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Seismic reliability of traditional and innovative concentrically braced frames

机译：传统和创新同心支撑框架的抗震可靠性

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摘要

Structural engineering problems are always affected by many sources of uncertainty, such as aleatory of material properties, applied loads and earthquake intensity, therefore, seismic assessment of structures should be based on probabilistic methods. Since PBSD (Performance-based Seismic Design) philosophy was formulated, many researches have been conducted in this field in order to develop simple and accurate procedures for evaluating structural reliability. An important contribution has been provided by Jalayer and Cornell, who have developed a closed-form expression to evaluate the mean annual frequency of exceeding a defined limit state. In this paper, by assuming the record-to-record variability as the only source of uncertainty, the seismic reliability of concentrically braced frames designed according to traditional and innovative methodologies is investigated, and a comparison between their performances is presented. In particular, two design methodologies have been applied: Eurocode 8 provisions and a new design methodology based on a rigorous application of 'capacity design' criteria. The innovative reduced section solution strategy, based on the reduction of cross sections at bracing member ends, has also been analysed.
机译：结构工程问题总是受到许多不确定性因素的影响，例如材料特性的反复性，施加的载荷和地震烈度，因此，结构的地震评估应基于概率方法。自从制定PBSD（基于性能的抗震设计）哲学以来，在该领域进行了许多研究，以开发用于评估结构可靠性的简单而准确的程序。 Jalayer和Cornell提供了重要的贡献，他们开发了一种封闭形式的表达式来评估超过定义的极限状态的年平均频率。在本文中，以记录间的可变性为唯一不确定性来源，研究了根据传统和创新方法设计的同心支撑框架的抗震可靠性，并对其性能进行了比较。特别是，已经应用了两种设计方法：欧洲规范8的规定和基于严格应用“容量设计”标准的新设计方法。还分析了基于减小支撑构件端部横截面的创新型减小截面的解决方案策略。

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