ABSTRACT

As a matter of fact, structural drift is a random variable that is associated with several bases of the uncertainties related to the loading excitation and structural resistance. Hence, it seems essential to utilize the probabilistic philosophy to provide a design criterion of control the structural drift. The current study was conducted to propose a probabilistic approach to control the structural drift subjected to seismic loading. The main contribution of this manuscript is to propose a new sophisticated design criterion to control the structural drift using the reliability analysis. As-a-state-of-the-art, a new limit state function is established to be utilized for reliability analysis of the considered extreme event. To do so, several different steel frames are analyzed and investigated using the existing design criterion of the ASCE07 code. Also, the analysis of the critical excitations is conducted to deliberate the required target reliability indices for the considered limit state function. Accordingly, the reliability index spectrum is illustrated which revealed that the drift of the structures is related to the fundamental structural period. Eventually, based on the consistency of the reliability index consideration a stylish formula is proposed to control the drift reliability index corresponding to the target reliability indices constraints in the range of 2 to 4 (2 ≤ β ≤ 4). In addition to the main advantage of the proposed design criterion which is to provide a consistent range of the reliability level for different structures. Indeed, the analysis of the critical excitation shows that the reliability index spectrum varies by the fundamental frequency of the structure. Hence, in this research, a new structural drift criterion was proposed to sophisticatedly present the design criterion based on the fundamental structural period. Also, the proposed design criterion contains the deflection amplification factor to conclude the comprehensive inter-story drift control.

摘要

事实上，结构漂移是一个随机变量，它与加载激励和结构阻力相关的几个不确定性基础相关联。因此，似乎有必要利用概率哲学来提供控制结构漂移的设计标准。目前的研究旨在提出一种概率方法来控制承受地震载荷的结构漂移。这份手稿的主要贡献是提出了一种新的复杂设计标准，以使用可靠性分析来控制结构漂移。作为最先进的技术，建立了一个新的极限状态函数，用于对所考虑的极端事件进行可靠性分析。为此，使用 ASCE07 规范的现有设计标准分析和研究了几种不同的钢框架。此外，对临界激励进行分析以考虑所考虑的极限状态函数所需的目标可靠性指标。相应地，说明了可靠性指标谱，表明结构的漂移与基本结构周期有关。最后，基于可靠性指标一致性的考虑，提出了一个时尚的公式，将目标可靠性指标约束对应的漂移可靠性指标控制在2到4（2≤β≤4）的范围内。除了所提出的设计标准的主要优点是为不同的结构提供一致的可靠性水平范围之外。事实上，对临界激励的分析表明，可靠性指数谱随结构的基频而变化。因此，在这项研究中，提出了一种新的结构漂移准则，以复杂地呈现基于基本结构周期的设计准则。此外，提出的设计准则包含挠度放大系数，以得出综合层间漂移控制。