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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Regarding the number of modes, in para. Equipment Inspection Method and Weibull Analysis. He provides the following recommendations page There is no specific provisions regarding combination of spatial components, except that in letter f of Section 2. Also, the structural design optimizations were conducted for the four different initial design variable sets to confirm robustness of the optimization algorithm used.

As an alternative the SRSS rule can be used. Labor Omnia Vicit Improbus. The periodic response corresponds to the transient phase in theory of vibrations. The maximum value is 1.

Simply shifting the starting time of a given accelerogram does not constitute the establishment of a different accelerogram.

The EC definition is more conservative than R. Figure 1 shows the typical conceptual shape of znalysis response spectrum in terms of velocity as a function of frequency ref. The periodic modal responses of an earthquake are combined with the following rules: Severe earthquake can bring serious problems in the wind turbines and eventually lead to an interruption to their electric power supply. If uncoupled response of the structure is expected, then znalysis one time history is required.


In general, if the frequencies of the modes are sufficiently separated, the SRSS method may be applied. Thus the structural design optimization of a small vertical-axis wind turbine could be successfully accomplished.

Seismic effects combination | Studio Alicino

The directional effects of an earthquake are combined with the following rules: 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.

Sviluppato con Drupal da Gmg Net Srl. This statement is supported referring to a detailed discussion on this issue developed by Menun and Der Kiureghian in and Analywis to this book, this approach introduces a maximum error of 4. The combination of the effects of the seismic components is discussed in paragraph 4.

The percentage rule is also proposed in paragraph 4. This condition is equivalent to the one adopted by R. No other rules are specified for non-building structures dealt with in Chapter Figure 2 shows the typical response spectrum in terms of acceleration as a function of frequency ref. The combination rule to be used for individual modal responses depends upon whether the responses are periodic, rigid or both see R.

In general, this alternative method is slightly conservative for most cases and is quite adequate since its degree of conservatism is relatively small.

This subject is dealt with in several standards or regulatory guides among which the following are examined herein below: The rigid responses and rigid components of responses are combined algebraically. As a result, all the optimization results for the 4 different replcaement designs showed good agreement with each other properly.


According to ECparagraph 4. For what regard the mode combination, paragraph The percentage rule was srrss forward by Newmark and Rosenblueth first. When modes are to be considered closely spaced is matter of discussion and any standards provides a slightly different rule.

The effects of each modes for a given direction of the seismic action shall be combined with the CQC rule see para. In seismic response analysis two types of combinations are to be considered: There is no specific requirement.

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World Journal of Engineering and TechnologyVol. The equations are written as follows: Scientific Research An Academic Publisher.

The percentage rule is therefore adopted. Recently, there is a growing interest in seismic qualification of ridges, buildings and mechanical equipment worldwide due to increase of accidents caused by earthquake.

Seismic effects combination

Subscribing you accept the TOC. 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. To overcome and ahalysis these undesirable problems, structural design optimization of a small vertical axis fkr 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.