ENB 471: DESIGN OF CONCRETE

BUILDINGS AND FOUNDATION 1 original presentation by

Ario Y. Darestanimodified by

Charles Jetann

AGENDA

Issues that may influence your design

Initial loading estimate (LL and SDL)

Initial sizing of members

Fire Requirements

Columns

Initial Loading Estimate (DL)

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Rule of Thumb

Group Project Scope

First AssignmentSecond Assignment

Introduction to Tutorial Problem Scope

ISSUES THAT MAY INFLUENCE YOUR DESIGN

Site specific conditions;

Lateral stability system;

Fire Resistance

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Durability

Architectural requirements that restrict structural zonesor which introduce misalignment of vertical supportresulting in transfer loads

INITIAL LOADING ESTIMATE (LL AND SDL)

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Refer AS 1170.1 to determine LL and SDL acting on

your structure as follows:

Table 3.1 for LL acting on Floors;

Table 3.2 for LL acting on Roof;

Table 3.4 for Dynamic factors;

Appendix A for unite weight of materials and construction

Supp 1:2003 Appendix CA Unit Weight of Materials

INITIAL LOADING ESTIMATE (LL) - EXAMPLE

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Roof Area:

Table 3.1 Section E: Plant Room

LL = 5 kPa

Table 3.1 Section C3: Roof

LL = 4 kPa

Table 3.1 Section A1: Non-Habitable Roof

LL = 0.5 kPa

Engineering Justification

for Roof with minimum

access (Table 3.1 Section A1) :

LL = 2.0 kPa

INITIAL LOADING ESTIMATE (SDL) - EXAMPLE

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Roof Area:

Clay Tiling, 13 mm Thick : Table A2

SDL = 0.27 kPa

Mortar, 10 mm thick: Table

CA2(A),

SDL = 21 x 0.01 = 0.21 kPa

Damp-proof membrane

SDL = 0.025 kPa

Suspended Metal lath and

gypsum plaster, FRL of 2 hrs

SDL = 0.5 kPa

SDL = 0.27 + 0.21 + 0.025 + 0.5 =1.005 kPa

INITIAL SIZING OF MEMBERS - FIRE REQUIREMENTS

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Refer Section 5 of AS 3600 (FRL of 2 hrs):

For Slabs (Clause 5.5.1): T = 120 mm; For Beams (Clause 5.4.1B): Minimum Width = 200 mm; For Columns (Clause 5.6.3, N*f / Nu 0.5): Minimum

dimension = 350 mm, Shall at least contain 8 bars

distributed evenly on all sides of section

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INITIAL SIZING OF MEMBERS

For One-Way Slab and Beams: RC:

PT: L/32 for Single span, L/40 for End Span, and L/45 for Interior span

Rule of Thumb

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INITIAL SIZING OF MEMBERS

For Columns: Consider at least 2.5% of column dimension for

eccentricity in each direction;

Assuming square cross section:

EQ - 1

Note: Minimum Dimension of column is based on

Fire Design.

Rule of Thumb

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INITIAL SIZING OF MEMBERS EXAMPLE

Define Beam Direction Define Direction of Slabs For End Spans:

RC : T = L/24=325 mm PT : T = L/40=195 mm Both > 120 mm

For Interior Span: RC : T = L / 28=360 mm PT : T = L/45=225 mm

For RC Beams End Span: T =L/18.5= 315 mm

If using RC Slab, T = 325 mm

Interior Spans: T=L/21= 280 mm

If using RC Slab, T= 360 mm for

mid-bay

Beams

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,00

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80

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4 @ 5800

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INITIAL SIZING OF MEMBERS EXAMPLE

SD Column

Determine DL acting on the Floor Assuming using RC Slab, for the

Interior columns:

DL1= 0.325 x 25 = 8.125 kPa

DL2= 0.36 x 25 = 9 kPa

DLB = NA

Determine loading area of column A1= 3.9 x 5.8 = 22.62 m

2

A2= 5 x 5.8 = 29 m2

AT =51.62 m2

Determine P* (Refer AS 1170.0, Clause 4.2 for load combinations):

DL = 9 x 29 + 8.125 x 22.62 =

= 445 kN

SDL = 1.005 x 51.62 = 51.88 kN

LL = (5+2)/2 x 51.62 = 180.67 kN

325 mm

360 mm

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INITIAL SIZING OF MEMBERS EXAMPLE

SD Column

P* = 1.2 x (DL + SDL) + 1.5 x LL

= 867.26 kN

Determine Bending Actions: Mx = My = 0.025 x P* x a (kN.mm)

Using EQ-1, a can be calculated for fc = 32 MPa:

a = 279.8 or 280 mm

This is less than 350 mm. Hence, a = 350 mm is used

325 mm

360 mm

2 =1.3

0.45 = 78294.4 2

bSD of Supper b /2013L

Geotechnical Investigation

SD of Supper Structures Earthquake

Engineering

To Assess the Soil; To Determine or Estimates Soil

i h i d f

Gravity Loads

Lateral Loads

properties those required for foundation design

SD of one-way RC Wind E i i

Foundation Design

yor PT Slabs

SD of RC Beams SD of Columns

Engineering

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SD of Lateral Stability Systems 13

First Report

D of PT

D of

SCHEMATIC DESIGN (SD)

SCOPE OF WORK FOR THE FIRST PROJECT ISSUE

CALCULATION OF FORCESPRELIMINARY SIZES OFSTRUCTURAL FLOOR,

FRAMING AND FOOTINGS

Shallow FootingsShallow FootingsDeep Footings (Pi

Design Development of the one-way RC or PT Slab

Gravity Loads SD of one-way RC or PT Slabs

DD of the RC beamsWind and

Earthquake Forces

Gravity Loads Lateral Loads SD of RC Beams

DD of Lateral Resisting Gravity Loads L l L dDD of Lateral Resisting Systems Lateral Loads SD of Lateral Stability Systems

Gravity Loads

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DD of Columns Gravity Loads Lateral Loads SD of Columns

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Second Report

DEVELOPED DESIGN (DD)SCOPE OF WORK FOR THE SECOND PROJECT ISSUE

CALCULATIONS FOR THE DESIGNOF REINFORCED AND

POST-TENSIONED MEMBERS

CONSTRUCTION DOCUMENTATION (CD)

SCOPE OF WORK FOR THE SECOND PROJECT ISSUE

INCORPORATE ALL OF THE FEEDBACK FROMPREVIOUSLY ISSUED ASSIGNMENTS AND PREPAREA FINAL SET OF DRAWINGS AND CALCULATIONS TO

BE PRESENTED FOR EVALUATION BY THELECTURER AND COURSE COORDINATOR

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