土木工程概论（英文版）Chapter 9 Introduction to Design of Civil Engineering.ppt

土木工程概论Introduction to Civil Engineering 第九章　土木工程设计概述 Chapter 9 Introduction to Design of Civil Engineering Review Questions Explain the terms stress and strain. State Hook’s Law. Why is a factor of safety provided for a design? What is meant by working stress? Define (i) Poisson’s ratio (ii) hydrostatic pressure and (iii) volumetric strain. Introduction to Design of Civil Engineering A BELT ISNT THE ONLY THING THAT BUCKLES Many materials, in theory, have the same strength when being squeezed together (in compression) as they do when pulled apart (in tension). The problem is that if you press the two ends of a thin member (like a ruler) together, it doesnt simply stay straight and get shorter, but instead it bends out to the side. This is called buckling, which is the way that most tall, skinny things break when compressed end-to-end. Introduction to Design of Civil Engineering HOW CAN MY TRUSS FAIL? There are three ways your truss can fail. If a member buckles enough, it will bend and break in the direction in which the craft sticks have a low moment of inertia. This may be prevented if the loading frame supports partially buckled members. Another type of failure is that a craft stick pulls apart in the middle in tension. The third type of failure possible is joint break-out. This is when the craft stick breaks right where the bolt is connected. Introduction to Design of Civil Engineering Students in the Structures lab Building Envelope Performance Laboratory Full scale wall thermal resistance experiment Introduction to Design of Civil Engineering Structures Laboratory Introduction to Design of Civil Engineering Environmental Laboratory Introduction to Design of Civil Engineering Water Resources Laboratory Introduction to Design of Civil Engineering Building Aerodynamic Laboratory Introduction to Design of Civil Engineering Acoustics Laboratory Introduction to Design of Civil Engineering Indoor Air Quality and Ventilation Laboratory Introduction to Des