第1章 绪 论
1.1 题
1)承受总纵弯曲构件:
连续上甲板,船底板,甲板及船底纵骨,连续纵桁,龙骨等远离中
和轴的纵向连续构件(舷侧列板等)
2)承受横弯曲构件:甲板强横梁,船底肋板,肋骨
3)承受局部弯曲构件:甲板板,平台甲板,船底板,纵骨等
4)承受局部弯曲和总纵弯曲构件:甲板,船底板,纵骨,递纵桁,龙
骨等
1.2 题
甲板板:纵横力(总纵弯曲应力沿纵向,横向货物或上浪水压力,横向
作用)
舷侧外板:横向水压力等骨架限制力沿中面
内底板:主要承受横向力货物重量,骨架限制力沿中面为纵向力 舱壁板:主要为横向力如水,货压力也有中面力
第2章 单跨梁的弯曲理论
2.1题
设坐标原点在左跨时与在跨中时的挠曲线分别为v(x)与v(x1)
M0x2Nx31)图2.1 v(x)???2EI6EI原点在跨中:v1(x1)?v0?201l4p(x?l)34?6EI31l2p(x?l)32?6EI3l4p(x?3l)34 6EIMxNx??2EI6EI23l4?v1(l)?0v1'(l)?0p(x?l)3224,? ?p'6EI?v1(0)?0N1(0)??22)图2.2v(x)??0x?NxMx??2EI6EIl3p(x?l)33 6EIp(x?l)32 6EI1??113?(?2?)? ?4??41623)图2.33xqxdxNx3v(xx)??0xx????06EI6EIl22.2题
pl3?1131?pl3(3???)?? a) v1?vpp?vp??6EI?16444?6EI3pl =
512EI
3pl V2?3?1?91?13?pl3pl ?????()??6EI?192EI96EI?4?162?4? 1
?MlMl2Pl29??(1?2) b) v(0)?33EI6EI6EI'20.1Pl25Pl2??73Pl =?
1620EI6EI3?27EI?MlMl2Pl29??(1?1) ?(l)?33EI6EI6EI20.1Pl24Pl2?107Pl?? =?
1620EI6EI3?27EI?l??2l?p????l233?1? vl??????3?1???m2?1?m1?1?
333?3EIl6EI?3??22??????237pl =
2430EI
7ql444ql5ql3 c) vl ???2192EI768EI2304EI??'qlpl v(0)???24EI16EI32?ql2166EI?l?ql?111?ql3 ?????96EI8EI?3612?3d)2.1图、2.2图和2.3图的弯矩图与剪力图如图2.1、图2.2和图2.3
图2.1
2
图2.2
图2.3
2.3题
1)
Mlql32l2?右???6EI24EI45EI?M?13q1l2120?l?Mlq?q?0??21???23EI??
q1l3Ml7l2?? 2)?0??3EI24EI180EI?l?Mllq1?? ?26EI??q1l3?1q1l31713??? = ??????EI?18243606?120?80EI2.4 题
图2.5
v(x)?v0??0x?N0x36EI,
v0?A?p?N0?
?x3??v(x)?Ap??0x???A?N0
?6EI?
3