Lecture #1 Student 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

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 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.

REVIEW OF LECTURE#1 LIST ALL OF THE COMMON CONSTRUCTION MATERIALS: WOOD CONCRETE BITUMENS MASONRY WHAT DETERMINES THE SELECTION OF THIS MATERIAL ?? COST SUITABILITY ENVIRONMENTAL IMPACT ACCEPTANCE, Q/C, R & D

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)

STRENGTH OF MATERIAL REVIEW (CHAPTER ONE CONT’D) COMPRESSIONTENSION TORSION THIRD POINT LOADING SPLIT TENSILE

STRAIN - STRAIN CURVES AND FORMULAS WHAT ARE OTHER BEHAVIORS OF INTEREST ?? DEFORMATION DUE TO THERMAL EXPANSION SEE PAGES 7 & 8 IN THE TEXT FOR SAMPLE PROBLEM & TABLES REMEMBER TO DO PROB.11 FOR HWK

ELASTIC LIMIT PROPORTIONAL LIMIT YIELD POINT ULTIMATE STRENGTH STRAIN STRESS STEEL VS CONCRETE Elastic Modulus(slope) or Young’s Modulus (E)

f’c:5700 psi f’c:4700 psi f’c:4100 psi f’c:3300 psi f’c:2600 psi strain(x10-4) Stress (psi) Stress - Strain Diagram of various concretes

ELASTIC FORMULAS w= the unit weight of concrete ACI 318 -modulus of Elasticity for normal concrete the equation simplifies to:

Modulus of Rupture Flexural Stress Equation max moment equation

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 lbs is being supported at the lower of the bar, determine the total elongation of the bar. (neglecting its own weight)

GENERAL DEFORMATION EQUATION Mild steel :

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

AIR DRY SAMPLE WITH VOIDS, WATER, SOLIDS VARIOUS DRYING CONDITIONS

OVEN DRY CORRECT LAB ERROR

SURFACE MOISTURE =TOTAL MOISTURE -ABSORPTION

SATURATED SURFACE DRY

OVEN DRIED WET SURFACE (LAB TESTING ERROR)

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

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

TEST#3- DRY RODDED UNIT WEIGHT WEIGH THE CONTAINER ROD 1/3 WITH 25 STROKES WEIGH THE CONTAINER & SAMPLE CALCULATE THE BULK DENSITY

TEST#4 TOTAL & SURFACE MOISTURE WEIGH FA & CA SAMPLE(AIR) OVEN DRY SAMPLES (OD) CALCULATE MOISTURES TEST# 6 & 7 SIEVE ANALYSIS