同济大学：《结构力学》课程教学资源（教案讲稿，打印版）09 More Basic Concepts of Structural Analysis

Chapter 9. More Basic Concepts of Structural Analysis. 5 月大学 土工程学院 TONGJIUNIVERSITY 9.1 requirements and limitations of equilibrium Ma 50kN/m Rax Ray Rby & 2500 10m 500 、 2000 Ray=+400 400 R+312.5 1500 300 M Ray + Rby = 500 1000 200 8+ 100 Mat - 10Rby =-2500 点 Ray o 0 1 100 300 400 500 Re -500-100 Ray=500-Rby Ma=-625 -1000-200 -1500-300 Mat =-2500 + 10Rby 月大学 M=-1500 TONGJI UNIVERSITY

9.3 requirements and limitations of compatibility 50 kN/m 2500kNm(-】 =62500kN:m3( 500kN 10m △b=△b1+△b2=0 (a) 333Rbv 62500 El El 4b2=333R6m3 El Rb时 R=+187.5kN b 9.9 behavioral characteristics of statically indeterminate structures Greater stiffness (e) 土亦工程学院

1b) Lower stress intensities (e) 艾产 仙 5 Crack. Precluding failure 6 (a) (b)

A support settlement will induce bending moments. Hinge 城 城 城 (a) 城 (a) 麻 品 城 (b) 城 b 同海大学 目 土亦工程学院 TONGI UNIVERSITY