The Effect of Strong Column-Weak Beam Ratio on the Collapse Behaviour of Reinforced Concrete Moment Frames Subjected to Near-Field Earthquakes

Ghorbanzadeh, Mohammad; Khoshnoudian, Faramarz

doi:10.1080/13632469.2020.1822228

Cited by 9 publications

(6 citation statements)

References 24 publications

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“…Although these ratios are well-established in the building code, researchers still have a strong interest in exploring the effect of different SCWB ratios on the seismic behavior of building structures. [43,47] This study focuses on CF structures with square CFST columns, I-shaped steel beams, and RC slabs. Therefore, building codes related to seismic design for steel structures may be most suitable for analyzing such prototype buildings.…”

Section: Member Capacity Checksmentioning

confidence: 99%

Life‐cycle cost‐oriented multiobjective optimization of composite frames considering the slab effect

Lin

Zhang

2023

Structural Design Tall Build

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Summary The life‐cycle cost‐oriented design philosophy is a promising tool for building resilient cities as it helps in gaining insights into the impact of hazard‐induced damage and repair of civil and infrastructure systems. In this study, a socioeconomic parameter‐independent practical formulation was introduced for life‐cycle cost analysis by combining the economic loss rate associated with different damage limit states and cloud analysis‐based probabilistic seismic demand model. A framework for life‐cycle cost analysis‐based seismic design optimization was proposed using an emerging nature‐inspired algorithm, namely, the multiobjective cuckoo search. By considering an eight‐story prototype composite frame, the framework was used to determine the trade‐off design alternatives between competing optimization objectives. Conventional and improved fiber models were developed to comparatively evaluate the influence of the slab spatial composite effect on Pareto optimal designs. The key drivers of change in three cost indicators were identified using generalized linear models. The result indicates that the overstrength factor is the critical design parameter affecting the initial construction, seismic damage, and life‐cycle costs, with statistical significance at the 0.001 level.

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Section: Member Capacity Checksmentioning

confidence: 99%

Life‐cycle cost‐oriented multiobjective optimization of composite frames considering the slab effect

Lin

Zhang

2023

Structural Design Tall Build

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“…The hysteretic behavior of rotational springs was based on the modified Ibarra-Medina-Krawinkler deterioration model (Lignos and Krawinkler 2013). Further information about the numerical modeling can be found in Ghorbanzadeh and Khoshnoudian (2020). It should be noted that infill walls were not modeled in this study.…”

Section: Structural Modelingmentioning

confidence: 99%

“…With the increase of the SCWBR, a local collapse mechanism may be converted to an ideal collapse mechanism. Ghorbanzadeh and Khoshnoudian (2020) concluded that this type of improvement depends on the ground motion characteristics such as pulse period and peak ground velocity (PGV). They demonstrated that the increase of the SCWBR may only postpone the occurrence of a local collapse mechanism.…”

Section: Introductionmentioning

confidence: 99%

A probabilistic model for the evaluation of strong column-weak beam provision for flexible-base buildings subjected to pulse-like ground motions

Ghorbanzadeh

Khoshnoudian

Taghikhany

2021

Bull Earthquake Eng

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The main objective of this study is to employ a probabilistic approach to determine the appropriate value of the strong column-weak beam ratio (SCWBR) for three mid-to highrise moment frames. These buildings are subjected to pulse-type ground motions. The nonlinear soil-structure interaction (SSI) is also involved as another seismic energy dissipation mechanism. A set of incremental nonlinear dynamic analyses are performed for 91 pulselike ground motions. The proposed approach includes global and local performance criteria. Park-Ang damage index is utilized as the damage measure for columns. In this regard, simple mathematical equations are also derived to quantify the impact of the SCWBR. This framework introduces an upper bound on the SCWBR beyond which further increase of this parameter would not be required to limit the damage of columns. The results indicate that for the 4-story building, the applicability of the SCWBR extends to values as large as 2.4, while for the 8 and 12-story buildings, this is restricted to 1.8 and 1.6, respectively. However, these values substantially depend on the pulse period in such a way that the SCWBR of 1.2 would be sufficient when the pulse period is approaching the fundamental period of structures. The SSI may improve the collapse probability of high-rise structures to a larger extent compared to SCWBR. Nevertheless, its effect can be diminished by more damage of columns at the lower portion of buildings.

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“…RC frames designed before modern seismic codes sometimes collapse in SBWC failure mode, shear failure mode, soft story failure mode, and other nonductile failure modes [29][30][31]. Some research has been conducted to guarantee the SCWB failure mode by increasing the value FSRCB for steel frames [17,19,20,32] and RC frames [18,21,28,[33][34][35][36][37][38][39][40]. Based on the findings above, different FSRCB values ranging from 1.6 to 3.0 have been suggested to ensure the SCWB failure mode [21,28,32,[36][37][38].…”

Section: Introductionmentioning

confidence: 99%

“…Some research has been conducted to guarantee the SCWB failure mode by increasing the value FSRCB for steel frames [17,19,20,32] and RC frames [18,21,28,[33][34][35][36][37][38][39][40]. Based on the findings above, different FSRCB values ranging from 1.6 to 3.0 have been suggested to ensure the SCWB failure mode [21,28,32,[36][37][38].…”

Section: Introductionmentioning

confidence: 99%

The Influence of the Flexural Strength Ratio of Columns to Beams on the Collapse Capacity of RC Frame Structures

et al. 2022

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Reinforced concrete (RC) frames are designed based on the strong column-weak beam (SCWB) philosophy to reduce structural damage and collapse during earthquakes. The SCWB design philosophy is ensured by the required minimum flexural strength ratio of columns to beams (FSRCB) in the seismic code. Quantifying the relationship between the FSRCB and the collapse capacity of the frames may facilitate the efficient assessment of the seismic performance of the existing or newly designed RC frames. This paper investigates the influence of different FSRCBs on the collapse capacity of three- and nine-story RC frames designed according to Chinese seismic codes. The results show that the collapse capacities of the RC frames can be efficiently improved by increasing the FSRCB, and the collapse capacities of frames with FSRCB = 2.0 are improved by approximately 1.6–2.0 times compared with those of the frames with FSRCB = 1.2. Compared with the middle- or high-rise (nine-story) frames, it is more efficient to improve the collapse capacity for low-rise (three-story) frames by increasing the value of CBFSR. The logarithmic standard deviation of the collapse capacity of the RC frames designed according to the Chinese seismic codes ranges from 0.5–0.9, which is larger than the proposed maximum logarithmic standard deviation (0.4) in FEMA P695.

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The Effect of Strong Column-Weak Beam Ratio on the Collapse Behaviour of Reinforced Concrete Moment Frames Subjected to Near-Field Earthquakes

Cited by 9 publications

References 24 publications

Life‐cycle cost‐oriented multiobjective optimization of composite frames considering the slab effect

Life‐cycle cost‐oriented multiobjective optimization of composite frames considering the slab effect

A probabilistic model for the evaluation of strong column-weak beam provision for flexible-base buildings subjected to pulse-like ground motions

The Influence of the Flexural Strength Ratio of Columns to Beams on the Collapse Capacity of RC Frame Structures

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