Abstract Diagrid structural systems have been brought into attention among architectures and engineers during recent years due to high structural efficiency and aesthetic potentials. Therefore, seismic behavior of diagrid structural systems under near and far-field earthquakes is investigated in this paper based on energy approach concepts in order to achieve a better understanding of their seismic behavior and the advantages of utilizing energy methods. For this aim, a 50-story building is modeled with a finite element method and its behavior is investigated through the Incremental Dynamic Analysis (IDA) method. Maximum story drifts, and plastic strain energy are studied as the engineering demand parameters (EDP). In addition, a fragility assessment method of the structure is presented with the aid of plastic strain energy and is compared to the fragility curves of maximum story drifts. This paper illustrates that the energy method can be applied to calculate the probability of the structure to exceed four performance levels including elastic, LS, CP and global instability. The results indicate that the fragility of the structure in far-field earthquakes is more than near-field ones in both maximum story drift and energy methods. Moreover, the fragility curves resulted from the energy method in LS and Instability levels have acceptable correspondence with the curves from the maximum story drift method, while the energy approach presents more conservative results in the CP level. It is demonstrated that the plastic strain energy can be considered as an appropriate parameter as EDP in the fragility evaluation of structures.

中文翻译：

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基于能量法的斜交网格结构抗震易损性评价

摘要 近年来，斜交格结构系统因其高的结构效率和美观的潜力而受到建筑和工程师的关注。因此，本文基于能量方法的概念研究了斜交网格结构系统在近场和远场地震下的抗震行为，以更好地了解其抗震行为和利用能量方法的优势。为此，我们使用有限元方法对 50 层建筑进行建模，并通过增量动态分析 (IDA) 方法研究其行为。最大层位移和塑性应变能作为工程需求参数 (EDP) 进行研究。此外，借助塑性应变能，提出了一种结构的脆性评估方法，并与最大层位移的脆性曲线进行了比较。本文说明能量法可用于计算结构超过弹性、LS、CP 和全局不稳定性四个性能水平的概率。结果表明，无论是在最大层移法还是能量法中，远场地震中结构的脆性均大于近场地震。此外，能量法在 LS 和不稳定性水平下得到的脆性曲线与最大楼层漂移法得到的曲线具有可接受的对应关系，而能量法在 CP 水平上呈现出更保守的结果。