A REPLACEMENT FOR THE SRSS METHOD IN SEISMIC ANALYSIS PDF

Severe earthquake can bring serious problems in the wind turbines and eventually lead to an interruption to their electric power supply. This subject is dealt with in several standards or regulatory guides among which the following are examined herein below: The equations are written as follows: The combination of the effects of the seismic components is discussed in paragraph 4. The percentage rule is also proposed in paragraph 4. The periodic modal responses of an earthquake are combined with the following rules: This paper offers also page 49 a short discussion of the directional combination procedure: Subscribing you accept the TOC. As an alternative the SRSS rule can replacfment used. Periodic responses are dominant in the region of amplified spectral displacement, amplified spectral velocity and amplified spectral acceleration.

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Response spectrum method is favoured by earthquake engineering community because of: Response Spectrum Method of Analysis It provides a technique for performing an equivalent static lateral load analysis. It allows a clear understanding of the contributions of different modes of vibration. It offers a simplified method for finding the design forces for structural members for earthquake.

For seismic design, these maximum stresses are of interest, not the time history of stress. 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. The equivalence is restricted to a single mode of vibration.

The response spectrum method of analysis is developed using the following steps. The first step is the dynamic analysis while , the step is a static analysis.

It ignores the algebraic sign of the response. Actual time history analysis shows modal peaks occur at different times as shown in Fig. Thus, the combination provides a conservative estimate of response. When frequencies are not well separated, some errors are introduced due to the degree of correlation of modal responses which is ignored. The CQC rule called complete quadratic combination rule takes care of this correlation.

Due to the second term, the peak response may be estimated less than that of SRSS.

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A REPLACEMENT FOR THE SRSS METHOD IN SEISMIC ANALYSIS PDF

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Seismic Analysis and Design of Equipment

Response spectrum method is favoured by earthquake engineering community because of: Response Spectrum Method of Analysis It provides a technique for performing an equivalent static lateral load analysis. It allows a clear understanding of the contributions of different modes of vibration. It offers a simplified method for finding the design forces for structural members for earthquake. For seismic design, these maximum stresses are of interest, not the time history of stress.

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The complete SRSS modal combination rule

Dojora The directional effects of an earthquake are combined with the following rules: This statement is supported referring to a detailed discussion on this issue developed by Menun and Der Kiureghian in and Sensitivity Analysis of the Replacement Problem. As mentioned by Gupta in ref. This subject is dealt with in several replscement or regulatory guides among which the following are examined herein below: In seismic response analysis two types of combinations are to be considered: Figure 2 shows the typical response spectrum in terms of acceleration as a function of frequency ref. Sviluppato con Drupal da Gmg Net Srl.

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