[Nasr Younis Abboushi] ACI-318M-08 Reinforced Conc(Bokos-Z1)Part1

CONTENTS

CHAPTER 1 REINFORCED CONCRETE STRUCTURES

CHAPTER 2 MATERIALS AND PROPERTIES

CHAPTER 3 DESIGN METHODS AND REQUIREMENTS

CHAPTER 4 FLEXIBLE IN BEAMS

CHAPTER 5 SHEAR IN BEAMS

 

CHAPTER 6 COLUMNS: COMBINED AXIAL LOAD AND BENDING

CHAPTER 7 SLENDER COLUMNS

1. Floor Slabs

Floor slabs are the main horizontal elements that transmit the moving live loads as well as the stationary dead loads to the vertical framing supports of a structure. They can be:

 Slabs on beams,

 Waffle slabs,

 Slabs without beams (Flat Plates) resting directly on columns,

 Composite slabs on joists.

They can be proportioned such that they act in one direction (one-way slabs) or proportioned so that they act in two perpendicular directions (two-way slabs and flat plates).

2. Beams

Beams are the structural elements that transmit the tributary loads from floor slabs to vertical supporting columns. They are normally cast monolithically with the slabs and are

Reinforced Concrete I Dr. Nasr Abboushi

structurally reinforced on one face, the lower tension side, or both the top and bottom faces. As they are cast monolithically with the slab, they form a T-beam section for interior beams or an L beam at the building exterior.

The plan dimensions of a slab panel determine whether the floor slab behaves essentially as a one-way or two-way slab

3. Columns

The vertical elements support the structural floor system. They are compression members subjected in most cases to both bending and axial load and are of major importance in the safety considerations of any structure. If a structural system is also composed of horizontal compression members, such members would be considered as beam-columns.

4.Walls

Walls are the vertical enclosures for building frames. They are not usually or necessarily made of concrete but of any material that esthetically fulfills the form and functional needs of the structural system. Additionally, structural concrete walls are often necessary as foundation walls, stairwell walls, and shear walls that resist horizontal wind loads and earthquake-induced loads.

5. Foundations

Foundations are the structural concrete elements that transmit the weight of the superstructure to the supporting soil. They could be in many forms:

 Isolated footing - the simplest one. It can be viewed as an inverted slab transmitting a distributed load from the soil to the column.

 Combined footings supporting more than one column.

 Mat foundations, and rafts which are basically inverted slab and beam construction.

 Strip footing or wall footing supporting walls.

 Piles driven to rock.

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