Flexural Analysis and Design of Beams.ppt

Lesson Plan Review New Words and Phrases Reading and Translating—Unit One Classroom Exercises Review Unit Seven Flexural Analysis and Design of Beams单 元 7梁的弯曲分析与设计 The chief task of the structural engineer is the design of structures. By design is meant the determination of the general shape and all specific dimensions of a particular structure so that it will perform the function for which it is created and will safely withstand the influences that will act on it throughout its useful life. These influences are primarily the loads and other forces to which it will be subjected, as well as other detrimental agents, such as temperature fluctuations, foundation settlements, and corrosive influences. The chief task of the structural engineer is the design of structures. By design is meant the determination of the general shape and all specific dimensions of a particular structure so that it will perform the function for which it is created and will safely withstand the influences that will act on it throughout its useful life. These influences are primarily the loads and other forces to which it will be subjected, as well as other detrimental agents, such as temperature fluctuations, foundation settlements, and corrosive influences. 结构工程师的主要任务是设计建筑物。所谓设计指确定某一特定建筑物的总体外形及所有的具体尺寸，使之起到应起的作用，并将能在其使用期限中安全地承受所受的影响。这些影响主要是它所承受的荷载和承受的力，以及其他危害因素，如气温变化（波动），基础沉陷，腐蚀影响。 Structural mechanics is one of the main tools in this process of design. As here understood, it is the body of scientific knowledge that permits one to predict with a good degree of certainty how a structure of given shape and dimensions will behave when acted up on by known forces or other mechanical influences. The chief items of behavior that are of practical interest are as follows： Structural mechanics is one of the main tools in this process of design. As here understood, it is the body of scientific knowledge that permits one to predict with a