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Let's try an example. The picture below illustrates the panel's shape, dimension and also proposed insert locations.
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Using
Beam Model:
You can obtain the result
of vertical direction easily, but it is very hard to get any information
in horizontal direction, even do not consider interactive between horizontal
and vertical. There is no obvious zero shear line between the bottom line
and the first row insert.
Using Finite Element Analyze (2D) Model:
You can have panel results in all directions -- vertical bendingmoment
at bottom (MYBOT) ; vertical bendingmoment at top (MYTOP) ; horizontal
bendingmoment at bottom (MXBOT) ; horizontal bendingmoment at top (MXTOP)
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(Click on the small pictures or text in blue to view higher resolution imges.)
Some observations from the above results:
- In the first row insert level, the vertical bendingmoment at bottom in the middle leg is three times higher than the other two legs. Between the first row insert and the second row insert level, the vertical bending moment at bottom of three legs are roughly the same.
- In the first row insert level, the vertical bendingmoment at top in the middle leg is close to zero, in the side legs are higher up to 3.4 klb*ft/ft. Temporary wind load introduces a vertical bendingmoment at top at bracing point.
- The horizontal bendingmoment at bottom in the lower lintel is 7.64klb*ft/ft, this indicates the interactive between the lower lintel and the middle leg.
- The horizontal bendingmoment at top in the middle of top lintel is 1.2 klb*ft/ft, shows that the middle leg has a relative bigger stiffness than the top lintel.
Contact Element:
Using contact element can avoid ground providing hold down force to the bottom edge of a panel and also exactly model the relationship between ground and the bottom edge of the panel. The following is an example showing the difference of using contact element and without contact element.
The picture above illustrates the panel's shape, dimension and proposed insert locations.
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MYBOT
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MYTOP
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MXBOT
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Without Contact Element at Bottom
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With Contact Element at Bottom |
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(Click on the small pictures to view higher resolution imges.)
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MXTOP
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UZ
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Without Contact Element at Bottom
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With Contact Element at Bottom |
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MYBOT -- Vertical bottom bending moment envolop contour
-
MYTOP -- Vertical top bending moment envolop contour
- MXBOT -- Horizontal bottom bending moment envolop contour
- MXTOP -- Horizontal top bending moment envolop contour
- UZ -- Out of plan displacement contour
Notice the significant difference of the vertical bendingmoment at bottom (MYBOT) of the legs.
