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tank design-new api650 11th- equake check
i try to do the earthquake of a tank based on a new standard api650 11th edition. it's a lot different from the old standard.
i have a problem to understand the unit of spectral accerlaration parameter.
for example, "so" is the acceleration parameter at 0 second period, %g . it's meant that "so" is the max value =2.5 or 2.5g or 0.25 ???? ( g=9.81 m2/s)> say that earthquake in australia
thanks.

check out our whitepaper library.
units for so, s1, s-ds, etc, are given as a percent of gravitational force. in the seismic maps of asce 7-05 (which of course doesn't include australia), the map will show lines for 10, 15, etc., which are 10%, 15% etc. of gravitational force, and used in the calculations as 0.10, 0.15, etc.
if you are given a value of so = 2.5, i would take that as 250% of gravitational acceleration or 2.5g, which is very high seismic loading.
there are some typos in the 11th edition, also. for example, eq. e.6.1.1-3 should have a wp after it.

2009-09-16, 12:43 PM	#1
huangyhg 超级版主注册日期: 04-03 帖子: 18592 精华: 36 现金: 249466 标准币资产: 1080358888 标准币	ank design-new api650 11th- equake check tank design-new api650 11th- equake check i try to do the earthquake of a tank based on a new standard api650 11th edition. it's a lot different from the old standard. i have a problem to understand the unit of spectral accerlaration parameter. for example, "so" is the acceleration parameter at 0 second period, %g . it's meant that "so" is the max value =2.5 or 2.5g or 0.25 ???? ( g=9.81 m2/s)> say that earthquake in australia thanks. check out our whitepaper library. units for so, s1, s-ds, etc, are given as a percent of gravitational force. in the seismic maps of asce 7-05 (which of course doesn't include australia), the map will show lines for 10, 15, etc., which are 10%, 15% etc. of gravitational force, and used in the calculations as 0.10, 0.15, etc. if you are given a value of so = 2.5, i would take that as 250% of gravitational acceleration or 2.5g, which is very high seismic loading. there are some typos in the 11th edition, also. for example, eq. e.6.1.1-3 should have a wp after it. __________________ 借用达朗贝尔的名言：前进吧，你会得到信心! [url="http://www.dimcax.com"]几何尺寸与公差标准[/url]