典型和非典型钢筋混凝土框架结构建筑的渐进式坍塌

IF 3.6 3区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY International Journal of Concrete Structures and Materials Pub Date : 2024-04-20 DOI:10.1186/s40069-024-00665-0
Solomon Abebe Derseh, Tesfaye Alemu Mohammed, Girum Urgessa
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引用次数: 0

摘要

本文研究了具有几种非典型结构配置的八层钢筋混凝土框架建筑的渐进式倒塌潜力,并将结果与典型结构配置进行了比较。本文采用了替代荷载路径机制、通过动态增加系数放大的线性静态分析程序以及美国总务管理局指南中的需求容量比标准限制来评估不同的非典型和典型框架结构的脆弱性。不同的凹槽大小、平面不规则性和紧密间隔的柱子被用来代表非典型结构配置。提取的全局结构响应需求容量比(DCR)显示,短跨梁纵向框架的需求容量比大于长梁跨横向框架的需求容量比,具有显著的渐进式坍塌潜力。此外,柱间距较近的非典型建筑结构因受剪而倒塌,并显示出最高的 DCR 限值。除整体结构响应外,还对局部构件端部作用进行了评估。评估结果表明,与基线典型框架结构相比,柱间距较近的临界非典型框架结构的最大剪力和支撑弯矩值分别相差 91% 和 127%。
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Progressive Collapse of Typical and Atypical Reinforced Concrete Framed Buildings

This paper investigates the progressive collapse potential of eight-story reinforced concrete framed buildings with several atypical structural configurations and compares results with a typical structural configuration. The alternative load path mechanism, the linear-static analysis procedure amplified by dynamic increase factors, and the demand capacity ratio criterion limits from the U.S. General Services Administration guideline were used to evaluate the vulnerability of the different atypical and typical framed structures. Variations in bay size, plan irregularity, and closely spaced columns were used to represent the atypical structural configurations. The extracted demand-capacity ratio (DCR) of the global structural response showed that the demand-capacity ratio for the longitudinal frame with short-span beams had a larger DCR than the transverse frame with longer beam spans with significant potential for progressive collapse. Furthermore, atypical building configurations with closely spaced columns failed by shear and showed the highest DCR limits. In addition to the global structural response, the local member end actions were also evaluated. The evaluation showed that the critical atypical frame configuration with closely spaced columns had a 91% and 127% maximum shear force and support bending moment value difference, respectively, when compared to a baseline typical frame configuration.

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来源期刊
International Journal of Concrete Structures and Materials
International Journal of Concrete Structures and Materials CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL
CiteScore
6.30
自引率
5.90%
发文量
61
审稿时长
13 weeks
期刊介绍: The International Journal of Concrete Structures and Materials (IJCSM) provides a forum targeted for engineers and scientists around the globe to present and discuss various topics related to concrete, concrete structures and other applied materials incorporating cement cementitious binder, and polymer or fiber in conjunction with concrete. These forums give participants an opportunity to contribute their knowledge for the advancement of society. Topics include, but are not limited to, research results on Properties and performance of concrete and concrete structures Advanced and improved experimental techniques Latest modelling methods Possible improvement and enhancement of concrete properties Structural and microstructural characterization Concrete applications Fiber reinforced concrete technology Concrete waste management.
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