Seismic mitigation performance of structures with viscous dampers under near-fault pulse-type earthquakes

Hu, Gaoxing; Wang, Yanan; Huang, Wei; Li, Bin; Luo, Bin

doi:10.1016/j.engstruct.2019.109878

Cited by 21 publications

(4 citation statements)

References 19 publications

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“…Ground motions for nonlinear analysis were selected from the Pacific Earthquake Engineering Research Center (PEER) website, where eleven pulse-like records were identified. The pulse-like nature of these ground motions was evaluated using Baker's pulse indicator [13] and Hu et al's peak ground velocity [42]. Figure 4 illustrates an example of the wavelet decomposition process used to identify pulse-like ground motions, while Table 3 provides a summary of the motions' intensity and characteristics.…”

Section: Figure 1 General Descriptive Illustration Of the Research Me...mentioning

confidence: 99%

Seismic Performance of Reinforced Concrete Structures with Concrete Deficiency Caused by In-situ Quality Management Issues

Aljaafreh,

Alzubi,

Al-Kharabsheh

et al. 2023

Civ Eng J

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Concrete is a widely used building material known for its cost-effectiveness and high resistance compared to alternative materials. However, uncertainties in the casting process due to variations in the environment and human error can compromise its strength, increasing the risk of collapse when subjected to seismic excitations. Previous studies have demonstrated the detrimental effects of earthquake vibrations on buildings and infrastructure. This study aims to fill the research gap by investigating the seismic behavior of reinforced concrete (RC) structures constructed with lower-quality concrete under near-fault pulse-like ground motions. The main objective of this research is to assess the impact of diminished concrete strength on structural rigidity and susceptibility to ground disturbances. Specifically, the study aims to quantify the extent of performance changes in defective structures, particularly those constructed with poor-quality concrete, in response to seismic activities. To achieve this, the research involves developing multiple finite element models and conducting nonlinear analysis to scrutinize their behavior. A key focus of the study is to compare the performance of various RC buildings with concrete defects to that of a benchmark model. This comparative analysis highlights the influence of suboptimal quality control on the nonlinear behavior of RC structures. Furthermore, the study examines the correlation between changes in building response and earthquake characteristics to provide comprehensive insights into the potential risks associated with substandard construction practices. Based on the results of this study, it was found that inadequate quality control of concrete significantly impacts the performance of RC frames subjected to pulse-like ground motions. The decrease in compressive strength of the concrete led to noticeable increases in various structural parameters, including story shear, overturning moments, story displacement, drifts, accelerations, and hysteretic energy. These findings highlight the detrimental effects of compromised concrete quality on the overall structural response. Doi: 10.28991/CEJ-2023-09-08-010 Full Text: PDF

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Section: Figure 1 General Descriptive Illustration Of the Research Me...mentioning

confidence: 99%

Seismic Performance of Reinforced Concrete Structures with Concrete Deficiency Caused by In-situ Quality Management Issues

Aljaafreh,

Alzubi,

Al-Kharabsheh

et al. 2023

Civ Eng J

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“…Hence, k b and c d can be replaced by the above equation [23], and the resulting equation is divided by m to obtain the following:…”

Section: Modelling Of Structures With Vds In State-space Representationmentioning

confidence: 99%

Vibration Reduction Performance of Structures with Viscous Dampers under Near‐Field Earthquakes

Lin

2022

Advances in Civil Engineering

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Near-field pulse-type ground motions (NPGMs) are characterized by a high-energy pulse with large peak ground velocities and accelerations and need further studies to confirm whether structures with viscous dampers (VDs) are still applicable and effective for this type of ground motions. In this article, the vibration reduction performance of structures with VDs under near-field earthquakes is investigated systematically. Displacement and acceleration spectra are developed for a single-degree-of-freedom (SDOF) structure with and without VDs, while these influence factors, such as the nonlinear characteristic of structure, damper supports’ flexibility, and damper parameters, are considered. Additionally, the frequency domain characteristics of NPGM and the energy distribution of a multidegree-of-freedom (MDOF) structure with VDs are discussed to further reveal the action mechanism of NPGM on the structure. It is shown that the structure with VDs shows remarkable seismic reduction effect under the action of near-fault pulse-type earthquake, and the maximum interstorey drift decreased from 0.086 to 0.037 when the structure is equipped with VDs. However, the structure may still be difficult to completely dissipate the high-energy generated by the earthquake pulse with a high pulse period in a short time, which can cause the structure to be damaged or even collapsed in a moment.

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“…FVDs also provide additional stiffness to the structure, which is beneficial for the lateral integrity of the structure. Therefore, they are a reliable solution for reducing structural damage during seismic excitations [13]- [15].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Fluid Viscous Damper Design in High-Rise Buildings through Direct Soil Structure Interaction Approach

Hamza,

Hammad,

Khokhar

et al. 2024

Preprint

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The application of fluid viscous dampers (FVDs) in high-rise buildings is increasing rapidly, driven by their effectiveness during seismic excitations. However, conventional design using fixed base or indirect soil structure interaction (SSI) approaches often leads to unrealistic results due to underestimated seismic demands. This study proposes a novel approach for the optimum design of FVDs incorporating direct SSI modeling for high-rise buildings. For this purpose, a 40-story case study building is selected along with the existing underlying soil. A detailed nonlinear finite element model (FEM) was developed for the superstructure and the underlying subgrade using direct SSI approach. For comparative study, two FVDs based models were developed: one designed based on seismic demands from a fixed base model, and the other utilizing the seismic demands from the direct SSI approach. These inelastic computer models were subjected to nonlinear time history analysis, employing three deconvoluted ground motions, to compare their seismic performance. The results show that the design of FVDs considering direct SSI approach can help lower the story drifts and displacements by up to 36% and increase energy dissipation by dampers by up to 10% compared to the conventional approach. The results emphasize the critical significance of adopting direct SSI modeling for achieving the optimal design of FVDs for the resilience of high-rise building structures.

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Seismic mitigation performance of structures with viscous dampers under near-fault pulse-type earthquakes

Cited by 21 publications

References 19 publications

Seismic Performance of Reinforced Concrete Structures with Concrete Deficiency Caused by In-situ Quality Management Issues

Seismic Performance of Reinforced Concrete Structures with Concrete Deficiency Caused by In-situ Quality Management Issues

Vibration Reduction Performance of Structures with Viscous Dampers under Near‐Field Earthquakes

Enhancing Fluid Viscous Damper Design in High-Rise Buildings through Direct Soil Structure Interaction Approach

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