新的基于梁的模型用于分析4类钢柱的因火引起的曲
Myriam R Pallares-Muñoz1, Ignacio Paya-Zaforteza2, Antonio Hospitaler-Perez2
1Universidad Surcolombiana, Cra 1 Aven. 26, 410010, Neiva, Colombia.
Heliyon
|March 18, 2024
概括
薄壁钢结构面临着火灾引起的曲风险. 新的梁元件模型 (SbcM和CbcM) 提供了在火灾条件下钢梁柱的曲扭曲 (FTB) 的高效模拟,性能优于复杂的外模型.
科学领域:
- 结构工程 结构工程
- 消防安全工程 消防安全工程
- 计算力学 计算力学 计算力学
背景情况:
- 薄壁钢横截面容易受到火灾引起的曲折不稳定性影响,损害承载能力.
- 目前的欧元代码3规定对于火灾条件是不够的,需要先进的建模技术.
- 现有的梁型模型用于预测火灾下的4类钢梁柱的屈曲扭曲曲 (FTB),对于高偏心,缺乏准确性.
研究的目的:
- 开发和验证低计算成本建模策略,用于模拟4类钢梁柱中的火灾诱导的FTB.
- 为复杂的外有限元 (FE) 模型提供更有效的替代方案.
- 为了提高FTB强度预测在火下与异常负荷的准确性.
主要方法:
- 基于蒂莫申科梁有限元素的两个新型建模策略的开发:单梁柱模型 (SbcM) 和十字形梁柱模型 (CbcM).
- SbcM采用单一线束FE,而CbcM采用束FE的网格,以提高灵活性.
- 在火灾条件下对4类钢梁柱的现有方法进行拟议模型的模拟和比较.
主要成果:
- 无论是SbcM还是CbcM,都有效地模拟了在火灾事件中4类钢梁柱的FTB行为.
- 与传统的外FE模型相比,拟议的光束元素模型提供了显著更快的计算速度.
- 该SbcM表现出特别高效和简单,使其适合复杂的消防工程分析.
结论:
- 开发的基于蒂莫申科梁的模型 (SbcM和CbcM) 提供了精确且计算高效的解决方案,用于在钢梁柱中引发火灾的FTB.
- 在实际的消防工程应用中,SbcM的简单性和有效性的平衡是值得推的.
- 这些模型解决了现有的设计规范和先进的数值技术的局限性,用于与火有关的结构稳定性评估.
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