1 / 13

190 likes | 893 Vues

Basic Design Principles For Reinforced Concrete Beam. P = 0. A. N.A. A - A. A. A Simply Supported Reinforced Concrete Beam -. R (Radius of Curvature). Compression. P. N.A.(Zero Stress Line). Tension. Three stages before collapse: 1. Un-cracked Concrete stage

Télécharger la présentation
## Basic Design Principles For Reinforced Concrete Beam

**An Image/Link below is provided (as is) to download presentation**
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.
Content is provided to you AS IS for your information and personal use only.
Download presentation by click this link.
While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

**Basic Design Principles**For Reinforced Concrete Beam**P = 0**A N.A. A - A A A Simply Supported Reinforced Concrete Beam -**R (Radius of Curvature)**Compression P N.A.(Zero Stress Line) Tension Three stages before collapse: 1. Un-cracked Concrete stage 2. Cracked Concrete (tension zone) - Elastic Stage 3. Cracked Concrete (tension zone) - Ultimate Strength Stage**Typical Stress-Strain Curves for Concrete and Reinforcing**Steel**R (Radius of Curvature)**Compression P N.A.(Zero Stress Line) Tension 1. Un-cracked Concrete stage**Compression**P Tension 1. Un-cracked Concrete stage**Compression zone**d h Stress Diagram Strain Diagram b Compressive Stress fc' Tension Zone ft = fr = 7.5 fc' Tensile Stress 1. Un-cracked Concrete Stage ft < fr M < Mcr fc = ft << fc' fc ft = fc Stress-Strain Diagram for Concrete**Section 1-1**fc C=T ; fc = ft M = 0.5fc x (b x 0.5h) x (2/3 h) = 1/6 fc x b x h2 fc = ft = 6M/(bh2) fc = ft = Mc/Ig where c = 0.5h Ig = bh3/12 C=0.5fc x (b x0.5h) OR 1/2 h M At ft = fr , where modulus of rupture, fr = 7.5 fc’ Cracking Moment Capacity, Mcr = fr x Ig/(0.5h) = (fr x b x h2)/6 2/3 h 1/2 h T=0.5ft x (b x0.5h) ft b Stress diagram**Compression zone**c < 0.003 d h fs =0.5 fy s = fs/Es Stress Diagram Strain Diagram b Compressive Stress Tension Zone Concrete Cracked fc' 0.45fc' fy 0.003 0.5fy ft = fr = 7.5 fc' Es Tensile Stress Stress- Strain Diagram for Reinforcing steel in Tension Stress- Strain Diagram for Concrete in Compression 2. Cracked Concrete (Tension Zone) - Elastic Stage ft > fr M > Mcr fc = 0.45fc' fs =0.5 fy**Compression zone**c = 0.003 d h T = Asfy s = fy/Es Stress Diagram Strain Diagram b Compressive Stress Tension Zone Concrete Cracked fc' fy Es 0.003 Stress-Strain Diagram for Concrete in Compression Stress-Strain Diagram for Reinforcing Steel in Tension 3. Cracked Concrete (Tension Zone) - Ultimate Strength Stage ft > >fr M > >Mcr fs = fy fc = entire stress block until compression failure **COMPRESSION**TENSION Figure 4 Manipulated Image visualization for flexural failure. (Digital image from Northridge Collection, Earthquake Engineering Research Center, University of California, Berkeley)**Concrete in compression**1 fc C b M c T Reinforcing Steel in tension 1 Neglect concrete in tension

More Related