4ijŶջߴb?l?4m?10md?2mض??19kNm3Fk?4000kNMk?2800kN?mԼƵڻϺ͵ʱĻѹ
⡿ 1ڻʱ
F?Gk4000?4?10?2?204000?1600pk?k???140kPa
A4?1040M2800pkmax?pk?k?140??140?105?245kPa
1W2?10?46Mpkmin?pk?k?140?105?35kPa
W2ڻʱ
F?Gk4000pk?k??100kPa
A4?10e?M280011??0.7m?b??4?0.67m Fk400066ԵѹΪ
pkmax?2?Fk?Gk?3la?2?4000?346.6kPa
?4?3?10???0.7??2?
5ijߴb?l?4m?2md?2mض??20kNm3ƫFk?680kNƫľe'?1.31mԼƽѹͱԵѹ
F?Gk680?4?2?2?20680?320⡿ pk?k???125kPa
A4?28FkƫľΪe'?1.31mFk?GkƫľΪe 680?1.31??680?320?ee?0.89m
11e?0.89m?b??4?0.67m
66pkmax?2?Fk?Gk?3la?2?1000?300.3kPa
?4?3?2???0.89??2?37
6.ijǽd?1.8mӦںЧӦϴ
Fk?280kNmΧض??18kNm3ػΪɰ
ֵfak?170kPaȷĿȡ ⡿ȣ
pk?F?GkFk??dAFk?Gk ??faA?kfafaAA?Fkfafak
fa??dFk280??2.09mȡb?2m
fa??d170?20?1.8A?ػֵ
ػΪɰ?b?3?d?4.4
b?2m?3m3m
fa?fak??b?(b?3)??d?m(d?0.5)?170?4.4?18??1.8?0.5??170?103?273kPa
ػ
F?Gk280?2?1.8?20pk?k??176kPa?fa?273kPaԣ̫
b2ȸΪ1.5m
F?Gk280?1.5?1.8?20pk?k??222.7kPa?fa?273kPa㡣
b1.5
7ij¸ֽd?1.2m߶0.45mΧض??18kNm3ӦںЧӦϴ
Fk?380kNMk?38kN?mڻˮƽFH?32kNΪ
e?0.8IL?0.84fak?190kPaȷijߴ硣 ⡿ĺس
A?Fk380??2.3m2
fa??d190?20?1.2ƫĺأA20%
38
A?1.2?2.3?2.76m2
賤n?lb?22b2?2.76b?1.16mȡb?1.2ml?2.4m
Gk?1.2?2.4?1.2?20?69.12kN
ػֵ
fa?fak??b?(b?3)??d?m(d?0.5)
e?0.8IL?0.84eILС0.85?b?0.3?d?1.6 fa?190?1.6?19?(1.2?0.5)?190?9?21.3?211.3kPa
ػ
F?Gk380?69.12pk?k??155.9kPa?fa?211.3kPa㡣
A1.2?2.4 ƫľe?M38?32?0.4552.411???0.117m?b??1.2?0.2m Fk380?69.12449.1266Mk52.4?155.9??155.9?51?246.9kPa1W?2.4?1.22㡣 6?1.2fa?1.2?211.3?253.5kPapkmax?pk?
8ijǽλǽ0.4md?1.2mΧض??18kNm3ӦںЧӦϴ
Fk?290kNmMk?10.4kN?mΪ?c?11% fak?140kPa
Ƹû ⡿1ȷ
ѹ
b0?Fk290??2.13m
fa??Gd140?20?1.2ƫĺأb20%b?1.2b0?1.2?2.13?2.6m
Fk?Gk290?2.6?1.2?20??135.5kPa b2.6ػֵ pk?fa?fak??b?(b?3)??d?m(d?0.5)
39
?c?11%?10% ?b?0.3?d?1.5
fa?140?1.5?18?(1.2?0.5)?140?18.9?158.9kPa pk?135.5kPa?fa?158.9kPa㡣
Mk10.4?135.5??135.5?9.2?144.7kPa1W?1.0?2.62㡣 6?1.2fa?1.2?158.9?190.7kPapkmax?pk?2ȷ߶
߶0.35mЧ߶h0?0.35?0.04?0.31m C15ft?0.91MPaֽfy?210MPa
bb'2.60.4b1?????1.1m
2222ػ
FM29010.4pj,max?k?k???111.5?9.2?120.7kPa
bW2.61?1.0?2.626FMpj,min?k?k?111.5?9.2?102.3kPa
bWǽߴpj??102.3?pj??2.6?1.1??2.6?120.7?102.3??110.1kPa
11pj,max?pj?????120.7?110.1??115.4kPa ?22ǽߴV?pjlb1?115.4?1.0?1.1?127kN
0.7ftlh0?0.7?0.91?106?1.0?0.31?197?103N?197kN?V?127kN㡣
3
M??12?2G???a1??2l?a'??pmax?p??p?pl ??max??12?A???λl?a'?1.0mǽ壬a1?b1
pkmax?135.5?9.2?144.7kPapkmin?135.5?9.2?126.3kPa
2.6?1.1???ǽߴp?126.3?2.6
?144.7?126.3??136.9kPa
40