Bi-directional semi-active tuned mass damper for torsional asymmetric structural seismic response control

Wang, Liangkun; Zhou, Ying; Nagarajaiah, Satish; Shi, Weixing

doi:10.1016/j.engstruct.2023.116744

Cited by 76 publications

(10 citation statements)

References 48 publications

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“…A plastic hose was linked to the metal tube welded in the gutter's front edge to carry runoff water and sediments to a plastic tank located downslope (Figure 5). This passive control strategy, as explained above, has been used for many years; for better results, one could propose semi-active control and adaptive control [50,51].…”

Section: Evaluation Of Erosion Control Practicesmentioning

confidence: 99%

How Effective Are Palm-Fiber-Based Erosion Control Blankets (ECB) against Natural Rainfall?

Jahja,

Mudatstsir,

Supu

et al. 2024

Sustainability

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Rainfall-induced soil erosion is a significant environmental issue that can lead to soil degradation and loss of vegetation. The estimated global annual loss increased by 2.5% over 11 years, from 35 billion tons in 2001 to 35.9 billion tons in 2012, mainly due to spatial changes. Indonesia is predicted to be among the largest and most intensively eroded regions among countries with higher soil erosion, regarded as hot-spots higher than 20 Mg yr−1 ha−1. Due to climate change, natural rainfall patterns in the tropical regions have been subject to change, with a lower number of rainy days and increased intensity of precipitation. Such changes trigger more soil erosion due to heavier rainfall kicking up dried soil particles that are exposed in the bare embankments. Unfortunately, there is no prevention available in developing countries due to the lack of availability and high prices of mitigation techniques such as terraces and covering areas with geotextiles or blankets. Erosion control blankets (ECBs) have emerged as a potential solution to mitigate soil erosion. This research article aims to evaluate the effectiveness of sugar-palm-fiber-based ECB in reducing soil erosion caused by natural rainfall. The study investigates the effectiveness of sugar-palm-based ECB in protecting against erosion at the designated embankment. During the three months of typical rainy seasons (February to April 2023), total eroded mass (kg) was collected and measured from two adjacent microplots (10 m2 each), one covered with ECB and the other one left as uncovered soil (bare soil). The results indicate that eroded mass is proportional to rainfall, with coefficients of 0.4 and 0.04 for bare soil and ECB-covered embankments, respectively. The total soil loss recorded during the monitoring period was 154.6 kg and 16.7 kg for bare and ECB-covered soil, respectively. The significantly high efficiency of the up to 90% reduction in soil losses was achieved by covering the slope with sugar-palm-fiber-based ECB. The reason for this may be attributed to the intrinsic surface properties of sugar palm fiber ropes and the soil characteristics of the plot area. Sugar palm (Arenga pinnata) fiber has higher lignocellulosic contents that produce a perfect combination of strong mechanical properties (higher tensile strength and young modulus) and a higher resistance to weathering processes. Although the cost of production of handmade sugar-palm-fiber-based ECB is now as high as 4 EUR, further reductions in cost production can be achieved by introducing machinery. Compared to typical ECBs which have smaller openings, sugar-palm-based ECB has larger openings that allow for vegetation to grow and provide it with a lower density. As such, we recommend improvements in the quality of palm-fiber-based ECB via the introduction of further automation in the production process, so that the price can be reduced in line with other commercially available natural fibers such as jute and coir.

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Section: Evaluation Of Erosion Control Practicesmentioning

confidence: 99%

How Effective Are Palm-Fiber-Based Erosion Control Blankets (ECB) against Natural Rainfall?

Jahja,

Mudatstsir,

Supu

et al. 2024

Sustainability

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“…A growing demand for light and slender structures, caused by a limited area of urban agglomerations, makes modern buildings more susceptible to dynamic loads [16] [26]. It is a direct reason for an increased interest in the subject of vibrations affecting buildings and, thus, publications on vibration damping using tuned mass dampers [10] [11]. Vibration absorbers are devices that dampen the vibrations of a main oscillator.…”

Section: Introductionmentioning

confidence: 99%

Proposition of a structural health monitoring model for a concept of an innovative variable mass pendular tuned mass damper

Radomski,

Sierociński,

Chiliński

2024

Diagnostyka

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The article focuses on the proposal of a model of a skyscraper equipped with a semi-active pendular vibration eliminator utilizing the phenomenon of fluid transfer, which could be used in monitoring the condition of slender structures. The proposed model consists of two main elements: an upper member, representing the dynamic mass of a skyscraper in the form of a trolley, and a lower member -a pendulum attached to the trolley. To consider the fluid transfer, a variable mass factor represented by an inverse tangent function was included in the equation of motion. Simulation studies in a dimensionless time domain were performed to investigate the influence of mass distribution on changes in the system's response. Three dynamic states of the system were considered, during which the system's total mass remained constant. Diagnostic parameters enabling the detection of changes in the mass of the eliminator and stiffness of a damped structure have been proposed.

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“…Since earthquakes can seriously disrupt the sustainable development of cities, prioritizing earthquake preparedness is essential to ensuring the sustainable development of the economy and society. Improving the seismic resilience of buildings [8] can directly decrease damage caused by earthquakes. Additionally, disaster mitigation planning, including risk assessment, disaster prevention, and humanitarian responses, leading to sustainability actions [9], is critical for protecting the gains of development [10].…”

Section: Introductionmentioning

confidence: 99%

“…max f 3 = ∑ d∈D,t∈T v dt∏ l∈L dt p l + ∑ d∈D,e∈E v de∏ l∈L de p l + ∑ t∈T,e∈E v te∏ l∈L te p l , (8) • Constraints.…”

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Multi-Objective Evcuation Planning Model Considering Post-Earthquake Fire Spread: A Tokyo Case Study

Tang,

Osaragi

2024

Sustainability

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As an integral part of the 2030 Agenda for Sustainable Development, Disaster Risk Reduction (DRR) is essential for human safety and city sustainability. In recent years, natural disasters, which have had a tremendous negative impact on economic and social development, have frequently occurred in cities. As one of these devastating disasters, earthquakes can severely damage the achievements of urban development and impact the sustainable development of cities. To prepare for potential large earthquakes in the future, efficient evacuation plans need to be developed to enhance evacuation efficiency and minimize casualties. Most previous research focuses on minimization of distance or cost while ignoring risk factors. We propose a multi-objective optimization model with the goal of reducing the risk during the evacuation process, which is called the risk reduction model (RRM). Problem-specific indicators for screening optimal solutions are introduced. The research selects the Ogu area in Tokyo as a case study, where there is a relatively high density of wooden structures, increasing the risks of building collapse and fire spread after an earthquake, and is based on a two-phase evacuation flow that considers secondary evacuation for fire response. The results indicate that, in this case, RRM can, in most situations, reduce the risk level during the evacuation process and improve evacuation efficiency and success rate without significantly increasing the total evacuation distance. It proves to be superior to the traditional distance minimization model (DMM), which prioritizes minimizing the total distance as the objective function.

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Bi-directional semi-active tuned mass damper for torsional asymmetric structural seismic response control

Cited by 76 publications

References 48 publications

How Effective Are Palm-Fiber-Based Erosion Control Blankets (ECB) against Natural Rainfall?

How Effective Are Palm-Fiber-Based Erosion Control Blankets (ECB) against Natural Rainfall?

Proposition of a structural health monitoring model for a concept of an innovative variable mass pendular tuned mass damper

Multi-Objective Evcuation Planning Model Considering Post-Earthquake Fire Spread: A Tokyo Case Study

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