不同端部约束水平偏心受压细长RC柱在高温下的侧向变形行为

IF 0.9 Q4 CONSTRUCTION & BUILDING TECHNOLOGY
K. Mahmoud
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引用次数: 1

摘要

在文献中,先前的研究主要集中在分析具有理想端部条件的钢筋混凝土(RC)柱在火灾中的作用。在本质上,在柱端不能达到完全固定或自由旋转。这样的端部可以认为在转动上部分受限。本文旨在揭示不同程度的旋转约束对细长加热RC柱侧向变形行为的影响,这些柱受到由时间相关温度历史产生的非线性应变分布的影响。设计/方法/方法为了得到截面上的应变分布,采用了牛顿-拉夫森迭代法。通过引入可靠的计算程序,采用数值和搜索技术表达了横向变形行为。提出了一种计算高温下钢筋混凝土柱有效长度因子的方法。结果:模型的计算结果与已有的实验结果吻合较好。研究还发现,转动端约束水平的变化对受热细长RC柱的侧向变形行为有相当大的影响。此外,分析模型的有效性和有效性应通过同时验证轴向和侧向变形来验证。加热柱的有效长度因子高于常温下相应柱的有效长度因子。本文研究了不同边界条件对细长钢筋混凝土受热柱性能的影响。这为确定高温下的侧向挠度和有效长度因子提供了强有力的技术建议。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Lateral deformation behavior of eccentrically loaded slender RC columns with different levels of rotational end restraint at elevated temperatures
Purpose In literature, previous studies have focused on analyzing rienforced concrete (RC) columns with idealized end conditions when subjected to fire. In nature, full fixity or free rotation at column ends is not attained. Such ends may be considered partially restrained in rotation. This paper aims to shed a new light on the effect of different degrees of rotational restraint on the lateral deformation behavior of slender heated RC columns subjected to non-linear strain distributions produced by a time-dependent temperature history. Design/methodology/approach To find the strain distribution on the cross section, an iterative technique is adopted using Newton–Raphson method. By introducing a reliable calculation procedure, the lateral deformational behavior is expressed using numerical and searching techniques. A methodology is presented to calculate the effective length factor for RC columns at elevated temperature. Findings The results of the proposed model showed good agreement with available experimental test results. It was also found that the variation of rotational end restraint level has a considerable effect on the lateral deformation behavior of heated slender RC columns. In addition, the effectiveness and the validity of an analytical model should be verified by simultaneously validating the axial and lateral deformations. Moreover, the effective length factor for heated column is higher than that for the corresponding column at ambient temperature. Originality/value This paper shows the impact of different boundary conditions on the behavior of heated slender RC columns. It suggests powerful techniques to determine the lateral deflection and the effective length factor at high temperatures.
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来源期刊
Journal of Structural Fire Engineering
Journal of Structural Fire Engineering CONSTRUCTION & BUILDING TECHNOLOGY-
CiteScore
2.20
自引率
10.00%
发文量
28
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