Civil Engineering Reference
In-Depth Information
r
f
(
b
2
/
b
1
) = 1
(
b
2
/
b
1
) = 2
σ
2
K
t
σ
1
K
t
σ
1
b
2
/2
b
1
/2
r
f
/
b
1
FIGURE 6.2a
Stress concentration factors for a flat bar with transition fillets in axial tension.
σ
s
σ
σ
3σ
FIGURE 6.2b
Stress concentration factors for a flat bar with round holes in axial tension.
members subjected to fluctuating stresses and ensure that an allowable fatigue stress
range based on the appropriate detail category is used.
6.2.3 S
ERVICEABILITY OF
A
XIAL
T
ENSION
M
EMBERS
Inordertoprecludeexcessivedeflection(e.g.,sagoflongmembersunderself-weight)
orvibration(e.g.,fromwindloadsonbracingmembers),theflexibilityofaxialtension
members must be limited. The maximum slenderness between points of support,
L
u
,
TABLE 6.2
Stress Concentration Factors for AREMA (2008)
Fatigue Detail Categories
Fatigue Detail Category
Stress Concentration Factor,
K
t
A
1.00
B
1.15
C
2.35
C
2.75
D
3.6
E
4.8
