# V. AISC ASD - Select Wide Flange Beam 1

Determine the optimum W shape that spans 30 ft, and is braced at 7.5 ft intervals.

## Reference

AISC Allowable Stress Design, 9th Edition,Example 6, page 2-35.

## Problem

Three concentrated loads of 20 kips each at quarter span points. Desired beam depth of 18 in.

 Fy =36 ksi

## Comparison

Table 1. Comparison of results
Selected section W18x86 W18x86 none

The file C:\Users\Public\Public Documents\STAAD.Pro CONNECT Edition\Samples\ Verification Models\09 Steel Design\US\AISC\AISC ASD - Select Wide Flange Beam 1.STD is typically installed with the program.

STAAD SPACE AISC VERIFICATION PROBLEM FOR BENDING CAPACITY. PAGE 2-35 OF
START JOB INFORMATION
ENGINEER DATE 22-Sep-18
END JOB INFORMATION
* 9TH ED. AISC-ASD EXAMPLE 6.
* RATIO SHOULD BE APPROXIMATELY 1.0
UNIT FEET KIP
JOINT COORDINATES
1 0 0 0; 2 30 0 0;
MEMBER INCIDENCES
1 1 2;
MEMBER PROPERTY AMERICAN
1 TABLE ST W18X35
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 PINNED
2 FIXED BUT MZ
1 CON GY -20 7.5
1 CON GY -20 15
1 CON GY -20 22.5
PERFORM ANALYSIS
UNIT INCHES KIP
PARAMETER 1
CODE AISC
DMAX 19 ALL
MAIN 1 ALL
BEAM 1 ALL
FYLD 36 ALL
UNL 90 ALL
TRACK 2 ALL
SELECT OPTIMIZED
FINISH

STAAD.PRO MEMBER SELECTION - (AISC 9TH EDITION)   v1.0
***********************************************
|--------------------------------------------------------------------------|
|                                                    Y        PROPERTIES   |
|*************                                       |        IN INCH UNIT |
|            *  |=============================|   ===|===     ------------ |
|MEMBER   1  *  |  AISC SECTIONS              |      |        AX =  25.30  |
|            *  | ST  W18X86                  |      |   --Z  AY =   7.95  |
|DESIGN CODE *  |                             |      |        AZ =  11.38  |
| AISC-1989  *  ===============================   ===|===     SY =  31.53  |
|            *                                                SZ = 166.30  |
|            *  |&lt;---LENGTH (FT)=   30.00 --->|               RY =   2.63  |
|*************                                                RZ =   7.78  |
|                                                                          |
|                300.0 (KIP-FEET)                                          |
|PARAMETER        |                   L1                      STRESSES     |
|IN KIP  INCH     |               L1      L1                  IN KIP  INCH |
|---------------  +           L1              L1              -------------|
| KL/R-Y= 136.88  |                                           FA  =   7.97 |
| KL/R-Z=  46.29  +                               L1          fa  =   0.00 |
| UNL   =  90.00  |       L1                                  FCZ =  23.76 |
| CB    =   1.00  +                                           FTZ =  23.76 |
| CMY   =   0.85  |   L1                              L1      FCY =  27.00 |
| CMZ   =   0.85  +                                           FTY =  27.00 |
| FYLD  =  36.00  |L0                                     L0  fbz =  21.65 |
| NSF   =   1.00  +---+---+---+---+---+---+---+---+---+---|   fby =   0.00 |
| DFF   =   0.00 -16.7                                        Fey =   7.97 |
| dff=      0.00               ABSOLUTE MZ ENVELOPE           Fez =  69.68 |
| (KL/R)max = 136.88              (WITH LOAD NO.)             FV  =  14.40 |
|                                                             fv  =   1.26 |
|                                                                          |
|                      MAX FORCE/ MOMENT SUMMARY  (KIP-FEET)               |
|                      -------------------------                           |
|                                                                          |
|                AXIAL      SHEAR-Y    SHEAR-Z    MOMENT-Y    MOMENT-Z     |
|                                                                          |
|      VALUE       0.0        30.0        0.0         0.0       300.0      |
|   LOCATION       0.0         0.0        0.0         0.0        15.0      |
|                                                                          |
|**************************************************************************|
|*                                                                        *|
|*                         DESIGN SUMMARY  (KIP-FEET)                     *|
|*                         --------------                                 *|
|*                                                                        *|