Seismic performance of irregular RC frames designed according to the DDBD approach

Giannakouras, P.; Zeris, Christos

doi:10.1016/j.engstruct.2018.12.058

Cited by 21 publications

(10 citation statements)

References 22 publications

(31 reference statements)

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“…Among different seismic design procedures, Direct Displacement‐Based Design (DDBD) has attracted the attention of many researchers in the recent years 18–26 . Priestley et al 10 firstly take the higher mode effect into account for direct displacement‐based design of shear walls.…”

Section: Introductionmentioning

confidence: 99%

“…Among different seismic design procedures, Direct Displacement-Based Design (DDBD) has attracted the attention of many researchers in the recent years. [18][19][20][21][22][23][24][25][26] Priestley et al 10 firstly take the higher mode effect into account for direct displacement-based design of shear walls. They proposed shear force and bending moment envelopes for capacity design of shear walls in DDBD procedure.…”

Section: Introductionmentioning

confidence: 99%

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Seismic force demand on RC shear walls for direct displacement‐based design

Abdi

Khosravi

Jafarieh

2022

Structural Concrete

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This article aims to investigate seismic force demand on RC shear walls which are designed using direct displacement-based design (DDBD) method. For this purpose, first 12 shear walls were designed using DDBD approach and then were modeled nonlinearly in OpenSees using fiber section elements. Each wall was subjected to 45 artificial ground motions and the seismic force demand, including the shear force and the bending moment, were determined along the wall height. The nonlinear dynamic analysis results indicated that the seismic force demand was significantly amplified relative to the design forces. This amplification, which was due to the higher mode effects, is mainly a function of structural period and ductility demand. To find new shear and moment envelopes for capacity design, two envelop shapes compatible with internal force pattern along the wall height were selected. Then, the required equations were presented for envelope parameters based on the regression analysis of the results. The comparison of seismic force demand with proposed and previous envelopes indicates the superiority of new proposed envelopes for DDBD approach.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Seismic force demand on RC shear walls for direct displacement‐based design

Abdi

Khosravi

Jafarieh

2022

Structural Concrete

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“…Studies on asymmetric buildings were mainly focused on seismic performance [23][24][25][26][27], modal identification [28,29], and the effect of torsional coupling during an earthquake [30].…”

Section: Introductionmentioning

confidence: 99%

Damage Detection in Different Types of 3D Asymmetric Buildings Using Vibration Characteristics

Wang

Xiang

et al. 2021

Shock and Vibration

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This paper treats the vibration characteristics of three different types of asymmetric buildings and investigates the feasibility of applying an innovative vibration-based multicriteria approach-based damage index (MCA-DI) technique to detect the damage. This technique combines a modified form of the traditional modal strain energy method (MSEM) developed by decomposing the mode shapes into lateral and vertical components together with a modified form of the modal flexibility method to define a new damage indicator. Lastly, the dynamic behavior of three asymmetric building instances, including a 10-storey L-shaped structure, a 10-storey setback structure, and a 6-storey reinforced concrete structure with an unsymmetrical distribution of columns, was studied under five different damage scenarios. The results showed that despite different vibration characteristics of these three asymmetric buildings, the proposed method was able to accurately and effectively locate all damages and eliminate the confusion when more than one index is simultaneously used by using only the first a few modes.

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“…Researchers also performed a comparative study between the pushover analysis and nonlinear time history analysis of the plan irregular buildings [20]. P. Giannakouras, C. Zeris [21] performed the pushover analysis and nonlinear time history analysis with the direct displacement-based seismic design (DDBD) method in the vertically irregular structure to study the performance of the structures. To understand the seismic performance of the irregular structure, the pushover and nonlinear time history analysis help better than linear analysis and it also helps to prevent failure [22], [23].…”

Section: Introductionmentioning

confidence: 99%

Effect of position of steel bracing in L-shape reinforced concrete buildings under lateral loading

Bohara¹,

Ganaie²,

Saha³

2021

Res. Eng. Struct. Mater.

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The level of damage in irregular structures is more compared to regular structures. In this study, L shaped RC buildings are investigated with and without steel bracings in different positions in frames. The response spectrum analysis has been done by using ETABs software. The two cases considered, case I and case II for understanding the effect in inverted V bracing in L shape building. Case II shows the suitable seismic parameters when bracing is used properly. Interstory drift, displacements, base shear, fundamental time period, torsional irregularity ratio and the capacity ratio of the columns are evaluated. It is also noticed that adding the steel bracing decreases the inter-story drift, displacements of the structure effectively. The torsional irregularity ratio of each 12 models are studied carefully. The capacity ratio of the selected columns is studied to understand the performance of the columns while using the steel bracing in the buildings. The steel bracings are effectively used as retrofitting in L shaped buildings if the position of bracings are considered in the frames appropriately. While designing irregular buildings with steel bracings, the torsional effect should be checked.

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Seismic performance of irregular RC frames designed according to the DDBD approach

Cited by 21 publications

References 22 publications

Seismic force demand on RC shear walls for direct displacement‐based design

Seismic force demand on RC shear walls for direct displacement‐based design

Damage Detection in Different Types of 3D Asymmetric Buildings Using Vibration Characteristics

Effect of position of steel bracing in L-shape reinforced concrete buildings under lateral loading

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