1-1
銆佽嚜閲嶄负
P=100kN
鐨?/p>
T
瀛楀舰閽㈡灦
ABD,
缃簬閾呭瀭闈㈠唴锛岃浇鑽峰鍥炬墍绀恒�傚叾涓浆鐭?/p>
M=20kN.m
锛屾媺鍔?/p>
F=400kN,
鍒嗗竷鍔?/p>
q=20kN/m,
闀垮害
l=1m
銆傝瘯姹傚浐瀹氱
A
鐨勭害鏉熷姏銆?/p>
1-2
濡傚浘鎵�绀猴紝椋炴満鏈虹考涓婂畨瑁呬竴鍙板彂鍔ㄦ満锛屼綔鐢ㄥ湪鏈虹考
OA
涓婄殑姘斿姩鍔涙寜姊舰鍒嗗竷锛?
1
q
=60kN/m
锛?/p>
2
q
=40kN/m
锛屾満缈奸噸
1
p
=45kN
锛屽彂鍔ㄦ満閲?/p>
2
p
=20kN
锛屽彂鍔ㄦ満铻烘棆妗ㄧ殑鍙嶄綔鐢?
鍔涘伓鐭?/p>
M=18kN.m
銆傛眰鏈虹考澶勪簬骞宠 鐘舵�佹椂锛屾満缈兼牴閮ㄥ浐瀹氱
O
鎵�鍙楃殑鍔涖�?/p>
1-3
鍥剧ず鏋勪欢鐢辩洿瑙掑集鏉?/p>
EBD
浠ュ強鐩存潌
AB
缁勬垚锛?/p>
涓嶈鍚勬潌鑷噸锛?/p>
宸茬煡
q=10kN/m
锛?/p>
F=50kN
锛?/p>
M=6kN.m
锛屽悇灏哄濡傚浘銆傛眰鍥哄畾绔?/p>
A
澶勫強鏀骇
C
鐨勭害鏉熷姏銆?/p>
1-4
宸茬煡锛氬鍥炬墍绀虹粨鏋勶紝
a, M=Fa,
1
2
F
F
F
飥?/p>
飥?/p>
,
姹傦細
A
锛?/p>
D
澶勭害鏉熷姏
瑙ｏ細
1-5
銆佸钩闈㈡鏋跺彈鍔涘鍥炬墍绀恒�?/p>
ABC
涓虹瓑杈逛笁瑙掑舰锛屼笖
AD=DB
銆傛眰鏉?/p>
CD
鐨勫唴鍔涖�?/p>
1-6
銆?/p>
濡傚浘鎵�绀虹殑骞抽潰妗佹灦锛?/p>
A
绔噰鐢ㄩ摪閾剧害鏉燂紝
B
绔噰鐢ㄦ粴鍔ㄦ敮搴х害鏉燂紝
鍚勬潌浠堕暱搴︿负
1m
銆?/p>
鍦ㄨ妭鐐?/p>
E
鍜?/p>
G
涓婂垎鍒綔鐢ㄨ浇鑽?/p>
E
F
=10kN
锛?/p>
G
F
=7 kN
銆傝瘯璁＄畻鏉?/p>
1
銆?/p>
2
鍜?/p>
3
鐨勫唴鍔涖�?/p>
瑙ｏ細
2-1
鍥剧ず绌洪棿鍔涚郴鐢?/p>
6
鏍规鏋舵瀯鎴愩�傚湪鑺傜偣
A
涓婁綔鐢ㄥ姏
F
锛屾鍔涘湪鐭╁舰
ABDC
骞抽潰鍐咃紝涓?/p>
涓庨搮鐩寸嚎鎴?/p>
45
o
瑙掋�偽?/p>
EAK=
螖
FBM
銆傜瓑鑵颁笁瑙掑舰
EAK
锛?/p>
FBM
鍜?/p>
NDB
鍦ㄩ《鐐?/p>
A
锛?/p>
B
鍜?/p>
D
澶勫潎涓虹洿瑙掞紝鍙?/p>
EC=CK=FD=DM
銆傝嫢
F=10kN
锛屾眰鍚勬潌鐨勫唴鍔涖�?/p>
2-2
鏉嗙郴鐢遍摪閾捐繛鎺ワ紝
浣嶄簬姝ｆ柟褰㈢殑杈瑰拰瀵硅绾夸笂锛屽鍥炬墍绀恒�傚湪鑺傜偣
D
娌垮瑙掔嚎
LD
鏂瑰悜
浣滅敤鍔?/p>
D
F
銆?/p>
鍦ㄨ妭鐐?/p>
C
娌?/p>
CH
杈归搮鐩村悜涓嬩綔鐢ㄥ姏
F
銆傚閾伴摼
B
锛?/p>
L
鍜?/p>
H
鏄浐瀹氱殑锛屾潌閲嶄笉璁★紝
姹傚悇鏉嗙殑鍐呭姏銆?/p>
2-3
閲嶄负
1
P
锛?/p>
980 N
锛屽崐寰勪负
r =100mm
鐨勬粴瀛?/p>
A
涓庨噸涓?/p>
2
P
锛?/p>
490 N
鐨勬澘
B
鐢遍�氳繃瀹氭粦杞?/p>
C
鐨勬煍缁崇浉杩炪�傚凡鐭ユ澘涓庢枩闈㈢殑闈欐粦鍔ㄦ懇鎿﹀洜鏁?/p>
s
f
=0.1
銆傛粴瀛?/p>
A
涓庢澘
B
闂寸殑婊氶樆绯绘暟涓何?/p>
=0.5mm
锛屾枩闈㈠�捐伪
=30o
锛屾煍缁充笌鏂滈潰骞宠锛屾煍缁充笌婊戣疆鑷噸涓嶈锛岄摪閾?/p>
C
涓哄厜婊戠殑銆傛眰
鎷夊姩鏉?/p>
B
涓斿钩琛屼簬鏂滈潰鐨勫姏
F
鐨勫ぇ灏忋�?/p>
2-4
涓や釜鍧囪川鏉?/p>
AB
鍜?/p>
BC
鍒嗗埆閲?/p>
1
P
鍜?/p>
2
P
锛?/p>
鍏剁鐐癸肌鍜岋迹鐢ㄧ悆閾板浐瀹氬湪姘村钩闈紝
鍙︿竴绔饥鐢?/p>
鐞冮摪閾剧浉杩炴帴锛岄潬鍦ㄥ厜婊戠殑閾呯洿澧欎笂锛屽闈笌
AC
骞宠锛屽鍥炬墍绀恒�傚
AB
涓庢按骞崇嚎鐨勪氦瑙?/p>
涓?/p>
45o
锛屸垹
BAC=90o
锛屾眰
A
鍜?/p>
C
鐨勬敮搴х害鏉熷姏浠ュ強澧欎笂鐐癸饥鎵�鍙楃殑鍘嬪姏銆?/p>
3-1
宸茬煡锛氬鍥炬墍绀哄钩闈㈡満鏋勪腑锛屾洸鏌?/p>
OA=r
锛屼互鍖�瑙掗�熷害
0
飦?/p>
杞姩銆傚绛?/p>
A
娌?/p>
BC
鏉嗘粦鍔ㄣ�?/p>
BC=DE
锛?/p>
涓?/p>
BD=CE=l
銆傛眰鍥剧ず浣嶇疆鏃讹紝鏉?/p>
BD
鐨勮閫熷害
飦?/p>
鍜岃鍔犻�熷害
飦?/p>
銆?/p>
瑙ｏ細
3-2
鍥剧ず閾伴摼鍥涜竟褰㈡満鏋勪腑锛?/p>
A
O
1
=
B
O
2
=100mm
锛屽張
2
1
O
O
=
AB
,
鏉?/p>
A
O
1
浠ョ瓑瑙掗�熷害
瑁?/p>
璁?/p>
绾?
瑁?/p>
璁?/p>
绾?/p>