Reason for placing the traverse reinforcement right angle to main bars
Theoretical Reason
In the school when we studied co-ordinate geometry, we expressed any point by X and Y co-ordinates. There was a reason for choosing two mutually perpendicular axes, i.e Ease of calculation and working with any problems. Similarly, when we design any slab we consider bending, deflection, shear etc in a plane which is represented by XY.
Hence for calculating all the forces and their effects we have a Longer span (ly) and a shorter span (lx) which are mutually perpendicular to each other. So the design becomes easier when we have reference axes perpendicular to each other. All the reinforcement spacing can be worked out easily and detailing becomes much much more convenient.
Practical Reason
In the site during execution if the reinforcements are perpendicular it is easy to execute by the bar benders. But if the reinforcements are not perpendicular, i.e they are meeting at an acute angle, every time measuring that angle and binding reinforcements are difficult and time consuming too. So for ease of work 90 degree angle is maintained between longitudinal and transverse reinforcements.
Theoretical Reason
In the school when we studied co-ordinate geometry, we expressed any point by X and Y co-ordinates. There was a reason for choosing two mutually perpendicular axes, i.e Ease of calculation and working with any problems. Similarly, when we design any slab we consider bending, deflection, shear etc in a plane which is represented by XY.
Hence for calculating all the forces and their effects we have a Longer span (ly) and a shorter span (lx) which are mutually perpendicular to each other. So the design becomes easier when we have reference axes perpendicular to each other. All the reinforcement spacing can be worked out easily and detailing becomes much much more convenient.
Practical Reason
In the site during execution if the reinforcements are perpendicular it is easy to execute by the bar benders. But if the reinforcements are not perpendicular, i.e they are meeting at an acute angle, every time measuring that angle and binding reinforcements are difficult and time consuming too. So for ease of work 90 degree angle is maintained between longitudinal and transverse reinforcements.
