高温下工字梁的弯曲设计曲线:屈服或局部屈曲破坏模式的工字梁

Akbar Rasoulnia, Vahid Broujerdian, Ali Ghamari, Abbas Ghadami
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引用次数: 0

摘要

本文研究了高温纯弯矩作用下工字梁的结构性能和极限抗弯强度。提出了一种新的基于弯曲设计曲线的工字梁抗弯性能预测和极限抗弯强度估算方法。该程序的主要策略是通过量化和制定温度升高的影响来找到i型梁的环境温度当量。拟议的程序包括整体和部分阶段。前一阶段处理等效横向不支撑长度的确定,后一阶段处理等效腹板和压缩法兰长细度参数的确定。为使设计曲线适应高压缩法兰长细比参数和高温下残余应力的影响,确定了标定系数。为了得到比较结果,对216个有限元模型进行了数值分析。在216个不同截面单元的有限元模型中,有54个模型是专门针对工字梁屈服破坏或局部屈曲破坏模式的,本文报道了这些模型的结果。通过数据拟合分析,获得了标定系数随压缩法兰长细比参数的变化规律。通过标定所提出的设计程序,结果收敛,因此,数值结果和参数结果之间达到了很好的一致性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Flexural design curves of steel plate I-girders at elevated temperatures: I-girders with yield or local buckling failure mode
The present study was undertaken to characterize the structural behavior and ultimate flexural strength of steel plate I-girders under pure flexural moment at elevated temperatures. A novel design procedure along with flexural design curves was proposed to predict the flexural behavior of the I-girders and estimate corresponding ultimate flexural strengths. The main strategy of the procedure is to find an ambient-temperature equivalent of the I-girder by quantifying and formulating the effects of elevated temperatures. The proposed procedure comprises overall and partial phases. The former phase deals with the determination of equivalent laterally unbraced length, and the latter phase addresses the equivalent web and compression flange slenderness parameters. The calibration factor was defined to adapt the design curves to the effects of high compression flange slenderness parameters and residual stress at elevated temperatures. To generate comparative results, a numerical study was conducted by analyzing 216 finite element (FE) models. Fifty-four out of 216 FE models with different cross-sectional elements were dedicated to the I-girders fail by yield or local buckling failure mode, the results of which are reported in the present paper. Data fitting analysis was carried out to capture the variation of calibration factor with respect to compression flange slenderness parameters. By calibrating the proposed design procedure, the results were converged and, therefore, good conformity was reached between the numerical and parametric results.
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