rms the punching load check based on the requirements for nted in Section 4.3.1 of the American Petroleum Institute ted with the. check also 4.3.2 of the reference[r]
(1)Design Parameters Page of
©COMPUTERS AND STRUCTURES,INC.,BERKELEY,CALIFORNIA JUNE 2008
TUBULAR T HI
TECH
S EEL FRAME PUNC NG LOAD CHECK NICAL NOTE WSD2000CHECK –NOMINAL LOAD METHOD This section describes the methodology used for the punching
when the steel design code is set to API RP2A-WSD2000 and the method is specified to be used to calculate the punching load s that both the steel design code and the punching load method, punchi
load check nominal load tresses Note which can be ng shear or nominal load for the API RP2A-WSD2000 design code, are cessed using
gn > View/Revise Preferences
based on criteria published in Sections 4.3.1 and 4.3.2 of
Design Parameters
meters
me of the geometric parameters used in the punching ured from the chord to the brace
e T = Chord thickness d = Brace diameter D = Chord diameter
In addition, three more geometric parameters are derived from those shown in Figure They are as follows:
specified in the steel design preferences The preferences are ac the Design > Steel Frame Desi
command
The design check is
the American Petroleum Institute 2000 reference
Joint Geometric Para Figure illustrates so load check They are:
θ = Angle meas g = Gap distanc
t = Brace thickness
T t
τ
D d
β
2T D
(2)Tubular Steel Frame Punching Load Check WSD2000 Check – Nominal Load Method
Overview of Punching Load Check Page of
T
D g
d t
θ
Chord Brace Brace
Figure 1: Joint Geometric Parameters
Chord Yield Strength
The chord yield strength is designated Fyc It is taken as the smaller of the thirds of the
rms the punching load check based on the requirements for nted in Section 4.3.1 of the American Petroleum Institute ted with the
check also 4.3.2 of the reference
Allowable Loads
The allowable axial load, Pa, and allowable bending load, Ma, are calculated using API equations 4.3.1-4a and 4.3.1-4b The one-third allowable stress
d for Pa and Ma where applicable
yield strength, Fy, of the considered chord member and two-tensile strength, Fu, of the chord member
Overview of Punching Load Check
The program perfo simple joints prese
2000 reference In addition, if the joint classification associa considered brace is specified as K Overlap, the punching load considers the equations present in Section
increase is include
sinθ
1.7 T F Q Q P
2 yc f u
(3)Tubular Steel Frame Punching Load Check WSD2000 Check – Nominal Load Method
Simple Joint Check Ratios Page of
0.8d
sinθ
1.7 f u a
Equation is used for both in-plane and out-of-plane bending In and 2, Qu is determined from
T F Q Q M
2 yc
Eqn
Equations API Table 4.3.1-2 and Qf is calculated as n the following subsection Note that it is also possible for the user Calculation of Q
Qf value used in Equation is calculated as follows
Eqn
λ = 0.030 for brace axial stress
λ = 0.045 for in-plane bending stress
λ = 0.021 for out-of-plane bending stress described i
to directly specify values for Qu and Qf
f
The
2 f 1.0 λγA
Q
where,
and,
yc OPB
IPB
AX f f f
A
0.6F Eqn
nominator of The one-third allowable stress increase is included in the de
Equation where applicable In Equation 4, the terms fAX, fIPB and fOPB are the nominal axial, in-plane bending and out-of-plane bending stresses in the tensile The am considers this condition to be met when the axial stress in the chord is tensile and
chord
Qf is set to 1.0 when all extreme fiber stresses in the chord are progr
0 f
f
fAX IPB OPB
Simple Joint Check Ratios