REINFORCED CONCRETE DESIGN 1-WORKING STRESS DESIGN

REINFORCED CONCRETE DESIGN 1

- WORKING STRESS DESIGN 4.5

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SECTION

A

d

L-+--r lof4

REINFORCED CONCRETE DESIGN 1

- WORKING STRESS DESIGN

The floor frame shown supports the following: = 100 mm thickness

o Slab o Super imposed o Live Load

Dead

Load

= 3 kPa (includes floor finish, ceiling fixtures, etc.) = 4.8 kPa

Beam Properties:

. lc =2LMPa . fs = 124 Mpa . n =10 o Weight of concrete = 24OO kg / m3 . assume b between h/L.75lo hlz Note:

o Use the Equivalent Uniform Load (EUL) {bose d on Yield Line Theory} . I represents a reinforced concrete column o Assume Live Load on all span

Design Exercise:

.

Design the span EF as beam reinforced for tension only.

Definition of Terms: BEAM (Dictionary of Civil Engineering) Poutre; Madrier Construction; Strength

of Materials;

Building

Materials

1. A

structural component mainly working in bending through the agency of vertical forces and that transmits to the bearing points the loads

that is applied to

it.

cIRDER (Dictionary of Civil Engineering) Poutre Construction Syn. with BEAM

1.

GIRDER (Merriam-Webster's Dictionary)

1. a horizontal

main structural member (as in building or bridge) that supports vertical loads and that consists of a single piece or of more than one piece bound together

2ot 4

N

REINFORCED C

1- WORKIN

DESIGN

Discussion on the Equivalent Uniform Load (EUL):

o

Formula:

1.

EUL @ Short Span

2.

EUL @ Long Span

WS

TRIANGULAR LOAD

3

wS t, l" 5

rr., - -2,

TRAPEZOIDAT LOAD

Notations & Definitions:

o W = uniformly distributed load in kPa o $ = length of short span in m. . m = ratio of the short span over long span (m = S/L) Condition: lf m > 0.50 use this EUL method for a two way slab distribution; otherwise use the one way slab distribution.

o

Example:

3of4

REINFORCED CONCRETE DESIGN 1

Considering span

STEP 1

- WORKING STRESS DESIGN

EFG

G

i2';

EUL1 I

+

EUL3

+

STEP 2 al I

.5 m--

-

w = EUL1+EUL2

>:< -- -4.5 m ,F:

> I

w = EUL3+EUL4

STEP 3

4.5 m

4of4