通过考虑未合的频率比率来考虑设计异心率的替代建议
1Department of Civil Engineering, Nevsehir Haci Bektasi Veli University, Nevsehir, Turkey. oakyurek@nevsehir.edu.tr.
Scientific reports
|December 27, 2024
概括
对于地震设计异常度的新公式通过考虑频率比和旋转的有效半径来提高准确性. 与现行法规规定相比,这种方法可以更好地了解土木结构中的扭曲不规则性.
科学领域:
- 土木工程 土木工程是指土木工程.
- 结构动力学 结构动力学
- 地震工程的工程是地震工程.
背景情况:
- 民用结构面临风力和地震活动等动态负载,导致由于质量中心 (CM) 和刚性中心 (CR) 的 misalignment 导致扭曲问题,称为异心.
- 地震设计代码通过固有的 (几何) 和偶然的类型来解决异常,通常使用基于百分比的假设 (5%或10%) 来处理偶然的异常来管理不确定性.
研究的目的:
- 提出一种新的设计异常度公式,作为替代目前用于地震设计的代码参数.
- 将频率比率 (扭转频率与转换频率) 和旋转有效半径纳入离心率计算,以更好地考虑扭转不规则性.
主要方法:
- 开发了一个新的设计离心率公式,考虑频率比和旋转的有效半径.
- 通过使用18个模型建筑在6个楼层计划 (低层,中层和高层;3,7层和12层) 中验证了拟议的方法.
- 在受双向地震地面运动影响的模型建筑上进行时间历史分析.
主要成果:
- 与代码提供方法相比,拟议的方法在估计扭矩离心率的影响方面表现出更高的有效性.
- 拟议方法的结果与时间历史分析结果相比,与等效横向力程序相比,与时间历史分析结果更好地保持一致.
- 该研究提供了有关扭矩偏心如何影响结构动态特征的更深入的见解.
结论:
- 新型设计异常度公式提供了一个更准确,更有洞察力的方法来计算土木结构中的扭力效应.
- 这种方法提供了一个优越的替代方案,以假设为基础的意外异常在地震设计代码.
- 这些发现有助于更好地理解和减轻受动负荷影响的建筑物中扭曲不规则的情况.
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