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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Recently, there is a growing interest in seismic qualification of ridges, buildings and mechanical equipment worldwide due to increase of accidents caused by earthquake.
This statement is supported referring to a detailed discussion on this issue developed by Menun and Der Kiureghian selsmic and This subject is dealt with in several standards or regulatory guides among which the following are examined herein below: According to this book, this approach introduces a maximum error of 4.
The percentage rule was put forward by Newmark and Rosenblueth first.
A Replacement for the SRSS Method in Seismic Analysis – Edward L. Wilson – Google Books
There is no specific requirement. Severe earthquake can bring serious problems in the wind turbines and eventually lead to an interruption to their electric power supply. The combination of the effects of the seismic components is discussed in paragraph 4.
Labor Omnia Vicit Improbus. Also, the structural design optimizations were conducted for the four different initial design variable sets to confirm robustness of the optimization algorithm used.
Scientific Research An Academic Publisher. Equipment Inspection Method and Weibull Analysis.
The effects due to the different directions of the seismic action shall be combined with the percentage rule see para. If uncoupled response of the structure is expected, then only one time history is required.
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: The equations are written as follows: Figure 1 shows the typical conceptual shape of a response spectrum in terms of velocity as a function of frequency ref. He provides the following recommendations page 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.
For response spectrum RS analysis, the R. Subscribing you accept the TOC. Thus the structural design optimization of a small vertical-axis wind turbine could be successfully accomplished. The percentage rule is also proposed in paragraph 4. No other rules are specified for non-building structures dealt with in Chapter Regarding the number of modes, in para.
The combination rule to be used for individual modal responses depends upon whether the responses are periodic, rigid or both see R.
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As mentioned by Gupta in ref. 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.
Sviluppato con Drupal da Gmg Net Srl. The EC definition is more conservative than R. The maximum value is 1. World Journal of Engineering and TechnologyVol.
Seismic effects combination
The dotted lines refer to the case of multiple narrow-banded response spectrum with two or more peaks of acceleration. The percentage rule is therefore adopted. Both periodic and rigid responses occur in the intermediate region between amplified spectral acceleration and high-frequency region DE in Figure 1 and Figure 2. The directional effects of an earthquake are combined with the following rules: According to ECparagraph 4.
Periodic responses are dominant in the region of amplified spectral displacement, amplified spectral velocity and amplified spectral acceleration. The periodic response replaccement to the transient phase in theory of vibrations.
Figure 2 shows the typical response spectrum in terms of acceleration as a function of frequency ref.