?2?2k/1.625m?1.23k/m??1.109k/m

二十五． ?11??224l3l3?;?12??21?? 3EIEI?11m1?2X1??12m2?2X2?X1 ?21m1?2X1??22m2?2X2?X2 设 ??1 2?11m1?(1??)X1??12X2?0?11?21X1?(1??)X2?0?11

1???3/4?3/41???0 ?1?7/4;?2?1/4

?12?3EIEI32;??0.655EI/ml;??3;?2?1.732EI/ml3 12337mlmlX11X??1;12?1; X21X221314.5?106?8426.28; 二十六． ??3156?102??2??600?62.8; 60??1.88

A?0.0224?10?3?1.88?0.0224?10?3 m

N?55.33 kN