RC框架结构办公建筑韧性影响因素分析

ANALYSIS ON FACTORS AFFECTING THE RESILIENCE OF A RC FRAME STRUCTURE OFFICE BUILDING

  • 摘要: 基于《建筑抗震韧性评价标准》GB/T 38591−2020,该文对一栋7度(0.1g)抗震设防、采用高强混凝土的RC框架结构高层办公建筑进行了抗震韧性评价,定量分析了提高结构体系阻尼比(模拟消能加固)、改变结构构件抗震性能、改变非结构构件抗震性能、提高电梯抗震性能参数对该框架结构建筑震后修复费用、修复时间和人员伤亡的影响,以及抗震韧性评价结果的变化。结果表明,通过消能加固技术提高结构体系的阻尼比可明显降低结构的地震响应,三个韧性评价指标均呈现不同程度的下降;改变结构构件抗震性能对建筑修复时间和人员伤亡的影响显著高于非结构构件抗震性能变化的影响,提升结构构件的抗震性能可使修复时间和人员伤亡大幅下降;非结构构件抗震性能变化对建筑震后修复费用的影响显著高于结构构件,提升非结构构件的抗震性能可使修复费用大幅下降;提高电梯抗震性能参数可以显著缩短修复时间。研究结果可为不同目标导向的建筑抗震韧性提升设计提供参考。

     

    Abstract: Based on the "Standard for seismic resilience assessment of buildings" GB/T 38591−2020, the seismic resilience of a high-rise RC frame structure office building with high-strength concrete in 7-degree (0.1g) fortification earthquake zone was evaluated in this research. A quantitative analysis was conducted on the resilience assessment indicators of post-earthquake repair cost, repair time and personnel casualties, as well as the changes in the seismic toughness evaluation results, in terms of improving the damping ratio of the structural system (energy dissipation retrofitting), changing the seismic performance of structural and non-structural components, and changing the seismic performance parameters of elevator. The results show that increasing the damping ratio of the structural system through energy dissipation retrofitting technology can significantly reduce the seismic response of the structure, and the three resilience indexes show varying degrees of decline. The impact of changes in structural component on building repair time and personnel casualties is significantly higher than that of non-structural components. Improving the seismic performance of the structural components can significantly reduce repair time and personnel casualties. The impact of changes in seismic performance of non-structural components on post-earthquake repair costs is significantly higher than that of structural components. Enhancing the seismic performance of non-structural components can significantly reduce repair costs. Moreover, improving the seismic performance parameters of elevators can significantly shorten the repair time. The research results can provide guidance for improving seismic resilience design of buildings with different targets.

     

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