It considers a massproportional and a stiffnessproportional damping in order to achive the real damping lets say 5%. The models are the same except that one model uses a tmd and the other does not. Sap2000 software analysis engine is used as the software tool for the seismic analysis. The problem is that for direct integration method, i do not know how to set a constant damping coefficient of 0. Sap2000 follows in the same tradition featuring a very sophisticated, intuitive and versatile user interface powered by an unmatched analysis engine and design tools for engineers working on transportation, industrial, public works, sports, and other facilities. When the force and velocity exceeds this limit, the additional damping force is proportional to the additional velocity by a different, smaller damping coefficient. Sap2000 software analysis engine is used as the software tool for the seismic analysis of the structure. The taylors device which has been filled with silicone oil consists of a stainless steel piston with a bronze orifice head and an accumulator. Viscous damper, seismic response, etabs 2015, time history. Viscous damper in mechanical translational systems matlab. Viscous damper with nonlinear exponent on velocity gap compression only hook tension only modelling of elements. The modeling information in this booklet was prepared for dis by button engineering.
Evaluating effects of viscous dampers on optimizing. The energy lost per cycle in a damper in a harmonically forced system may be expressed as w d i f ddx 1 where f d represents the damping force. At each of the floor levels shear wall and column were connected by rigid links to stimulate the rigidity of the floor slabs and to transfer lateral load into the wall. Sap2000 v14 structural analysis software structural analysis and design software the sap name has been synonymous with stateoftheart analytical methods since its introduction over 30 years ago. Sap2000 v14 structural analysis software kulascivilworks. In recent years, numerical tools such as finite element method have been utilized to optimize the structure of ve rubber damper devices 9, 10.
The damping properties of nonlinear viscous dampers are based on the maxwell model of viscoelasticity malvern, 1969, and may be specified for each deformational degreeoffreedom dof. Study on the effect of viscous dampers for rcc frame structure 1. Here, viscous dampers are provided to check the seismic performance of the structure. A nine storied building frame was analyzed with and without braced. They are versatile devices that can be designed to allow free movement as well as controlled damping of structures to protect them from wind load, thermal motion, or seismic events. This device is a linear spring in series with a dashpot whose forcevelocity relationship exhibits bilinear viscous behavior, typical of certain oil dampers having a relief valve. Numerical calculation with sap2000 software was used for the analysis of a. Sap2000 software uses parallel and series systems of spring and damper in linear and nonlinear analyses, respectively. Within etabs, whether the system is linear or nonlinear, these damping objects are modeled in. The energy output is available in the element nonlinear energy by. In order to decrease the total viscous damping, a larger hole density is required. Oct 15, 20 the total viscous damping of a cell consists of the squeezefilm damping due to the motion of the air in the gap and the resistance of the hole. To model the viscous damper the viscousdamper is used. Austin fox from portland was looking for software marketing resume graham matthews found the answer to a search query software marketing resume you are not allowed to view links.
Fluid viscous damper that operates according to the principle of flow of fluid through orifices. Seismic energy dissipation study of linear fluid viscous dampers in steel. It features a powerful graphical user interface that is unmatched in terms of easeofuse and productivity. For microstructures having a small number of holes per unit area u 2, the squeezefilm damping is the dominant part. Other configurations, such as single vane vwds are also available. Sap 2000 example in a recent design of a seismic retrofit we used fluid viscous dampers to reduce the response of an existing concrete parking structure to seismic forces. In part 1 we defined a viscous damper as a fundamental component to create durability and efficiency in a powertrain system by reducing torsional vibration to understand what torsional vibration is, we turn to aaron neyman, vibratech tvd snr. Study on the effect of viscous dampers for rcc frame structure under the guidance of p.
The sap name has been synonymous with stateoftheart analytical methods since its introduction over 30 years ago. Register or login essayerudite is an online you are not allowed to view links. Sap2000 is the latest version in the popular sap series of commercial structural analysis programs. Seismic energy dissipation study of linear fluid viscous dampers in. Optimization of damper location format in the rc building. The selfcentering spring viscous damper is composed of a conventional viscous damper with an external heavy duty linear spring. The magnitude of the damping force is equal to the product of the physical signal input and the relative linear velocity between the two translational conserving ports. This study will focus on the seismic design of structures with supplemental fluid viscous dampers device. Seismic energy dissipation study of linear fluid viscous dampers in steel structure design. Dec 15, 2017 this booklet provides guidelines for including dynamic isolation systems vwds in structural models of buildings subjected to earthquakes or wind. Study of nonlinear fluid viscous dampers behaviour in seismic. Viscoelastic devices have an output that is somewhere between that of a damper and a spring.
Translational viscous damper with variable damping. However, users may estimate the percentage of critical damping through either of two approaches. Product engineer and torsional vibration analyst who stated in an exclusive interview. Viscous damper with nonlinear exponent on velocity. Time history analysis was carried out and the output parameters like displacement, velocity, acceleration and base. A part of this project also deals with the qualitative damage analysis of the structure during an earthquake, with and without fvds. Sap2000 revision no 0 example 6006 5 in this example, for the linear analysis, the linear effective stiffness, k linear, is set to zero so that pure damping behavior is achieved. Viscous dampers also known as seismic dampers are hydraulic devices that dissipate the kinetic energy of seismic events and cushion the impact between structures. The software uses the finite element method for spatial discretization of the governing equations. A study on seismic response of reinforced structures. An idealized schematic of the model is presented in figure 1.
Sap 2000 is an efficient finite element modelling software. And by placing the fluid viscous dampers in selected certainfloors provides more useful. Sap2000 follows in the same tradition featuring a very sophisticated, intuitive and versatile user interface powered by an unmatched analysis engine and. Viscous fluid dampers for structural civil applications. Viscous fluid dampers, sap2000, bhuj ground motion data. Schematic drawings for typical configurations of double vane vwds are shown in appendix c. Jun 01, 2017 viscous fluid dampers vfds and viscoelastic ve solid dampers belong to rate dependent passive dampers. Non linear analysis, energy dissipation time history analysis, viscous dampers. Sap 2000 nonlinear useful for computer modeling and design of reinforced concrete and steel structures and design of systems that use fluid viscous dampers. The detailed schemeticschematic drawings of the spring viscous damper, deviator zone, and cable crosssection are shown in fig. The damper consists of a stainless steel piston, a steel cylinder divided into two champers by the piston head, a compressible hydraulic fluid. Jun, 2014 link objects are very well suited for modeling the nonlinear forcevelocity relationship of viscous damping. Axial stiffness k 25 knmm, damping coefficient cd20. This study shows that it is not necessarytwo adjacent buildings connected by a damper on all floors, but the less damper in appropriate selected locations can help reduce the earthquake response.
Viscous fluid dampers for structural civil markets. Etabs 2016 tutorial 15 modeling of dampers, direct two. Csi software does not directly report the percentage of critical damping achieved by adding discrete dampers to a model. From the time history analysis, the time dependent dynamic. Introduction in civil engineering, the problem is precisely administrated main components of the structure. Tunedmass damper tutorials computers and structures. Evaluating effects of viscous dampers on optimizing seismic. For nonlinear analysis the nonlinear stiffness, k nonlinear, is set to an approximation of the. Viscoelastic attributes of a realistic damper can be described by a combination of springs and ideal viscous dampers. Dynamic analysis of steel frame using manufactured viscous. Inside of the housing is an inertia ring with a viscous fluid fluidampr uses specialized silicone filling the cavity. It was released in 1997 and can be usedfor the dynamic analysis of structures with seismic isolation and energy dissipation systems. Chopra workshop on seismic analysis of concrete dams ussd annual meeting.
Those dof without nonlinear specification will remain linear by. Jun 22, 2014 can the software calculate the percentage of critical damping achieved by dampers added to a model. Shaking table test study on midstory isolation structures. A viscous damper has a sealed outer housing with a precision machined hub. Determining the best insertion site of fluid viscous dampers.
Viscous damping and spring force calculation of regularly. Determining the best insertion site of fluid viscous. Nonlinear viscous damping technical knowledge base. A tmd can be modeled in sap2000 using a combination of friction isolator link and a viscous damper link in series. This device is a linear spring in series with a dashpot whose forcevelocity relationship exhibits linear viscous behavior up to a specified forcevelocity limit.
Can we use sap 2000 ultimate software for nonlinear time history analysis of rcc frame equipped with viscous damper considering material nonlinearity. Introduction in civil engineering, the problem is precisely administrated main components of the structure, including the performance of such building. Register or login with over 10 years in academic writing field. To plot the results of the nonlinear analysis, you need to do a manual. The other common type of damper is a viscous damper. How to design with and model friction dampers for seismic control in structural analysis software such as etabs, sap etc. The modeling and analysis is done with sap 2000 software and the results that is, seismic parameters such as time period, base shear, lateral displacement and inter storey drift are tabulated and then comparative study of structures with and without dampers has done. Viscous damping and spring force calculation of regularly perforated mems microstructures in the stokes approximation. A physical signal input port provides the magnitude of the translational damping coefficient. The absorption of the seismic input energy in the buildings and reducing its damage are the main objectives of these devices.
Nov, 2014 for a seismic increased protection, new technologies have been developed, among these technologies there is the passive energy dissipation devices. Study on the effect of viscous dampers for rcc frame structure. Additional information is available in the csi analysis reference manual chapter xv the linksupport element, nonlinear viscous damper. Response history analysis of structures with seismic. Refer to the csi analysis reference manual for recommendations.
Vibratech tvd is a global leader in viscous damper manufacturing, engineering, and torsional vibration analysis for gas engines, diesel engines and powertrain applications. The nonlinear energy is reported separately for model objects internal element energy and support elements support element energy. Modeling of a viscoelastic damper and its application in. Since viscous damper system will be modeled as pure stiffnessfree damping behavior.
The domain was discretized using tetrahedral elements. Damping within sap2000, linear damping is included directly in the linear link property, while nonlinear damping is modeled using a viscousdamping link object in parallel with the linear link. Study the impact of using viscous fluid dampers in steel buildings. Analysis software sap 2000 sap 2000 is finite element software which performs the static or dynamic, linear or nonlinear analysis of structural systems.
A frictionspring hysteretic damper has been implemented as a new link property. Optimization of damper location format in the rc building frames. Fluid viscous damper is composed of a piston head, a piston rod and a cylinder full of a viscous fluid. Viscous wall damper modeling guide civil engineering community. Jun 21, 2014 a bilinear maxwell damper has been implemented as a new link property. Compact, yet powerful, these dampers increase structural damping lev. Most used dampers are fluid dampers, just like the shock absorbers in vehicles. Seismic performance of adjacent building using fluid viscous. In this example, nonlinear time history analysis is carried out using sap 2000 version 14 software. Among these devices, there are the fluid viscous dampers fvd which are. Tech in structural engineering, department of civil engineering.
Sap2000 advance course summer 2018 london, uk computer and structures, inc. Seismic energy dissipation study of linear fluid viscous. Sap2000 represents the most sophisticated and userfriendly release of the sap series of computer programs. Halakatti college of engineering and technology, vijayapur puneeth sajjan m. Based on aerospace technology fluid viscous dampers have been proven in extensive tests at the multidisciplinary center for earthquake engineering research mceer at the state university of new york at buffalo. The foot loads and pedistrian position were modeled with timehistory integration. Dynamic analyses of 1story moment frame with viscous dampers. Seismic performance evaluation of a spring viscous damper. Etabs 2016 tutorial 15 modeling of dampers, direct two way. The viscous wall dampers discussed here are double vane dampers with a viscous fluid layer thickness of 5mm.
For the love of physics walter lewin may 16, 2011 duration. In this report, five examples are used to verify the results obtained. Midstory isolation structure is developing from base isolation structures. Fluid viscous dampers allow the structure to recenter itself perfectly at all times. Modeling of dis viscous wall dampers in sap2000, etabs. Sap2000 follows in the same tradition featuring a very sophisticated, intuitive and versatile user interface powered by an unmatched analysis engine and design tools for engineers working on. When the force and velocity exceeds this limit, the. The viscous damper is modeled with a two node link element. Software fully interactive graphical interface for quickly creating models frame, shell, solid and nonlinear link elements. Structural software for analysis and design sap2000. Viscous fluid dampers vfds and viscoelastic ve solid dampers belong to rate dependent passive dampers.
Buildings using viscous fluid dampers pouyaazarsa m. Among these devices, there are the fluid viscous dampers fvd which are included in the passive control systems of structural response. When initially released in 1996, sap2000 was the first version of sap to be completely integrated within microsoft windows. Link objects are very well suited for modeling the nonlinear forcevelocity relationship of viscous damping. Statics, dynamics and earthquake engineering 3d finite. Damping faq technical knowledge base computers and. From its 3d object based graphical modeling environment to the wide variety of analysis and design options completely integrated across one powerful user interface, sap2000 has proven to be the most integrated, productive and practical general purpose structural program on the market today.
The translational damper block represents an ideal mechanical translational viscous damper, described with the following equations. Windows 2000, windows nt, windows xp the sap name has been synonymous with stateoftheart analytical. International journal for research in applied science. The block represents a translational viscous damper with variable damping coefficient. Linear response history analysis of concrete dams anil k. A bilinear maxwell damper has been implemented as a new link property. Six different steel frame model is set up in which placement of damper is varied. Behavior of ve rubber dampers is a rate dependent phenomenon 3 8. And by placing the fluid viscous dampers in selected certainfloors provides. Jul 14, 2015 a bilinear maxwell damper has been implemented as a new link property. Those dof without nonlinear specification will remain linear by using effective stiffness, which may. It offers many tools to aid in the quick and accurate construction of models, along with the sophisticated analytical techniques needed. As a complex structural system, the work mechanism of base isolation structure is not entirely appropriate for midstory isolation structure, and the prolonging of structural natural period may not be able to decrease the seismic response of substructure and superstructure simultaneously.
It also provides the basis for the nominal properties of these dampers and recommended property modification factor associated with the first cycle effect test. How do taylor fluid viscous dampers compare to viscoelastic devices. Fluid viscous dampers work based on the principle of dissipation of energy because of fluid flowing through orifices. Modeling fluid viscous damper in etabs introduction to dampers. Download structural design software sap2000 20 developed by computers and structures inc. To reduce the displacement of base isolated building viscous fluid dampers were designed and tested. The single bay single story frame shown in figure 1 has 5000mm bay width and 3000mm story height. Upload accelerograms to sap 2000 define the accelerogram in sap2000 the. This element follows a viscous damper hysteretic response. These rigid links were modelled as beam elements by providing beam constraints in sap 2000 software 7.