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NO3 L8 Structural Steel Behavior 青岛理工土木专业外语.ppt

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NO3 L8 Structural Steel Behavior 青岛理工土木专业外语.ppt
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LESSON 8 Structural Steel Behavior,2,Background Knowledge,所涉及到的课程:钢结构、钢筋混凝土结构。 结构钢材的特性:钢结构、钢筋混凝土结构所使用的钢材要满足多项要求,如对钢材强度、塑性、韧性和加工性能等的要求。 本课文涉及到钢材在静力荷载下的力学性能、钢材在重复荷载下的疲劳破坏、钢材在冲击荷载下的脆性断裂。,3,The content of the text,The text can be divided into 3 parts,4,New Words and Expression of Paragraph 1,mechanical property 力学性能、机械性能 idealized tensile stress-strain diagram 理想化的拉伸应力-应变图 (σ-ε图) slope n. 斜坡, 斜率 Young’s modulus of elasticity [ ilæs'tisiti ](E) 杨氏(弹性)模量 yield stress 屈服应力,5,New Words and Expression of Paragraph 1,ductility n. 延展性, 柔软性 strain-hardening 应变硬化 ultimate tensile stress 最大抗拉应力, 极限抗拉应力 reduction n. 减少, 缩影, 变形, 缩减量 load capacity 承载能力,6,The important mechanical properties of most structural steels under static load are indicated in the idealized tensile stress-strain diagram shown in Fig. 4. 1.,Part I Mechanical properties under static load,P 1(the explanation of idealized stress-strain relation for structural steel ),Fig.4.1 Idealized stress-strain relation for structural steel,,abscissa,[ æb'sisə ],longitudinal coordinates Y-coordinate, y-axis,8,Initially the steel has a linear stress-strain curve whose slope is the Young's modulus of elasticity. The values of E vary in the range 200’000-210’000MPa, and the approximate value of 200’000 MPa is often assumed.,linear adj. 线的, 直线的, 线性的 approximate adj. 近似的, 大约的,Paragraph 1,9,unload vi. 卸载, 卸货 approximate v. 近似, 接近, 接近, 约计 The design approximates perfection.,The steel remains elastic[I5lAstIk] while in this linear range, and recovers perfectly on unloading. The limit of the linear elastic behaviour is often closely approximated by the yield stress Fy, and the corresponding yield strain .,Paragraph 1,10,flow vi. 流动, 涌流 considerable adj. 相当大(或多)的, 相当可观的,Beyond this limit the steel flows plastically without any increase in stress until the strain-hardening strain is reached. This plastic range is usually considerable, and accounts for(导致、引起) the ductility of the steel.,Paragraph 1,11,The stres
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