[논문]Seismic Retrofit Assessment of Different Bracing Systems

Sudipta Chakraborty; Md. Rajibul Islam; Dookie Kim; Jeong Young Lee

doi:10.5659/aikar.2023.25.1.1

Seismic Retrofit Assessment of Different Bracing Systems 원문보기

Architectural research, v.25 no.1, 2023년, pp.1 - 9

Sudipta Chakraborty (Department of Civil and Environmental Engineering, Crash & Quake Research Center, Smart Natural Space Research Center, Kongju National University) , Md. Rajibul Islam (Department of Civil and Environmental Engineering, Crash & Quake Research Center, Smart Natural Space Research Center, Kongju National University) , Dookie Kim (Department of Civil and Environmental Engineering, Crash & Quake Research Center, Smart Natural Space Research Center, Kongju National University) , Jeong Young Lee (Department of Civil and Environmental Engineering, Crash & Quake Research Center, Smart Natural Space Research Center, Kongju National University)

Abstract ▼ AI-Helper

Structural ageing influences the structural performance in a negative way by reducing the seismic resilience of the structure which makes it a major concern around the world. Retrofitting is considered to be a pragmatic and feasible solution to address this issue. Numerous retrofitting techniques are devised by researchers over the years. The viability of using steel bracings as retrofitting component is evaluated on a G+30 storied building model designed according to ACI318-14 and ASCE 7-16. Four different types of steel bracing arrangements (V, Inverted V/ Chevron, Cross/ X, Diagonal) are assessed in the model developed in commercial nu-merical analysis software while considering both material and geometric nonlinearities. Reducing displacement and cost in the structures indicates that the design is safe and economical. Therefore, the purpose of this article is to find the best bracing system that causes minimum displacement, which indicates maximum lateral stiffness. To evaluate the seismic vulnerability of each system, incremental dynamic analysis was conducted to develop fragility curves, followed by the formation of collapse margin ratio (CMR) as stipulated in FEMA P695 and finally, a cost estimation was made for each system. The outcomes revealed that the effects of ge-ometric nonlinearity tend to evoke hazardous consequences if not considered in the structural design. Probabilistic seismic and economic probes indicated the superior performance of V braced frame system and its competency to be a germane technique for retrofitting.

주제어

표/그림 (18)

그림 Figure 1. Schematic flow diagram of the analysis methodology.
표 Table 1. Parameters used for building models
표 Table 2. Details of building models developed in ETABS
표 Table 3. Details of selected steel bracing
표 Table 4. Details of selected ground motions
그림 Figure 2. Plan view, Floor plan, Elevation of all models and Moment- Rotation relationship of plastic hinges
그림 Figure 3. Spectrally matched ground motions
그림 Figure 4. Story displacement of all models.
그림 Figure 5. IDR for all models.
그림 Figure 6. Story shear of all models
그림 Figure 7. Bending moment considering with and without P-Δ effect.
표 Table 5.Table 5. Maximum Shear force values
표 Table 6. Developed maximum moment for the all the cases.
그림 Figure 8. Percentage of increment of displacement and shear from without P-Δ to with P-Δ.
표 Table 7. Overview of performance categories according to Xue et al. (2008)
그림 Figure 9. Fragility curves for all models
그림 Figure 10. Collapse fragility curve of all models.
표 Table 8. Collapse margin ratio for all models

참고문헌 (23)

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원문보기 상세보기
Islam, M. R., Chakraborty, S., & Kim, D. (2022). Effect of Plan Irregularity and Beam Discontinuity on Structural Performances of Buildings under Lateral Loadings. ARCHITECTURAL RESEARCH, 24(2), 53-61. DOI: https://doi.org/10.5659/AIKAR.2022.24.2.53

원문보기 상세보기
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