Response spectrum method in seismic analysis and design of structures pdf

Applications of these methods is essential in the seismic design of critical structures, such as nuclear power plants and petroleum facilities. Response spectrum method distribution of forces at various storys is carried. New developments in the response spectrum method have led to calculations in seismic stresses that are more accurate, and usually lower, than those obtained by. The seismic analysis of systems and components in nuclear power plants is typically performed by dynamic analysis, in particular modal response spectra analysis. Instructional material complementing fema 451, design examples seismic load analysis 9 17 1a, 1b stiffness soft story irregularity vertical structural irregularities irregularity 1a exists if stiffness of any story is less than 70% of the stiffness of the story above or less than 80% of the average stiffness of the three stories above. Codebased procedure for seismic analysis main features of seismic method of analysis based on indian standard 1893part 1. Hence, a rigorous earthquake resistant design of lifeline structures should.

What is the difference between equivalent static analysis and. Response spectrum analysis rsa is a method widely used for the design of buildings. Comparative analysis of building by response spectrum method. Response spectrum analysis is the dominant contemporary method for dynamic analysis of building structures under seismic loading. The method provides a decoupled analysis of the secondary subsystem wherein the response is given.

Jun 08, 2014 this new textbook examines the wealth of information on the response spectrum method generated by the latest research and presents the background theory in simplified form. Aug 30, 2016 for the love of physics walter lewin may 16, 2011 duration. Earthquake analysis and design of simple structures and. Apply the equivalent lateral force method of analysis to determine seismic demands on building structures as a final design or as a preliminary design for more rigorous analysis methods. Responsespectrum analysis 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. Seismic analysis single point response spectrum analysis.

Time history method of analysis, when used, shall be based on an appropriate ground motion and shall be performed using accepted principles of dynamics. In this approach, which is similar to the response spectrum procedure for the analysis of classically damped systems, the only required information regarding the ground motion input is its response spectrum. It is part of the process of structural design, earthquake engineering or structural assessment and retrofit see structural engineering in regions where earthquakes are prevalent. A response spectrum approach for the analysis of nonclassically damped structural systems is presented. Response spectrum analysis, elastic design spectra. The resulting plot can then be used to pick off the response of any linear system, given its natural frequency of oscillation. The method presented in the course is widely used and is applicable to any structure or equipment that can be modeled as a singledegree of freedom sdof system. Bridge approach embankments and fills through which cutandcover tunnels are constructed should be designed to remain stable during the design seismic event because. 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. An improved response spectrum method for calculating. A new response spectrum method is developed for seismic analysis of linear multi. Response spectrum and pushover analysis are the most practical seismic analysis methods for most structures. Convert the combined maximum response into shears and moments for use in design of the structure. Technical seminar response spectrum analysis and seismic.

This volume elucidates the design criteria and principles for steel structures under seismic loads according to eurocode 81. Dynamic analysis of multistory building using response. Responsespectrum analysis computers and structures. Pdf the approaches to seismic analysis of buildings.

Response spectrum method in seismic analysis and design of structures new directions in civil engineering gupta, ajaya kumar on. Response spectrum method distribution of forces at. Seismic analysis of highrise building by response spectrum method abstract. The structural components of the building are safe in shear and flexure. 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. Sep 10, 20 equivalent lateral force for an earthquake is defined as a set of lateral force which will produce the same peak response as that obtained by dynamic analysis of structures. An improved response spectrum method for calculating seismic design response. Linear seismic analysis is done for the building by static method seismic coefficient method and dynamic method response spectrum method using staadpro as per the is1893 2002part1. Fundamental principles from structural dynamics, theory of random processes and perturbation techniques are used to develop a new method for seismic analysis of multiply supported secondary subsystems, such as piping attached to primary structures.

From static and dynamic of structures by ed wilson 1 modified july, 2014 15. In the present study, the response spectrum analysis. The course presents the response spectrum method of earthquake response analysis of simple structures and mechanicalelectrical equipment. Instructional material complementing fema 451, design examples seismic load analysis 9 2 topic objectives selection of method of analysis description of analysis techniques modeling considerations system regularity load combinations other considerations drift. For the building of example 1, the dynamic properties natural periods, and mode shapes for vibration in the xdirection have been obtained by carrying out a free vibration analysis table 2. Describe the similarities and differences in modal response spectrum analysis and linear response history analysis and explain how these methods can be. The second model can be used for handcalculations as a cantilever with two masses. Seismic load was defined by lateral force method, modal response spectrum, nonlinear timehistory analysis and pushover analysis. 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. Hence it is important to have a firm understanding of fundamental theoretical concepts.

Whether youve loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them. Response spectrum method in seismic analysis and design of. Design of steel structures for buildings in seismic areas. The first two steps do not have approximations,while the third step has some approximations. Floor response spectrum method for seismic analysis of. 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. Introduction one of the emerging fields in seismic design of structures is the performance based design. This video explains the introduction to single point response spectrum analysis of vertical frame structure. Earthquake design spectra given a earthquake ground acceleration, there is no difficulty to compute response using newmarks method as the previous example.

Mar 11, 2014 seismic analysis is a subset of structural analysis and is the calculation of the response of a building or nonbuilding structure to earthquakes. Response spectrum method of analysis mechanical engineering. Response spectrum method in seismic analysis and design of structures crc press book new developments in the response spectrum method have led to calculations in seismic stresses that are more accurate, and usually lower, than those obtained by conventional methods. For the unburied pipeline, earthquake design motions are typically presented in the form of a seismic time history ground motion or a design response spectrum. Because the srss combination method is most closely aligned to reality, caesar ii defaults to this missing mass combination method. Datta while numerous books have been written on earthquakes, earthquake resistance design, and seismic analysis and design of structures, none have been tailored for advanced students. Seismic analysis of highrise building by response spectrum. Further, the seismic analysis of structures cannot be. Pdf response spectrum analysis of structures subjected. New developments in the response spectrum method have led to calculations in seismic.

Simplified models of long tunnels are commonly adopted in seismic design by practitioners, in which the tunnel is usually assumed as a beam supported by the ground. Seismic design of buildings worked examples worked examples presented at the workshop ec 8. Building details mass, stiffness and damping matrix dynamic equilibrium equation decoupling of equation of motion modal response from spectrum total response at floor example problem summary. With this book, readers will gain proficiencies in the following. Response spectrum analysis of structures subjected to spatially. Therefore, we can generate a response spectrum for that earthquake. 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. This is unlike all other industries where seismic analysis is based on static methods defined in standards such as american society of civil engineers asce7. As a result, response spectrum analysis iscalled an approximate analysis. A response spectrum approach for seismic analysis of. This new textbook examines the wealth of information on the response spectrum method generated by the latest research and presents the background theory in simplified form.

For the love of physics walter lewin may 16, 2011 duration. The main reasons for the widespread use of this method are. The method provides a decoupled analysis of the secondary subsystem wherein the response is given in terms of response spectra associated with the attachment points floors. Seismic analysis is a subset of structural analysis and is the calculation of the response of a building or nonbuilding structure to earthquakes.

Worked examples illustrate the application of the design rules. This was then further developed into a design response spectrum for use in structural design, and this basic form with some modifications is now the basis for structural design in seismic regions throughout the world typically plotted against structural period, the inverse of frequency. While numerous books have been written on earthquakes, earthquake resistance design, and seismic analysis and design of structures, none have been tailored for advanced students and practitioners, and those who would like to have most of the important aspects of seismic analysis in one place. India has been successful in meeting the food and clothing requirements of its vast population. Applications of these methods is essential in the seismic design of critical structures, such. 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. Seismic analysis of long tunnels is important for safety evaluation of the tunnel structure during earthquakes. The aim of this study is to design and to perform the comparative analysis of response spectrum methods for the economic design for the seismic building, and the results are discussed below, short term deflection of all horizontal members is within 5 mm. Department of engineering science and mechanics, virginia polytechnic institute and state university, blacksburg, va 24061, u. Example 2 calculation of design seismic force by dynamic analysis method problem statement.

The response spectrum method of analysis is developed using the following steps. Preethi published on 20180730 download full article with reference data and citations. What is the difference between equivalent static analysis. Variations of the ground motion due to wave passage, loss of coherency with distance. This video explains the introduction to response spectrum analysis, damping effect, response spectrum generation, different response spectrum types, methods of response spectrum. Comparative study of static and dynamic seismic analysis. However, if the duration of the applied load is short, as in the case of an earthquake, a time history dynamic analysis is required.

The structural analysis of high rise multistory storey reinforced concrete symmetrical and asymmetrical frame building is done with the help of sap software. Besides, food and clothing, shelter is a basic human need. Responsespectrum analysis provides insight into dynamic behavior by measuring pseudospectral acceleration, velocity, or displacement as a function of. What is difference between time history analysis and. For the purpose of seismic analysis, the design spectrum given in figure 1 of is. To those familiar with the indian seismic code of is. Chapter 6 seismic design washington state department of. All design against seismic loads must consider the dynamic nature of the load. Comparative study of static and dynamic seismic analysis of a multistoried building. However, none of the above literature explains appropriate software method for seismic analysis. Maximum stress versus extracted loads caesar ii help. Nov 03, 2018 this video explains the introduction to response spectrum analysis, damping effect, response spectrum generation, different response spectrum types, methods of response spectrum, missing mass. Gupta, response spectrum method in seismic analysis and design of structures, crc press, 1990.

A comparative analysis on absolute and srss methods of response spectrum using staadpro written by a. In fact, the use of the response spectrum method and other simplified static methods appears to have increased and the use of the more accurate timehistory analysis methods has been reduced during the past several years. For seismic resistant design of structures, only these maximum stressesareofinterest,notthetimehistoryofstresses. They are the modal response spectrum analysis method and the equivalent torque method. Other readers will always be interested in your opinion of the books youve read. Chapter 6 seismic design page 62 geotechnical design manual m 4603. Mar 25, 2010 while numerous books have been written on earthquakes, earthquake resistance design, and seismic analysis and design of structures, none have been tailored for advanced students and practitioners, and those who would like to have most of the important aspects of seismic analysis in one place. This video highlights the basic procedure to perform the response spectrum analysis. The results of two groups of structures demonstrated graphically in terms of the ratio of uncoupled lateral.

Response spectrum method in seismic analysis and design of structures. The equivalence is restricted to a single mode of vibration. Unfortunately, the use of more accurate analysis methods has not occurred. A comparative analysis on absolute and srss methods of. Highrise building, response spectrum method, seismic analysis, story deflection, time period, lateral load resisting system, storey drift. Response spectrum method of analysis shall be performed using the design spectrum specified in clause 6. Sap2000 seismic analysis civil engineering community. Response spectrum method of analysis with simplified. Dynamic analysis using response spectrum seismic loading before the existence of inexpensive personal computers, the response.

Response spectra as a useful design and analysis tool for. Dattadepartment of civil engineering, iit delhiresponse spectrum method of analysis the first step is the dynamic analysis while, thesecond step is a static analysis. Equivalent lateral force for an earthquake is defined as a set of lateral force which will produce the same peak response as that obtained by dynamic analysis of structures. Response spectrum analysis of asymmetrical building ijssbt. Abstract this project is concerned with the study of seismic analysis and design of highrise building. This is to certify that the project entitled seismic analysis of high rise building by response spectrum method submitted by ms. For seismic resistant design of structures, only these maximum. Lecture09 introduction to earthquake resistant analysis.

In order to account for correlations between modal responses and between support motions, an extension of the conventional floor response spectrum, denoted. Pdf seismic analysis and design of shear walls in response. Pdf response spectrum analysis of structures subjected to. Certificate this is to certify that the project entitled seismic analysis of high rise building by response spectrum method submitted by ms. This spectrum is based on strong motion records of eight indian earthquakes. Qaisarali civil engineering department uet peshawar. Methods of analysis for earthquake resistant structures is 1893 part1 2002.

In order to perform the seismic analysis and design of a structure to be built at a particular location, the actual time. Datta while numerous books have been written on earthquakes, earthquake resistance design, and seismic analysis and design of structures, none have been tailored for advanced students and practitioners, and those who would like to have most of the important aspects of seismic analysis in one place. Comparative study of static and dynamic seismic analysis of a. Importance of the structure basis of seismic coefficient method. Response spectrum method in seismic analysis and design of structures new directions in civil engineering ajaya kumar gupta on.