A REPLACEMENT FOR THE SRSS METHOD IN SEISMIC ANALYSIS PDF

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.

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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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Seismic Analysis and Design of Equipment

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.

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A replacement for the srss method in seismic analysis

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A REPLACEMENT FOR THE SRSS METHOD IN SEISMIC ANALYSIS PDF

Anil K. Chopra The modal combination rules commonly used in response spectrum analyses implicitly assume that the peak factor associated with the response quantity of interest is equal to the peak factors of the contributing modal responses. In this paper, we examine the validity of this assumption and demonstrate that it causes the modal combination rules to over-represent the contribution of the higher modes of vibration to the total response and under-represent the contribution of the lower modes. Consequently, a response-spectrum-based analysis can yield a biased estimate for the peak value of a response quantity when two or more well-separated modal frequencies make significant contributions to the total response. To correct this potential bias in response-spectrum-based estimates, we develop a procedure for estimating the peak factors that is suitable to the response spectrum analysis calculations commonly used in the current design practice.

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