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LECTURE #1

LECTURE #1. Book Overview. Read Chapt. 1(skip sect. 1.9) Chapter 2 - Design Loads Skip Chapter 3- Lateral Forces Chapter 4- Wood Properties. LECTURE # 1 COURSE OVERVIEW. Owner Retains Architectural/ Engineering Design Firm .

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LECTURE #1

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  1. LECTURE #1 Book Overview Read Chapt. 1(skip sect. 1.9) Chapter 2 - Design Loads Skip Chapter 3- Lateral Forces Chapter 4- Wood Properties

  2. LECTURE # 1 COURSE OVERVIEW Owner Retains Architectural/ Engineering Design Firm Design firm Produces a Drawing to meet Owner’s Objectives and Goals Iterative Process for Design Aims Towards an Optimum Solution (Cost, Efficiency, Life Cycle Costing) Final Decision is made and Job Bidding Begins

  3. Iterative Procedure Planning - establish the various functions of the structure Preliminary Configuration of Structure - arrange the structural elements of the bldg. Model Loads - establish loading pattern (ex. LL,DL, etc) Preliminary Member Selection - Based on elements and loads to meet planned function Structural Analysis - perform a detail analysis of each member Refine member design - refine design based on adequacy, strength, and services of the G.C. Evaluation and Redesign - Has Optimum Solution been Achieved?

  4. LECTURE # 1(contd...) • (CET 331) • Designing the loads begin from the top of the proposed structure • Stresses can be calculated in each member based on the tributary loading • Selection of material is based on the actual stresses • The entire structural system is analyzed for lateral forces (wind & seismic) • (CET 411) • Cost of the structure is evaluated

  5. Centroids, Moments of Inertia,Radius of Gyration, and Section Modulus Parallel Axis Theorem -is the summation of the momentsof inertia for for composite Areas S = I/c Section Modulus – most useful property for designing beams where c is the distance to the extreme fiber from the neutral axis Radius of Gyration – is useful for comparative purposes but has no physical significance

  6. Centroids, Moments of Inertia,Radius of Gyration, and Section Modulus Centroid of an Area – Is the first moment (Center of Gravity) The centroid of an area can be considered to be the point where the area is concentrated Moment of Inertia – Is the second moment x datum y x x y c y datum

  7. INTRODUCTION TO CET331 WHAT KNOWLEDGE BASE SHOULD WE UNDERSTAND TO HANDLE TIMBER AND MASONRY DESIGN? • STRENGTHS OF MATERIALS • STEEL AND CONCRETE DESIGN WHAT PARAMETERS AND PROPERTIES IN STRENGTH OF MATERIAL IS USEFUL FOR THIS COURSE? • PARAMETERS(INCLUDE): • AREA AND CENTER OF GRAVITY • MOMENT OF INERTIA • SECTION MODULUS AND RADIUS OF • GYRATION

  8. HOW IS THE USE OF THIS MATERIAL GOVERNED?? MODEL CODES - BOCA, UBC, SBC .......... IBC 2000 IS HERE!!! ASTM & ACI (STANDARDS FOUND IN THE TEXT BOOK) AISC & ASSHTO (OTHER STANDARDS) STRENGTH OF MATERIAL REVIEW COMPRESSION TENSION TORSION THIRD POINT LOADING

  9. 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)

  10. GENERAL DEFORMATION EQUATION Mild steel :

  11. Static of Simple Structures Concentrated Load Uniformly distributed load Regular varying load Statically indeterminate structure is a structure that reactions cannot be computed from the equation of static equilibrium

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