CALCULATE THE BEAM DEPTH&WIDTH
CALCULATE THE BEAM DEPTH&WIDTH: In construction industry, we come across different types of beams with different materials like wood, steel, stone, concrete, R.C.C and prestressed concrete. All these beams are loaded with different types of loads, due to which it bends or deflects. The amount with which beam bends depends upon span of beam, type of load, elasticity of beam and type of beam. As a Civil Engineer we are very much interested in knowing the behaviour of beams under these loads.
The concept of shear force and bending moment, deflection are very interested in knowing the behaviour of beams under these loads. The concept of shear force and bending moment, deflection are very important in design of bending members We are restricting out study to shear force and bending moment only in this chapter. As Civil Engineer it is very much interested in finding maximum shear force and maximum bending moment and where it occurs. In design of beams these two parameters are very important. If any one who wants to become good Civil Engineer, he has to mastery learning of this chapter
A beam is a horizontal structural member resist to a transverse load perpendicular to its own axis. So in order to maintain the actions you of a structure, it is necessary to provide the proper size of a beam to resist a given set of loads. The size of a beam that is depth and width it depends upon the length available for casting the beam
CALCULATE THE DEPTH OF A BEAM
AS PER THUMB RULE
DEPTH= L/10 TO L/12
for illustration, let’s consider a beam
CLEAR SPAN OF BEAM=5000MM
DEPTH =L/10 =5000/10= 500MM
(OR) L/12=5000/12=417 SAYS 420
HENCE WE CAN CHOOSE ANY DEPTH BETWEEN 500 TO 420
CALCULATE THE WIDTH OF A BEAM
The ratio of width to depth
W/D>0.4 to 0.45 as IS
Note: minimum depth =200
for illustration, let’s consider a beam
CLEAR SPAN OF BEAM=3000MM
DEPTH =L/10 =3000/10= 300MM
Let the width of the beam= 200mm
W/D=200/300=0.66>0HOW.4 ( IT’S SAFE)
HENCE 200MM IS A SAFE WIDTH
for illustration, let’s consider a beam
CLEAR SPAN OF BEAM=6000MM
DEPTH =L/10 =6000/10= 600MM
Let the width of the beam= 200mm
W/D=200/600=0.33<0.4 is not safe
In this case let’s increase the width to 250mm
W/D= 250/600=0.41>0.4 ( it is safe)
Hence 250 mm is the safe width