# V. AISC ASD - Wide Flange Beam Load Capacity 2

Determine the bending (transverse load carrying) capacity of a W16x40 shape.

## Reference

AISC Allowable Stress Design, 9th Edition, Example1, page 2-5.

## Problem

 Fy =36 ksi

 Luc = 9ft (Unbraced length of compression flange)

## Comparison

The reported STAAD.Pro value is obtained by multiplying the FCZ and SZ values from the STAAD.Pro output = 21.60(64.71) = 1397.7 in·kip = 116.5 ft·kips.

Table 1. Comparison of results
Result Type Theory STAAD.Pro Difference
Bending capacity (ft·kips) 116.5 116.5 none

The file C:\Users\Public\Public Documents\STAAD.Pro CONNECT Edition\Samples\ Verification Models\09 Steel Design\US\AISC\AISC ASD - Wide Flange Beam Load Capacity 2.STD is typically installed with the program.

``````STAAD SPACE AISC VERIFICATION PROBLEM FOR BENDING CAPACITY. PAGE 2-6 OF
START JOB INFORMATION
ENGINEER DATE 22-Sep-18
END JOB INFORMATION
* 9TH ED. AISC-ASD CODE EXAMPLE 2.
* CAPACITY SHOULD BE 116.5 KIP-FT. (SZ*FCZ SHOULD BE 116.5 KIP-FT).
UNIT FEET KIP
JOINT COORDINATES
1 0 0 0; 2 9 0 0;
MEMBER INCIDENCES
1 1 2;
MEMBER PROPERTY AMERICAN
1 TABLE ST W16X40
UNIT INCHES KIP
DEFINE MATERIAL START
ISOTROPIC MATERIAL1
E 29000
POISSON 0.3
END DEFINE MATERIAL
UNIT FEET KIP
CONSTANTS
MATERIAL MATERIAL1 ALL
SUPPORTS
1 FIXED
2 FY 12.94
PERFORM ANALYSIS
UNIT INCHES KIP
PARAMETER 1
CODE AISC
MAIN 1 ALL
FYLD 36 ALL
TRACK 2 ALL
CHECK CODE ALL
FINISH
``````

```                       STAAD.PRO CODE CHECKING - (AISC 9TH EDITION)   v1.0
********************************************
|--------------------------------------------------------------------------|
|                                                    Y        PROPERTIES   |
|*************                                       |        IN INCH UNIT |
|            *  |=============================|   ===|===     ------------ |
|MEMBER   1  *  |  AISC SECTIONS              |      |        AX =  11.80  |
|            *  | ST  W16X40                  |      |   --Z  AY =   4.39  |
|DESIGN CODE *  |                             |      |        AZ =   4.73  |
| AISC-1989  *  ===============================   ===|===     SY =   8.26  |
|            *                                                SZ =  64.75  |
|            *  |&lt;---LENGTH (FT)=    9.00 --->|               RY =   1.56  |
|*************                                                RZ =   6.63  |
|                                                                          |
|                116.5 (KIP-FEET)                                          |
|PARAMETER        |L1                                         STRESSES     |
|IN KIP  INCH     |   L1                                      IN KIP  INCH |
|---------------  +       L1  L1                              -------------|
| KL/R-Y=  69.01  |               L1                          FA  =  16.31 |
| KL/R-Z=  16.30  +                   L1                      fa  =   0.00 |
| UNL   = 108.00  |                       L1                  FCZ =  21.60 |
| CB    =   1.00  +                                           FTZ =  21.60 |
| CMY   =   0.85  |                           L1              FCY =  27.00 |
| CMZ   =   0.85  +                               L1  L1      FTY =  27.00 |
| FYLD  =  36.00  |                                       L0  fbz =  21.58 |
| NSF   =   1.00  +---+---+---+---+---+---+---+---+---+---|   fby =   0.00 |
| DFF   =   0.00  -6.5                                        Fey =  31.36 |
| dff=      0.00               ABSOLUTE MZ ENVELOPE           Fez = 562.02 |
| (KL/R)max =  69.01              (WITH LOAD NO.)             FV  =  14.40 |
|                                                             fv  =   2.94 |
|                                                                          |
|                      MAX FORCE/ MOMENT SUMMARY  (KIP-FEET)               |
|                      -------------------------                           |
|                                                                          |
|                AXIAL      SHEAR-Y    SHEAR-Z    MOMENT-Y    MOMENT-Z     |
|                                                                          |
|      VALUE       0.0        12.9        0.0         0.0       116.5      |
|   LOCATION       0.0         0.0        0.0         0.0         0.0      |
|    LOADING         0           1          0           0           1      |
|                                                                          |
|**************************************************************************|
|*                                                                        *|
|*                         DESIGN SUMMARY  (KIP-FEET)                     *|
|*                         --------------                                 *|
|*                                                                        *|
|*       RESULT/     CRITICAL COND/     RATIO/         LOADING/           *|
|         FX              MY             MZ           LOCATION             |
|        ======================================================            |
|          PASS        AISC- H1-3       0.999              1               |
|          0.00 T          0.00      -116.46             0.00              |
|*                                                                        *|
|                                                                          |
|--------------------------------------------------------------------------|
```