97-臺電招考-專業2-問答8 - 土木
By Edith
at 2011-03-07T23:01
at 2011-03-07T23:01
Table of Contents
請教版上的高手:
97-臺電招考-專業2-問答8
已知4跨連續樑每跨各20M 圖形如下,E=2.04*10^6 ,I=2000 cm^4
a b c d e
2++++1++++1++++1++++1 (數字代表反力數)
於c支承下陷4.7cm ,求@a及@b與彎矩圖
我的作法:
1.取半分析
Mfcd=Mfdc=6EI△/(l*l)=6*2.04*10^6*2*10^3/(20*100)^2=28,764 kgf-cm
Mfba=-0.5Mfcb=-14,382 kgf-cm
2.Scd:Sde=4:3
3.力矩分配法
cd dc de
DF 4/7 3/7
MF 28764 28764 -14382
-6163.7 -8218.3 -6163.7
ΣM 24654.85 20545.7 -20545.7
想請教1-3的步驟是否正確?
--
97-臺電招考-專業2-問答8
已知4跨連續樑每跨各20M 圖形如下,E=2.04*10^6 ,I=2000 cm^4
a b c d e
2++++1++++1++++1++++1 (數字代表反力數)
於c支承下陷4.7cm ,求@a及@b與彎矩圖
我的作法:
1.取半分析
Mfcd=Mfdc=6EI△/(l*l)=6*2.04*10^6*2*10^3/(20*100)^2=28,764 kgf-cm
Mfba=-0.5Mfcb=-14,382 kgf-cm
2.Scd:Sde=4:3
3.力矩分配法
cd dc de
DF 4/7 3/7
MF 28764 28764 -14382
-6163.7 -8218.3 -6163.7
ΣM 24654.85 20545.7 -20545.7
想請教1-3的步驟是否正確?
--
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土木
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