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Subject: Calculations of Base Shear
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- Subject: Subject: Calculations of Base Shear
- From: Mark Gilligan <MarkKGilligan(--nospam--at)compuserve.com>
- Date: Mon, 24 Feb 2003 17:09:42 -0500
Bobby There are two approaches: In both approaches you must consider all building weight above that is tributary to the level above the found floor when calculating the total base shear. When distributing the forces to the shear walls you can ignore the weight of the shear walls at that level when the shear walls are parallel to the direction of the earthquake motion. This ignored weight times the proper coefficient should then be applied directly to the shear wall. This can be worthwhile if you have a particularly heavy wall or when you want the absolute minimum force in the diaphragm. This is more difficult when you are using a computer program to analyze the structure as opposed to a hand analysis. The more common approach is to assume all of the wall weight tributary to the diaphragm is lumped together. This is quickier and less prone to mistakes. Mark Gilligan ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Greetings and Salutations: I have managed to get myself confused as I attempt to determine the weight of the structure for base shear calculations. When determining the weight of a structure for base shear, I understand that the weight for the floor or roof system along with the tributary weight of the walls is "lumped" at each level. When making this calculation, is the direction of the earthquake force considered? That is, do I include the weight of vertical elements parallel to the direction of the earthquake force considered? I have seen discussion elsewhere that indicated wall weight parallel to the EQ force was not included in the base shear calculation and I have seen examples where the total values were determined without regard to force direction - that is - the earthquake force was the same in each direction of the structural system. What is correct? Thanks in advance! Bobby Jenkins, PE Jenkins Engineering, Inc. PO Box 2101 218 S Thomas St Suite 209 Tupelo, MS 38803 (662) 840.1233 vocal (662) 840.1103 fax E-Mail: jei(--nospam--at)netbci.com ******* ****** ******* ******** ******* ******* ******* *** * 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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