I've been tasked with designing a foundation system for a 60' tall, 50,000 gallon ground-support tank used for liquid storage. My firm has had a older 'rule of thumb' reference on tank seismic design from IBC 2000. However, looking through ASCE 7-10's seismic requirements, it would seem section 15.7.6 would be the appropriate method to use in finding the seismic base shear for the tank. I've yet to find a good design example for ASCE 7-10 Ch. 15, if anyone could point me to one? But I have specific questions as well: 1.
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How is W c (portion of liquid weight sloshing) calculated? Is this provided from the tank manufacturer typically?
Further, are there any approximate methods out there? Is T L the same as it would be for typical buildings? Using Figure 22-12) 3. At what elevations are the impulsive and convective base shears applied? I imagine the convective effects would occur at a higher elevation than the typical impulsive effects? I would appreciate input on any of these questions. RE: ASCE 7-10 Chapter 15 Seismic Loading on Tanks (Structural) 13 Jul 15 20:17.
The impulsive and convective portions of the contents, and the heights at which they are applied, will generally come from the tank design codes- API-650, AWWA D100, etc. That should also be part of the calculations done by the tank manufacturer, although it would quite commonly get figured by both parties. Adobe font folio 11.1 download. The T-L is the same as for buildings (IE, it's not a building property, it's a ground-movement property). Generally, the approach will be to do all the calculations per API or AWWA, then check for any adjustments required by ASCE 7.
RE: ASCE 7-10 Chapter 15 Seismic Loading on Tanks (Structural) 13 Jul 15 23:54. There are two tank design methodologies that ASCE7 Chapter 15 refers back to: API-650 (mostly used for welded steel tanks found in tank farms) AWWA D100 (water tanks of any material and occasionally elevated up on stands) I've only anchored tanks per AWWA D100 but if you can get your hands on it it has all the equations to determine the sloshing and impulsive force as well as the height of the force application.
The terms include a lot of hyperbolic sine and cosine terms if I recall. But it's a prescriptive process. The overturning values per AWWA are a little better (as in less conservative) than those found by simply treating the tank as a rigid mass per the Chapter 15 simplified approach. RE: ASCE 7-10 Chapter 15 Seismic Loading on Tanks (Structural) 14 Jul 15 00:25. All, thanks for the references.
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I will look into getting a copy of API-650 and AWWA D100, as suggested. We actually have a copy of ACI350.3-06, which seems to present the same dynamic model that ASCE 7-10 is using (Housner 1963). If I'm analyzing a steel tank, are ACI350.3 equations for Tc, Wc, etc. Still applicable considering it was written for concrete structures? In other words, do those equations apply to 'flexible' structures as they do 'rigid' concrete structures?
RE: ASCE 7-10 Chapter 15 Seismic Loading on Tanks (Structural) 28 Oct 15 22:38.
Load Combinations: ASCE 7-10 LRFD In the United States, ASCE 7-10 is an key part of the building code. It focuses on the requirements for general structural design, as well as providing a means for determining loads (dead, live, soil, flood, snow, rain, ice, earthquake, wind) and their combinations.
Load and Resistance Factor Design (LRFD) involves seven basic load combination equations. This article will focus on how auto generated load combinations feature meets the load combination equations as specified in ASCE 7-10 LRFD. 2.3.2 Basic Combinations Design Code Equation Design Code Comment SkyCiv Equation SkyCiv Comment 1.4D Eq. 2.3.2.1 1.4G - 1.2D + 1.6L + 0.5(Lr r or S or R) Eq. 2.3.2.2 1.2G + 1.6Q L + 0.5Q S The load type 'Snow' is sub-categorized into 'snow', 'roof live', and 'rain'. Selecting this load combination will automatically create 3 load combination equations due to the use of 'or' in the equation specification.
1.2D + 1.6(Lr r or S or R) + (L or 0.5W) Eq. 2.3.2.3 1.2G + 1.6Q S + Q L 1.2G + 1.6Q S + 0.5Q W Due to the presence of 'or' in two places of this load combination, this generates 6 load equations. SkyCiv has separated this into two load combinations (for the L or 0.5W options) which generates 3 load equations each. 1.2D + 1.0W + L + 0.5(L r or S or R) Eq. 2.3.2.4 1.2G + Q W + Q L + 0.5Q S The load type 'Snow' is sub-categorized into 'snow', 'roof live', and 'rain'. Selecting this load combination will automatically create 3 load combination equations due to the use of 'or' in the equation specification. 1.2D + 1.0E + L + 0.2S Eq.
2.3.2.5 1.2G + Q L + 0.2Q S + E - 0.9D + 1.0W Eq. 2.3.2.6 0.9G + Q W - 0.9D + 1.0E Eq. 2.3.2.7 0.9G + E - Example: All Load Types Assigned Whilst not practical, 7 load groups have been created and assigned to all 7 load types as seen below. This is done to check the equations that are formed from the load combinations The results from the datasheet are shown below.
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