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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?1.8mӦںЧӦ׼ϴ

Fk?280kNmΧض??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߶0.45mΧض??18kNm3ӦںЧӦ׼ϴ

Fk?380kNMk?38kN?mڻˮƽFH?32kNΪ

e?0.8IL?0.84fak?190kPaȷijߴ硣 ⡿ĺس

A?Fk380??2.3m2

fa??d190?20?1.2ƫĺأA20%

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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?1.2mΧض??18kNm3ӦںЧӦ׼ϴ

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)

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?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?0.91MPa񼶸ֽfy?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

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