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Re: Pier Natural Frequency
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- Subject: Re: Pier Natural Frequency
- From: TJ_Fu(--nospam--at)URSCorp.com
- Date: Tue, 28 Dec 2004 14:08:24 -0500
I have been using the following equations for seismic load application to develop many types of elevated water tank design programs. Natural Frequency, w = SQRT(K / Mass) = SQRT[K / (W/g)] = SQRT(Kg / W) in Radians / sec. Where, K = Spring constant = P / defl. in kips/in (The load that produce a unit deflection at C.G.) g = Acceleration of gravity = 386 in/sec^2 = 32.2 Ft/sec^2 W = Total weight of pier and machine in kips Natural Period, T = 2(pi) / w = 2(pi)SQRT(W / Kg) = 2(pi)SQRT(W / 386 / K) =- 0.32 SQRT(W / K) in seconds / cycle T.J. Fu "Rich Lewis" <sea@lewisenginee To: <seaint(--nospam--at)seaint.org> ring.com> cc: Subject: Pier Natural Frequency 12/28/2004 12:17 AM Please respond to seaint I have a requirement to have a cantilever pier supporting a machine to have a natural frequency greater than 50 Hz. How do you calculate the natural frequency of a cantilever pier? Rich Lewis Lewis Engineering ******* ****** ******* ******** ******* ******* ******* *** * Read list FAQ at: http://www.seaint.org/list_FAQ.asp * * This email was sent to you via Structural Engineers * Association of Southern California (SEAOSC) server. To * subscribe (no fee) or UnSubscribe, please go to: * * http://www.seaint.org/sealist1.asp * * Questions to seaint-ad(--nospam--at)seaint.org. Remember, any email you * send to the list is public domain and may be re-posted * without your permission. Make sure you visit our web * site at: http://www.seaint.org ******* ****** ****** ****** ******* ****** ****** ********
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