结构力学-力法习题.ppt

X1X2X3X4确定图示结构的超静定次数X1X2X3X4X1X2X37-1

X1X5X3X2X4X6X1X2X3X4X5X6X1X2X3X4X4X5X1X2X3X4X5

X1331111X1X2X3X4X5X5X6X6X10X7X8X8X9X9

FABEIX1F基本体系X1＝11F7-2

FEIEIABCX1＝1X1＝11X1基本体系X1FF7-3

6m3mI5IABX1基本体系X1=139981924.479.51M(kN)7-4

ABCEI=常数X1=1X2=1X1X2基本体系7-5

X1=1X2=1

ABCEI=常数CD－C－－7-5

10m6mABCDX1X166187.562.562.5187.57-6

3m3m3m3m56kNEI=常数56kN基本体系X1X1X2X2X1＝166X2=13356kN1688497.534.518187-7

X12m2m3m3m4kNEI＝常数4kNX1基本体系X1＝11.510331212124.87.27-8

AIIAlll/2ABCDF设A=10I/l2，按去掉CD杆和切开CD杆建立根本方程。IIlll/2ABCDFX1基本体系ABCDX1＝1ABCDF0.117Fl-0.769F7-12

IIAlll/2ABCDFIIlll/2ABCDFX1基本体系ABCDX1＝1ABCDFA→∞时A→0时7-12

绘制图示结构的弯矩图2III9m6m20kN10kN10kN10kN10kN10kNX110kN基本体系X1＝14.54.56026.733.326.733.37-16

X1X2基本体系X1=11X2=111603007-22

3111()58.11101.8959.6940.317.36○+○+○_○_B

ABCX1基本体系X1＝1l-1-17-26

10（）

FX1基本体系aaaABCDFX1＝12aF3aFaFaF0.46aF7-33

aF0.46aF1F0.27F1.27F1

aaaABCDF1X1=1X1基本体系

X1X2X3X4