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Lesson 1 Compres s ion Members New Words 1. achieve achievement 2. eccentricity center, 中心; eccentric 偏心的；eccentricity 偏心，偏心距 3. inevitable evitable 可避免的 avoidable; inevitable 不可避免的 unavoidable 4. truss 桁架 triangular truss, roof truss, truss bridge 5. bracing brace 支柱，支撑；bracing, 支撑，撑杆 6. slender 细长，苗条；stout; slenderness 7. buckle 压曲，屈曲；buckling load 8. stocky stout 9. convincingly convince, convincing, convincingly 10. stub 树桩， 短而粗的东西；stub column 短柱 11. curvature 曲率；curve, curvature 12. detractor detract draw or take away; divert; belittle， 贬低，诽谤； 13. convince 14. argument dispute, debate, quarrel, reason, 论据（理由） 15. crookedness crook 钩状物，v 弯曲，crooked 弯曲的 16. provision 规定，条款 Phrases and Expressions 1. compression member 2. bending moment shear force, axial force 3. call upon (on) 要求，请求，需要 4. critical buckling load 临界屈曲荷载 critical 关键的，临界的 5. cross-sectional area 6. radius of gyration 回转半径 gyration 7. slenderness ratio 长细比 8. tangent modulus 切线模量 9. stub column 短柱 10. trial-and-error approach 试算法 11. empirical formula 经验公式 empirical 经验的 12. residual stress 残余应力 residual 13. hot-rolled shape 热轧型钢 hot-rolled bar 14. lower bound 下限 upper bound 上限 16. effective length 计算长度 2 Definition （定义） Compression members are those structural elements that are subjected only to axial compressive forces: that is, the loads are applied along a longitudinal axis through the centroid of the member cross section, and the stress can be taken as fa=P/A, where fa is considered to be uniform over the entire cross section. 受压构件是仅受轴向压力作用的构件，即：荷载是沿纵轴加在其截面形心上的，其应力可表示为…，式中，...