Abstract This paper presents an assessment of steel buildings subjected to post-earthquake fire, illustrated through the implementation of a ten-story case study building, which was designed in accordance with U.S. design codes. The building is located in a high seismic region (Los Angeles, CA), and designed for the associated seismic hazard levels using perimeter special moment frames (SMFs) to resist lateral (wind and seismic) loading and gravity interior frames with composite floor systems to resist gravity (dead and live) loading. The entire 3D building structure was idealized and analyzed using finite element models capable of modeling inelastic deformations, instability failures, and connection damage due to earthquakes and fire. The building models were subjected to eleven earthquakes followed by three different fire scenarios to simulate the effects of post-earthquake fires. The results from post-earthquake fire analyses were used to assess the impact of earthquake-induced damage on structural behavior and stability during fire. Assessments indicate that, for the type and design of structure considered in this research, earthquake-induced damage is generally limited to the perimeter moment frames and has limited influence on post-earthquake fire performance, which is governed by the strength and stability of gravity columns and floor systems. Analytical parametric studies were conducted to further assess and develop performance-based design guidelines for improving structural behavior and stability during post-earthquake fires. These studies indicate that partial or full collapse of the building structure can be prevented by sufficiently increasing the structural design (size) or fire protection (fireproofing thickness) of the critical gravity columns.

中文翻译：

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钢结构建筑震后火灾行为及性能化防火设计

摘要 本文通过根据美国设计规范设计的十层案例研究建筑的实施来说明对遭受地震后火灾的钢结构建筑的评估。该建筑位于高地震区（加利福尼亚州洛杉矶），设计用于相关地震危险等级，使用周边特殊力矩框架 (SMF) 来抵抗横向（风和地震）载荷和重力内部框架与复合地板系统抵抗重力（死的和活的）载荷。使用有限元模型对整个 3D 建筑结构进行了理想化和分析，这些模型能够对地震和火灾引起的非弹性变形、失稳失效和连接损坏进行建模。建筑模型经受了 11 次地震，然后是三种不同的火灾场景，以模拟地震后火灾的影响。地震后火灾分析的结果用于评估地震引起的损坏对火灾期间结构行为和稳定性的影响。评估表明，对于本研究中考虑的结构类型和设计，地震引起的破坏通常仅限于周边力矩框架，对震后防火性能的影响有限，受重力柱的强度和稳定性控制和地板系统。进行了分析参数研究，以进一步评估和制定基于性能的设计指南，以改善地震后火灾期间的结构行为和稳定性。