Lavernia materials science and engineering department of mechanical and aerospace engineering, university of cafifornia, irvine, ca 9271 7, usa. Damping of stiff elements with inelastic softening technical. If the system has n degrees of freedom u n and is under application of m damping forces. Matrix analysis of structural dynamics, applications and earthquake engineering. Additional information can be found in the online help facility available. The second history starts from the first history, and applies the seismic acceleration.
Sap 2000 reference guide cartesian coordinate system. Matrix structural analysis, steel frame analysis in sap2000. Damping matrixs ability affects only artifacts and creatures on the battlefield. Within all load cases of a certain type, damping is applied consistently, though additional damping may be added to individual load cases. Any differences in the functions or adjustment values are marked in each case. The equivalent damping coefficient, c, is found to be 0. As stated in the sap2000 analysis reference manual. Sap 2000 which is chosen as a benchmark for validating the results. Nonlinear time history analysis of concrete gravity dam by. Demonstration of dynamic lateraltorsional coupling in building structures ucla special case of support excitation in the case of support earthquake excitation in the ydirection, the effective earthquake load vector is given as the product of the mass matrix, a load influence vector, and the ground acceleration chopra, 2000. The manual is intended to be an introduction to the seismic analysis of concrete. This paper presents the dynamic nonlinear time history analysis of a concrete gravity dam by using csi sap 2000.
Learn about the sap2000 structural analysis and design program. Triggered abilities starting with when, whenever, or at are unaffected. For each material, you may specify a mass coefficient, a, and a stiffness coefficient, b. Explore the many sources of news, expert opinion and customer perspectives from the largest company in the world dedicated to industrial automation and information. Beam detailing package is compatible with different structural analysis software such as etabs 20. Construction design with sap2000 desain konstruksi dengan sap 2000 csi analysis reference manual csi automated lateral loads manual dabt2 tinh noi luc sap2000 v7. Structural damping using the rayleigh damping coefficients or the lehrs damping values. So if they use that aetherling to dodge your murder and dont have anything else caged get someone to throw another removal. Documentation of damping capacity of metallic, ceramic and metalmatrix composite materials j. Beam detailing user manual for etabs and sap 2000 6 1 introduction beam detailing package is a product of the the structural engineering services platform for innovation and development sespid.
Csi analysis reference manual for sap2000, etabs, and safe2007. Extract the sap2000 stiffness matrix for a twostory frame and compare it to the manual solution. Desain konstruksi dengan sap 2000 csi analysis reference manual csi automated lateral loads manual dabt2 tinh noi luc sap2000 v7. For help locating specific information about a particular product, you can contact us for more information.
As stated in the sap2000 analysis reference manual, for steadystate and powerspectraldensity cases, the hysteretic damping matrix is calculated as a linear combination of the stiffness matrix, scaled by coefficient d k, and the mass matrix, scaled by coefficient d m. Dynamic analysis of foundations for the effects of. Structural software for analysis and design sap2000. Seismic response of single degree of freedom structural. Oct 15, 2010 matrix structural analysis, steel frame analysis in sap2000 1. The sap 2000 model was subjected to two recorded earthquake ground motions each applied in different directions. Base isolation on sap2000, how do i determine the effective damping of a nllink. Geometry of frame dofs load vector stiffness matrices of members assemblage and band width equilibrium equation for joint f. For the study of each system, a soft, simple and hard rubber stiffness with altered damping values were used. Aug 12, 2014 sap2000 is a program developed by the company csi, computer and structures, inc. It is strongly recommended that you read this manual and work the tutorial before attempting a real project using sap2000. Acknowledgements the work in this thesis has been performed at the department of construction sciences, at lund university. When a realonly system matrix is factored, all forms of damping are ignored, including quiet boundaries on infinite elements and nonreflecting boundaries on acoustic elements.
Hi everyone, when you perform bmodal analysisb in sap, how it is possible to find out u damping valuesu associated with each mode shape and fundamental damping ratio in sap2k computers and structures. However, damping is extremely important in formulating predictive models of structures. The stiffness method is a very effective method for analyzing structures using a computer. This manual describes the theoretical concepts behind the modeling and analysis features offered by the sap2000 analysis engine that underlies the sap2000, etabs and safe structural analysis and design software packages.
They are not intended to be used as guides for determining suitable modeling methods for any application. Activated abilities that work in other zones such as bloodrush or unearth can still be activated. Overview key features of sap2000 modelling of elements analysis capabilities viewing results tutorial example. Base isolation on sap2000, how do i determine the effective. Congratulations on your purchase of this b52 professional matrix 2000. Polyone offers an extensive library of technical data sheets to aid you in planning for any application. A certain type of damping is available for each type of load case. Pilkey dissertation submitted to the faculty of the virginia polytechnic institute and state university. In addition, damping matrix identification may be useful in diagnostics or health monitoring of structures. The stiffness displacement method we can express u as a function of the nodal displacements uiby evaluating u at each node and solving for a1 and a2. Sap 2000 reference manual cartesian coordinate system.
Sap2000 seismic analysis civil engineering community. I compare the result with my manual calculation in matlab. How to take stiffness and mass matrices from sap2000. Ive modeled a simple 2 dof structure in etabs then manually computed the modal analysis. A damping value of 99% is used for all modes to prevent vibration. However, the question fielded concerns modal damping. Pushover analysis is a static, nonlinear procedure using simplified nonlinear technique to estimate seismic structural deformations. How to use this manual 1 introduction usm 36 issue 2 1220 1 1. C is the damping matrix, r is the vector of internal forces, x 7g is the ground acceleration, and 6 denotes the time derivative. The damping matrix for element j of the material is computed as. This element can have 1 to 6 degrees of freedom, where only the transverse and rotational degrees of freedom are coupled as long as the element has nonzero length. The design was done according to the aisc steel construction manual. The sequence and structure of the manual follows the input and results windows.
You mentioned you have a damping ratio and wish to form the damping matrix. This matrix is restricted to the shape of the stiffness matrix, meaning that modal damping does not couple elements that are. This tutorial describes the modeling and analysis of a sevenstory twodimensional frame. In the linear dynamic procedure, the building is modelled as a multidegreeoffreedom mdof system with a linear elastic stiffness matrix and an equivalent viscous damping matrix. The sap name has been synonymous with stateoftheart analytical methods since its introduction over 30 years ago. Ansys tutorials for undergraduate mechanical engineering. The nature of damping in structural systems is very complex and not properly. The engineering community is a learning platform for all engineers and engineering students around the world. A searchable and comprehensive reference manual which covers the general technical topics fundamental to modeling, analysis, and design using sap2000, csibridge, etabs, and safe. Demonstration of lateraltorsional coupling in building. Pdf csi anal y sis reference manual for sap2000, etabs. Sap2000 manual sap2000 is a program developed by the company csi, computer and structures, inc. Mini sap 2000 tutorial for an example beam hands on. Damping, a property of the material and the structure, influences dynamic response.
A sap 2000 analysis was conducted to obtain theoretical predictions and demands values for design. Once the damping system reaches its yield deformation. It doesnt seem to have an effect on the response when i change the damping, even if i set it to 0,99. Mini sap 2000 tutorial for an example beam hands on exercise. Effects of damping on mode shapes, volume 1 see other formats. Any modal damping specified as additional material damping will also be included in linear and nonlinear directintegration time history load cases. It is clear that, the air damping is negligible for the flexible mode, because the deflection of the flexible mode is small 18. 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. Direct damping is not allowed in combination with nonzero single point constraints. Most important is to keep in mind that each ability can only be used once each turn.
We have started this blog with a mission to educate and keep people informed by creating a trusted source of knowledge everything related to engineering. Reference manual that cannot be edited in the graphical user interface can use. Click download to get the full free document, or view any other matrix pdf totally free. The effects of the damping leakage were considerable. Damping matrix on the other hand is a card i fear when playing the deck. Full text of nasa technical reports server ntrs 19770022610. Csi analysis reference manual documentation computers. The accuracy of the interstory drifts predicted by the sap 2000 model, and the fact that interstory drifts realized during the test were small, suggest that global p. Etabs has been enhanced for compatibility with csixcad, a new plugin from computers and structures, inc. Review and cite sap2000 protocol, troubleshooting and other methodology information contact experts in sap2000 to get answers. Jun 22, 2014 damping, a property of the material and the structure, influences dynamic response. As explained in the csi analysis reference manual viscous proportional damping, page 79, the damping matrix for element j is computed as. If rayleigh is selected rayleigh damping is applied in a global way, i.
Matlab is useful in illustrating how to program matrix stiffness method due to the fact that it allows one to very quickly code numerical methods and has vast predefined mathematical library. Mar 11, 2014 therefore, for tall buildings, buildings with torsional irregularities, or nonorthogonal systems, a dynamic procedure is required. These exercises are intended only as an educational tool to assist those who wish to learn how to use ansys. Seismic assessment of wsdot bridges with prestressed. It comes in several versions standard, plus and advanced. Evaluation of assumptions used in engineering practice to. Jun 22, 2014 however, the question fielded concerns modal damping. Could anyone help me how to model tuned mass damper on sap2000. Nonlinear time history analysis obtains the response of the structure in which any nonlinear elements have been defined. The first case is the use of normal rubber bearing and the second one is the use of hard lead rubber bearing as an isolated base system. Sap90, sap2000, safe, floor and etabs are trademarks of. Computation of a damping matrix for finite element model updating. Damping faq technical knowledge base computers and. It is expressed in terms of the natural frequency and the amount of damping of.
Threedimensional static and dynamic analysis of structures. This command is used to construct a twonodelink element object, which is defined by two nodes. The third part of this volume, the sap2000 introductory tutorial manual, is intended to provide firsttime users with handson experience. The objective of this work is to find a robust, practical procedure to identify damping matrices.
Chapter 2 introduction to the stiffness displacement. Stiffness and mass proportional damping control over selective execution of analysis cases. Sap2000 is a registered trademark of computers and structures, inc. Therefore, dynamic analysis methods forestimating the response of a concrete gravity dam plays an extraordinary role. This manual describes the basic and most commonly used modeling and analysis. It seems that sap 2000 software have stiffness matrix value is composed of the material but not.
Ansys tutorials for undergraduate mechanical engineering courses. Before operating the instrument for the first time, it is ab. Sap a structural analysis program for linear systems. Sap 2000 reference manual free ebook download as pdf file. Computation of a damping matrix for finite element model updating by deborah f. Figure 4 shows the matrix of results corresponding to the 768 nonlinear analyses conducted in terms of. Longoria department of mechanical engineering the university of texas at austin july 20, 2014 me 144l dynamic systems and controls lab longoria. Mass matrix may now be assembled from a load combination frame hinges for both static and dynamic nonlinear analysis. Pushover analysis option will allow engineers to perform pushover analysis as per fema 356. N internal force vector which is in a nonlinear relation to the d shift vector. In applied mathematics, a damping matrix is a matrix corresponding to any of certain systems of linear ordinary differential equations. Mar 21, 2015 modal and response spectrum is 18932002 analysis 0f r.
The matrix 2000 is a complete sound reinforcement solution consisting of two. Sap2000 1 2 overview of the tutorial sap2000 is object based. Can i extract stiffenes matrix equation and mass matrix equation. The state equations of the flexible arm is the same as equations 1 except matrix a which becomes. Documentation of damping capacity of metallic, ceramic and. Working with building models that were analyzed and designed in etabs, csixcad can automatically create plans, elevations, schedules, and 3d bim models. Use the selections below to find a material by trade name or resin type. Beam detailing user manual for etabs and sap 2000 8. The earthquake analysis capabilities of sap2000 are demonstrated using a railroad bridge bent designed in accordance with the arema manual for railway engineering. Hi guys i have a problem with constant modal damping in sap2000.
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