材料力学 华南理工大学出版社 习题答案.docx

材料力学华南理工大学出版社习题答案材料力学习题部分答案2-1(a)N1=20KN(b)N1=P;N2=2P2-2max=150aMP2-3BC=76.4aMP2-4=31.9aMP2-5G=37.1KN2-6a69mm2-8d18mm；A8332mm；P15.7KN2-10E=204aGP；=0.3172-11P=21.6KN2-14=26.560；P=50KN2-15总l?=0.017mm2-16=158.4aMP；BV?=7.2mm2-17x=0.6m；P200KN2-21A22.60cm22-22AB=108.3aMP；BC=8.3aMP；CD=141.7aMP2-24铜杆1=225aMP；钢杆2=375aMP；?L2=3.75mm2-25=-100.7aMP；3-3d=33mm；=70.7aMP3-4=15.9aMP3-5jy=134.7aMP3-6P=176.7N；=17.6aMP3-7=136.8aMP；jy=171.0aMP；1=2171.9aMP3-8l=406mm4-1(a)43;88;+91;+54(单位:N?m)4-2max1=78.5aMP；max2=43.3aMP；max3=82.5aMP4-3max1=191.7aMPmax2=158.8aMPmax=191.7aMP4-71.44倍和2.33倍4-8d=48.5mm；d2=57.8mm4-9d=21.6mm；Q=1.12KN4-10max1=49.4aMP；max1=1.770/m；max321.3aMP；max2=0.440/m注：3N由3KW改为30KW4-11D=63mm4-12d1=84.6mm；d2=74.5mm；d=85.0mm；主动轮安排在中间4-14?=GItl224-18max=62.2aMP；=115mm5-1(a)ZS=3223tbt+5-2(a)cy=119.3mm；(b)cy=146.7mm；cz=80mm；(c)；cy=115.7mm；cz=0.9mm5-3zI=164R；yzI=814R5-4(a)yI=zI=2.23×5104mmyzI=7.75×4104mm(b)zI=331bhyI=331hbyzI=422hb5-5(a)zcI=3.57×8104mm58005.76(对应于0y)；0zI7.606×5104mm；0yI1.994×5104mm6-1(g)1Q=1.67KN；1M=5KN；(l)1Q=30KN；1M=45KN；2Q=0；2M=40KN6-2(c)AQ=2qa；BQ=CQ=0；AM=q2a；BM=CM=q2a(k)CQ=qa；AQ=BQ=0；AM=0；BM=21q2a；CM=q2a6-4(h)AQ=0；BQ=CQ=qa；AM=q2a；BM=21q2a；CM=21q2a(m)AQ=0；BQ=qa；CQ=qa；0；AM=0；BM=0；CM=21q2a(t)AQ=CQ=61qa；BQ=DQ=65qa；AM=BM=0；CM=61q2a左DM=61q2a；右DM=65q2a6-6la=0.2077-1=352aMP7-2=105aMP7-3D=2.0dE7-4除纵向线应变不同外，其余一样。7-6(a)A=D=163aMP；B39aMP；C58.8aMP(b)A=D=18.5aMP；BC07-7截面:A=7.41aMP；B4.95aMP；C0；D=7.41aMP；截面：A=9.26aMP；B6.17aMP；C0；D=9.26aMP；7-8max=40.92aMP7-9容许弯矩之比：2:1抗弯刚度之比：4:17-10(1)(b)的最大正应力大于(a)的最大正应力(2)ZbW=9.43×410-3m；ZcW=9.87×410-3m；ZcZbWW7-21d=114.7mm7-22tn=5.4,en=15.07-23l32.1m7-24a=1.385m7-25a=2.12m；q=25KN/m7-26P28.9KN31.73KN7-27max=0.52aMP7-28P=3.94KN；max=9.45aMP7-29max=7.05aMP；max=0.48aMP7-31cy=368mm；zI=1.8567×9104mm；max=167.9aMP；max=77.32aMP7-3228a7-33b=14cm；h=21cm8-4y=EIlq1200(5x45lx+54l);2ly=EIlq38404948-5(a)Ay=()22312824lalaEIPa+()；B=()EIlaPa2+反时针(b)Ay=EIPl63()；B=EIPl892()?；(c)Ay=EIql164()；B=EIql123 (d)Ay=EIqa2454()；B=EIqa123()?8-61y=EI481(83Px-15xPl2+93Pl)；2y=EI121(3Px-3xPl2+23Pl)；Ay=EIPl1633()8-9刚度条件Ay=EI835解出zI10944cm；强度条件解出zW753cm；选用16号工字钢(E=200aGP)8-13(b)AR=ql167()；BR=ql1617()；AM2161ql8-14cR=0.828P()91x=6.37aMP；xy35.65aMP9-2(a)0120=17.5aMP；0120=21.6aMP；(b)060=62.5aMP；060=21.7aMP9-3030-=1.125aMP；030-=0.572aMP9-4b1=57aMP；2=0；3=7aMP；max=32aMP；0=03.19(c)060-=44.82aMP；060-=-5.67;1=45.62aMP；2=4.38aMP；3=0；max=20.62aMP；0=037"599-5(a)1=94.7aMP；2=50aMP；3=5.3aMP;max=44.7aMP(b)1=50aMP；2=20aMP；3=80aMP；max=65aMP(c)1=50aMP；2=50aMP；3=80aMP；max=65aMP9-6P=13.17KN9-71=0；2=19.8aMP；3=60aMP；=2.71×410-9-9(a)1r=20aMP；2r=26aMP；3r=50aMP；4r=45.8aMP(b)1r=31.9aMP；2r=38.5aMP；3r=53.9aMP；4r=46.9aMP9-10A点1=5.9aMP；2=0；3=-91.1aMP；Ar3=97aMP；Ar494.2aMPB点1=91.1aMP；2=0；3=5.9aMP；Ar3=97aMP；Ar494.2aMP9-13rM=46.4aMP10-3b=90mm；h=180mm10-6P=400N10-7D=315mm；max156.5aMP10-12maxc=1.88aMP；maxl=0.41aMP10-138倍10-18A=130.9aMP；B=75.3aMP10-19max10.54aMP；f=21mm10-22P788N10-234r=26.7aMP10-27d51.1mm11-2crP=345KN11-3P376.3KN11-4crP=236lEI=1.82dE×310-11-5f最大；d最小11-9P138N11-10P19.10KN11-11P51.6KN12-1(a)AH?=()EIMa16172；B=()?EIMa35(b)AV?=()EIPl12133；B=()?EIPl432 (c)AH?=()+EIqlEIPl4824312-4(a)PNCG22=；PNBD222-=；GDN=BGN=CDN=PNBC212-=；