# Stress in Concrete

## Example 04: Stress of Tension Steel, Stress of Compression Steel, and Stress of Concrete in Doubly Reinforced Beam

**Problem**

A 300 mm × 600 mm reinforced concrete beam section is reinforced with 4 - 28-mm-diameter tension steel at *d* = 536 mm and 2 - 28-mm-diameter compression steel at *d'* = 64 mm. The section is subjected to a bending moment of 150 kN·m. Use *n* = 9.

1. Find the maximum stress in concrete.

2. Determine the stress in the compression steel.

3. Calculate the stress in the tension steel.

## Example 01: Total Compression Force at the Section of Concrete Beam

**Problem**

A rectangular reinforced concrete beam with width of 250 mm and effective depth of 500 mm is subjected to 150 kN·m bending moment. The beam is reinforced with 4 – 25 mm ø bars. Use alternate design method and modular ratio *n* = 9.

- What is the maximum stress of concrete?
- What is the maximum stress of steel?
- What is the total compressive force in concrete?