lecture #1 student objectives: * you should know what the instructor expects from you to final grade...
TRANSCRIPT
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Lecture #1Student Objectives:
* You should know what the instructor expects from you to final grade
* You should be able to assess your level of knowledge for this course
* You should be able to recall the fundamentals of Strength of Materials
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Lab Requirements• All groups are required to have
a name and team captain. (group size 5 to 6 people)
• Each group must hand in one write-up and email their data to the instructor.
• Groups should state the level of participation from each individual.
• Groups will always meet in classroom before going over to Lab.
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REVIEW OF LECTURE#1LIST ALL OF THE COMMON CONSTRUCTION MATERIALS:
WOOD CONCRETEBITUMENSMASONRY
WHAT DETERMINES THE SELECTION OF THIS MATERIAL ??
COST
SUITABILITY
ENVIRONMENTAL IMPACT
ACCEPTANCE, Q/C, R & D
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WHAT ASPECTS OF THESE PROPERTIES ARE IMPORTANT??
MECHANICAL PROPERTIES - SHEAR, TORSION,TENSION, ETC.
PHYSICAL PROPERTIES - DENSITY, SPECIFIC GRAVITY, ETC
CHEMICAL PROPERTIES - ITS COMPOSITION, ITS REACTION WITH OTHER ELEMENTS
HOW IS THE USE OF THIS MATERIAL GOVERNED??
MODEL CODES - BOCA, UBC, SBC,IBC 2000
ASTM & ACI (STANDARDS FOUND IN THE TEXT BOOK)
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STRENGTH OF MATERIAL REVIEW(CHAPTER ONE CONT’D)
COMPRESSION TENSION
TORSION THIRD POINT LOADING
SPLIT TENSILE
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STRAIN - STRAIN CURVESAND FORMULAS
WHAT ARE OTHER BEHAVIORS OF INTEREST ??
DEFORMATION DUE TO THERMAL EXPANSION
LtcL
SEE PAGES 7 & 8 IN THE TEXT FOR SAMPLE PROBLEM & TABLES
TXAP
AEPL
E
REMEMBER TO DO PROB.11 FOR HWK
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ELASTIC LIMIT
PROPORTIONAL LIMIT
YIELD POINT
ULTIMATE STRENGTH
STRAIN
ST
RE
SS
STEEL VS CONCRETE
Elastic Modulus(slope)or Young’s Modulus (E)
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f’c:5700 psi
f’c:4700 psi
f’c:4100 psi
f’c:3300 psi
f’c:2600 psi
strain(x10-4)
Str
ess
(psi
)Stress - Strain Diagram of various concretes
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5.05.1 ')33( fcwE
ELASTIC FORMULAS
w= the unit weight of concrete
ACI 318 -modulus of Elasticity
for normal concrete the equation simplifies to:
5.0'57000 fcE
00005.02
12
SS
E
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2bdPl
MOR
Modulus of Rupture
SM
F b
Flexural Stress Equation
max moment equation
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SAMPLE DEFLECTION PROBLEM
A steel bar 4 sq. inches. in area is used to support a gravity load in building construction. If 1 foot of the bar is hanging vertically, and a load of 72000 lbs is being supported at the lower of the bar, determine the total elongation of the bar. (neglecting its own weight)
630 10E x psi
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GENERAL DEFORMATION EQUATION
Modulus of Elasticity =
P/AE = Stress / Strain =
/L = P.L / A.E
1"
4 "
1' - 0'
Mild steel :
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OVERVIEW OF CONCRETE TESTING
TEST THE AGGREGATES PROPERTIES
TEST THE CEMENT PROPERTIES
DESIGN THE MIX
BATCH THE MIX AND TEST IT
CRUSH CYLINDERS IN SEVEN DAYS
CRUSH CYLINDER IN 28 DAYS
PERFORM THE SPLIT TENSILE TEST
STRESS .VS. STRAIN
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AIR DRY
SAMPLE WITH VOIDS, WATER, SOLIDS
VARIOUS DRYING CONDITIONS
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OVEN DRY
CORRECT
LAB ERROR
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SURFACE MOISTURE
=TOTAL MOISTURE -ABSORPTION
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SATURATED SURFACE DRY
ODODSSD
ABS
%
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OVEN DRIED WET SURFACE
(LAB TESTING ERROR)
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SEVEN TEST FOR AGGREGATES
TEST#1 CA- Gs & ABSORPTION
WEIGH 8.8LB OF SAMPLE(AIR)
IMMERSE AGG IN WATER 24 HRS.
ROLL SAMPLE IN CLOTH (SSD)
SUBMERGE SAMPLE (SUB)
OVEN DRY THE SAMPLE (DRY)
CALCULATE -Gs (BULK), Gs (SSD),Gs(APPARENT), ABSORPTION
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TEST#2 FA- Gs & ABSORPTION
WEIGH 500g OF SAMPLE(AIR)
IMMERSE AGG OR 6% M.C. (24 HRS)
BLOW DRY SAND (SSD)
SUBMERGE SAMPLE IN PYNC (SUB)
OVEN DRY THE SAND (DRY)
CALCULATE -Gs (BULK), Gs (SSD),Gs(APPARENT), ABSORPTION
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TEST#3- DRY RODDED UNIT WEIGHT
WEIGH THE CONTAINER
ROD 1/3 WITH 25 STROKES
WEIGH THE CONTAINER & SAMPLE
CALCULATE THE BULK DENSITY
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TEST#4 TOTAL & SURFACE MOISTURE
WEIGH FA & CA SAMPLE(AIR)
OVEN DRY SAMPLES (OD)
CALCULATE MOISTURES
TEST# 6 & 7 SIEVE ANALYSIS