Unified design method for seismic resistance of braced steel frames

目前的抗震设计标准，如NBCC 2005，都是基于基于性能的设计理念。基于性能的抗震设计的原则是确保结构在不同烈度的地震作用下能够以期望的方式工作。根据基于性能的设计程序，在概念设计阶段选择单个或多个性能目标。然后，根据所考虑的参数来描述目标性能，这些参数可以是与力相关的参数，也可以是与变形相关的参数。量化了这些参数相对于每种地震危险级别的可接受范围。在概念设计步骤中，确定了结构的布局。在这一步骤中的一个重要问题是确定具有适当耗能元件(EDES)的适当结构体系的屈服机制。

Current seismic design standards, such as NBCC 2005, are based on the concept of the performance-based design. The principle of the performance-based seismic design is to make sure that a structure can perform in a desired manner under various intensities of earthquake. According to the procedure of the performance-based design, single or multiple performance objectives are selected in the conceptual design phase. Then, the target performance is described in accordance with the considered parameters, which can be force-related or deformation-related parameters. Acceptable limits of these parameters with respect to each level of seismic hazard are quantified. In the conceptual design step, layout of the structure is determined. One important issue in this step is to determine the yielding mechanism of a suitable structural system with appropriate energy dissipation elements (EDEs).