A significant change in the correlation of the motions between the two s. As the maximum difference between the spectral analysis and psdf based response spectrum method is 15%, the difference between the spectral analysis and response spectrum method is 125%. A spectralrepresentation based algorithm is used to generate response spectrum compatible time histories at different support points of the dam. A formulation is developed for analyzing the dynamic response of multisupport structures with coupled nonclassical damping using spectral moments instead of the frequently used crosscorrelation coefficients. Ucbeerc9109 a preliminary study on energy dissipating claddingtoframe connections, cohen, julie mark.
Numerical simulation on seismic behavior of a bridge under multi support excitations considering site effect to cite this article. Effect of multi support excitation on seismic response of. Based on the pseudoexcitation algorithm, a response spectrum method for multisupport seismic excitations is presented, where, the structural response consist of three components, ie. However, no rsm is presented in details for the seismic design of underground structures due to the complexity of seismic soilstructure interaction ssi. The advantage of the method is that the linear peak seismic response of the arch to multisupport excitations can be obtained as conveniently as the conventional response spectrum method does.
Influence of apparent wave velocity on seismic performance of. Seismic response analysis of longspan structures under multi support excitations has been the subject of extensive investigations during the past decades. Ucbeerc9107 estimation of seismic source processes using strong motion array data, chiou, brian s. The efficiency comes from the dramatic reduction in formation time and the degrees of freedom dof associated with the structure, using the integrated finite strip method ifsm along with the application of a very robust and efficient time history method thm using the newmark. A corrected earthquake power spectral density model is first proposed and applied to the following solution process. In this paper, the rsm is developed for the seismic analysis of the underground structures including ssi. Influence of apparent wave velocity on seismic performance. As one of the main characteristics of seismic waves, apparent wave velocity has great influence on seismic responses of longspan suspension bridges.
This paper provides a very efficient, integrated framework for seismic analyses of longspan cablestayed bridges. Soyluk, comparison of random vibration methods for multi support seismic. Analysis method for the response of structures subjected to. An efficient approach for seismic analysis of multi. The response spectrum method causes much larger bending moments than those of the former two methods.
A simplified multisupport response spectrum method springerlink. Understanding these influences is important for seismic design. This new textbook examines the wealth of information on the response spectrum method generated by the latest research and presents the background theory in. May 22, 2017 once the displacement timehistory record is obtained from an acceleration record, ground motion may be applied to specific support restraints through manual multi support excitation, described as follows. Pdf loaddependent ritz ldr vectors are used in conjunction with. Earthquake engineering and structural dynamics, 1992, 218. Seismic response and design method of single large span. Its advantages are that the formulation considering the modal response variances and crosscovariances is more efficient in calculation than the conventional formulation, and the. Approximate modal response spectrum method of analysis. Numerical simulation on seismic behavior of a bridge under multisupport excitations considering site effect to cite this article. The earthquake engineering online archive nisee elibrary.
The seismic spectral response of structures can be expressed based on several correlation coefficients and the time consumption can be greatly reduced if the coefficients are expressed in closedform. In this paper,the general analytic solutions of the responses of the fixed end arch,2hinged arch and 3hinged arch to the multisupport seismic ex citations are derived,considering the arches as the nonorthogonal barsystems. In this article, the critical issues concerning the. Pdf response spectrum method in seismic analysis and. Error study of displacement model for seismic analysis of. Dynamic responses of bridges under effects of asynchronous. Spatial variation of earthquake ground motion is an important phenomenon that cannot be ignored in the design and safety of strategic structures. Mar 03, 2016 this paper provides a very efficient, integrated framework for seismic analyses of longspan cablestayed bridges. This paper proposes a response spectrum method rsm for evaluating nonlinear. An efficient response spectrum analysis of structures under multi.
Ab stands for the modulus of the coherence function. Response spectrum method for multisupport seismic excitation, earthquake eng. The response spectrum method of analysis is developed using the following steps. Seismic analysis of longspan cablestayed bridges by an. Spectrum method for multisupport seismic excitations, earthquake. A simplified multisupport response spectrum method request pdf. Based on the random vibration theory, a response spectrum method is developed for seismic response analysis of linear, multidegreeoffreedom structures under multisupport excitations is developed. Comparison of some code provisions prescribed by different earthquake codes. The support motions are taken to be a vector of jointly stationary gaussian random 1. With this book, readers will gain proficiencies in the following. The frequently used dynamic analysis method is adopted in this. However, almost all the procedures for the evaluation of variation assumed that the random field is homogeneous in space. An efficient approach for seismic analysis of multisupport.
Jun 17, 2019 the response spectrum method rsm has been incorporated into many codes for seismic design of aboveground structures since 1950s. Sep 10, 20 the response spectrum method of analysis is developed using the following steps. A response spectrum method is proposed for the seismic. The second source depends directly upon the ratio of the longest structural dimension to the shortest significant wavelength. The new response spectrum method is shown to offer a simple and viable alternative for seismic analysis of multiply supported structures subjected to spatially varying ground motions. Multiple support excitations of elastic multispan beams are studied. A new response spectrum method is developed for seismic analysis of linear multi. The method is particularly effective when a comprehensive understanding of the spatial variability effect.
Active tendon control systems for structures subjected to. Based on the staticg method which did not account for differ ences in. Spatial seismic excitations and response spectra zbigniew zembaty opole university of technology 45271 opole ul. Variations of the ground motion due to wave passage, loss of coherency with distance and variation of local soil conditions are included. The good agreement of results between the timehistory method and the average response spectrum method shows the validity of the latter method. Based on the random vibration theory, a response spectrum method is developed for seismic response analysis of linear, multi degreeoffreedom structures under multi support excitations is developed. Analysis method for the response of structures subjected. 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. Response spectrum method for multisupport seismic excitations, earthquake. The seismic spectral computation of structures is timeconsuming under multiple support excitations. For example, several response spectrum method have been developed by different researchers to calculate the seismic response of. Manual multisupport excitation technical knowledge base.
This load pattern should apply unit values of joint displacement in the direction of applied acceleration. Influence of incoherence and wave passage effects on. Provides comprehensive coverage, from seismology to seismic control contains useful empirical equations often required in the seismic analysis of structures outlines explicit steps for seismic analysis of mdof systems with multi support excitations works through solved problems to illustrate different concepts makes use of matlab, sap2000 and. Generation of spatially varying ground motion based on. Zerva, effect of spatial variability and propagation of seismic ground motions on the response of multiply supported structures, probabilistic engineering mechanics,6, 212221 1991. Neuenhofer 1992 also proposed a concept of random vibrationbased response spectrum method for. Multitower suspension bridge is of different style compared to the traditional suspension bridge with two towers, and consequently the dissimilarity of static and dynamic behaviors is distinct. Summary a new response spectrum method is developed for seismic analysis of linear multidegreeoffreedom.
Multiplesupport seismic response of bosporus suspension bridge. A simplified multisupport response spectrum method. The response spectrum method rsm has been incorporated into many codes for seismic design of aboveground structures since 1950s. Seismic response study on a multispan cablestayed bridge. Influence of incoherence and wave passage effects on seismic performances of long immersed tunnel. This load pattern should apply unit values of joint displacement in the direction of applied.
In this paper, the rsm is developed for the seismic analysis of the underground structures. How to investigate the inhomogeneous feature of ground. Seismic response of longspan tripletower suspension bridge. Seismic response analysis of longspan structures under multisupport excitations has been the subject of extensive investigations during the past decades. Using the acceleration response spectrum, an equivalent static load is derived which will provide the same maximum response as that obtained in each. A new response spectrum method is developed for seismic analysis of linear multi degreeoffreedom. The timehistory responses of a set of fixedend arches rigid or medium rigid structures are calculated,according to two sets of multipoint records of medi um. Analysis of seismic response cannot be based on the single assumption that freefield ground motions are spatially uniform. As a special case of multitower suspension bridge, two longspan tripletower suspension bridges have been constructed in china and the seismic random response of tripletower suspension bridges is. Structures, such as bridges, pipelines which are supported at multiple places, will be subjected to differential excitation. Response spectrum method in seismic analysis and design of structures article pdf available in bulletin of the new zealand society for earthquake engineering 263. The structural response is a sum of two components of a structure with a first natural period less than 2 s. Global parametric sensitivity analysis of a complete seismic risk scenario is performed by means of the response surface method based on sparse chebyshev polynomial expansion.
The advantage of the method is that the linear peak seismic response of the arch to multi support excitations can be obtained as conveniently as the conventional response spectrum method does. Comparison of random vibration methods for multisupport. Seismic response of longspan tripletower suspension. The first component is the pseudostatic response caused by the inconsistent motions of the structural supports, and the second is the structural dynamic response to ground. A method for nonstationary earthquake responses of suspension bridges was presented by multiple support excitations 5. A fast simulation method was developed in the current study. A significant change in the correlation of the motions between the two supports is due to the combined effects of wave passage, coherency loss and local soil conditions. Response spectrum method for multisupport seismic excitations. A response spectrum method for multiplesupport seismic.
Response spectrum method for multi support seismic excitations j. Once the displacement timehistory record is obtained from an acceleration record, ground motion may be applied to specific support restraints through manual multisupport excitation, described as follows at joints of interest, define a load pattern. This article aims at studying the seismic response rules and design method of single large span structures to spatially varying ground motions. Response spectrum method of analysis seismic analysis of. Analysis of cablestayed bridges under multicomponent random ground motion by response spectrum method. Hazard model, described via a mixed technique combining greens function and stochastic methods, is used to simulate freefield seismic records. Therefore, the structural response under nonstationary seismic excitation requires further study.
Paper open access numerical simulation on seismic behavior of. Sensitivity analysis of a seismic risk scenario using. Pdf multiplesupport response spectrum analysis using load. Response spectrum method of analysis with simplified. Seismic response analysis for tunnel conveying water under. It is obvious that reality does not fully conform to the assumption. Summary a new response spectrum method is developed for seismic analysis of linear multidegreeoffreedom,multiply supported structures subjected to spatially varying ground motions. Response spectrum method for seismic soilstructure. Response spectrum method for multi support seismic excitations.
Cascaded analysis of secondary systems using response spectrum method. Seismic analysis of structures subjected to spatially. Concept of equivalent lateral force and response spectrum method of analysis. Pseudo excitation method and some recent developments. Aim at this problem, the paper considers interaction of surrounding rocktunnel liningwater system and considers traveling wave effect. A simplified multisupport response spectrum method is presented. Variations of the ground motion due to wave passage, loss of coherency with distance. Datta department of civil engineering, iit delhi response spectrum method of analysis 0 5 10 15 20 25 30 0. Seismic design for steel trussed arch to multisupport. An efficient approach for seismic analysis of multi support structures equipped with coupled dampers using spectral moments instead of crosscorrelation coefficients. Response spectrum method for multisupport seismic excitations j. An efficient calculation method for seismic spectral analysis. A gridbased method to represent the covariance structure. For largescale waterconveying tunnel, the spatial variation characteristics of earthquake excitation, namely, multipoint input has great effects on seismic response of the waterconveying tunnel.
Wang, implementation of the practical pseudo excitation method for multisupport seismic response analysis in general fem software, journal of earthquake engineering and engineering vibration, vol. Response spectrum method of analysis mechanical engineering. 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. Because of the limitations of the tests data, the principles of seismic performance of multispan cablestayed bridges under multisupport excitations will not be discussed in detail here. Because of the limitations of the tests data, the principles of seismic performance of multi span cablestayed bridges under multi support excitations will not be discussed in detail here. The response spectrum in the case of multisupport excitations then. The spectral method of seismic analysis is based on the formulation of the dynamic response transient by modal recombination presented in the documents methods of ritz in linear and nonlinear dynamics r5.
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