Check Crack Width at Service Loads
Check the crack width at service loads for different locations of the elements in a spreadsheet format table.
Table Tool in midas Civil offers a variety of powerful built-in functions. Refer to Usage of Table Tool for detail directions:
From the Main Menu select PSC > PSC Design Result Tables > Check crack width at service loads
Upon executing
the PSC Design Result Table > Check crack width at service
loads, Records Activation Dialog prompts. Click .jpg){kind=small}
after selecting the output entities such as elements,
part number, Top./Bottom.
Refer to Usage of Table Tool and check the following data:
When AASTHO LRFD-12 is selected
Crack width check as per clause 5.7.3.4 of AASHTO LRFD-12
.jpg)
Check crack width at service loads
Elem: Element number
Part: Check location (I-End, J-End) of each element
Top/Bottom: At top of element, at bottom of element
LCom. Name: Load combination name.
Type: Displays the set of member forces corresponding to moving load case or settlement load case for which the maximum stresses are produced. If they are not defined then this field is left blank(-)
By default, member forces due to moving load case or settlement load case are not concurrent. In order to consider the concurrent member forces, namely, Fx, Fy, Fz, Mx, My and Mz each having its MAX. and MIN value, the program computes FT, FB, FTL, FBL, FTR, FBR for all these twelve sets.
For example: FT when Fx due to moving load is maximum is 30 N/mm2 and so on..
|
FT |
FB |
FTL |
FBL |
FTR |
FBR |
Fx- MAX |
30 |
40 |
25 |
35 |
35 |
30 |
Fx- MIN |
35 |
30 |
48 |
15 |
25 |
15 |
Fy- MAX |
30 |
32 |
37 |
26 |
28 |
21 |
Fy- MIN |
25 |
35 |
32 |
28 |
29 |
21 |
Fz- MAX |
18 |
15 |
19 |
14 |
15 |
10 |
Fz- MIN |
15 |
11 |
12 |
14 |
18 |
10 |
Mx- MAX |
1 |
2 |
4 |
1 |
2 |
3 |
Mx- MIN |
0.5 |
0.5 |
1 |
1 |
3 |
2 |
My- MAX |
18 |
19 |
15 |
22 |
21 |
18 |
My- MIN |
14 |
10 |
11 |
15 |
14 |
12 |
Mz- MAX |
3 |
9 |
12 |
11 |
8 |
9 |
Mz- MIN |
2 |
3 |
8 |
5 |
6 |
7 |
The set that results in maximum stress value FT, FB, FTL, FBL, FTR, FBR is displayed under 'Type' and the maximum stress value is displayed under FMAX. So as per above example, maximum stress value is 48, so it is displayed under FMAX, and it is from Fx-MIN set so under Type, Fx-MIN is displayed. All the values of this set will be displayed.
CHK: Crack width check for element
FT: Combined Stress due to bending moment about major axis (My) and axial force at Top fiber
FB: Combined Stress due to bending moment about major axis (My) and axial force at Bottom fiber
fss: Tensile stress in steel reinforcement at service limit state
s_use: Spacing of steel reinforcement provided
The spacing of Longitudinal reinforcement entered from Section Manager>Reinforcements shall be used as the applied spacing of tensile reinforcement. When the positive moment is checked, the spacing of bottom reinforcements will be used. When the negative moment is checked, the spacing of top reinforcements will be used.
s_max: Maximum spacing of steel reinforcement as per the equation 5.7.3.4-1 of AASHTO LRFD-12
When AASTHO LRFD-07 is selected
Crack width check as per clause 5.7.3.4 of AASHTO LRFD-07
.jpg)
Check crack width at service loads
Elem: Element number
Part: Check location (I-End, J-End) of each element
Top/Bottom: At top of element, at bottom of element
LCom. Name: Load combination name.
Type: Displays the set of member forces corresponding to moving load case or settlement load case for which the maximum stresses are produced. If they are not defined then this field is left blank(-)
By default, member forces due to moving load case or settlement load case are not concurrent. In order to consider the concurrent member forces, namely, Fx, Fy, Fz, Mx, My and Mz each having its MAX. and MIN value, the program computes FT, FB, FTL, FBL, FTR, FBR for all these twelve sets.
For example: FT when Fx due to moving load is maximum is 30 N/mm2 and so on..
|
FT |
FB |
FTL |
FBL |
FTR |
FBR |
Fx- MAX |
30 |
40 |
25 |
35 |
35 |
30 |
Fx- MIN |
35 |
30 |
48 |
15 |
25 |
15 |
Fy- MAX |
30 |
32 |
37 |
26 |
28 |
21 |
Fy- MIN |
25 |
35 |
32 |
28 |
29 |
21 |
Fz- MAX |
18 |
15 |
19 |
14 |
15 |
10 |
Fz- MIN |
15 |
11 |
12 |
14 |
18 |
10 |
Mx- MAX |
1 |
2 |
4 |
1 |
2 |
3 |
Mx- MIN |
0.5 |
0.5 |
1 |
1 |
3 |
2 |
My- MAX |
18 |
19 |
15 |
22 |
21 |
18 |
My- MIN |
14 |
10 |
11 |
15 |
14 |
12 |
Mz- MAX |
3 |
9 |
12 |
11 |
8 |
9 |
Mz- MIN |
2 |
3 |
8 |
5 |
6 |
7 |
The set that results in maximum stress value FT, FB, FTL, FBL, FTR, FBR is displayed under 'Type' and the maximum stress value is displayed under FMAX. So as per above example, maximum stress value is 48, so it is displayed under FMAX, and it is from Fx-MIN set so under Type, Fx-MIN is displayed. All the values of this set will be displayed.
CHK: Crack width check for element
FT: Combined Stress due to bending moment about major axis (My) and axial force at Top fiber
FB: Combined Stress due to bending moment about major axis (My) and axial force at Bottom fiber
fss: Tensile stress in steel reinforcement at service limit state
s_use: Spacing of steel reinforcement provided
s_max: Maximum spacing of steel reinforcement as per Clause 5.7.3.4 of AASHTO LRFD-07
When CAS-S6S1-2010 is selected
Crack width check as per clause 8.12.3.2 of CSA-S6S1-2010.
.jpg)
Check crack width at service loads
Elem: Element number
Part: Check location (I-End, J-End) of each element
Top/Bottom: At top of element, at bottom of element
LCom. Name: Load combination name.
Type: Displays the set of member forces corresponding to moving load case or settlement load case for which the maximum stresses are produced. If they are not defined then this field is left blank(-)
By default, member forces due to moving load case or settlement load case are not concurrent. In order to consider the concurrent member forces, namely, Fx, Fy, Fz, Mx, My and Mz each having its MAX. and MIN value, the program computes FT, FB, FTL, FBL, FTR, FBR for all these twelve sets.
For example: FT when Fx due to moving load is maximum is 30 N/mm2 and so on..
|
FT |
FB |
FTL |
FBL |
FTR |
FBR |
Fx- MAX |
30 |
40 |
25 |
35 |
35 |
30 |
Fx- MIN |
35 |
30 |
48 |
15 |
25 |
15 |
Fy- MAX |
30 |
32 |
37 |
26 |
28 |
21 |
Fy- MIN |
25 |
35 |
32 |
28 |
29 |
21 |
Fz- MAX |
18 |
15 |
19 |
14 |
15 |
10 |
Fz- MIN |
15 |
11 |
12 |
14 |
18 |
10 |
Mx- MAX |
1 |
2 |
4 |
1 |
2 |
3 |
Mx- MIN |
0.5 |
0.5 |
1 |
1 |
3 |
2 |
My- MAX |
18 |
19 |
15 |
22 |
21 |
18 |
My- MIN |
14 |
10 |
11 |
15 |
14 |
12 |
Mz- MAX |
3 |
9 |
12 |
11 |
8 |
9 |
Mz- MIN |
2 |
3 |
8 |
5 |
6 |
7 |
The set that results in maximum stress value FT, FB, FTL, FBL, FTR, FBR is displayed under 'Type' and the maximum stress value is displayed under FMAX. So as per above example, maximum stress value is 48, so it is displayed under FMAX, and it is from Fx-MIN set so under Type, Fx-MIN is displayed. All the values of this set will be displayed.
CHK: Crack width check for element
FT: Combined Stress due to bending moment about major axis (My) and axial force at Top fiber
FB: Combined Stress due to bending moment about major axis (My) and axial force at Bottom fiber
wk: calculated crack width (Refer to the clause 8.12.3.2 of CSA-S6S1-2010.)
wmax: Maximum crack width (Refer to the table 8.6 of CSA-S6S1-2010.)
De-icing Chemicals; Spray or Surface Runoff Containing De-icing Chemicals; Marine Spray; Swamp; Marsh; Salt Water; Aggressive Backfill: wmax = 0.15 mm
Other Environmental Exposure: wmax = 0.20 mm
When EUROCODE2-2:05 is selected
Elem: Element number
Part: Check location (I-End, J-End) of each element
Top/Bottom: At top of element, at bottom of element
LCom. Name: Load combination name.
Serviceability Load Type:Frequent/ Quassi-Static
Type: produce maximum and minimum member force components for the load combinations including moving load cases or settlement load cases.
Check:OK/NG
M_Ed:Maximum Moment in the Section.
Sig_T: Stress at the top.
Sig_B:Stress at the bottom.
wk:Crack width
wmax:Allowable crack limit