Oct 15, 2010 matrix structural analysis, steel frame analysis in sap2000 1. Any differences in the functions or adjustment values are marked in each case. In addition, damping matrix identification may be useful in diagnostics or health monitoring of structures. Damping matrixs ability affects only artifacts and creatures on the battlefield. The sap name has been synonymous with stateoftheart analytical methods since its introduction over 30 years ago. 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. Sap2000 1 2 overview of the tutorial sap2000 is object based. Ansys tutorials for undergraduate mechanical engineering. Mar 21, 2015 modal and response spectrum is 18932002 analysis 0f r.
Beam detailing package is compatible with different structural analysis software such as etabs 20. Polyone offers an extensive library of technical data sheets to aid you in planning for any application. The stiffness method is a very effective method for analyzing structures using a computer. Nonlinear time history analysis of concrete gravity dam by. Effects of damping on mode shapes, volume 1 see other formats. Most important is to keep in mind that each ability can only be used once each turn. Demonstration of lateraltorsional coupling in building. A damping value of 99% is used for all modes to prevent vibration. As stated in the sap2000 analysis reference manual. Matrix structural analysis, steel frame analysis in sap2000. 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. Ive modeled a simple 2 dof structure in etabs then manually computed the modal analysis. Sap a structural analysis program for linear systems.
Congratulations on your purchase of this b52 professional matrix 2000. Construction design with sap2000 desain konstruksi dengan sap 2000 csi analysis reference manual csi automated lateral loads manual dabt2 tinh noi luc sap2000 v7. Overview key features of sap2000 modelling of elements analysis capabilities viewing results tutorial example. Documentation of damping capacity of metallic, ceramic and metalmatrix composite materials j. It comes in several versions standard, plus and advanced. Review and cite sap2000 protocol, troubleshooting and other methodology information contact experts in sap2000 to get answers. The damping matrix for element j of the material is computed as.
Any modal damping specified as additional material damping will also be included in linear and nonlinear directintegration time history load cases. The equivalent damping coefficient, c, is found to be 0. 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. Desain konstruksi dengan sap 2000 csi analysis reference manual csi automated lateral loads manual dabt2 tinh noi luc sap2000 v7. Computation of a damping matrix for finite element model updating by deborah f.
The second history starts from the first history, and applies the seismic acceleration. Full text of nasa technical reports server ntrs 19770022610. They are not intended to be used as guides for determining suitable modeling methods for any application. Lavernia materials science and engineering department of mechanical and aerospace engineering, university of cafifornia, irvine, ca 9271 7, usa. Evaluation of assumptions used in engineering practice to. 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. Aug 12, 2014 sap2000 is a program developed by the company csi, computer and structures, inc. It seems that sap 2000 software have stiffness matrix value is composed of the material but not.
The sap 2000 model was subjected to two recorded earthquake ground motions each applied in different directions. Once we have all 3 matrices namely, stiffness, mass, and damping. Sap2000 seismic analysis civil engineering community. Learn about the sap2000 structural analysis and design program. This manual describes the basic and most commonly used modeling and analysis. This command is used to construct a twonodelink element object, which is defined by two nodes. Mini sap 2000 tutorial for an example beam hands on. Additional information can be found in the online help facility available. The design was done according to the aisc steel construction manual.
However, the question fielded concerns modal damping. Analyses were performed for the range of systems described in. It doesnt seem to have an effect on the response when i change the damping, even if i set it to 0,99. 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. Documentation of damping capacity of metallic, ceramic and.
Hi guys i have a problem with constant modal damping in sap2000. 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. Direct damping is not allowed in combination with nonzero single point constraints. How to take stiffness and mass matrices from sap2000. Working with building models that were analyzed and designed in etabs, csixcad can automatically create plans, elevations, schedules, and 3d bim models. Reference manual that cannot be edited in the graphical user interface can use. Once the damping system reaches its yield deformation. Figure 4 shows the matrix of results corresponding to the 768 nonlinear analyses conducted in terms of. Sap 2000 reference manual free ebook download as pdf file. Longoria department of mechanical engineering the university of texas at austin july 20, 2014 me 144l dynamic systems and controls lab longoria.
N internal force vector which is in a nonlinear relation to the d shift vector. Damping faq technical knowledge base computers and. 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. This tutorial describes the modeling and analysis of a sevenstory twodimensional frame. Sap2000 is a registered trademark of computers and structures, inc. This matrix is restricted to the shape of the stiffness matrix, meaning that modal damping does not couple elements that are. I compare the result with my manual calculation in matlab. Influence of dynamic amplification factor on response of steel highway bridge proceedings of 29 th research world international conference, las vegas, usa, 16th17 march 2017, isbn. This paper presents the dynamic nonlinear time history analysis of a concrete gravity dam by using csi sap 2000. Jun 22, 2014 however, the question fielded concerns modal damping. Pushover analysis is a static, nonlinear procedure using simplified nonlinear technique to estimate seismic structural deformations. Seismic response of single degree of freedom structural.
Click download to get the full free document, or view any other matrix pdf totally free. A concrete gravity dam model is prepared in sap 2000 to perform the time history analysis. 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. A sap 2000 analysis was conducted to obtain theoretical predictions and demands values for design. Structural software for analysis and design sap2000. Activated abilities that work in other zones such as bloodrush or unearth can still be activated. However, damping is extremely important in formulating predictive models of structures. For the study of each system, a soft, simple and hard rubber stiffness with altered damping values were used. Therefore, dynamic analysis methods forestimating the response of a concrete gravity dam plays an extraordinary role. Csi analysis reference manual documentation computers.
Damping matrix on the other hand is a card i fear when playing the deck. 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. Chapter 2 introduction to the stiffness displacement. These exercises are intended only as an educational tool to assist those who wish to learn how to use ansys.
Stiffness and mass proportional damping control over selective execution of analysis cases. Before operating the instrument for the first time, it is ab. Ansys tutorials for undergraduate mechanical engineering courses. Nonlinear time history analysis obtains the response of the structure in which any nonlinear elements have been defined. For each material, you may specify a mass coefficient, a, and a stiffness coefficient, b. Extract the sap2000 stiffness matrix for a twostory frame and compare it to the manual solution. Triggered abilities starting with when, whenever, or at are unaffected.
If rayleigh is selected rayleigh damping is applied in a global way, i. The sequence and structure of the manual follows the input and results windows. Can i extract stiffenes matrix equation and mass matrix equation. The third part of this volume, the sap2000 introductory tutorial manual, is intended to provide firsttime users with handson experience. Sap 2000 reference guide cartesian coordinate system. Pdf csi anal y sis reference manual for sap2000, etabs.
Mar 11, 2014 therefore, for tall buildings, buildings with torsional irregularities, or nonorthogonal systems, a dynamic procedure is required. Sap90, sap2000, safe, floor and etabs are trademarks of. The earthquake analysis capabilities of sap2000 are demonstrated using a railroad bridge bent designed in accordance with the arema manual for railway engineering. Threedimensional static and dynamic analysis of structures. Csi analysis reference manual for sap2000, etabs, and safe2007. The manual is intended to be an introduction to the seismic analysis of concrete. It is strongly recommended that you read this manual and work the tutorial before attempting a real project using sap2000. If the system has n degrees of freedom u n and is under application of m damping forces. Mini sap 2000 tutorial for an example beam hands on exercise. The state equations of the flexible arm is the same as equations 1 except matrix a which becomes. Sap2000 manual sap2000 is a program developed by the company csi, computer and structures, inc. Within all load cases of a certain type, damping is applied consistently, though additional damping may be added to individual load cases. Pilkey dissertation submitted to the faculty of the virginia polytechnic institute and state university.
C is the damping matrix, r is the vector of internal forces, x 7g is the ground acceleration, and 6 denotes the time derivative. Dynamic analysis of foundations for the effects of. It is expressed in terms of the natural frequency and the amount of damping of. The matrix 2000 is a complete sound reinforcement solution consisting of two. A searchable and comprehensive reference manual which covers the general technical topics fundamental to modeling, analysis, and design using sap2000, csibridge, etabs, and safe. Use the selections below to find a material by trade name or resin type. In applied mathematics, a damping matrix is a matrix corresponding to any of certain systems of linear ordinary differential equations. 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. 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. Computation of a damping matrix for finite element model updating. Acknowledgements the work in this thesis has been performed at the department of construction sciences, at lund university. Matrix analysis of structural dynamics, applications and earthquake engineering. 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.
Etabs has been enhanced for compatibility with csixcad, a new plugin from computers and structures, inc. You mentioned you have a damping ratio and wish to form the damping matrix. So if they use that aetherling to dodge your murder and dont have anything else caged get someone to throw another removal. Dovey department of civil engineering, university of california, berkeley, california 94 720, usa received 22 january 1973 the current version of the computer program sap for the. Damping of stiff elements with inelastic softening technical. It is clear that, the air damping is negligible for the flexible mode, because the deflection of the flexible mode is small 18. Damping technical knowledge base computers and structures. Pushover analysis option will allow engineers to perform pushover analysis as per fema 356.
Jun 22, 2014 damping, a property of the material and the structure, influences dynamic response. Sap 2000 reference manual cartesian coordinate system. How to use this manual 1 introduction usm 36 issue 2 1220 1 1. Sap 2000 which is chosen as a benchmark for validating the results. Damping, a property of the material and the structure, influences dynamic response.
A certain type of damping is available for each type of load case. 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. Geometry of frame dofs load vector stiffness matrices of members assemblage and band width equilibrium equation for joint f. Base isolation on sap2000, how do i determine the effective damping of a nllink. The objective of this work is to find a robust, practical procedure to identify damping matrices. As explained in the csi analysis reference manual viscous proportional damping, page 79, the damping matrix for element j is computed as. Finite element steadystate vibration analysis considering. For help locating specific information about a particular product, you can contact us for more information. The effects of the damping leakage were considerable. Base isolation on sap2000, how do i determine the effective. Explore the many sources of news, expert opinion and customer perspectives from the largest company in the world dedicated to industrial automation and information. Mass matrix may now be assembled from a load combination frame hinges for both static and dynamic nonlinear analysis. 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.
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