scholarly journals EXPERIMENTAL BEHAVIOUR OF A LOW-COST SEISMIC ENERGY DISSIPATION DEVICE

2020 ◽  
pp. 65-81
Author(s):  
Héctor Guerrero Bobadilla ◽  
Emmanuel Zamora Romero ◽  
Jose Alberto Escobar Sánchez ◽  
Roberto Gómez Martínez
Keyword(s):  
Energy Dissipation ◽  
Low Cost ◽  
Structural Response ◽  
Seismic Energy ◽  
Experimental Tests ◽  
Hysteretic Behavior ◽  
Dissipated Energy ◽  
High Tech ◽  
Seismic Safety ◽  
Existing Structures

Safety during earthquakes should be a human right and shall be accessible not only to those who can pay for proprietary high-tech devices but to everyone. Based on that, this study has been developed with the intention of helping to improve the seismic safety in the developing world. Within this paper, a low-cost, low-tech seismic energy dissipation device is proposed. Its experimental behavior under seismic loading is assessed. The device type is buckling-restrained brace (BRB) and, according to its characteristics, it is suitable for new and existing, medium- to low-rise structures. First, the device characteristics and fabrication process are presented. Then, its structural response, in terms of the hysteretic behavior, ductility, and dissipated energy – as obtained from experimental tests – is shown. Experimental results show an excellent behavior of the proposed device. As a result, it can be said that the device is reliable and its use is recommended for new, and retrofitting/upgrading existing, structures. Design recommendations are also provided.

Evaluation of a low-cost seismic energy dissipation device for buildings

2021 ◽  
Author(s):  
Héctor Guerrero ◽  
Roberto Gomez ◽  
J. Alberto Escobar
Keyword(s):  
Energy Dissipation ◽  
Low Cost ◽  
Structural Response ◽  
Seismic Energy ◽  
Seismic Loading ◽  
Experimental Tests ◽  
Dissipated Energy ◽  
High Tech ◽  
Human Right ◽  
Existing Structures

<p>Safety during earthquakes should be a human right and shall be accessible not only to those who can pay for proprietary high-tech devices but to everyone. Based on that, this paper presents a low- cost, low-tech seismic energy dissipation device. Its experimental behaviour under seismic loading is assessed. The device is classified as buckling-restrained brace (BRB) and, according to its characteristics, it is suitable for new and existing, medium- to low-rise structures. First, the device composing parts are presented. Then, its structural response, in terms of hysteretic behaviour, ductility, and dissipated energy – as obtained from experimental tests – is shown. Experimental results show an excellent behaviour. As a result, it can be said that the device is reliable and its use is recommended for new and existing structures. Design recommendations are also provided.</p>

Multistable Cosine-Curved Dome System for Elastic Energy Dissipation

2019 ◽  
Vol 86 (9) ◽  
Author(s):  
Mansour Alturki ◽  
Rigoberto Burgueño
Keyword(s):  
Energy Dissipation ◽  
Analytical Model ◽  
Nonlinear Behavior ◽  
Experimental Tests ◽  
High Energy ◽  
Bistable System ◽  
Dissipated Energy ◽  
Element Analysis ◽  
The Individual ◽  
Hysteretic Response

This paper presents a new energy dissipation system composed of multistable cosine-curved domes (CCD) connected in series. The system exhibits multiple consecutive snap-through and snap-back buckling behavior with a hysteretic response. The response of the CCDs is within the elastic regime and hence the system's original configuration is fully recoverable. Numerical studies and experimental tests were conducted on the geometric properties of the individual CCD units and their number in the system to examine the force–displacement and energy dissipation characteristics. Finite element analysis (FEA) was performed to simulate the response of the system to develop a multilinear analytical model for the hysteretic response that considers the nonlinear behavior of the system. The model was used to study the energy dissipation characteristics of the system. Experimental tests on 3D printed specimens were conducted to analyze the system and validate numerical results. Results show that the energy dissipation mainly depends on the number and the apex height-to-thickness ratio of the CCD units. The developed multilinear analytical model yields conservative yet accurate values for the dissipated energy of the system. The proposed system offered reliable high energy dissipation with a maximum loss factor value of 0.14 for a monostable (self-recoverable) system and higher for a bistable system.

Comparative dynamic investigation of cross-laminated wooden panel systems: Shaking-table tests and analysis

2017 ◽  
Vol 21 (10) ◽  
pp. 1421-1436 ◽  
Author(s):  
Viktor Hristovski ◽  
Violeta Mircevska ◽  
Bruno Dujic ◽  
Mihail Garevski
Keyword(s):  
Energy Dissipation ◽  
Earthquake Engineering ◽  
Dynamic Properties ◽  
Seismic Energy ◽  
Experimental Tests ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Equivalent Viscous Damping ◽  
Cross Laminated Timber ◽  
Engineering Seismology

Cross-laminated timber has recently gained great popularity in earthquake-prone areas for construction of residential, administrative, and other types of buildings. At the Laboratory of the Institute of Earthquake Engineering and Engineering Seismology in Skopje, comparative full-scale shaking-table tests of cross-laminated timber panel systems have been carried out as a part of the full research program on the seismic behavior of these types of wooden systems, realized by Institute of Earthquake Engineering and Engineering Seismology, Skopje, and the Faculty of Civil and Geodetic Engineering (UL FCG), University of Ljubljana. Two different specimens built of cross-laminated timber panels have been tested: specimen containing a pair of single-unit principal wall elements (Specimen 1) and specimen containing a pair of two-unit principal wall elements (Specimen 2). In this article, the results from the shaking-table tests obtained for Specimen 2 and numerically verified by using appropriate finite element method–based computational model are discussed. Reference is also made to the comparative analysis of the test results obtained for both specimens. One of the most important aspects of the research has been the estimation of the seismic energy-dissipation ability of Specimen 1 and 2, via calculation of the equivalent viscous damping using the performed experimental tests. It is generally concluded that Specimen 2 exhibits a similar rocking behavior as Specimen 1, with similar energy-dissipation ability. Both specimens have manifested slightly different dynamic properties, mostly because Specimen 2 has been designed with one anchor more compared to Specimen 1. Forced vibration tests have been used for identification of the effective stiffness on the contacts for Specimen 2. This research is expected to be a contribution toward clarification of the behavior and practical design of cross-laminated timber panel systems subjected to earthquake loading.

Effect of Width-to-Thickness Ratio on Large Deformation in Shear Panel Hysteresis Damper Using Low Yield Point Steel

2013 ◽  
Vol 446-447 ◽  
pp. 1460-1465 ◽  
Author(s):  
Daniel Y. Abebe ◽  
Jae Hyouk Choi ◽  
Si Jeong Jeong
Keyword(s):  
Energy Dissipation ◽  
Large Deformation ◽  
Yield Point ◽  
Seismic Energy ◽  
Thickness Ratio ◽  
Hysteretic Behavior ◽  
Engineering Structures ◽  
Element Analysis ◽  
Energy Dissipating Device ◽  
Shear Panel

Recently, building and other civil engineering structures are built with energy dissipating device in order to reduce the damages caused by earthquake. There are a number of seismic energy dissipating device and steel dampers are among many energy dissipation device which is widely used because they are easy for construction, maintenance and low cost. Shear panel damper (SPD) is a type steel damper that dissipates energy by metallic deformation or using hysteresis of material as a source of energy dissipation. Low yield point steel is a good material to be used as a hysteresis damper since it has excellent ductility performance. Nonlinear finite element analysis was carried out to predict the large deformation and hysteretic behavior of SPD using low yield point steel (SLY120) for different width-to-thickness ratio. In order to verify the analysis simulation, quasi-static loading was also conducted and from the comparison a satisfactory result was found.

scholarly journals Experimental Campaign of a Low-Cost and Replaceable System for Passive Energy Dissipation in Precast Concrete Structures

2020 ◽  
Vol 10 (4) ◽  
pp. 1213 ◽  
Author(s):  
Álvaro Mena ◽  
Jorge Franco ◽  
Daniel Miguel ◽  
Jesús Mínguez ◽  
Ana Carla Jiménez ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Structural Damage ◽  
Low Cost ◽  
Precast Concrete ◽  
Seismic Energy ◽  
Structural Wall ◽  
Residential Structures ◽  
Energy Dissipation System ◽  
Seismic Tests ◽  
Dissipation System

This research develops a new low-cost energy dissipation system, capable of being implemented in residential structures in developing countries with high seismic activity, in which the current solutions are not economically viable. These residential structures are entirely made of precast concrete elements (foundations, walls, and slabs). A solution is developed that consists of a new connection between a precast foundation and a structural wall, which is capable of dissipating almost all the seismic energy, and therfore protecting the rest of the building from structural damage. To validate the solution, a testing campaign is carried out, including a first set of “pushover” tests on isolated structural walls, a second set of “pushover” tests on structural frames, and a final set of seismic tests on a real-scale three-storey building. For the first and second set of tests, ductility is analyzed in accordance with ACI 374.2R-13, while for the third one, the dynamic response to a reference earthquake is evaluated. The results reveal that the solution developed shows great ductility and no relevant damage is observed in the rest of the building, except in the low-cost energy dissipation system. Once an earthquake has finished, a precast building implemented with this low-cost energy dissipation system is capable of showing a structural performance level of “immediate occupancy” according to ACI 374.2R-13.

Optimum Design of a New Hysteretic Dissipater

2013 ◽  
pp. 274-299
Author(s):  
Dora Foti ◽  
Riccardo Nobile
Keyword(s):  
Energy Dissipation ◽  
High Capacity ◽  
Hysteresis Loops ◽  
Seismic Energy ◽  
Dissipated Energy ◽  
Seismic Action ◽  
Finite Element Software ◽  
Out Of Plane ◽  
Optimization Routine ◽  
Structural Parts

In this chapter, a new seismic protection device is proposed. It is designed to dissipate the energy entering a structure subject to seismic action through the activation of hysteresis loops of the material that composes it. These devices are characterized by a high capacity to absorb the seismic energy and the ability to concentrate the damage on it and, consequently, to keep the structure and the structural parts undamaged. Moreover, after a seismic event they can be easily replaced. In particular, this chapter proposes a new shear device that shows the plasticity of some areas of the device at low load levels. In order to maximize the amount of dissipated energy, the design of the device was performed by requiring that the material be stressed in an almost uniform way. In particular, the device is designed to concentrate energy dissipation for plasticity in the aluminum core while the steel parts are responsible to make stiffer the device, limiting out-of-plane instability phenomena. The geometric configuration that maximizes the energy dissipation has been determined using a structural optimization routine of finite element software.

Development and Performance Evaluation of a Novel Translational Tuned Mass Damper

2019 ◽  
Vol 45 ◽  
pp. 53-73 ◽  
Author(s):  
Mohammad Shamim Miah ◽  
Md. Jihad Miah ◽  
Md. Ashik Hossain
Keyword(s):  
Low Cost ◽  
Engineering Application ◽  
Experimental Tests ◽  
Tuned Mass Damper ◽  
Design Criterion ◽  
Existing Structures ◽  
Mass Damper ◽  
And Performance ◽  
Modal Mass ◽  
Two Degree Of Freedom

The structures are prone to dynamic loads such as earthquake as they often generate uncomfortable movement into existing structures. In order to reduce extreme vibration generated by dynamic or operational loads passive, active or hybrid controlling devices are used. And the advantages of passive systems are well accepted due to their inexpensiveness and simplicity. This study investigates the performance of a newly developed uniaxial tuned mass damper (TMD). The novelty of the developed device is that the properties of the damper are adjustable based on the structural requirements. And most importantly, another key design criterion is to make a low-cost affordable device. To do this end, a toy two degree of freedom (2-DOF) system is considered and the experiments are conducted. The experimental tests and numerical simulations are carried out on the structure without and with TMD along with extra masses of 25 kg, 30 kg and 35 kg on the floors to observe the effect of floor mass changes. The scaled El Centro 1940 earthquake data is used as input excitation. In order to determine the optimal performance of the damper, it is tuned to modal mass of 0% (i.e., without TMD), 5%, 7.5%, 10%, 12.5%, and 17.5%. The experimental results have shown that the structure without TMD has pronounced vibration (i.e., displacement) as compared to the structure with TMD. As the percentage of modal mass increases, the vibration of the structure decreases. It is observed that up to 12.5% of modal mass for both 20 and 25 sec excitation duration could be the optimum amount that minimizes the vibration of the structure. The overall performance of this device is capable of reducing vibration in a reasonable manner and has the possibility to use it for the real engineering application.

Application of RCW Base Dissipator on a Set of Masonry Buildings

2014 ◽  
Vol 875-877 ◽  
pp. 763-767
Author(s):  
Mauro Sassu ◽  
Marco Andreini ◽  
Anna de Falco
Keyword(s):  
Mechanical Properties ◽  
Energy Dissipation ◽  
Low Cost ◽  
Hysteretic Behavior ◽  
Numerical Analyses ◽  
Masonry Buildings ◽  
Housing Estate ◽  
Time Histories ◽  
Council Housing

An application of the RCW –Reinforced Cut Wall- on a set of four masonry buildings for council housing estate with a total of 43 lofts is presented. The performances of this low-cost base energy dissipation technique has been evaluated with some experimental on-site tests performed on a couple of specimen (40x60x30 cm) subjected to a series of cyclic quasi-static time histories with increasing intensity. Trials show the high properties of self-centering and of wide hysteretic behavior of the RCW. Numerical analyses confirm the mechanical properties and provide parameters to the evaluation of cyclic dissipation properties.

Experimental Tests of Longitudinal Added Damping and Stiffness Device

2005 ◽  
Author(s):  
C. S. Tsai ◽  
Guan-Hsing Lee ◽  
Wen-Shin Chen ◽  
Li-Te Hsu
Keyword(s):  
Seismic Response ◽  
Passive Control ◽  
Seismic Energy ◽  
Experimental Tests ◽  
Shaking Table ◽  
Hysteretic Behavior ◽  
New Device ◽  
Component Test ◽  
Incremental Form ◽  
Energy Absorbing

Structural passive control technology has been developed rapidly over the past decade, and proven as a feasible and promising way in mitigating the seismic response of a structure. In numerous passive control devices, the added damping and stiffness (ADAS) has been verified as an effective and economical energy-absorbing device to dissipate the seismic energy. Successful applications have also been achieved in Taiwan. A new device named as the longitudinal added damping and stiffness (LADAS) has been developed in this study. The component test shows that the LADAS device can sustain an extremely large number of yielding reversals without any sign of stiffness or strength degradation and has stable energy-dissipating capability. The comparison of analytical and experimental results illustrates that the Wen’s model in an incremental form could successfully predict the hysteretic behavior of LADAS device. Moreover, the earthquake proof efficiency of the LADAS was carried out on a scaled-down three steel frame on a shaking table in Feng Chia University, Taichung, Taiwan. The experiment result demonstrates that a structure with LADASs can significantly reduce the seismic response.

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