12
鏉愭枡鍔涘
涓�銆佸～绌?/p>
1
銆佸浘鎵�绀烘鏋朵腑锛屾按骞虫潌鐪嬩綔鍒氭�э紝涓夋牴绔栨潌闀垮害鐩稿悓锛屾í鎴潰绉潎涓?/p>
A
锛屾潗鏂欑浉鍚岋紝灞堟湇
鏋侀檺涓?/p>
飦?/p>
y
锛庡綋涓夋潌鍧囧浜庡脊鎬ч樁娈垫椂锛屽悇鏉嗚酱鍔涗箣姣斾负
N
1
:
N
2
:
N
3
=5:2:-1
锛庡綋涓夋潌涓湁涓�鏉嗗紑
濮嬪眻鏈嶆椂锛岃嵎杞?/p>
P
鐨勫�间负
(
1.5
飦?/p>
y
A
)
锛?/p>
2
銆佷竴绛夋埅闈㈠渾鐩存潌锛岄暱搴︿负
l
锛岀洿寰勪负
d
锛屾潗鏂欑殑寮规�фā閲忎负
E
锛岃酱鍚戝彈鍘嬪姏
P
锛屽湪寮规�ц寖鍥?/p>
鍐咃紝
鍏舵渶澶у垏搴斿姏涓?/p>
锛?/p>
2
P
/
飦?/p>
d
2
锛?/p>
锛?/p>
鍙楄浇鍚庣殑闀垮害涓?/p>
锛?/p>
l
-4
lP
/
飦?/p>
Ed
2
锛?/p>
锛?/p>
鍙楄浇鍚庣殑鐩村緞涓?/p>
锛?/p>
d
+4
飦?/p>
P
/
飦?/p>
Ed
锛?/p>
锛?/p>
鏉嗕欢鍐呯殑搴斿彉鑳戒负锛?/p>
2
P
2
l
/
飦帮亝
d
2
锛?/p>
銆?/p>
3
銆?/p>
澶栧緞
D
= 55 mm
锛?/p>
鍐呭緞
d
= 45 mm
鐨勯挗绠★紝
涓ょ閾版敮锛?/p>
鏉愭枡涓?/p>
Q235
閽紝
鎵垮彈杞村悜鍘嬪姏
F
銆?/p>
鍒欒兘浣跨敤娆ф媺鍏紡鏃跺帇鏉嗙殑鏈�灏忛暱搴︽槸锛?/p>
1.78m
锛?/p>
锛屽綋鍘嬫潌闀垮害涓轰笂杩版渶灏忛暱搴︾殑
4/5
鏃讹紝鍘?/p>
鏉嗙殑涓寸晫搴斿姏涓猴紙
188.5kN
锛?/p>
銆?/p>
宸茬煡锛?/p>
E
= 200 GPa
锛?/p>
飦?/p>
p
= 200 MPa
锛?/p>
飦?/p>
s
= 240 MPa
锛岀敤鐩寸嚎鍏紡鏃讹紝
a
= 304 MPa
锛?/p>
b
=1.12
MPa
銆?/p>
4
銆佷竴绛夌洿鍦嗘潌锛岀洿寰勪负
d
锛岄暱搴︿负
l
锛屼袱绔悇浣滅敤涓�鎵煩
T
锛屾潗鏂欑殑娉婃澗姣斾负
飦?/p>
锛屽脊鎬фā閲忎负
E
銆傚垯涓ょ闈㈢殑鐩稿杞涓猴紙
64(1+
飦?/p>
)
Tl
/
飦?/p>
Ed
4
锛?/p>
锛屾潌浠跺唴鍌ㄥ瓨鐨勫簲鍙樿兘涓猴紙
32(1+
飦?/p>
)
T
2
l
/
飦?/p>
Ed
4
锛?/p>
锛?
鍙堣嫢涓ょ鍚勪綔鐢ㄤ竴寮煩
M
锛?/p>
鍒欐寜绗笁寮哄害鐞嗚鏃讹紝
鍏跺嵄闄╃偣鐨勭浉褰撳簲鍔涗负
锛?/p>
2
2
3
32
M
T
d
飥?/p>
飦?/p>
锛?/p>
锛?
鎸夌鍥涘己搴︾悊璁烘椂锛屽叾鍗遍櫓鐐圭殑鐩稿綋搴斿姏涓猴紙
2
2
3
75
.
0
32
M
T
d
飥?/p>
飦?/p>
锛?/p>
銆?/p>
6
銆?/p>
鐭╁舰鎴潰姊侊紝
鏉愭枡鐨勬姉寮鐢ㄥ簲鍔?/p>
[
飦?/p>
]=8MPa
,
姊佸唴鏈�澶у集鐭?/p>
M
max
=24kNm
,
姊佹埅闈㈢殑楂樺姣?/p>
h
/
b
=1.5
.
鍒欐瀹?/p>
b
搴斿彇
(
20cm
).
7
銆佸渾鏌卞舰钂告苯閿呯倝鐨勫寰勪负
D
锛屽唴寰勪负
d
锛屽鍘氫负
t
锛岃嫢鏉愭枡鐨勮鐢ㄥ簲鍔涗负
[
飦?/p>
]
锛庡垯閿呯倝鑳芥壙
鍙楃殑鏈�澶у唴鍘嬪姏
(
宸ヤ綔鍘嬪姏
)
涓?/p>
(p=2[
飦?/p>
]t/d)
銆?/p>
8
銆佹鐨勫彈鍔涙儏鍐靛浜庝腑澶埅闈负鍙嶅绉帮紝濡傚浘銆傛涓ぎ鎴潰涓婄殑鍐呭姏
Qc=( 0 )
鍜?/p>
Mc=( 0 )