工程力学吉林大学经典课件.ppt
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1、2019/3/30,Kylinsoft,Statics-Problems-1,第一部分 静力学,2019/3/30,Kylinsoft,Statics-Problems-2,作业题目,作业题目,2019/3/30,Kylinsoft,Statics-Problems-3,P23-1.1(l):,2019/3/30,Kylinsoft,Statics-Problems-4,P23-1.1(g):,2019/3/30,Kylinsoft,Statics-Problems-5,P24-1.2(k):,2019/3/30,Kylinsoft,Statics-Problems-6,P27-1.3(c):
2、,2019/3/30,Kylinsoft,Statics-Problems-7,P27-1.3(e):,2019/3/30,Kylinsoft,Statics-Problems-8,P58-2.3:,Solution:,由此得到如下方程组:,解得:,2019/3/30,Kylinsoft,Statics-Problems-9,P60-2.14:,Solution:,按定义有:,So, expressions (a), (d), (e) are valid.,2019/3/30,Kylinsoft,Statics-Problems-10,P61-2.20:,Solution:,(a),Vecto
3、r form:,2019/3/30,Kylinsoft,Statics-Problems-11,(b),Vector form:,2019/3/30,Kylinsoft,Statics-Problems-12,P63-2.28:,+,Solution:,2019/3/30,Kylinsoft,Statics-Problems-13,P63 -2.30:,(a),Solution:,2019/3/30,Kylinsoft,Statics-Problems-14,(b),+,2019/3/30,Kylinsoft,Statics-Problems-15,Original forces and co
4、uple can be reduced to a force and a couple acting at point O:,P64-2.32:,Solution:,于是得到合力的大小、方向和作用线位置(如图所示):,(或,或,),2019/3/30,Kylinsoft,Statics-Problems-16,P64-2.34:,+,Solution:,2019/3/30,Kylinsoft,Statics-Problems-17,P85-3.2:,Solution:,From the FBD of the beam in Fig:,+,2m,2019/3/30,Kylinsoft,Stati
5、cs-Problems-18,P86-3.11:,Solution:,把人和梯子作为研究对象,作出FBD,(a) x=1.5m,+,2019/3/30,Kylinsoft,Statics-Problems-19,(b),2019/3/30,Kylinsoft,Statics-Problems-20,P87-3.18:,Solution:,0.5m,(1) Studying entire structure,From the FBD of entire structure in Fig:,+,(2) Studying member AB,From the FBD of member AB in
6、Fig:,0.5m,1.6m,+,2019/3/30,Kylinsoft,Statics-Problems-21,(3) Studying member ACE,From the FBD of member ACE in Fig:,0.8m,A,E,C,0.8m,0.6m,0.6m,+,2019/3/30,Kylinsoft,Statics-Problems-22,P90-3.28(f):,Solution:,(1) Studying member CD,From the FBD of member CD in Fig:,显然,本题中在约束A、B、C、D处没有水平方向的作用力,M,C,3m,1
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