ESTIMATING METAL REINFORCEMENT

1. ESTIMATING METAL REINFORCEMENT

2. Steel Bars Steel is the most widely used reinforcing materials for almost all types of concrete construction. It is an excellent partner of concrete in resisting both tension and compression stresses. Steel is ten times stronger than concrete in resisting compression loads. Steel is 100 times stronger than concrete in resisting tensile stresses.

3. The design of concrete assumes that concrete and steel reinforcement acts together in resisting load and likewise to be in a state of simultaneous deformation.

4. BAR SPLICE, HOOK AND BEND In estimating reinforcing bars, one has to consider the additional length for the hook, the bend and the splice whose length varies depending upon the limitations as prescribed by the National Building Code.

6. Example: determine the length of splice joint for a 16mm and 20 mm steel bars under the following conditions: Tensile reinforcement of a beam Compressive reinforcement of a column

11. Various type of metal reinforcements that an estimator should be familiar with: Concrete hollow block reinforcement Footing reinforcements Post and column reinforcements Beam and girder reinforcements Floor slab reinforcements

12. Reinforcement of CHB Could be determined in three ways: Direct counting method Area method Unit block method

13. From figure 3-6, determine the number of 10x20x40 cm CHB Vertical reinforcements spaced at 80 cm Horizontal reinforcement at every 3 layers. (use 6m commercial length for steel bars)