Bolted Moment Connection - Limit StatateDescripción completa
10.23.2 Modeling Bolted Connections
Eccentric Footing Dimensioning
Calculation for ASME Bolted Flange
Bolted Connection in Glass StructureFull description
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Bolted Connection in Glass StructureFull description
Full description
Design of eccentric loaded column using Tedds. Procedure results.
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Lecture 16 – Bolted Connections (cont.) Sheet Music
In the previous lecture, we looked at general strength considerations of bolted connections. In this lecture we we will look at a typical all-bolted beam-to-girder shear connection to see practical bolted connection considerations. K
Beam
Cope Lev S S
Girder Connection angles Angle gage gage “g” from from AISC p. 1-46 = Leh where: Cope = cut distance of beam flange necessary to clear girder flange and “K” distance, usually 1½”, 2” or 3” K = distance between top of flange to edge of start of flat web = from beam properties AISC Part 1 Lev = required minimum vertical edge distance in direction of load = from AISC Table J3.4 p. 16.1-107
S = bolt center-to-center spacing from AISC J3.3 p. 16.1-106 Sign up to vote on this title = 2⅔ times nominal bolt diameter Useful Not useful (minimum) = 3 times bolt diameter (preferred) = 3” (typical for bolts up to 1” diameter)
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Example 1 (LRFD) GIVEN: A W16x40 A992 steel beam “A” frames into a W18x55 A992 steel girde “B”. The applied floor Service DL = 80 PSF and the applied floor Service LL = 100 PSF. Use ¾” diameter A325-X bolts with standard bolt holes and doubleangle A36 L3x3x¼ connection angles. The beam is coped at top flange only. REQUIRED: Design the all-bolted beam-to-girder connection and provide a summary sketch.
2 1.6 KLF (30'−0"Sign ) up to vote on this title 2
= 24 KIPS
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Step 2 – Use AISC Table 10-1 “All-Bolted Double-Angle Double-Angle Connections”, p. 10-22:
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These tables incorporate all design considerations for typical allbolted double-angle connections.
¾” Bolts
See Step 3 See Step 9 W16x40 Beam
See Step 5
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Step 3 – Check Bolt and Angle Available Strength: Sheet Music
From Table above, ASTM A325 A325
Bolt and angle available strength = 76.4 KIPS > 24 KIPS
Thread Cond. = X Angle thickness thickness = ¼”
Step 4 – Determine minimum required cope:
The minimum required vertical edge distance must be greater than the “K” distance for either the girder or the beam. W18x55 girder “K det” = 1
5 16
" from AISC p. 1-18
Use co
W16x40 beam “K det” = 1
3 16
" from AISC p. 1-20
Step 5 – Determine vertical edge distance, L ev:
For compactness, use Lev = 1¼” (See Table J3.4 p. 16.1-107) Step 6 – Determine angle gage for L3x3x¼ = L eh:
From AISC p. 1-46 → g1 = Leh = 1¾”
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Step 7 – Check Beam Web Available Strength: Useful Not useful
From Table above,
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Step 8 – Check girder Support Available Strength: Sheet Music
From Table above, Support Available Strength per Inch Thickness = 526 KIPS
The web thickness, t w of a W18x55 = 0.390” from AISC p. 1-18 W18x55 web available strength = 0.390”(526 KIPS/inch) = 205 KIPS > 24 KIPS → OK Step 9 – Determine bolt spacing S:
Preferred bolt spacing S = 3 x bolt diameter = 3(¾”) = 2¼” Use S = 3” from Table above > 2¼”
OK
Step 10 – Draw summary sketch of connection design:
W16x40 Beam
Cope Cope = 1½” 1½” Lev = 1¼” S = 3”
W18x55 Girder
S = 3” 1¼”Sign up to vote on this title
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2 - L 3x3x¼ x 8½” long A36
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Eccentric Loading on Bolt Groups Sheet Music
It is conceivable that a beam has an eccentric loading that acts on a group of bolts in a non-uniform manner. This type of loading is typical in industrial applications with crane rails attached to columns as shown in the picture below:
The loads on the bolts take the following pattern: Load “P” Eccentricity “e”
Load “P” Sign up to vote on this title
Eccentricity “e” Useful Not useful f
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It is difficult to quantify the individual bolt forces, “f” for a particular eccentric bolt loading. Luckily, AISC Tables 7-7 thru 7-14 are available to determine adequacy of eccentrically-loaded bolt groups. Example 2 (ASD) GIVEN: A column is loaded with an eccentric service load as shown below. Assume the the bolts are are A325X. A325X. REQUIRED: Determine the minimum bolt diameter using ASTM A325X bolts.
