【Daily Question】【Static Equipment AC Version...Question 123】July 22, 2019 Multiple-choice...Fill-in-the-blank

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bg4.png【Daily Question】【AC Version for Static Equipment...Question 123】 July 22, 2019 Multiple-choice questions...Fill-in-the-blank questions...........................................................................Reward rules: 3 Wealth points for participation, 10 Wealth points for correct answers. No scoring will be given after two days, except during holidays. ...........................................................................a. According to the specifications for towers, when calculating the natural vibration period, if the thickness of the tower shell and the skirt shell is increased, the natural vibration period of the tower will change ( ). b. The spherical tank can be regarded as a ( ) system, for which the basic natural vibration period is calculated. . ...........................................................................Comment: This tests the designer’s understanding of the relationship between natural frequency period and wall thickness. In addition to using computer software correctly, designers must also be thoroughly familiar with the basic principles and rules. In particular, reviewers should use these principles and rules to evaluate the calculation results and make appropriate adjustments to the parameters. Comment: Calculation models for spherical tanks under seismic and wind loads. Answer: According to the regulations for towers, when calculating the natural frequency period, increasing the thickness of the tower shell and the skirt shell will result in a (smaller) natural frequency period for that tower. A spherical tank can be regarded as a (single-point) system, for which the fundamental natural vibration period is calculated.