Time history analysis ppt


This page is devoted to frequently asked questions FAQ related to time-history analysis. On this page:. Extended Question: Are the reaction forces which are reported for direct-integration time-history analysis as follows:. Answer: Reactions include only the effects of elastic, and possibly inelastic, forces, unless links are connected to joint locations, in which case the damping forces within link objects are included during computation of joint reactions.

Answer: Output time-step size should be small enough to provide sufficient resolution for analysis. The required resolution is dependent upon the characteristics of applied loading and such structural properties as the natural periods.

The sufficiency of resolution may be determined by decreasing the time-step size until it is small enough to not affect results. Answer: Time-step size is fixed for a given time-history analysis. However, a series of nonlinear time-history analyses may be defined with variable time-step sizes, then these analyses may be chained together. All rights reserved. Powered by Atlassian.

Technical Knowledge Base. Page tree. Browse pages. A t tachments 2 Page History Scaffolding History. Copy with Scaffolding XML. Dashboard Home Time-history analysis. Jira links. Created by Ondrejlast modified on Mar 27, Powered by Atlassian Confluence 6.When using sources for evidence, you need to be able to demonstrate your knowledge of them by identifying their historical background. To do this, you need to analyse your sources. Analysis is the ability to demonstrate an understanding of the elements that contributed to the creation of a historical source.

It answers the question: 'Why does this source exist in its current form?

Analysis of Sources

There are six analysis skills that you need to master:. After completing these two steps, you can begin to show your understanding about the six features of historical sources.

Based upon what you found in your reading and background research, answer the following questions for each of the six analysis skills. What is the explicit meaning of the source? What is the implicit meaning of the source? How does this source corroborate the information from another source? How does this source contradict the information from another source?

time history analysis ppt

Who created the source? What kind and type of source is it? From what point of view is the source created? When was the source created?

time history analysis ppt

For what purpose was this source made? Once you have been able to answer all of the question above, you are ready to demonstrate your complete source analysis. An analysis paragraph should demonstrate your awareness of all six analysis skills in a short paragraph. This letter was written by John Smith to record the events of the battle for his family at home. Your source analysis becomes a vital step in your ability to evaluate your sources in your assessment pieces.

This is most important in written essayssource investigations and short response exams. You will use different parts of your analysis to help justify a source's usefulness and reliability.

No personal information is collected as part of this quiz. Only the selected responses to the questions are recorded. Key Question 2. Background Research 3. Sub-questions 4.

CSI ETABS - 21 Time History Analysis (scale factor discussed) - Part 1

Source Research 5. Organise Quotes 6. Topic Sentences 7. Hypothesis 8. Draft Writing 9. Source Criticism Analysis. Analysis of Sources. Royer, LN. Public Domain. What is 'source analysis'? Watch a video explanation on the History Skills YouTube channel:.Artificial accelerograms ; Direct integration methods ; Inertia and damping forces ; Linear and nonlinear analysis ; Natural records ; Seismic loading.

Most of the current seismic design codes belong to the category of prescriptive design procedures or limit-state design procedureswhere if a number of checks are satisfied, then the structure is considered safe since it fulfills the safety criterion against collapse.

A typical limit-state-based design can be viewed as one- i.

time history analysis ppt

Existing seismic design procedures are based on the principle that a structure will avoid collapse if it is designed to absorb and dissipate the kinetic energy that is induced during a seismic excitation. Most of the modern seismic norms express the ability of the structure to absorb energy through inelastic deformation using a reduction or behavior factor that depends on the material and the Skip to main content Skip to table of contents.

Encyclopedia of Earthquake Engineering Living Edition. Contents Search. Time History Seismic Analysis. Living reference work entry First Online: 21 July How to cite. Synonyms Artificial accelerograms ; Direct integration methods ; Inertia and damping forces ; Linear and nonlinear analysis ; Natural records ; Seismic loading.

This is a preview of subscription content, log in to check access. Anastassiadis K, Avramidis I, Panetsos P Concurrent design forces in structures under three-component orthotropic seismic excitation. ASCE Seismic rehabilitation of existing buildings. Athanatopoulou AM Critical orientation of three correlated seismic components.

CEN Eurocode 8: design of structures for earthquake resistance. EN Fajfar P A nonlinear analysis method for performance-based seismic design. Fib Probabilistic performance-based seismic design. Bulletin Fragiadakis M, Papadrakakis M Modelling, analysis and reliability of seismically excited structures: computational issues. Ghersi A, Rossi PP Influence of bi-directional ground motions on the inelastic response of one-storey in-plan irregular systems.To browse Academia.

Skip to main content. Log In Sign Up. This is primarily being adopted to accommodate parking or reception lobbies in the first storey. Whereas the total seismic base shear as experienced by a building during an earthquake is dependent on its natural period, the seismic force distribution is dependent on the distribution of stiffness and mass along the height.

The behaviour of a building during earthquakes depends critically on its overall shape, size and geometry, in addition to how the earthquake forces are carried to the ground. The earthquake forces developed at different floor levels in a building need to be brought down along the height to the ground by the shortest path; any deviation or discontinuity in this load transfer path results in poor performance of the building.

Buildings with vertical setbacks like the hotel buildings with a few storey wider than the rest cause a sudden jump in earthquake forces at the level of discontinuity. Buildings that have fewer columns or walls in a particular storey or with unusually tall storey tend to damage or collapse which is initiated in that storey. Many buildings with an open ground storey intended for parking collapsed or were severely damaged in Gujarat during the Bhuj earthquake.

Buildings with columns that hang or float on beams at an intermediate storey and do not go all the way to the foundation, have discontinuities in the load transfer path.

They highlighted the importance of explicitly recognizing the presence of the open first storey in the analysis of the building, involving stiffness balance of the open first storey and the storey above, were proposed to reduce the irregularity introduced by the open first storeyAwkar and Lui[3], studied responses of multi-story flexibly connected frames subjected to earthquake excitations using a computer model.

The model incorporates connection flexibility as well as geometrical and material nonlinearities in the analyses and concluded that the study indicates that connection flexibility tends to increase upper stories' inter- storey drifts but reduce base shears and base overturning moments for multi-story frames. The shear wall and diaphragm connection with hook deflects more when compared to the other two configurations. Hence, the shear wall- diaphragm connection with hook was more efficient under dynamic lateral loA full time history will give the response of a structure over time during and after the application of a load.

To find the full time history of a structure's response, you must solve the structure's equation of motion III. Response spectrum analysis is an useful technique for time history analysis of structure when the structure shows linear response. ETABS is integrated software for analysis and design of structures. Models are prepared by using assumptions; input data is feed into the ETABS to analyse the structural parameters such as base shear, base moment, lateral displacement, storey drift, time period, bending moment and axial force.

Advanced analytical techniques allow for step-by-step large deformation analysis, Eigen and Ritz analyses based on stiffness of nonlinear cases, Catenary cable analysis, material nonlinear analysis with fiber hinges, multi-layered nonlinear shell element, buckling analysis, progressive collapse analysis, energy methods for drift control, velocity-dependent dampers, base isolators, support plasticity and nonlinear segmental construction analysis.

ETABS is general-purpose civil-engineering software ideal for the analysis and design of any type of structural system. Basic and advanced systems, ranging from 2D to 3D, of simple geometry to complex, may be modelled, analysed, designed, and optimized using a practical and intuitive object-based modelling environment that simplifies and streamlines the engineering process. An additional suite of advanced analysis features are available to users engaging state-of-the-art practice with nonlinear and dynamic consideration.

Integrated modelling templates, code-based loading assignments, advanced analysis options, design-optimization procedures, and customizable output reports all coordinate across a powerful platform to make ETABS especially useful for practicing professionals V. The analysis can be performed on the basis of external action, the behaviour of structure or structural materials, and the type of structural model selected. Linear dynamic analysis can be performed by response spectrum method.

The significant difference between linear static and linear dynamic analysis is the level of the forces and their distribution along the height of structure. Nonlinear static analysis is an improvement over linear static or dynamic analysis in the sense that it allows inelastic behaviour of structure.

A nonlinear dynamic analysis is the only method to describe the Non-linear static analysis Non-linear static analysis is the method of seismic analysis in which behaviour of the structure is characterized by capacity curve that represents the relation between the base shear force and the displacement of the roof. It is also known as Pushover Analysis. In that method the peak response of structure during an earthquake is obtained directly from the earthquake response, but this is quite accurate for structural design applications.

It is an important technique for structural seismic analysis especially when the evaluated structural response is nonlinear.To browse Academia.

Time history analysis - diagrams

Skip to main content. Log In Sign Up. JMiguel Mena. Open Existing Model and Unlock Model 11 2. Delete Existing Seismic Load Case 14 3. Define Time History Function 15 4. Specify Time History Cases 18 5. Run Analysis 23 6. View Modal Analysis Results 26 7. View Time History Analysis Results 29 8. Model has to be unlocked first before do any modification by clicking on Unlock Model button. ETABS will delete all analysis and design results after unlock. Note: To view coordinate of each point on graph, move cursor over this graph, location of current point over cursor on graph will display as red dot and coordinate of cursor is shown at bottom of graph.

From above graph found that total time is 12 sec. Output time step size should be set such a way that the peak amplitude points on the time history function are not missed. Because the values along Y axis of time history function as specified in step 3 are normalized by ground acceleration gthe scale factor will be value of g 9. This scale factor can also be used to increase or decrease the time history magnitude for difference soil condition, site location…etc.

ETABS will display deformed shape of model when analysis complete. Model will be unlocked by clicking on Unlock Model button. Right click on desired wall panel to view particular analysis result.

Note: Analysis results at particular location will display at the bottom of window when move mouse cursor over this diagram.

Structural dynamics

Same as shear wall panel, right click on desired wall panel to view particular analysis result. Load combinations have been defined as selected code from previous step.The Free Timeline Template for PowerPoint is the commonly use management tool for training and development on regular basis.

It is an outstanding diagram to help visualize complex concepts and data in easily understandable format. It represents an event or process over specific timeframe and visually analyze data. The free PowerPoint template is a 2-slide fully customizable timeline diagram of awesome infographics.

It is a horizontal timeline template containing five and four milestone diagrams. It can help display the breakthrough elements of company or project with attractive illustrations of pre-define period.

Further, the infographics inside the circular icons can demonstrate number of ideas in different presentations. These infographics include, document, gear, truck, shield and flag. This timeline template assist users in editing and manipulating the elements of PowerPoint slides. For example, copy a segment of horizontal timeline for milestone upgrade. To do so, press ctrl and select all the items of one section. Such as, circular shape, infographic, direction node and text placeholders.

Similarly, change the colors, size, placement, shape effects, animations and more using easy options available in PowerPoint. Additionally, use the timeline diagram template for readymade presentation by either copying slide or individual objects.

The SlideModel. The creative design of free PowerPoint template for timeline is a flexible presentation with plenty options to modify it.

This is a useful template diagram for business and educational purposes. For instance, make a business development plan and use the milestone to track the progress like Gantt chart timeline. Also, in academics, it can help teachers to create an interactive roadmap of course topics and steps in a process. Modern Aspect Ratio. Instant Access and Download. New Templates every week. Take the most of every platform using the tool you like. Open in Google Slides. Europe Africa Asia Oceania.

Tables Comparison Tables Creative Layouts. Item FFThe theoretical developments in time series analysis started early with stochastic processes. The first actual application of autoregressive models to data can be brought back to the work of G. U Yule and J. Walker in the s and s. During this time the moving average was introduced to remove periodic fluctuations in the time series, for example fluctuations due to seasonality.

It took until before this was accomplished. At that time, the classic book "Time Series Analysis" by G. Box and G. Jenkins came out, containing the full modeling procedure for individual series: specification, estimation, diagnostics and forecasting. Nowadays, the so-called Box-Jenkins models are perhaps the most commonly used and many techniques used for forecasting and seasonal adjustment can be traced back to these models. These techniques, however, are only applicable for stationary time series.

However, especially economic time series often exhibit a rising trend suggesting non-stationarity, that is, a unit root. Tests for unit roots developed mainly during the s. In the multivariate case, it was found that non-stationary time series could have a common unit root. These time series are called cointegrated time series and can be used in so called error-correction models within both long-term relationships and short-term dynamics are estimated.

These models allow parameterization and prediction of non-constant variance. These models have thus proved very useful for financial time series. The invention of them and the launch of the error correction model gave C. J Granger and R.

Other non-linear models impose time-varying parameters or parameters whose values changes when the process switches between different regimes.

time history analysis ppt

These models have proved useful for modeling many macroeconomic time series, which are widely considered to exhibit non-linear characteristics. Department of Statistics. To submenu.

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