多重地震对质量和刚度高度不规则的中层 RC 建筑影响的案例研究

IF 1.7 4区 工程技术 Q3 ENGINEERING, CIVIL
Pavan Kumar Thippa, R. K. Tripathi, Govardhan Bhat
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引用次数: 0

摘要

建筑物中存在的不规则性在承受地震荷载时起着至关重要的作用。在本研究中,考虑了现有的钢筋混凝土(RC)结构,该结构在设计和建造时未考虑不规则性和地震荷载效应。由于功能要求和楼层的其他用途,柱子被移除,这导致了刚度的不规则性,外加荷载差导致了同一楼层的质量不规则性。我们对三种结构进行了分析和比较,以了解现有 RC 结构的地震效应和诱发不规则的倒塌概率。本研究的主要目标是了解多次地震如何影响结构中的诱发不规则性。为了评估结构的性能,我们进行了增量动力分析(IDA),并生成了单震和多震时有无不规则结构的脆性关系。结果比较了三个框架结构的层间漂移比(IDR)、屋顶位移和倒塌概率。分析研究发现,多重地震的影响对不规则结构有至关重要的影响。根据 FEMA 273 标准,不规则结构的中值层间位移达到了 4% 的最大位移阈值。研究结果表明,多次地震的影响很大,应在分析阶段加以考虑,以避免规则和不规则结构的倒塌。应避免在已建结构中引入不规则结构。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

A Case Study on the Effect of Multiple Earthquakes on Mid-rise RC Buildings with Mass and Stiffness Irregularity in Height

A Case Study on the Effect of Multiple Earthquakes on Mid-rise RC Buildings with Mass and Stiffness Irregularity in Height

Irregularities present in buildings play a crucial role when subjected to earthquake loads. In this study, an existing Reinforced Concrete (RC) structure is considered, which is designed and constructed without considering irregularity and seismic load effect. Due to functional requirements and usage of the floor for other occupancy purposes, columns were removed, which resulted in stiffness irregularity, and the imposed load difference resulted in mass irregularity at the same storey level. Three types of structures were analyzed and compared to understand the seismic effects and collapse probability of induced irregularity in existing RC structures. The main goal of this study is to find out how multiple earthquakes affect the induced irregularity in structures. To assess the performance of the structures, Incremental Dynamic Analysis (IDA) is performed, and fragility relationships are generated with and without irregularities for both single and multiple earthquakes. The results are compared in terms of Inter-storey Drift Ratio (IDR), roof displacement, and probability of collapse for three framed structures. The analytical study identifies that the effect of multiple earthquakes has a crucial impact on irregular structures. The irregular structure’s median storey drift has been observed to have attained the maximum drift threshold of 4% as per FEMA 273.The findings highlight the importance of analyzing the structures subjected to multiple earthquakes. The results indicate that multiple earthquakes are significant and should be considered in the analysis phase to avoid the collapse of regular and irregular structures. Introducing irregularity into structures already constructed should be avoided.

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来源期刊
CiteScore
3.30
自引率
11.80%
发文量
203
期刊介绍: The aim of the Iranian Journal of Science and Technology is to foster the growth of scientific research among Iranian engineers and scientists and to provide a medium by means of which the fruits of these researches may be brought to the attention of the world’s civil Engineering communities. This transaction focuses on all aspects of Civil Engineering and will accept the original research contributions (previously unpublished) from all areas of established engineering disciplines. The papers may be theoretical, experimental or both. The journal publishes original papers within the broad field of civil engineering which include, but are not limited to, the following: -Structural engineering- Earthquake engineering- Concrete engineering- Construction management- Steel structures- Engineering mechanics- Water resources engineering- Hydraulic engineering- Hydraulic structures- Environmental engineering- Soil mechanics- Foundation engineering- Geotechnical engineering- Transportation engineering- Surveying and geomatics.
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