Beam-Column Homework A single story, unbraced moment frame subject to gravity an

Question

Beam-Column Homework A single story, unbraced moment frame subject to gravity and wind loads is shown below. All loads shown are service loads, and the gravity load is made up of 25 % dead load and 75 % roof live load. Neglecting the self-weight of the beam, use A992 steel and select the lightest W shape for column AB based on an approximate second-order analysis (i.e. moment amplification method). Design for a drift index of 1/400 based on the service wind load. Bending is about the strong axis and each column is braced at the top in the weak direction. The bottom of the columns are rigidly connected to the foundation. You may use any available analysis tool to determine the first order axial loads and moments. However, be sure to provide both the inputs and outputs for the analysis if using a commercial software. 4 k/ft 5 k 21 0.51 15 ft 20 ftI 24 ft

Explanation / Answer

STAAD PLANE
START JOB INFORMATION
ENGINEER DATE 08-Oct-17
END JOB INFORMATION
INPUT WIDTH 79
UNIT FEET KIP
JOINT COORDINATES
1 0 0 0; 2 24 5 0; 3 0 20 0; 4 24 20 0;
MEMBER INCIDENCES
1 1 3; 2 3 4; 3 4 2;
DEFINE MATERIAL START
ISOTROPIC STEEL
E 4.176e+006
POISSON 0.3
DENSITY 0.489024
ALPHA 6e-006
DAMP 0.03
TYPE STEEL
STRENGTH FY 5184 FU 8352 RY 1.5 RT 1.2
ISOTROPIC CONCRETE
E 453600
POISSON 0.17
DENSITY 0.150336
ALPHA 5e-006
DAMP 0.05
TYPE CONCRETE
STRENGTH FCU 576
END DEFINE MATERIAL
MEMBER PROPERTY AMERICAN
1 TABLE ST W10X68
3 TABLE ST W10X39
2 TABLE ST W14X74
CONSTANTS
MATERIAL STEEL ALL
SUPPORTS
1 2 FIXED
LOAD 1 LOADTYPE None TITLE DL
MEMBER LOAD
2 UNI GY -1
LOAD 2 LOADTYPE None TITLE LL
MEMBER LOAD
2 UNI GY -3
LOAD 3 LOADTYPE None TITLE WL
JOINT LOAD
4 FX -5
LOAD COMB 4 STRENGTH COMB
1 1.2 2 1.0 3 1.0
LOAD COMB 5 SERVICEABILITY COMB
1 1.0 2 0.75 3 0.45
PDELTA ANALYSIS SMALLDELTA PRINT ALL
LOAD LIST 3
PARAMETER 1
CODE AISC UNIFIED 2010
CHECK CODE ALL
Load list 4
PARAMETER 2
CODE AISC UNIFIED 2010DFF 400 MEMB 1 3

CHECK CODE ALL
FINISH

ALL UNITS ARE - KIP INCH (UNLESS OTHERWISE Noted)

MEMBER TABLE RESULT/ CRITICAL COND/ RATIO/ LOADING/
FX MY MZ LOCATION
=======================================================================

1 ST W10X68 (AISC SECTIONS)
PASS Eq. H1-1b 0.671 4
53.19 C 0.00 1587.16 240.00

2 ST W14X74 (AISC SECTIONS)
PASS Eq. H1-1b 0.729 4
10.55 C 0.00 -2447.15 144.00

3 ST W10X39 (AISC SECTIONS)
PASS Eq. H1-1b 0.648 4
47.61 C 0.00 784.26 0.00

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