, and passion. The mission of SFPE is advancing the science and practice of fire protection engineering internationally.