Philippine Electrical Code - Electrical Wiring System

Building Management SystemFull description

Building Management System

NsbFull description

Tables with properties of steel joists.Descripción completa

Floor Systems and Roof Slab System

Slab

joist

Reinforced Concrete II

Hashemite University

The Hashemite University Department of Civil Engineering

Lecture 2 – One One--way Joist Slab System Dr. Dr Hazim Dwairi

Dr. Hazim Dwairi

The Hashemite University

Reinforced Concrete II

One--way Joist Floor System One

Dr. Hazim Dwairi

Dr. Hazim Dwairi

The Hashemite University

Reinforced Concrete II

1

Reinforced Concrete II

Hashemite University

One--way Joist Floor System One

Dr. Hazim Dwairi

The Hashemite University

Reinforced Concrete II

One-way Joist OneFloor System General G l fframing i layout of the pan joist system

Dr. Hazim Dwairi

Dr. Hazim Dwairi

The Hashemite University

Reinforced Concrete II

2

Reinforced Concrete II

Hashemite University

General framing layout of the pan joist system

Dr. Hazim Dwairi

The Hashemite University

Reinforced Concrete II

ACI Code Recommendations • ACI 8.13.1: Joist construction consists of a monolithic combination of regularly spaced ribs and a top slab arranged to span in one direction or two orthogonal directions. Solid Slab, hs = larger of hs

S

Slope 1:12

Min. b=100mm Dr. Hazim Dwairi

Dr. Hazim Dwairi

50mm without filler 40mm with filler (1/12) S

Max. = (3.5)b

Max. 750mm

The Hashemite University

Reinforced Concrete II

3

Reinforced Concrete II

Hashemite University

Minimum Slab System Depth • Based on deflection control. use table 9.5(a) in the ACI code to check minimum thickness required.

Dr. Hazim Dwairi

The Hashemite University

Reinforced Concrete II

Distribution Rib (Cross Rib) Distribution Ribs • Placed p perpendicular p to jjoists* • Spans < 6.0 m: Use None • Spans 6.06.0-9.0 m: Provided at midspan • Spans > 9.0 m: Provided at thirdthirdpoints • At least l t one continuous ti φ12 b bar iis provided at top and bottom of distribution rib. *Note: not required by ACI Code, but typically used in construction Dr. Hazim Dwairi

Dr. Hazim Dwairi

The Hashemite University

Reinforced Concrete II

4

Reinforced Concrete II

Hashemite University

Dead Load Calculations • Permanent loads such as fixed machines or furniture • Weight of the structural elements (R.C. unit weight = 25 kN kN/m /m3) • Weight g of fixed attachments such as tiles, mortar, false ceiling …etc.

Cases of Loading (Pattern Loads) • Using influence lines to determine pattern loads • Largest moments in a continuous beam or frame occur when some spans are loaded and others are not. • Influence lines are used to determine which spans to load and which spans not to load.

Dr. Hazim Dwairi

The Hashemite University

Reinforced Concrete II

Qualitative Influence Lines The Mueller Mueller--Breslau principle can be stated as follows: If a function at a point on a structure, such as reaction, or shear, or moment is allowed to act without restraint, the deflected shape of the structure, to some scale, represents the influence line of the function function.

Dr. Hazim Dwairi

Dr. Hazim Dwairi

The Hashemite University

Reinforced Concrete II

7

Reinforced Concrete II

Hashemite University

Qualitative Influence Lines

Dr. Hazim Dwairi

The Hashemite University

Reinforced Concrete II

One-way Joist Slab OneDesign Example • Design a typical joist and solid slab for the floor system shown below. • Floor system is part of residential building.

Dr. Hazim Dwairi

Dr. Hazim Dwairi

The Hashemite University

Reinforced Concrete II

8

Reinforced Concrete II

Hashemite University

One-way Joist Slab OneDesign Example 4400mm

4400mm

• Clear Span ln = 4400 – 400 = 4000 mm • Min. thickness hmin = 4000/18.5 = 216 mm • Use typical slab thickness h = 250 mm.