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RE: IDR

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Thank you for your response:

What are MCE and MPE and where can I get the Tri-service manual.

I have considered the push over analysis, we have the budget but not the
time, very fast track design schedule.

Thank You

Tom Long
Asia

	-----Original Message-----
	From:	Tom Chiu [SMTP:Tomchiu(--nospam--at)worldnet.att.net]
	Sent:	21 January 1998 07:31
	To:	seaoc(--nospam--at)seaoc.org
	Subject:	Re: IDR

	You should do it both ways:

	1.  Scale the dynamic analysis results by the factor of UBC base
	shear/Dynamic base shear and do a Code level stress check.

	2.  Calculate the Dynamic demand/capacity ratios of the members
and
	compare them to acceptable D/C factors for various level of
earthquakes,
	such as MCE, MPE etc. Tri-service manual has a list of
acceptable D/C
	factors that you can use for reference.

	3.  If you have enough budget, you can also go a step further to
do a
	Push-over analysis to find out the inelastic responses of the
structure,
	to see if there is a collapse potential or not.


	Good luck,
	Tom Chiu, SE

	Tom Long wrote:
	> 
	> We are designing a new 5 level airport in Manila, 188,000 m2.
The type
	> of construction is concrete flat plate slab with drop panels.
We are
	> using SAP2000 to analyze the structure.  After we perform the
analysis
	> and get the seismic forces from the response spectra analysis,
should we
	> apply an IDR to reduce the forces before we compare them with
the
	> capacity of the elements, or should we compare the d/c ratio
to a
	> acceptable factor for the type of structure.
	> 
	> Or in another case should we follow the UBC and just scale the
results
	> from the dynamic analysis.
	> 
	> Thank you
	> 
	> Best regards,
	> Tom Long
	> Asia
	>