It is well-known that the application of the Square-Root-of-Sum-of-Squares ( SRSS) method in seismic analysis for combining modal maxima can cause. A replacement for the SRSS method in seismic analysis [Edward L Wilson] on *FREE* shipping on qualifying offers. A Replacement for the SRSS Method in Seismic Analysis. Front Cover. Edward L. Wilson. Wiley, – Structural analysis (Engineering).

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The equations are written as follows: 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 According to this book, this approach introduces a maximum error of 4.

A Replacement for the SRSS Method in Seismic Analysis – Edward L. Wilson – Google Books

Thus the structural design optimization of a small vertical-axis wind turbine could be successfully accomplished. Regarding the number of modes, in para. For what regard the mode combination, paragraph For response spectrum RS analysis, the R. Labor Omnia Vicit Improbus. In general, this alternative method is slightly conservative for most cases and is quite adequate since its degree of conservatism is relatively small.

As mentioned by Gupta in ref. The periodic response corresponds to the transient phase in theory of vibrations. There is no specific requirement.


Seismic effects combination

As an alternative the SRSS rule can be used. Sviluppato con Drupal da Gmg Net Srl. Also, the structural design optimizations were conducted for the four different initial design variable sets to confirm robustness of the optimization algorithm used. Equipment Inspection Method and Weibull Analysis.

To overcome and prevent these undesirable problems, structural design optimization of a small vertical axis wind turbine has performed, in this study, for seismic qualification and lightweight by using a Genetic Algorithm GA subject to some design constraints such as the maximum stress limit, maximum deformation limit, and seismic acceleration gain limit.

There is no specific provisions regarding metuod of spatial components, except that in letter f of Section 2.

The EC definition is more conservative than R. He provides the following recommendations page Scientific Research An Academic Publisher.

The periodic modal responses of an earthquake are combined with the following rules: The maximum value is 1. Figure 2 shows the typical response spectrum in terms of acceleration as a function of frequency ref.

The effects due to the different directions of the seismic action shall be combined with the percentage rule see analysos.

The percentage method is never srxs cited, but the theoretical bases for it are provided in Chapter 4, where the superposition of the i-modes is provided as linear combination with coefficients C i that have different values for different modes but can be approximated by the value 0.


World Journal of Engineering and TechnologyVol. The rigid responses and rigid components of responses are combined algebraically.

Then, the seismic analysis for each direction can be performed separately and then combined by the square root of the sum of the squares SRSS.

The percentage rule is also proposed in paragraph 4. The combination rule to be used for individual modal responses depends upon whether the responses are periodic, rigid or both see R. Subscribing you accept the TOC. Sensitivity Analysis of the Replacement Problem.

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This paper offers also page 49 a short discussion of the directional combination procedure: The percentage rule is therefore adopted. In seismic response analysis two types of i are to be considered: In general, if the frequencies of the modes are sufficiently separated, the SRSS method may be applied.

Periodic responses are dominant in the region of amplified spectral displacement, amplified spectral velocity and amplified spectral acceleration. SRSS3 method would have a rather large error if the natural periods of analysix structure are close to each other, namely modal correlation coefficients of structure are large.

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