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Fundamental periods of steel concentrically braced frames designed to Eurocode 8

机译：按照欧洲规范8设计的钢制同心支撑框架的基本周期

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A two-phasp research program has been undertaken to investigate fundamental natural periods of concentrically braced frames (CBFs) designed according to Eurocode 8 (EC8). In the first phase of the program, over 83,700 buildings were designed, and the accuracy of the lower bound expressions given in well-known design specifications was evaluated. The results indicated that the lower bound expressions given in EC8 and National Building Code of Canada (NBCC) are acceptable. Although all structures had periods longer than the ones estimated by the EC8 expression, a few structures had shorter periods than the ones estimated by the NBCC expression. In general, the lower bound expressions given in EC8 and NBCC were found to provide over conservative estimates for most cases. In the second phase of the program, a simple hand method was developed to estimate the fundamental natural periods of CBFs designed to EC8. This method requires the use of inelastic top story drift ratio as a parameter to quantify stiffness characteristics. The drift ratios were extracted from the design pool developed as a part of the first phase and represented by simple mathematical relationships. Evaluation of the proposed method indicated that the method is accurate in providing estimates of the fundamental period. To safeguard against providing unconservative estimates, the method was modified to arrive at a new lower bound expression, which significantly improves the estimates compared with the ones provided by the existing expressions.
机译：已经进行了两阶段研究计划，以研究根据欧洲规范8（EC8）设计的同心支撑框架（CBF）的基本自然周期。在该计划的第一阶段，设计了83,700多座建筑物，并评估了著名设计规范中给出的下界表达式的准确性。结果表明，EC8和加拿大国家建筑法规（NBCC）中给出的下限表达式是可以接受的。尽管所有结构的周期都比EC8表达式估计的周期长，但有些结构的周期比NBCC表达式估计的周期短。通常，在大多数情况下，发现EC8和NBCC中给出的下限表达式提供了超出保守估计的值。在该程序的第二阶段，开发了一种简单的手工方法来估算针对EC8设计的CBF的基本自然周期。此方法需要使用非弹性顶层位移率作为量化刚度特性的参数。漂移比是从作为第一阶段一部分开发的设计库中提取的，并由简单的数学关系表示。对提出的方法的评估表明，该方法在提供基本周期的估计中是准确的。为了防止提供不保守的估计，对该方法进行了修改，以得到一个新的下界表达式，与现有表达式提供的估计相比，该表达式显着改善了估计。

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