dd等截面直杆的弯矩和剪力.ppt

表10-1 等截面直杆的弯矩和剪力,N,梁的简支图,弯矩,剪力,M,AB,MBA,QAB,QBA,1,l,a,b,A,B,-pab,l*l,a=b=l/2,-PL/8,2,Pab/l,2,2,pb,2,(l+2a),l,3,pb,(l+2b),l,3,2,Pl/8,P/2,-p/2,2,3,l,EI,A,B,=1,l,A,B,l,4i,i=EI/l,下同,2i,-6i/l,-6i/l,-6i/l,-6i/l,12i/l,2,12i/l,2,4,5,A,B,l,A,B,l,q,q,a,-ql,2,12,ql,2,12,ql,2,-ql,2,_qa,2,l,3,(6l-8la+3a),2,2,_qa,l,2,(4l-3a),3,-qa,3,3,3,3,3,2l,(2l-a),qa,2l,(2l-2la+a),2,12,12,7,9,M,l,a,b,A,B,l,A,B,=1,3i,0,-3i/l,-3i/l,Mb(3a-l),l,2,Ma(3b-l),l,2,-M6ab,l,3,-M6ab,l,3,a,b,A,B,L,0,当 a=b=l/2时 -3Pl /16,0,11p /16,-5p /16,12,11,-ql2/8,0,5ql/8,-3ql/8,编号,弯矩,剪力,MAB,MBA,QBA,QAB,梁的简图,A,B,L,q,a,-qa2/24(4 -3a/l+3a2/5l2),0,Qa/8(4 -a2/l2+a3/5l3),-qa3/8l2(1-a/5l),当a=l时, -ql2/15,0,4ql/10,-ql/10,a,b,M(l2-3b2)/2l2,0,-M3(l2-b2)/2l3,-M3(l2-b2)/2l3,当a=l时,M/2,MB左A=M,-M (3/2l),-M (3/2l),13,15,.,编号,梁的简图,弯矩,剪力,MAB,MBA,QBA,QAB,i,-i,0,0,.,A,B,-pa/2l(2l-a),-pa2/2l,p,0,p,0,当a=l / 2时,-3p l / 8,-p l/8,18,.,19,A,B,20,QB左A=p,QB右A=0,-p l/2,-p l/2,p,-q l2/3,-q l2/6,ql,0,