Using Metallic Dampers to Improve Seismic Performance of Soft-Story RC Frames: Experimental and Numerical Study

Oinam, Romanbabu M.; Sahoo, Dipti Ranjan

doi:10.1061/(asce)cf.1943-5509.0001254

Cited by 21 publications

(4 citation statements)

References 37 publications

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“…For displacement-related analysis, transducers such as linear variable differential transducers (LVDTs) may be used to assess elongation as tensile loads are applied to the specimen [27], as well as axial deformation [28] and lateral displacement. Meanwhile, strain analysis is achieved by using strain gauges for monitoring [29] and measuring direct strain [30] and axial forces [28]. The evaluation of the seismic performance of dampers and structures may also be performed with the aid of accelerometers to measure horizontal accelerations and derive optimum yield-shear force coefficients [28].…”

Section: Experimental Evaluation Process Of Msdsmentioning

confidence: 99%

Evaluation of the Seismic Performance of Single-Plate Metallic Slit Dampers Using Experimental and Numerical Data

Payawal,

Kim

2023

Buildings

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Passive energy dissipation systems and devices are helpful in mitigating the danger of earthquake damage to structures. Metallic slit dampers (MSDs) are one of the most efficient and cost-effective solutions for decreasing seismic energy intake. The potential importance of MSDs in managing vibrations and limiting structural fatigue continues to grow as research advances and new materials and designs are introduced. This study evaluated the seismic performance of single-plate MSDs (SPMSDs) through a combination of numerical simulation and assessment of experimental results. ABAQUS software was used to create an assembly consisting of endplates, bolts, and SPMSDs. A real-world earthquake scenario was simulated using cyclic loads based on ASCE/SEI standards, and displacement-measuring devices such as strain gauges and LVDT were employed to record the behavior of the SPMSDs. The results of the experiment are used to assess the compliance of the SPMSDs and discuss their behavior as they undergo minimum and maximum displacements due to minimum and maximum applied forces. The energy dissipation capabilities of the dampers are presented by analyzing and comparing the area of their hysteresis loops, equivalent viscous damping, and their damping ratios. Actual failure modes are identified and shown to describe the limitations and potential vulnerability of the dampers. The relative error between the lowest and greatest recorded forces from experimental data and numerical simulation ranges from 4.4% to 5.7% for SPMSD 1 and from 1.6% to 2.1% for SPMSD 2, respectively. These deviation values represent a satisfactory level of precision, demonstrating that the numerical simulation accurately predicts the actual performance and behavior of the dampers when subjected to cyclic stress. The topology optimization performed in this study yielded an improved geometry of the SPMSD suited for a corresponding maximum considered earthquake (MCER) displacement of ±33 mm. This research also suggests practical implementations of the investigated and improved SPMSDs.

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Section: Experimental Evaluation Process Of Msdsmentioning

confidence: 99%

Evaluation of the Seismic Performance of Single-Plate Metallic Slit Dampers Using Experimental and Numerical Data

Payawal,

Kim

2023

Buildings

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“…Buildings with soft storey irregularity should be detected and strengthened against the earthquake immediately. There are many strengthening methods in the literature to prevent soft storey irregularity (Oinam and Sahoo, 2019;Thinley and Hao, 2017;Benavent-Climent and Mota-Paez, 2017;Shin et al, 2016;Sahoo and Rai, 2013). In these strengthening methods, however, the buildings must be completely evacuated.…”

Section: Figurementioning

confidence: 99%

An Analytical Investigation of a Building Having Soft Storey Irregularity Strengthened With Concentrically Steel Braces

Ünal

2020

Konya Journal of Engineering Sciences

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When buildings that were damaged and destroyed in major earthquakes in previous years are examined, it is seen that these buildings have several structural defects. One of these defects is that soft storey irregularity is not predicted in reinforced concrete buildings. For this reason, many buildings collapsed because of the major earthquakes, resulting in loss of life and property. Buildings stocks in earthquake zones must be inspected and buildings with the soft storey irregularity must be strengthened immediately. Also, strengthening methods are required to be quick and effective, and aesthetics of structures should not be disturbed. In this study, a 10-storey building with the soft storey irregularity is discussed. The building is strengthened with five different types of Steel Braces in various earthquake regulations in the world. The strengthening was conducted with a nonlinear analysis program and results were evaluated. According to the results, it was found that the Concentrically Steel Braces significantly increased the stiffness of the reinforced concrete building and eliminated the soft storey irregularity.

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“…For example, the axial force was released by inserting a steel pin shaft between two triangular steel plates (Khoshkalam et al, 2021). Shear steel plate was combined the X-shaped steel plate to increase strength and stiffness, which was experimentally validated (Oinam and Sahoo, 2018). However, it is worth noting that the boundary ends of the steel plates are often fixed by welding technology, which tend to generate negative impact to the hysteretic behavior of the damper.…”

Section: Introductionmentioning

confidence: 99%

Cyclic loading tests and numerical simulations of an assembled X-shaped flexural steel damper

Qiu,

Huang,

Liu

2023

Advances in Structural Engineering

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This paper proposes an assembled X-shaped flexural steel damper. Welding is waived for the novel damper. As the kernel element of the damper, the X-shaped flexural steel plates have the advantages of ease of installation and replacement if necessary. In the analytical part, the effective height of the flexural steel plate was suggested, and then, the yield displacement, yield load and initial stiffness of the damper were derived. The proof-of-concept cyclic loading test was conducted using one reduced-scale specimen within a four-bar linkage experimental setup. The hysteretic performance indexes, including strength, stiffness and energy dissipation, were quantified. The high-fidelity finite element (FE) models were established by ABAQUS. The parametric study was further conducted based on the verified FE model. The considered parameters were the height and thickness of the steel plates. The testing results indicate that the proposed damper has plump hysteretic curve with good energy dissipation capacity and excellent ductility, although slight slip behavior can be found due to the gap caused by the assembling process. The results obtained from analytical method and numerical model are in good agreement with the experimental data. The results of parametric analysis show that the numerical results well agree with analytical predictions, indicating the numerical model can reflect the mechanical behavior of AXSFD. A benchmark frame building was selected to demonstrate the seismic control efficacy of the damper. The nonlinear time history analysis results indicate that the damper reduced both peak and residual interstory drift ratios for the protected structure.

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Using Metallic Dampers to Improve Seismic Performance of Soft-Story RC Frames: Experimental and Numerical Study

Cited by 21 publications

References 37 publications

Evaluation of the Seismic Performance of Single-Plate Metallic Slit Dampers Using Experimental and Numerical Data

Evaluation of the Seismic Performance of Single-Plate Metallic Slit Dampers Using Experimental and Numerical Data

An Analytical Investigation of a Building Having Soft Storey Irregularity Strengthened With Concentrically Steel Braces

Cyclic loading tests and numerical simulations of an assembled X-shaped flexural steel damper

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