Types of dampers and their seismic performance during an. In the rubbery region, the material reaches a lower plateau in stiffness. The three point bending data and the viscoelastic damping polymers nomograph may be used to predict the general. Comparative study on the efficiency of friction and viscoelastic dampers. Viscoelastic coupling dampers vcds for enhanced performance. Design and implementation of tuned viscoelastic dampers for. Over a large frequency range, the damper exhibits viscoelastic fluid behavior. Influence of damping systems on building structures subject to seismic effects proceedings of the ninth international conference on civil and structural engineering computing, egmondaanzee, the netherlands, september 2003. Experimental study of seismic response of buildings with.
There is no comparison between the results obtained for different models of dampers. Pdf modeling of a viscoelastic damper and its application. Regarding the experiment, we report the results of an evaluation of seismic resistance against input in an. Two building structures with embedded viscoelastic and friction dampers in different. The effects of temperature on the energy dissipation of viscoelastic dampers for seismic mitigation of structures are investigated. Isolating damping tuning spring devices viscoelastic dampers. This paper is intended to introduce the results of the experiment and provide an overview of the product. Viscoelastic ve dampers have been successfully incorporated in a number of tall buildings as a viable energy dissipating system to suppress wind and earthquakeinduced motion of building structures. In this studythe effectiveness of vcds in enhancing the seismic resilience of. In traditional procedures of analysis and design of viscoelastic dampers.
Optimal design of viscoelastic dampers using eigenvalue. This type of damper dissipates the buildings mechanical energy by converting it into heat. To simulate the damper behavior, an evolutionary model is. Variation of shear storage and shear loss moduli of viscoelastic materials 5. Pdf study of viscoelastic and friction damper configurations in the. In recent years, viscoelastic dampers veds have been widely used. This study introduces a viscoelastic passive control system called rotary rubber braced damper rrbd. Viscoelastic materials book, viscoelasticity book, text book for course on viscoelasticity, engineering courses in civil, mechanical, biomedical engineering, viscoelasticity course.
The experimental results demonstrate that the addition of fluid dampers to the. Pdf a numerical and experimental investigation on selfheating. The seismic response control of multistory frame structures using optimally placed viscoelastic dampers veds within consideration of soilstructure interaction ssi effect is investigated in this paper. Passive viscoelastic constrained layer damping application for a small aircraft landing gear system by craig a. Types of dampers and their seismic performance during an earthquake. Jul 02, 2001 an efficient method of modeling the rheological behavior of viscoelastic dampers is discussed and illustrated. When the system attains a pure viscous friction at high speed and viscoelastic friction at lowspeed the damping force is called viscous viscoelastic. Structural dampers viscoelasticity mechanical engineering.
Elastoplastic time field analysis, frequency field analysis, and shaking table tests were used to analyze responses of a 15 scale threestorey reinforced concrete frame structure 3. A procedure for the parametric identification of viscoelastic dampers accounting for preload. Low temperature influence on the behavior of viscoelastic. Viscoelastic dampers ve material capable of dissipating large amounts of energy when deformed substantially improve the damping of beams and panels fillers sometimes improve damping. Optimal design of viscoelastic dampers in frame structures. Viscoelastic dampers ved have shown to be effective energy dissipation. Optimal vibration control of adjacent building structures. The vcds replace structural members, such as outriggers or coupling beams, and therefore do not occupy any. Summary viscoelasticplastic vep dampers are hybrid passive damping devices that combine the advantages of viscoelastic and hysteretic.
Page 1 of 25 viscoelastic granular dampers under low amplitude vibration b darabi1, j a rongong2 and t zhang2 1 department of mechanical engineering, islamic azad university central tehran branch, iran. The rrbd is an economical, lightweight, and easytoassemble device. Rheological modeling of viscoelastic passive dampers. Energy dissipation dampers viscoelasticity friction. Passive viscoelastic constrained layer damping application. Passive damping, seismic excitation, viscoelastic damper, friction. An alternative, the use of sustainable cork inserts to improve the damping of cores and the whole assembly is investigated in this study. The viscoelastic coupling damper vcd has emerged as a promising technology to enhance both the seismic resilience and the wind response of highrise buildings.
Results of structures with dampers viscoelastic damper, friction damper and combination of both dampers. Rod lakes, viscoelastic materials, cambridge university press, 2009. Natural frequencies and modal damping ratios, required. A number of studies have been carried out to investigate the performance of viscoelastic dampers veds and magnetorheological dampers mrds in controlling the seismic response of buildings, but very few of them regarding the effect of temperature on the behavior of those dampers. Seismic dampers friction dampers quaketek earthquake. A novel damping system, the viscoelastic coupling damper vcd, has been developed to enhance both the wind and seismic performance of highrise buildings by adding high damping elements in place of reinforced concrete coupling elements. Influence of damping systems on building structures subject. On the other hand, passive energy dissipation systems have emerged as.
The solid viscoelastic dampers are among such passive energy dissipation systems. Vibration dampers material damping structural damping. The viscoelastic structural damper application can perform the timedomain and frequencydomain analyses for a typical viscoelastic damper. The viscoelastic materials generally used are copolymers or glassy substances. Scribd is the worlds largest social reading and publishing site. Viscoelastic damper, metallic damper, tuned mass damper and friction damper etc. First type is viscoelastic liquid damper, which can have the shape of cylinder filled with silicone gel e. However, combining with these smart dampers is financially expensive and demands continuous energy input. Seismic analysis of buildings with viscoelastic damper. Study on optimal placement and reasonable number of. Some examples of these phenomena are discussed in this section1.
Viscoelastic damper products are most popular in united states, germany, and brazil. Pdf it is widely known that the mechanical characteristics of viscoelastic materials. This design and development process employs an analytical tvd model in combination with experimental dynamic model of a workpieceworkholding system, i. Viscoelastic granular dampers under low amplitude vibration. The system is assumed to be elastic and responses of the system are obtained in frequency domain for stationary random seismic excitations. There are many types of dampers for buildings, and damping through friction tends to be one of the most efficient methods of dissipating seismic energy. Energy dissipation dampers free download as powerpoint presentation. The feasibility of using viscoelastic dampers to mitigate earthquakeinduced.
Velocitydependent devices such as viscoelastic ve dampers and viscous. L for n viscoelastic damping polymers 110, 112 and to be compared to one another for their relative performance at that specific test frequency, temperature and laminate dimensional design. Viscoelastic coupling dampers vcds for enhanced performance of tall slender buildings speakers. Pdf multiobjective optimisation of viscoelastic damping. The viscoelastic damping treatment of skins is most common. To examine the response reducing effectiveness of these dampers, it is necessary that engineers are able to conduct response analysis of structures installed with added dampers accurately and efficiently. Viscoelastic attributes of a realistic damper can be described by a combination of springs and ideal viscous dampers. In this study a procedure for determining the optimum size and location of viscoelastic dampers is proposed using the eigenvalue assignment technique. Research more viscoelastic materials prior to 1997 rod lakes and john quackenbush, viscoelastic behaviour in indium tin alloys over a wide range of frequency and time, philosophical magazine letters, 74, 227232 1996. These tuned mass dampers are in general less costly than the more commonly used tmds employing viscous. The second type is viscoelastic solid damper, which consist of e. We use your linkedin profile and activity data to personalize ads and to show you more relevant ads. The passive viscoelastic dampers ve dampers are very often used in all mentioned cases.
The top supplying countries or regions are japan, china, which supply 66%, 30% of viscoelastic damper respectively. The viscoelastic solid materials are used as a means to dissipate energy in viscoelastic dampers. Combining 4548, the damping ratio of the structure in. They have proven to reduce vibration and shock problems in electronics, appliances, automobiles and aircraft. Combining structural optimization and structural control, f. The metallic damper consists of an ishaped steel beam with multiple lowyieldpoint. Similar problem is treated in 8 where viscoelastic rod was exposed to uniaxial deformation. Comparative study of viscoelastic seismic damping systems. Seismic dampers are used in damping the oscillations of a building during an earthquake. Dynamic analysis of frames with viscoelastic dampers. A new optimal method is presented by combining the weight coefficient with the. Jun 09, 2016 a schematic of a viscoelastic structural damper. Pdf evolutionary model of viscoelastic dampers for. Xu used the equivalent standard solid model of viscoelastic ve dampers to describe the energy absorption features of ve dampers.
A wide variety of viscoelastic damper options are available to you, there are 36 viscoelastic damper suppliers, mainly located in asia. Response prediction, experimental characterization and p. Hysteretic behaviour of linear and nonlinear viscous dampers 3. In particular, the effect of ve dampers model on the behaviour of a structure with dampers as a whole is. The typical viscoelastic damper consists of viscoelastic layers bonded with steel plates or solid thermoplastic rubber sheets sandwicthed between steel plates. The method uses the standard mechanical model composed of linear springs and dashpots, which leads to a prony series representation of the corresponding material function in the time domain. Viscoelastic dampers are energy dissipation devices of passive type, frequently used to mitigate excessive vibration of structures due to winds or earthquakes. Kochersberger mechanical engineering department abstract the main purpose of this report was to test several common viscoelastic polymers. Seismic analysis of a viscoelastic damping isolator. With the goal of developing impactful infrastructures and buildings that meet safety requirements for withstanding lowfrequency vibrations, viscoelastic structural dampers are a valuable resource to designers. A material selected to exist in this region is ideally suited for such devices as isolators or tuned mass dampers because the modulus varies only slightly with changes in temperature and frequency.
A new damper, combining the viscoelastic damper and metallic damper. A procedure for the parametric identification of viscoelastic. Review on viscoelastic materials used in viscoelastic dampers. Analyze the design of a viscoelastic structural damper. Fluid viscous damper is composed of a piston head, a piston rod and a cylinder full of a viscous fluid.
Before these devices can be incorporated into a structures design, there is, of. Formulation and solutions of fractional continuously variable. Durg abstractan increase in the frequency of occurrence of natural disaster events like earthquakes has been evident over the past few years. The properties of viscoelastic dampers, such as the possibility of energy. Viscoelastic tuned mass dampers tmds use viscoelastic ve material as the suspension element, in such a way that the material exhibits the functionality of both the energy dissipation device viscous and the restoring device elastic. Kelvinvoight model a spring and a viscous damper in parallel is commonly used to characterize dashpots at a single frequency. Index terms dampers, seismic evaluation, steel frames, viscoelastic. Viscoelastic dampers are frequently used to protect tall structures against vibration. Use of viscoelastic dampers in reducing wind and earthquake. Index termsdampers, seismic evaluation, steel frames, viscoelastic.