International Symposium on Earthquake Engineering "Enhancement of Building Technologies for Resilient Cities" MODELING, ANALYSIS AND SEISMIC DESIGN OF STRUCTURES USING ENERGY DISSIPATORS SLB (original) (raw)
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Modeling, analysis and seismic design of structures using energy dissipators SLB
TECNIA, 2019
This paper initially describes aspects of the modeling of structures equipped with energy dissipators Shear Link Bozzo (SLB) and develops two iterative design procedures to select these devices. This methodology is applied to a precast 5-story reinforced concrete building. The SLB energy dissipation devices are initially stiff, but ductile with a range of yielding forces from 36 kN to 900 kN characterized by 52 + 52 standard devices. Moreover, these devices can be combined in parallel giving a very wide range of possibilities for selection and corresponding structural response. Therefore, to simplify its automatic selection, this article presents two procedures: (1) direct iteration and (2) inverse or fixed force iteration. Both procedures were implemented in an automatic application or “plugin” for the ETABS program that automates its selection for a specific structural system or architectural configuration of these elements. Using these devices, the energy introduced by an earthqu...
Seismic Behavior of Multi-Storey Structure Using Different Energy Dissipation Devices A-review
Earthquake is a most disaster event, responsible a lot of structural damage and casualties worldwide on the earth's surface without any early warning. The trends in using dampers in buildings and tall buildings, increasing yearly based on their outstanding feature during an earthquake event. Typically, there are four types of energy dissipation device system such as friction damper, viscous damper, viscoelastic damper and metallic damper. The theoretical and experimental study results indicate that all fourth types of dampers can be able to minimize the structural damages and cracking during an earthquake occurrence event. But only viscous damper device has an acceptable feature against of earthquake forces as compare to other kinds of damper devices in symmetric and asymmetric building plan configurations as well. Based on the reviews, a viscous damper device system plays major role in reducing the lateral displacement of buildings about 30% to 85%, inter-storey drift of building about 60% to 80% and 1487.82KN drop in base shear of structural components in symmetric and asymmetric building plan configurations upward as compared to friction dampers, viscoelastic dampers and metallic dampers. Contradictory, dampers can decrease the construction cost limitation of multi-storey structures economically rather than conventional buildings.
Enhancing the Seismic Response of Buildings with Energy Dissipation Methods–An Overview
In recent years many seismic protection systems have been developed to reduce the effects of the devastating wind and seismic loads. For this purpose, greater attention has been directed towards the use of passive energy dissipaters, base isolators, active and hybrid control systems. This paper reviews the existing energy dissipation systems that can be adopted to minimize the amount of damage and response of the structure during extreme dynamic loads. Based on the review, it is observed that passive systems such as tuned mass dampers, friction dampers, tuned liquid dampers are highly effective in moderate seismic zones and wind predominant regions. Base isolation technique decouples the structure from the ground preventing the superstructure from absorbing input energy and it is effective in low to medium rise buildings in hard soil. Seismic isolation systems contribute to safety by withstanding lateral forces also. Active vibration control systems are preferred more than passive control systems when flexibility and height of the buildings is to be considered. This paper highlights the behaviour of various forms of energy dissipation devices during seismic events for real time application in structures.
Performance-Based Seismic Design of Building Structures Using a Passive Energy Dissipation Device
World Conference on Seismic Isolation, Energy Dissipation and Active Vibration Control of Structures Proceedings, 2019
The primary objective of the Performance-Based Seismic Design (PBSD) is to provide stipulated seismic performances for building structures. However, a certain degree of design freedom is needed for matching a specific seismic response. This design freedom is not obtainable by the conventional lateral resisting systems because their stiffness and strength are coupled. Here, we put emphasis on the role of the unconventional lateral resisting systems in adding more flexibility to the design. In this paper, we seek to explore the seismic design of moment resisting frame structures equipped with an innovative hysteretic device, known as Crescent-Shaped Brace (CSB). The paper presents an exhaustive procedure for the seismic design of the CSB devices within the Performance-Based Seismic Design (PBSD) framework. The seismic behavior of an existing three-storey reinforced concrete structure equipped with the CSB devices is studied and verified by means of static pushover and dynamic time-history analyses. The results obtained confirm the validity of the proposed design method and the efficiency of the new hysteretic device. The actual behavior of the controlled structure matches the predefined behavior, thus fulfilling of the prescribed multi-seismic performances.
Pakistan Journal of Engineering and Applied Sciences, 2016
One of the major concerns in structural engineering is the development of new design concepts to improve structural performance and safety from the damaging effects of destructive earthquakes and winds. With the intent to achieve cost-effective seismic-resistant constructions the structures must be constructed to dissipate a large amount of seismic energy. Supplemental damping strategies are useful for improving the seismic response of structures to natural and manmade hazards. Passive energy dissipation devices, when integrated into a structure, dissipate a part of the input energy, thereby reducing energy dissipation requirement on primary structural members and reducing probable structural damage. The purpose of this research is to study the performance of building structure by using passive energy dissipation devices. Different types of devices used in this study are hysteretic dampers, friction dampers viscous and visco-elastic dampers. The finite element modeling technique is ...
Seismic Performances of Conventional and LRB-Isolated Buildings Comparing to Seesaw Buildings
Journal of Applied Engineering Sciences
Using seesaw structural system equipped with energy dissipating devices has been considered as a low-cost and low-tech way for creation of earthquake-resilient buildings. In this paper by considering three groups of multi-story buildings, including conventional buildings, LRB-based isolated buildings and building with seesaw structure, equipped with a newly introduced type of structural fuses, their seismic performances have been compared through nonlinear time history analyses (NLTHA). The employed fuses in seesaw buildings are a specific type of yielding plate dampers, called Multiple Curved Yielding Plate Energy Dissipater (MCYPED), installed at the bottom of the all circumferential columns of the lowest story of the building. To show the efficiency of the proposed seesaw system in comparison with other two mentioned groups, first, by finite element modeling, verified by experimental results, the initial and secondary stiffness values as well as the yielding and ultimate strength...
NUMERICAL MODELING OF THE SEISMIC RESPONSE OF BUILDINGS WITH ENERGY DISSIPATORS
The poor performance of many framed RC structures in recent strong earthquakes has alerted about the need of improving their seismic behavior especially when they are designed according to obsolete seismic codes. Sometimes, RC buildings show a low level of structural damping, important second order effects and low ductility of the connecting joints, among other defects. These characteristics allow proposing the use of energy dissipating devices for improving their seismic behavior, controlling their lateral displacements, providing additional damping and ductility. In this work, the nonlinear dynamic response of RC buildings with energy dissipating devices is studied using advanced computational techniques. A fully geometric and constitutive nonlinear model for the description of the dynamic behavior of framed structures is used. The model proposed for the structures and the dissipating devices is based on the geometrically exact formulation for beams which considers finite deformation and finite strains. The equations of motion of the system are expressed in terms of sectional forces and generalized strains and the dynamic problem is solved using the displacement based method formulated in the finite element framework.
An innovative seismic protection system for existing buildings: External Dissipative Towers
IABSE Congress, Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment
This paper deals with an innovative system for seismic protection of existing buildings, especially strategic ones, patented as “Dissipative Towers”. This protection system is based on the structural coupling of the building with new steel truss towers constructed externally and then rigidly connected to the building floors by means of steel elements; the towers are erected over a rigidr.c. thick base plate that is restrained to the foundation cap with a spherical hinge located in central position. The towers are equipped with dissipative devices located between the two plates, at the angles; the effectiveness of the dampers is enhanced by the use of articulated quadrangles which amplify the vertical displacements of the devices. The effectiveness of the system can be very high and it is usually designed to satisfy the Immediate Occupancy Limit State even for high intensity earthquakes. In this paper this innovative system is described referring to the retrofit of two existing schoo...
—In some areas, such as Peru or other southern American Andean countries, the combination of high seismic risk and important socioeconomic development, with the consequent pressing problem of social housing, generates the need of realizing cheap, fast to execute and seismo-resistant buildings. In this view, a multistorey precast reinforced concrete structure equipped with hysteretic dissipative braces is proposed. The dissipation is ensured thanks to the employment of metallic yielding devices called shear links, allocated in steel diagonal braces, while gravity loads are supported by the precast structure. This work concerns this type of building design, performing both linear and nonlinear dynamic analysis. Particular attention is paid to the energy dissipation device modeling, with the aim of investigating its effective linear and non-linear mechanical behavior. Finally, the equivalent structural damping, provided by shear links, is evaluated through different methods suggested by American guideline FEMA 273.