The analysis of structure by using equivalent static method, time history method and response spectrum method has been surveyed. The method presented in this course is widely used and is applicable to any structure or equipment that can be modeled as a singledegreeoffreedom sdof system. The method is only approximate, but it is often a useful, inexpensive method for preliminary design studies. Introduction the most direct description of an earthquake motion in time domain is provided by accelerograms that are recorded by instruments called strong motion accelerographs. Responsespectrum analysis provides insight into dynamic behavior by measuring pseudospectral acceleration, velocity, or displacement as a function of. A comparative analysis on absolute and srss methods of. Using the acceleration response spectrum, an equivalent static load is derived which will provide the same maximum response as that obtained in each. Response spectrum method and time history analysis of. Earthquake analysis and design of simple structures and. Responsespectrum analysis rsa is a lineardynamic statistical analysis method which measures the contribution from each natural mode of vibration to indicate the likely maximum seismic response of an essentially elastic structure. Sep 10, 20 response spectrum method is favoured by earthquake engineering community because of.
Construction of design response spectrum the chilean way. A response spectrum method for stationary random vibration analysis of linear structures is developed. Nov 22, 2017 equivalent static method esm and response spectrum method rsm both attempt to quantitatively estimate force due to an earthquake on a structure in terms of a set of static forces applied at specific points. Response spectrum method in seismic analysis and design of structures ajaya k u m a r gupta. Understanding the use and applications of shock response spectrum method article pdf author.
A plot of the peak value of a response quantity eg. Understanding the use and applications of shock response. This command should appear as part of a loading specification. Consider the following periodic triangle wave signal, having period t0 4ms, shown here graphically.
Response spectrum method, time history method,earthquake, dynamicanalysis. Useful elearning website will also be shown to give idea about topic clearly. It is an approach to finding earthquake response of structures using waves or vibrational mode shapes. The method is based on the assumption that the input excitation is a wide. Response spectrum method of analysis it provides a technique for performing an equivalent static lateral load analysis. This is usually accomplished by physically andor verbally. Determination of standard response spectra and effective. Many authors tried to study analysis of multistory building one or more method. The method presented in the course is widely used and is applicable to any structure or equipment that can be modeled as a singledegreeoffreedom sdof system.
A response spectrum method for stationary random vibration analysis of linear, multi. Results sign method for response spectrum analysis response spectrum analysis calculates and combines the pseudo maximum responses of natural vibration modes against a given design spectrum by assuming each mode as an independent single degree of. We are interested in the maximum relative displacement, velocity, and total accelerations. Two basic methods are widely used for dynamic seismic analysis, namely, response spectrum and time history methods. The standard echo interval and two different lengths of acquisition time, t wl 35t 1g and t ws 35t 1w, are used in the measurement. The paper presents the method of calculation the shock response spectrum, which is corresponding to an acceleration signal exciting the resonance vibration of substructures. Navy methodology for qualifying shipboard equipment and supporting structures for survival of shock loading. This command may be used to specify and apply a custom i.
The purpose of this report is to present a synthesis method using wavelets. Navy methodology for qualifying shipboard equipment and supporting structures for survival of shock loading due to underwater explosions undex. Keywords dynamic analysis, response spectrum method, absolute method, srss method, joint displacement, story drift, staad pro analysis, staad generic method. The mathematical principles of oscillations in ndegreeoffreedom systems. Prokssor of civil engineering north carolina state university f o r e w o r d by william j. This report is the development of response spectrum analysis for mdof structure in matlab. Dynamic analysis using response spectrum seismic loading before the existence of inexpensive personal computers, the response spectrum method was the standard approach for linear seismic analysis 15.
What is the difference between equivalent static analysis. Certificate this is to certify that the project entitled seismic analysis of high rise building by response spectrum method submitted by ms. Calculates the acceleration, velocity and displacement time series for. Response spectrum method of analysis with simplified. Modal analysis is performed to identify the modes, and the response in that mode can be picked from the response spectrum. Response spectrum analysis in staad explanation video methodology. Approximate modal response spectrum method of analysis. Characteristics of spectral responses for a ground motion from. Design procedures of response spectrum method and time history. Another reason is convenience in generating design response spectra rather than power spectral densities from existing data. Response spectrum analysis can be used to estimate the peak response displacement, stress, etc. The first issue is the consequences of loss of sign on the. Response spectrum method of analysis shall be performed using the design spectrum specified in clause 6.
Therefore, we can generate a response spectrum for that earthquake. For the purpose of seismic analysis, the design spectrum given in figure 1 of is. Dynamic design analysis method ddam response spectrum. Pdf origin of the response spectrum method researchgate.
A comparison is done between the static and dynamic analysis, the results such as bending moment, nodal displacements, mode shapes are observed, compared. One method is to mount the component on a shaker table and then subject it to a base excitation pulse. Comparative study of static and dynamic seismic analysis of a. Dynamic design analysis method ddam response spectrum analysis with abaqus summary the dynamic design analysis method ddam is a u. Response spectra as a useful design and analysis tool for. A response spectrum is a graphical relationship of maximum values of acceleration, velocity, andor displacement response. Structural dynamic it is the response analysis for structure subjected to dynamic loading like wind or earthquake. Response spectrum method of analysis free download as powerpoint presentation. Introduction lie srss method of combining modal maxima has found wide acceptance among structural engineers eajaged in seismic analysis. Pdf seismic analysis and design of shear walls in response. Comparative study of static and dynamic seismic analysis. Besides, food and clothing, shelter is a basic human need. Response spectra are curves plotted between maximum response of sdof system subjected to specified earthquake ground motion and its time period or.
Method dcm of fema 356, where a target displacement is calculated to which the structure is pushed. The resulting plot can then be used to pick off the response of any linear system, given its natural frequency of oscillation. The response spectrum method of analysis is developed using the following steps. The differential spectrum method is also known as the parallel tw method. It offers a simplified method for finding the design forces for structural members for. The results generated from both the method were compared. What is the difference between equivalent static analysis and. Understanding the use and applications of shock response spectrum method claudie hutin data physics france introduction definition of the shock response spectrum shock tests are performed to verify that a structure or a device can support transient vibrations encountered during its life.
Comparison between different shapes of structure by. Time history method of analysis, when used, shall be based on an appropriate ground motion and shall be performed using accepted principles of dynamics. The results are compared with equivalent static method. Cascaded analysis of secondary systems using response spectrum method. Dynamic analysis of multistory building using response. Figures and response spectrum method rsm based on the static analysis method, the response spectrum method made improvement over it, transformed the dynamic problem into the static problem by applying the mode superposition theory. Response spectrum analysis provides insight into dynamic behavior by measuring. Response spectra is produced firstly according to the earthquake wave records, and the maximum. These peak responses are then combined to estimate a total response. A comparison of both methods for earthquake multistory building presented here. The storey displacements and displacement of center of mass results have been obtained by using both static and dynamic analysis.
The calculation method is carried out in the time domain via a convolution integral. Analysis of building with response spectrum method seismic analysis of highrise building having following data is analyzed for different models of lateral load resisting systems. Pdf response spectrum method in seismic analysis and design. This dynamic analysis is analyzing a code or structure of a program while running the program. A response spectrum method for random vibration analysis of. Mar 25, 2010 cascaded analysis of secondary systems using response spectrum method. A typical combination method is the square root of the sum of the squares srss if the modal frequencies are not close. Csi etabs 19 response spectrum analysis rsa method part 1 duration. Study of base shear and storey drift by dynamic analysis. Response spectrum analysis is a linear dynamic statistical analysis method which measures the contribution from each natural mode of vibration to indicate the likely maximum seismic response of an.
Shock and vibration response spectra course unit 29. Seismic analysis of highrise building by response spectrum. The design lateral shear force at each floor in each mode is computed by staad in accordance with the is. If it is the first occurrence, it should be accompanied by the load data to be used for frequency and mode shape calculations. Pdf response spectrum method in seismic analysis and. Main features of seismic method of analysis based on indian standard 1893part 1.
The response spectrum method rsm was introduced in 1932 in the doctoral dissertation of maurice anthony biot at caltech. It allows a clear understanding of the contributions of different modes of vibration. Comparison of some code provisions prescribed by different earthquake codes. The accelerograph records three orthogonal components of ground acceleration. Srs determines the maximum or minimum of the substructure acceleration response as a function of. A response spectrum is a plot of the peak or steadystate response displacement, velocity or acceleration of a series of oscillators of varying natural frequency, that are forced into motion by the same base vibration or shock. A response spectrum method to estimate peak floor earthquakes and responding elastically is presented modal combination rules such as srss or cqc. A response spectrum method for random vibration analysis. Shock response spectrum model the shock response spectrum is a calculated function based on the acceleration time history. Procedures and examples for developing an acceleration response spectrum ars are based on the current criteria in the sdc, appendix b, and require the user to be familiar with the ars online report, caltrans fault database, ars online web tool, andthe deterministic response spectrum spreadsheet. Response spectrum method of analysis seismic analysis of. Srs determines the maximum or minimum of the substructure acceleration response as a function of the natural frequencies of a set of the single.
In this work the seismic zone is considered to be zone ii. In the following, we outline the early history of the response spectrum method. The method is based on the assumption that the input excitation is a wideband, stationary gaussian process and the response is also stationary. Pdf 49763539 response spectrum method gupta hanna yuni. The shock response spectrum is a graphical representation of an arbitrary transient acceleration input, such as shock in terms of how a single degree of freedom sdof system like a mass on a spring responds to that input. The year 2007 marks the 75th anniversary of the formulation of the concept of the response spectrum method rsm in 1932. The first data reported from an earthquake record is generally the peak ground acceleration pga which expresses the tip of the maximum spike of the acceleration ground motion figure 1.
Response spectrum analysis and equivalent static analysis. This is to certify that the project entitled seismic analysis of high rise building by response spectrum method submitted by ms. This paper presents an introduction to the computation of a response spectrum for earthquake loading. Because the longitudinal relaxation recovery of water is much faster than that of gas, the magnetization vectors of water and gas will recover completely in the echo information. Signalcalc software can be used for many sound and vibration applications including. A response spectrum is a plot of the peak values of the response displacement, velocity, or acceleration of a number of sdof systems with different natural vibration periods subjected to the same seismic i nput. This paper draws the attention of structural designers on two issues associated with the response spectrum method of seismic analysis. Response spectrum is a plot of the maximum response maximum displacement, velocity, acceleration, or an y other quantity of interest to a specified load function for all possible sdof system. However, none of the above literature explains appropriate software method for seismic analysis. Timehistory method the sdof response spectrum method can be used as long the structure or equipment can be modeled by a single degree of freedom system consisting of a spring, mass and damping. It provides a technique for performing an equivalent static lateral load analysis.
Comparative study of equivalent lateral force method and. The course presents the response spectrum method of earthquake response analysis of simple structures and mechanicalelectrical equipment. In structural engineering practice, a response spectrum description of an input is preferred because of a variety of reasons. The sdof response spectrum method usually gives less conservative results than simplified procedures, yet easy to. Response spectrum analysis rsa is a lineardynamic statistical analysis method which measures the contribution from each natural mode of vibration to indicate the likely maximum seismic response of an essentially elastic structure. Response spectrum analysis massachusetts institute of. Response spectrum method of analysis wiley online library. In this paper, a four storey reinforced concrete building with moment resisting frame of different shapes i.
If so, a time history must be synthesized to satisfy the specification. Introduction analysis and design of buildings for static forces is a routine affair these days because of the availability of affordable computers and specialized programs which can be. We discuss the vibrational versus wave methods of solution, and examine the. Response spectrum analysis provides insight into dynamic behavior by measuring pseudospectral acceleration. The specification for a base excitation shock may be in the form of a shock response spectrum. Response spectrum analysis and nonlinear properties. Comparative study of equivalent static analysis and response. The other is the capacity spectrum method csm of atc40, where the load. Obtaining joint accelerations for response spectrum analysis of multidof structure. India has been successful in meeting the food and clothing requirements of its vast population.
Methodology for developing design response spectrum for. Shock response spectrum model the shock response spectrum is a calculated function. If provided, computes the cross psd, otherwise the psd is returned. If the ground acceleration from an earthquake is known, the response of the structure can be computed via using the newmarks method.
Aug 31, 2018 channel provide you knowledge about all competitive exam including computer proficiency test and current affairs too. Responsespectrum analysis technical knowledge base. Response spectrum method, equivalent lateral force method, time history method and code provision technique. Responsespectrum analysis etabs computers and structures. There is no consensus on the particular method being best one. This spectrum is based on strong motion records of eight indian earthquakes. Equivalent static method esm and response spectrum method rsm both attempt to quantitatively estimate force due to an earthquake on a structure in terms of a set of static forces applied at specific points. The story displacement result has been obtained by using both method of dynamic analysis, and concluded that time history analysis is found to be 2 to 8% higher than that of response spectrum analysis in both type of building i. Pdf response spectrum analysis of structures subjected to.
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