Seismic assessment of earthquakeresilient lowdamage steel frames in opensees theodore karavasilis professor of structures and structural mechanics university of southampton uk 1 2. A methodology with details is provided to effectively implement feedforward neural networks with one hidden layer as a new onedimensional nonlinear smooth material model directly from a matlab. Ii algorithm, which is an elitist nondominated sorting ea. Nov 26, 2014 in this work, the response and dissipated energy of the wellknown boucwen model are examined in detail. Seismic performance evaluation of buildingdamper system. I model single degree of freedom dynamic system with bouc wen model for apply nonlinearity of the system in the opensees software. Three comprehensive video tutorials are available below to get you familiar with opensees navigator.
The boucwen bw model is a successful differential equations. This material model is an extension of the original. The tclmodelbuilder class in the opensees framework extends an instance of the tcl interpreter with commands for finite element model building and analysis. In this paper, we follow up on our recent work on lowdimensional modelling of frictional hysteresis. Experimental results obtained using the inverse pi feedforward control are compared with their counterparts using hysteresis estimates obtained from the identified boucwen model. The model is found able to accurately predict the experimentally obtained hysteresis and is implemented in the opensees software for use in seismic response analysis. The macroelement is composed of a modified boucwentype hysteresis model, a coupled viscous damper, and a nonlinear gap closure spring.
For instance, the use of original boucwen model and its extensions to soilstructure interaction include 33. Based on the identified pi model, both the inverse pi hysteresis model and feedforward controller can be determined. Verification of model reduction for hysteretic structural response by ali mohammed mirza department of civil and environmental engineering duke university. This study seeks to bridge the gap between nonlinear system identification and nonlinear dynamic finiteelement analysis.
The source code is shown below, which can be downloaded here. Hysteresis is the dependence of the state of a system on its history. Experimental and analytical investigation of the inelastic behavior of structures isolated using friction pendulum bearings. The response and dissipated energy of boucwen hysteretic. Download download sabichi hand blender manual pdf read online read online sabichi hand blender manual pdf acitydiscount sells food processors, food blenders and manual food choppers processor and hand blender for the i check out the instructions on how to turn. The open system for earthquake engineering simulation opensees is a software framework for simulating the seismic response of structural and geotechnical systems. The system takes advantage of the high inplane stiffness of clt coupled with lowyield steel dampers to control the rocking motion of the clt shear walls during earthquakes. Geotechnical elements and models in opensees pedro arduino university of washington, seattle opensees days portugal 2014, workshop on multihazard analysis of structures using opensees university of porto, porto, portugal thursday july 3, 2014 2.
The macroelement is composed of a modified bouc wen type hysteresis model, a coupled viscous damper, and a nonlinear gap closure spring. Different case studies are presented to analyze the dynamic responses of a time varying shear structural system with the early version of bouc wen babernoori bwbn hysteresis model. Fenves, title the open system for earthquake engineering simulation opensees user commandlanguage manual, year 2006. As one of the two major classes of models in nonlinear system identification, nonparametric models are proposed to be implemented into opensees. In all of these cases, measured data from the system or structure of interest can be used in order to determine any unknown aspects of the model, e. Seismic performance of pilesupported wharf structures. The bouc wen model has been used extensively to simulate hysteresis loops because it can describe the hysteretic behaviour of the force. I model single degree of freedom dynamic system with boucwen model for apply nonlinearity of the system in the opensees software. In this paper, by taking into account nearfault earthquakes. If compiling from source, tcl will be needed for all interpreters and openmpi will be needed for openseessp and openseesmp. Jul 04, 2017 seismic assessment of earthquakeresilient lowdamage steel frames in opensees 1. The element can have zero length or the appropriate bearing height. This question arises often in parameter identification issues where the input is chosen to be periodic and the experimentally obtained limit cycle is then used to determine the model parameters. A twostate hysteresis model from highdimensional friction.
Seismic assessment of earthquakeresilient lowdamage steel. The lead rubber bearings are modeled as elastomeric bearing bouc wen elements. Compute parameters of the bouc wen babernoori model of hysteresis. In particular, the boucwen model is modified to capture the combined kinematic and isotropic hardening in the hysteresis of steel devices. The model is calibrated using test data obtained under sinusoidal loading at different amplitudes and frequencies. Nov 22, 2017 download download sabichi hand blender manual pdf read online read online sabichi hand blender manual pdf acitydiscount sells food processors, food blenders and manual food choppers processor and hand blender for the i check out the instructions on how to turn. The configuration of different components of the macroelement is shown in figure 7. A straindependent postyield stiffness ratio formula is introduced into the traditional boucwen model to make it possess the asymmetrical characteristic, so that the compressive stress softening effect generally exhibited by buckling bars can be. Download download bouc wen model opensees manual read online read online bouc wen model opensees manual opensees hysteresis model opensees steel02 opensees hysteretic opensees materials bouc wen model matlab code hysteretic steel opensees bwbn opensees opensees uniaxialmaterial hysteretic in light of this, the boucwen material characterized by in parallel to the. In practice, the boucwen model is mostly used within the following blackbox approach.
Numerical simulations of steel frames equipped with. The classical boucwen cbw model is mainly used for describing rateindependent hysteresis behaviors. Opensees the open system for earthquake engineering simulation is a proprietary objectoriented, software framework created at the national science foundationsponsored pacific earthquake engineering center. Link technical knowledge base computers and structures. This command is used to construct a uniaxial boucwen pinching hysteretic material object. Contribute to rclab authgidopensees development by creating an account on github. An improved design methodology for seismic isolation.
Geotechnical elements and models in opensees pedro arduino university of washington, seattle opensees days portugal 2014, workshop on multihazard analysis of structures using opensees university of porto, porto, portugal thursday july 3. This material model is an extension of the original boucwen model that includes stiffness and strength degradation baber and noori 1985. Function loading type option plain pattern path timeseries added. Bouc and wen proposed a bouc wen hysteresis model which possesses an appealing mathematical simplicity and has the ability to represent a large class of hysteretic behaviour 11, 12. This material model is an extension of the original bouc wen model that includes stiffness and strength degradation baber and noori 1985. Linking nonlinear system identification with nonlinear. However, it has never been proved analytically that a tperiodic input leads to a tperiodic. Frontiers a comparison of three different methods for. The open system for earthquake engineering simulation. However, nearfault earthquakes, especially those with the forwarddirectivity effect, might cause early and unexpected failure of codedesigned dampers and consequent severe structural damage. The boucwen modeling has been proven fully aligned with the fact that the boucwen model exhibits force relaxation.
Experimental and analytical investigation of the inelastic. However, it is unable to describe force degradation, stiffness. Home opensees navigatoropensees navigator opensees. In these 2d opensees models, the superstructure is modeled as twodimensional frames in short span and long span respectively. In the boucwen model, a massspringdamper core is supplemented by an extra statespace equation which allows versatile approximation of a class of hysteresis loops 5,6. Equivalent linearization of the boucwen hysteretic model. Among passive energy dissipation devices, friction dampers are used worldwide as means of increasing damping into structural building systems with the aim to reduce the seismic response.
Basic truss example 2d steel moment frame building 3d concrete moment frame building calibration of element nonlinear property concrete section moment curvature performance based earthquake engineering pbee assessment tool. Download download bouc wen model opensees manual read online read online bouc wen model opensees manual opensees hysteresis model opensees steel02 opensees hysteretic opensees materials bouc wen model matlab code hysteretic steel opensees bwbn opensees opensees uniaxialmaterial hysteretic in light of this, the bouc wen material characterized by in parallel to the bouc wen model. An important modification to the original boucwen model was suggested by baber and wen 1981 and baber and noori 1985, 1986. An improved design methodology for seismic isolation systems. How can i use boucwen model in opensees software sufficiently. In this study, we considered the baber and noori extension to the original boucwen model. Analytical models for seismic assessment of reinforced. The boucwen model, widely used in structural and mechanical engineering, gives an analytical description of a smooth hysteretic behavior. Download boucwenbabernoori model of hysteresis for free. This material model is an extension of the original bouc wen model that includes pinching baber and noori 1986 and foliente 1995.
Seismic assessment of earthquakeresilient lowdamage. The lowyield steel dampers connected between two rigid clt wall panels provide. Dear opensees navigator users, thanks for your interest in opensees navigator. The boucwen model and its variantsextensions have been used in applications of structural control, in particular in the modeling of the behaviour of magnetorheological dampers, base isolation devices for buildings and other kinds of damping devices. Material implemented in opensees for yielding devices original boucwen modified boucwen includes isotropic hardening can be different in tensioncompression. Barbat engineering structures 22 2000 112112 1123 to reasonably good estimations of the second order response when compared with the results of monte carlo simulation. Experimental results obtained using the inverse pi feedforward control are compared with their counterparts using hysteresis estimates obtained from the identified bouc wen model. Nov 22, 2017 download download bouc wen model opensees manual read online read online bouc wen model opensees manual opensees hysteresis model opensees steel02 opensees hysteretic opensees materials bouc wen model matlab code hysteretic steel opensees bwbn opensees opensees uniaxialmaterial hysteretic in light of this, the boucwen material characterized by in parallel to the boucwen model. Frontiers a comparison of three different methods for the. In structural engineering, the boucwen model of hysteresis is used to describe nonlinear hysteretic systems. This thesis presents a numerical study of a novel rocking crosslaminated timber clt shear wall system for low to midrise constructions.
The smooth boucwen model of hysteresis by bouc and wen has found many engineering applications. Getting started with opensees and opensees on neeshub. Seismic assessment of earthquakeresilient lowdamage steel frames in opensees. Bwbn material pinching hysteretic bouc wen material pytzqz uniaxial materials for py, tz and qz elements for modeling soilstructure interaction through the piles in a structural foundation pysimple1 material. The buildingdamper system designed by a seismic code is usually considered to be able to withstand the attack of strong earthquakes. In the boucwenbabernoori model, this energy is used to quantify system degradation. Various 1d smooth materialelement models and opensees models.
The sources of the errors of the method of equivalent linearization applied to this model using the hypothesis of joint gaussian behaviour are examined. It allows users to create finite element applications for simulating the response of structural and geotechnical systems subjected to earthquakes. Home opensees navigatoropensees navigator opensees navigator. Users of opensees create applications by writing scripts in the tcl programming language. Pdf a consistent degrading boucwen model aristotelis. A detailed analytical study of the four regions of the. Opensees developers access the source code using apache subversion. Internal deformation is then calculated from joint j. Nonlinear hysteresis modeling of piezoelectric actuators. In this paper, three different strategies are proposed to identify general hysteretic behavior of a typical shear structure subjected to external excitations. This command is used to construct an elastomericbearing element object, which is defined by two nodes.
Pdf a consistent degrading boucwen model researchgate. Motivated by the needs in earthquake simulation, it is first investigated under which conditions and to what degree the prediction of maximum lateral drift and base shear requires accurate nonlinear hysteretic momentrotation joint models. Different case studies are presented to analyze the dynamic responses of a time varying shear structural system with the early version of boucwenbabernoori bwbn hysteresis model. This toolbox computes the parameters of the boucwenbabernoori hysteresis model using multiobjective optimization evolutionary algorithms mobeas. May 29, 20 download boucwenbabernoori model of hysteresis for free. Bouc w en model hysteresis loop is also presented in 143. Before running opensees, you need to write your tcl inputmodel. New analytical and numerical solutions are derived using a generic model formulation without any parameter constraints. It was introduced by robert bouc and extended by yikwei wen, who demonstrated its versatility by producing a variety of hysteretic patterns. You can also test you material to see the effects different parameters. Plots of a single component of the moment often form a loop or hysteresis curve, where there are different values of one variable depending on the direction of change of another. Comparison of opensees model with experimental results without local buckling 36 damagefree beam. The boucwen bw model is a successful differential equations model used to describe a wide range of nonlinear hysteretic systems.
These devices, added either inline with diagonal braces, or at the intersection zone of x and chevronbracing and installed in moment frame buildings, can reduce the demand of the primary frame system, the. Hysteresis curve obtained for the 500 dimensional frictional system with u t as in equation 2. Sep 10, 2014 geotechnical elements and models in opensees 1. Analytical hysteretic model for reinforcing bars sciencedirect. Auto equaldof commands among nodes with different ndf that share the same location in general data window added. The boucwen model has been used extensively to simulate hysteresis loops because it can describe the hysteretic behaviour of the force. This command is used to construct a uniaxial bouc wen smooth hysteretic material object. Compute parameters of the boucwenbabernoori model of hysteresis.
Bouc and wen proposed a boucwen hysteresis model which possesses an appealing mathematical simplicity and has the ability to represent a large class of hysteretic behaviour 11, 12. Verification of model reduction for hysteretic structural. Elastomeric bearing boucwen element opensees university of. Hysteretic model for steel energy dissipation devices and. However, it cannot characterize the ratedependent hysteresis precisely. Seismic response analysis of a fullscale baseisolated. This command is used to construct a uniaxial bouc wen pinching hysteretic material object. In particular, the bouc wen model is modified to capture the combined kinematic and isotropic hardening in the hysteresis of steel devices.
Linking nonlinear system identification with nonlinear dynamic. This paper proposes an analytical hysteretic model for reinforcing bars considering the effects of inelastic buckling and lowcycle fatigue. More recently, baber and noori, casciati, and reinhorn et al. You need to look at the diff equation of the bouc wen model on the reference documents at the bottom of the page on the link you sent. Make sure the numpy, matplotlib and eqsig packages are installed in your python distribution. Numerical study of pinsupported crosslaminated timber. A link object connects two joints, i and j, separated by length l, such that specialized structural behavior may be modeled. Practical soilshallow foundation model for nonlinear. W model is mainly used for describing rateindependent hysteresis behaviors. This program is intended to be selfexplanatory, nevertheless a basic user manual will be added to the website shortly. So, you need to be familiar with the way opensees specifies the model to simulate see opensees user manual.
Dec 05, 2012 the open system for earthquake engineering simulation opensees is a software framework for simulating the seismic response of structural and geotechnical systems. The coupled viscous damper simulates changes in radiation damping with increasing material nonlinearity. Opensees download website and opensees parallel download website do not provide binaries for linux, so user will need to compile the binaries from source in order to use opensees, openseessp and openseesmp. Dynamic properties of the hysteretic boucwen model. Modelling and identifying the parameters of a magneto. Hysteresis behaviors exist in piezoelectric ceramics actuators pcas, which degrade the positioning accuracy badly. This model is able to capture, in analytical form, a range of hysteretic cycle shapes matching the behaviour of a wide class of hysteretical. Auto equaldof commands among quadquadup element nodes which share the same vertical y location. For example, a magnet may have more than one possible magnetic moment in a given magnetic field, depending on how the field changed in the past. Download bouc wen babernoori model of hysteresis for free. Modifications to the original boucwen model boucwenbabernoori model. Research results indicate that the maximal absolute and relative errors of the proposed bouc wen model are less than 3.
To run opensees on a system check the version installed if any, its type serial or parallel and the instructions of how to run it on the software page associated. Theoretical issues, such as the inexistence of an elastic domain and the evaluation of the residual deformation after a loadingunloading cycle are addressed by means. This material model is an extension of the original boucwen model that. Deterioration modeling of steel components in support of. Getting started with opensees and opensees on neeshub youtube. This command is used to construct a uniaxial boucwen smooth hysteretic material object.
Linear, nonlinear, and frequencydependent properties may be assigned to each of the six deformational degreesoffreedom dof which are internal to a link, including axial, shear, torsion, and pure bending. This toolbox computes the parameters of the bouc wen babernoori hysteresis model using multiobjective optimization evolutionary algorithms mobeas. In this work, the response and dissipated energy of the wellknown boucwen model are examined in detail. Example name spaced nonlinear sdof the source code is developed by maxim millen from university of porto.
The smooth endochronic hysteretic boucwen model is studied from the point of view of random vibration. Song and pincheira 2000 developed a model that simulates postcapping behavior but. Also download the constants file here, and the ground motion file. This paper deals with the problem of characterizing analytically the limit cycle of the boucwen model. The pushover analysis result only provides the backbone information which is not sufficient enough to predict the hysteretic behavior. Getting started with opensees navigator smart structures. A straindependent postyield stiffness ratio formula is introduced into the traditional bouc wen model to make it possess the asymmetrical characteristic, so that the compressive stress softening effect generally exhibited by buckling bars can be. Contributions of this paper include a different underlying frictional model with greater intuitive appeal, new analytical insights, reduction in the number of states from six to two, 1 reduction in the number of free parameters by an order of magnitude, and demonstration of.
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