V. ACI 318-99 Beam and Column Reinforcement

Determine the area of reinforcing steel required for a beam and column in a moment frame.

Reference

CRSI Handbook and Notes on ACI-318-99.

Problem

A plane frame is created with such loading as to create 138 Kip-Ft moment on beam and 574 Kip of axial load coupled with above moment on column.

Size of the beam is 10" x 16"and size of the column 14" x 16".

P = 521.32 kip

w = 5.268 kip/ft

L = 20 ft, H = 15 ft

Concrete moment frame

Comparison

Table 1. Comparison of results
Result Type	Theory ACI Notes	Theory CRSI Handbook	STAAD.Pro	Difference
Area of Steel in beam	2.78 in²	X	2.792 in²	negligible
Area of Steel in column	X	4.01%	4.09% required(*) 4.232% provided	negligible

Note: (*) Area of steel required calculated as 9.164 in², which is 4.09% of a 14"x16" column.

STAAD Input

The file C:\Users\Public\Public Documents\STAAD.Pro CONNECT Edition\Samples\ Verification Models\10 Concrete Design\US\ACI 318-99 Beam and Column Reinforcement.STD is typically installed with the program.

STAAD PLANE VERIFICATION FOR CONCRETE DESIGN
START JOB INFORMATION
ENGINEER DATE 23-Sep-18
END JOB INFORMATION
UNIT FEET KIP
JOINT COORDINATES
1 0 0 0; 2 0 15 0; 3 20 15 0; 4 20 0 0;
MEMBER INCIDENCES
1 1 2; 2 2 3; 3 3 4;
UNIT INCHES KIP
MEMBER PROPERTY AMERICAN
1 3 PRIS YD 16 ZD 14
2 PRIS YD 16 ZD 10
DEFINE MATERIAL START
ISOTROPIC MATERIAL1
E 3150
POISSON 0.17
END DEFINE MATERIAL
CONSTANTS
MATERIAL MATERIAL1 ALL
SUPPORTS
1 4 FIXED
UNIT FEET KIP
LOAD 1 DEAD + LIVE
JOINT LOAD
2 3 FY -521.32
MEMBER LOAD
2 UNI GY -5.268
PERFORM ANALYSIS
PRINT MEMBER FORCES
START CONCRETE DESIGN
CODE ACI 1999
UNIT INCHES KIP
TRACK 1 MEMB 2
FYMAIN 60 ALL
FC 4 ALL
CLB 1.4375 ALL
DESIGN BEAM 2
DESIGN COLUMN 1
END CONCRETE DESIGN
FINISH

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