同济大学：《结构力学》课程教学资源（教案讲稿，打印版）01 Introduction

Chapter 1 Introduction What is ... √Structure √Structural analysis 同榜大学 土亦工程学院 人 Dinosaur(恐龙) Oak tree(橡树) spider web Roof structure Suspension bridge(悬索桥)TV tower 同傍大学 土亦工程学院

What is structure? Function Type √Skeleton(骨架) √Natural √Load carrying(承载) √Engineering √Stability(稳定) 同僑大学 土亦2程学院 TONGII UNIVERSIT Structural analysis Real Assumption Structural Calculation Structural structure (假定) model response (结构模型) (结构响应) 同傍大学 土亦工程学院 TONGII UNIVERSITY

Structural modeling Structural Load Connection element (action) 8 444 simplification Support 同停大学 目士本江程学院 TONGII UNIVERSITY Assumption on structural behavior 2D 3D 150 同海大学 6 TONGII UNIVERSITY 一/ZOF CIVIL ENGINEERIN布

Assumption on structural element 1D 2D 3D Assumption on connection and support Truss(桁架) Frame(框架) Arch rib Column e 同海大学 土本2程学院 8 TONGJI UNIVE家sTT COLLEGE OF CIVIL ENGINEERUING

Assumption on loading conditions Concentrated load Line load Surface load (集中荷载) (线荷载) (面荷载) 同海大学 土本2程学院 9 Assumption on structural material Ultimate stress 400 Compre Yield stress Rupture 300 90 200 100 0 0.01 0.15 0.25 0.35 0.0010.0020.0030.004 Strain,in./in. Strain,in./in. steel concrete Linear elastic Linear elastic range(线弹性范围) 间傍大学引目 assumption 亦2程学院 10 TONGI UNIVERSITY

Principle of superposition(叠加原则) " P P Pa +P2 =2N =3E Linear Ac2 4e1+42 →4.（线性） P P Pn+P2 P2=2E =3P Non-linear P1= 4(非线性) ≠△1+A2 @月浴大学 土亦2程学院 11 TONGJI UNIVEST System of units(单位制) The U.S.Customary System(USCS) (美国单位制) The international system of units(SI) (国际单位制) 同榜大学 土本2程学院 12 TONGJI UNIVERSITY OLFG法OF CIVIL ENGISEERG

Table A.1 Relationship between USCS and SI Units for Selected Quantities USCS Units SI Units Quantity Conversion Name Symbol Name Symbol foot t 1ft=0.3048m Lengh meter m inch in. 1in.=0.0254m pound Ib 11b=0.4536kg Mass kilogram kg kilopound kip 1kip=453.6kg pound b 1Ib=4.448N Newton, Force N kilopound kip kg.m/sec2 1kip=4.448kN pound/foot2 psf 1psf=47.88Pa Pascal, Pressure N/m2 Pa pound/inch2 psi 1psi=6895Pa 同海大学 土水2程学院 13 ONGII UNIVERSITY Concluding remark Assumptions principles =>Simplification(简化) 同膀大学 土本2程学院 14 TONGJI UNIVERSITY