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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
Result Type Theory STAAD.Pro Difference
Selected section W18x86 W18x86 none

STAAD Input

The file C:\Users\Public\Public Documents\STAAD.Pro CONNECT Edition\Samples\ Verification Models\09 Steel Design\US\AISC\ASD 9th Edition\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
LOAD 1
MEMBER LOAD
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 Output

                     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  |
  |            *  |<---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      |
  |    LOADING         0           1          0           0           1      |
  |                                                                          |
  |**************************************************************************|
  |*                                                                        *|
  |*                         DESIGN SUMMARY  (KIP-FEET)                     *|
  |*                         --------------                                 *|
  |*                                                                        *|
  |*       RESULT/     CRITICAL COND/     RATIO/         LOADING/           *|
  |         FX              MY             MZ           LOCATION             |
  |        ======================================================            |
  |          PASS        AISC- H1-3       0.911              1               |
  |          0.00 T          0.00      -300.00            15.00              |
  |*                                                                        *|
  |**************************************************************************|
  |                                                                          |