Lecture 1 Advance Design of RC Structure

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Advance Design of RC Structure

Lecture 1

Course Syllabus

Warm welcome to everybody

at our inspiring institute

University of Palestine

Lecture 1 Advance Design of RC Structure

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Subject

Course: Advance Design of RC Structure

Prerequisite: Design II

Class Room: BK-202

Semester: 2nd 2009

Grads: Assignments 30%

Midterm exam 30%

Final exam 40%

Tutor: M.Sc. Malek Abuwarda

engm01@hotmail.com

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Instructional Objectives Upon completion you would be able to: Workout the equivalent seismic load & wind

load on a building Design

Reinforced concrete shear wall, that can withstand the lateral load of the equivalent seismic load & wind load

Retaining wallRectangular and circular tanksMat foundation

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Course Outline Seismic design

IntroductionGeneral informationCauses of earthquakeSeismic wavesThe effects of seismic on structures

Method of analysis of structures under seismic load

Equivalent static load methodSymmetrical shear wallUnsymmetrical shear wallCore

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Course Outline Continued . . .

Using computer program SAP2000 or ETABS to analysis the equivalent static load on tall building if applicable

Shear wall design Wind Load

Wind pressureWind load & distribution

Retaining wallTypes Geotechnical designStructural design

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Course Outline Continued . . .

TanksGeneral informationRectangular tankCircular tank

Mat foundationGeneral informationGeotechnical designStructural design

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Course Materials

Lecture notesPower points slidesHandout sheets

TextbooksUniform Building Code UBC 1997International Building Code IBC 2002ACI-318 2005Reinforced Concrete Design Dr. Samir ShihadaEarthquake Engineering: Application to Design.

Charles K. Erdey

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What Causes Earthquake The Earth & its interior

Inner Core 1290 km Radius Outer Core 2200 km thicknessThe Mantle 2900 km thicknessCrust 5-40 km thickness

The circulationConvection currents develop in the

viscous Mantle, because of different pressure and temperature between the Crust & the Core That result in circulation of the

Earth’s mass. Hot Lava comes out & the cold rock mass goes into the Earth

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What Causes Earthquake Continued . . .

Plate Tectonics

Flows of Mantle material cause the crust to slide on the hot molten outer core

Sliding of earth mass takes place in pieces called Tectonic Plates

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What Causes Earthquake Continued . . .

The surface of the earth consists of seven major Tectonic Plates and many smaller ones

Plates move in different directions

Average movement of plate boundary 2-10 cm per year

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What Causes Earthquake Continued . . .

The Earthquake Rocks are made of elastic material

Elastic strain energy is stored

Rocks reach their strength

Sudden movement takes place Crack in the rocks formed

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What Causes Earthquake Continued . . .

Sudden slip taken place & release the enormous elastic strain energy stored

The sudden slip (EARTHQUAKE) causes a violent shaking of the earth & the released energy spreads out through SEISMIC WAVES that travel in all direction through the earth’s layers

Seismic WavesTwo types of waves

Body waves

Surface waves

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What Causes Earthquake Continued . . .

Body Waves Primary waves (P-Waves)

Extension & compression action

Speed 4.8 km/s (fastest)

Secondary waves (S-Waves) Vertical & horizontal action

Speed 3 km/s

Surface Waves Love waves

Horizontal component action

Rayleigh waves Vertical component action

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What Causes Earthquake Continued . . .

Measuring instruments

Seismograph

Some typical recorded

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Effects of Seismic on Structures Inertia force in structure

Seismic waves shaking the groundBuilding base moves with the groundUpper body has tendency to stay in its original positionWalls & columns drag the upper body along with them

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Effects of Seismic on StructuresIts much like when the ground moves, the building is

thrown backward or the upper body experience a force called INTERIA FORCE

Newton’s second law of motionUpper body has a mass mExperience an acceleration aThen F (inertia force) = m.a

a

F

That means the more mass the greater F (inertia force) you

get

so the lighter buildings sustain seismic better

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Effects of Seismic on Structures Effect of deformations in structures

Columns undergo relative movement between their endsTransfer the inertia force from the upper body of the

building to the ground

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Effects of Seismic on StructuresColumns resist deformation so develop inertia forces,

which called stiffensWalls & columns are the most critical elements in

resisting seismic

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Effects of Seismic on Structures Horizontal & vertical shaking

Earthquake shakes the ground in all direction

Ground shakes randomly back and forth (- & +) along in X, Y and Z direction

All structures are primarily designed to curry downward force, which called gravity load

factor of safety, used in the design of structures, magnifying the design gravity load (dead load + live load + other loads)

x

YZ

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Effects of Seismic on Structures Horizontal & vertical shaking

That means most of the designed structures adequate against vertical shaking

The horizontal shaking along X & Y direction (both + & - direction of each) is our big concern as a structural designer

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Discussions

Any Question?

Notes