Ulma MK Structure - 5 System Properties; Main Item Properties

Construcción
ConstrucciónConstrucción
Construcción
43
MK
MK MK
MK STRUCTURE
STRUCTURESTRUCTURE
STRUCTURE
52
120
SYSTEM PROPERTIES
SYSTEM PROPERTIESSYSTEM PROPERTIES
SYSTEM PROPERTIES
It is rather difficult to define limits for the manifold possible structure options which can be formed with the MK
system. As for their variety, each structure must be calculated on an individual basis. Nevertheless, this chapter
gives the necessary data to perform these calculations, and presents some limits for the most critical elements.
Some working load tables for particular applications are given below which may serve as orientation on the
obtainable load-bearing capacity of these structures.
5.1.
5.1.5.1.
5.1. MAIN ITEM PROPERTIES
MAIN ITEM PROPERTIESMAIN ITEM PROPERTIES
MAIN ITEM PROPERTIES
5.1.1. WALER MK-120
The technical material properties of the WALER MK-120 are:
m = 27.5 [kg/m] weight/m
A = 27.5 10
-4
[m
2
] net section area (without holes)
f
y
= 275 [MPa] yield strength
Main axis (strong axis):
Av
zz
=12,32 10-
4
[m
2
] shear area
I
yy
= 680 10
-8
[m
4
] moment of inertia
W
elyy
= 113 10
-6
[m
3
] Young's modulus
Secondary axis (weak axis):
Av
yy
=17,2 10-
4
[m
2
] shear area
I
zz
= 311 10
-8
[m
4
] moment of inertia
W
elzz
= 38 10
-6
[m
3
] Young's modulus
W
plyy
= 128 10
-6
[m
3
] plastic section modulus?
The technical properties of the WALER MK-120 are (for SLS loads):
M
MM
M
Rdyy
RdyyRdyy
Rdyy
= 21.33
= 21.33= 21.33
= 21.33 (kN m)
(kN m)(kN m)
(kN m) Maximum permissible bending moment on axis y-y
V
VV
V
Rdzz
RdzzRdzz
Rdzz
= 118,2
= 118,2 = 118,2
= 118,2 (kN)
(kN)(kN)
(kN) Maximum permissible shear force on axis y-y?
M
MM
M
Rdzz
RdzzRdzz
Rdzz
= 6.3
= 6.3= 6.3
= 6.3 (kN m)
(kN m) (kN m)
(kN m) Maximum permissible bending moment on axis z-z
y
y
z
z