Comparison of monotonic and cyclic pushover analyses for the near-collapse point on a mid-rise reinforced concrete framed building

IF 1.4 4区 工程技术 Q3 ENGINEERING, CIVIL Earthquakes and Structures Pub Date : 2020-09-01 DOI:10.12989/EAS.2020.19.3.189
N. Gunes
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引用次数: 1

Abstract

The near-collapse performance limit is defined as the deformation at the 20% drop of maximum base shear in the decreasing region of the pushover curve for ductile framed buildings. Although monotonic pushover analysis is preferred due to the simple application procedure, this analysis gives rise to overestimated results by neglecting the cumulative damage effects. In the present study, the acceptabilities of monotonic and cyclic pushover analysis results for the near-collapse performance limit state are determined by comparing with Incremental Dynamic Analysis (IDA) results for a 5-story Reinforced Concrete framed building. IDA is performed to obtain the collapse point, and the near-collapse drift ratios for monotonic and cyclic pushover analysis methods are obtained separately. These two alternative drift ratios are compared with the collapse drift ratio. The correlations of the maximum tensile and compression strain at the base columns and beam plastic rotations with interstory drift ratios are acquired using the nonlinear time history analysis results by the simple linear regression analyses. It is seen that these parameters are highly correlated with the interstory drift ratios, and the results reveal that the near-collapse point acquired by monotonic pushover analysis causes unacceptably high tensile and compression strains at the base columns, as well as large plastic rotations at the beams. However, it is shown that the results of cyclic pushover analysis are acceptable for the near-collapse performance limit state.
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中高层钢筋混凝土框架建筑近倒塌点单调和循环pushover分析的比较
近倒塌性能极限定义为延性框架建筑在推覆曲线下降区最大基底剪力下降20%时的变形。虽然由于应用程序简单,单调推覆分析是首选的,但这种分析由于忽略了累积损伤效应而导致结果高估。通过与某5层钢筋混凝土框架建筑的增量动力分析(IDA)结果进行比较,确定了单调和循环推覆分析结果在接近倒塌性能极限状态下的可接受性。采用IDA法获得了崩塌点,并分别得到了单调和循环推覆分析方法的近崩塌漂移比。将这两种替代漂移比与崩塌漂移比进行了比较。利用非线性时程分析结果,通过简单的线性回归分析,得到了基础柱和梁塑性转动时的最大拉压应变与层间位移比的关系。这些参数与层间位移比高度相关,结果表明,单调推覆分析获得的近崩溃点导致基础柱的拉压应变高得令人无法接受,梁的塑性旋转也很大。然而,对于接近破坏性能极限状态,循环推覆分析的结果是可以接受的。
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来源期刊
Earthquakes and Structures
Earthquakes and Structures ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
2.90
自引率
20.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Earthquakes and Structures, An International Journal, focuses on the effects of earthquakes on civil engineering structures. The journal will serve as a powerful repository of technical information and will provide a highimpact publication platform for the global community of researchers in the traditional, as well as emerging, subdisciplines of the broader earthquake engineering field. Specifically, some of the major topics covered by the Journal include: .. characterization of strong ground motions, .. quantification of earthquake demand and structural capacity, .. design of earthquake resistant structures and foundations, .. experimental and computational methods, .. seismic regulations and building codes, .. seismic hazard assessment, .. seismic risk mitigation, .. site effects and soil-structure interaction, .. assessment, repair and strengthening of existing structures, including historic structures and monuments, and .. emerging technologies including passive control technologies, structural monitoring systems, and cyberinfrastructure tools for seismic data management, experimental applications, early warning and response
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