1 intro2015

STRENGTH OF MATERIALS, COURSE CODE: INTRODUCTION: 2016 • Lecturers: Dr Lam Nguyen-Sy (Nguyễn Sỹ Lâm), B6, Civil Eng Building Email: lamns@hcmut.edu.vn, Phone: 0916511973 • Lectures: Monday … pm – … pm, Room 304 H2 - 205H2 Building Friday …pm – …pm, Room 403 H2 • Consultation: (1) try your peer students, (2) then try your tutor, (3) then Lecturers (room …, Tuesday …-…pm & Wednesday …- pm) STRENGTH OF MATERIALS, COURSE CODE: INTRODUCTION: 2015 MAIN BOOKS Đỗ Kiến Quốc, et al, Strength of Materials, 2007 Hibbeler RC, Mechanics of Materials, Fifth Edition, 2003 Gere JM, Mechanics of Materials, Fifth Edition, 2001 Problems on Mechanics of Materials (Vietnamese) AIMS The subject aims: - To equip the student with essential knowledge about external and internal forces occurring in simple structural elements under the action of various types of loadings - To understand the determination of the stresses, strains and displacements produced by the loads - To furnish an understanding of the mechanical behavior of materials, which is essential for the safe design of all structures in civil and mechanical engineering LEARNING EXPECTATIONS… What you think the STRENGTH OF MATERIALS course should be dealing with? LEARNING EXPECTATIONS… A DAM: WHAT IS THE BASIC PRINCIPLE OF ITS STRUCTURE? LEARNING EXPECTATIONS… A DOM: WHAT IS THE BASIC PRINCIPLE OF ITS STRUCTURE? LEARNING EXPECTATIONS… A BRIDGE: WHY DOES IT HAVE THIS SHAPE? FOR BEAUTY OR ANYTHING ELSE? LEARNING EXPECTATIONS… ANOTHER BRIDGE: IS THERE ANY IMPLICATION IN ITS SHAPE EXCEPT BEAUTY? LEARNING EXPECTATIONS… SOME BRIDGE MODELS: ANY GENERAL PRINCIPLES? LEARNING EXPECTATIONS… HIGH-RISE BUILDING: WHY DO PEOPLE NEED THESE KINDS OF STRUCTURES ? 1.3 EXTERNAL FORCES – SUPPORTS – REACTIONS 1.3.1 External forces (1) Load – Reaction Load: all information are known: strength – location – time – direction… Reaction: occur passively, depend on Load, have to calculate to know (2) Distribution patterns Point Load, concentrate load (Force): applied at a point [N, kN, MN, Ton, kGf…] Distribution Load (Forces): - applied on a line [N/m; kN/m; N/cm…] - applied on a surface (Area load) [N/m2; kN/m2…] - applied in a volume (Volume load): gravity; thermo-stress, acceleration… [kN/m3…] 1.3 EXTERNAL FORCES – SUPPORTS - REACTIONS 1.3.1 External forces 1.3 EXTERNAL FORCES – SUPPORTS - REACTIONS 1.3.2 Support/Connection - Reaction EQUILIBRIUM OF A DEFORMABLE BODY (CÂN BẰNG CỦA VẬT THỂ BIẾN DẠNG ĐƯỢC) • Support Reactions (Phản lực liên kết) • Equations of Equilibrium (Phương trình cân bằng) F  M /  • If an x,y,z cordinate system is established F  M  x x F  M  F  M  F M y y z z • With planar problems F x  0; y  0; o 0 1.4 BASIC FORCES – DEFORMATION STYLES Axial • Axial forces on a two force member result in only normal stresses on a plane cut perpendicular to the member axis 1.4 BASIC FORCES – DEFORMATION STYLES Axial 1.4 BASIC FORCES – DEFORMATION STYLES Bending 1.4 BASIC FORCES – DEFORMATION STYLES Shear Single Shear  ave  P F  A A Double Shear  ave  P F  A 2A 1.4 BASIC FORCES – DEFORMATION STYLES Torsion 1.4 BASIC FORCES – DEFORMATION STYLES Shear strain 1.5 BASIC HYPOTHESES  Materials hypothesis (Giả thiết v.liệu): Continuous, homogenous, isotropic, linearly (liên tục, đồng nhất, đẳng hướng)  Analytical model or Calculating Scheme (Sơ đồ tính)  Superpostion Principle (Cộng tác dụng)  Small Displacements 1.5 BASIC HYPOTHESES Linear Elastic 1.5 BASIC HYPOTHESES Superposition principle