Double Angle Connection Design per AISC 360-16

How does ideCAD design single angle connection according to AISC 360-16?

Double angle connection limit states and geometry checks are done automatically according to AISC 360-16.

The block shear limit state is checked automatically according to AISC 360-16.

Limit state checks are made automatically according to AISC 360-16, depending on whether the connection type selected by the user is bolted or welded.

Symbols

A_b: Non-threaded bolt web characteristic cross-sectional area
A_g: Gross area
A_n: Net cross-section area
A_e: Effective net cross-sectional area
A_vg: Gross area under shear stress
A_nv: Net area under shear stress
A_nt: Net area under tensile stress
A_w: Cross-section web area
C_v: Coefficient of reduction for shear buckling
d: Characteristic diameter of the stem of the bolt (the diameter of the non-threaded stem of the bolt)
d_h: Bolt hole diameter
F_y: Structural steel characteristic yield strength
F_u: Structural steel characteristic tensile strength
F_yb: Bolt characteristic yield strength
F_ub: Bolt characteristic tensile strength
n_sp: Number of slip planes
s: Distance between bolt-hole centers
L: Connector distance
L_c: The clear distance between bolt holes
L_e: The distance from the center of the bolt hole to the edge of the assembled element
L_eh: The horizontal distance from the center of the bolt hole to the edge of the assembled element
L_ev: The vertical distance from the center of the bolt hole to the edge of the assembled element
t: Plate thickness
R_n: Characteristic strength
R_nt: Characteristic tensile strength
R_nv: Characteristic shear strength
U_bs: A coefficient considering the spread of tensile stresses

Connection Geometry

Geometry Checks

Bolts Spacing

The distance between the centers of bolts is checked per AISC 360-16.

s_min ≥ 3d	AISC 360-16 J3.3
s	79.5 mm
d	20 mm	s =79.5 mm > s_min = 3*20=60 mm	√

Horizontal Edge Distance

The distance from the center of the hole to the edge of the connected part in the horizontal direction is checked per AISC 360-16.

L_eh ≥ L_e-min	AISC 360-16 J3.4
L_eh	50.75 mm	L _eh ≥ 2d = 2 * 20 = 40 mm conformity check for application	√
L_e-min	26 mm	Minimum distance check according to Table J3.4	√

Vertical Edge Distance

The distance from the center of the hole to the edge of the connected part in the vertical direction is checked per AISC 360-16.

L_ev ≥ L_{e- min}	AISC 360-16 J3.4
L_ev	40 mm	L _eh ≥ 2d = 2 * 20 = 40 mm conformity check for application	√
L_{e- min}	26 mm	Minimum distance check according to Table J3.4	√

Weld Size

The minimum size of fillet welds is checked according to AISC 360-16 Table J2.4

a ≥ a _min	AISC 360-16 Table J2.4
a	7.072 mm		√
a_min	5 mm	Table J2.4	√

Erection Stability

L≥ h_b / 2
L	239 mm
h_b	248.6 mm	L=239 > 248.6/2=124.3 mm	√

Strength Checks

Angle Shear Yield

The shear strength of connecting elements in shear is the minimum value obtained according to the limit states of shear yielding and shear rupture. Shear yielding is checked according to AISC 360-16.

A_g
F_y	235.359 N/mm²
R_n		AISC 360-16 J4-3
R_n / Ω

Required	Available	Check	Result
73.288 kN	540 kN	0.136	√

Beam Shear Rupture

The shear strength of connecting elements in shear is the minimum value obtained according to the limit states of shear yielding and shear rupture. Shear rupture is checked according to AISC 360-16.

A_nv
F_u	362.846 N/mm²
R_n		AISC 360-16 J4-4
R_n / Ω

Required	Available	Check	Result
73.288 kN	176.213 kN	0.416	√

Angle Shear Rupture at Beam

The shear strength of connecting elements in shear is the minimum value obtained according to the limit states of shear yielding and shear rupture. Shear rupture is checked according to AISC 360-16.

A_nv
F_u	362.846 N/mm²
R_n		AISC 360-16 J4-4
R_n / Ω

Required	Available	Check	Result
73.288 kN	436,286 kN	0.168	√

Angle Block Shear at Beam

The block shear limit state is checked according to AISC 360-16. All block shear modes combined with tensile failure on one plane and shear failure on a perpendicular plane are checked according to AISC 360-16.

A_g
A_nv
A_nt
F_y	235.359 N/mm²
F_u	362.846 N/mm²
U_bs	1.0

R_n		AISC 360-16 J4-5
R_n / Ω

Required	Available	Check	Result
73.288 kN	505.94 kN	0.145	√

Bolt Bearing on Beam

Bearing strength limit states of the connection plate that are “shear tear out” and “ovalization of bolt hole” for both end and inner bolts are checked according to AISC 360-16.

d_h	20+2=22 mm
L_c,edge
R_n		AISC 360-16 J3-6a
R_n-edge
L_c,spacing
R_n-spacing
R_n
R_n / Ω

Required	Available	Check	Result
73.288 kN	185,487 kN	0.395	√

Bolt Bearing on Angle at Beam

Bearing strength limit states of the connection plate that are “shear tear out” and “ovalization of bolt hole” for both end and inner bolts are checked according to AISC 360-16.

d_h	20+2=22 mm
L_c,edge
R_n		AISC 360-16 J3-6a
R_n-edge
L_c,spacing
R_n-spacing
R_n
R_n / Ω

Required	Available	Check	Result
73.288 kN	569.505 kN	0.129	√

Bolt Shear at Beam

The calculation is made using the Elastic method, one of the methods selected in the steel analysis settings tab. For the details of this check, AISC Manual 14th 7-8 is used as a reference.

In this check, the operation is performed on half of the symmetry axis and is calculated to form a force pair with the required force.

A_b
F_n
R_n
R_n / Ω

Required	Available	Check	Result
40.195	113.097 kN	0.355	√

Weld Strength at Support

F_e	480000 kN/m²
w	7.072
F_u	362.846 N/mm²
l	239 mm
Rn
R_n / Ω

Required	Ready	Rate	Control
73.288 kN	171.6 kN	0.427	√

Next Topic

Double Angle Connection Design Report with AISC 360-16

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