Lesso
1I
troductio
toMecha
icsofMaterials材料力学材料强度应变应力变形mecha
icsofmaterialsstre
gthofmaterialsaxiallyloadedbars
伸长，延长elo
gatio
Lesso
2TypesofBeamsa
dStressResulta
tsi
Beams横截的tra
sverse对称symmetry弯曲be
di
g不对称的u
symmetricalasymmetrical销轴pi
滚轴roller移动tra
slate水平地horizo
tally支撑，支持sustai
嵌住的builti
悬臂梁ca
tilever悬臂overha
g均匀的，一致的u
iformly力偶couple约束restrai
t柔性的flexible法向的，正态
ormal图像diagram对称轴axisofsymmetry简支梁simplysupportedbeamsimplebeam集中力co
ce
tratedforce分布力distributedload均布荷载u
iformlydistributedload
静力学平衡方程跨度，区间spa

equatio
ofstaticequilibrium
竖向verticaldirectio
应力分布distributio
ofstresses弯矩be
di
gmome
t静定staticallydetermi
ate水平约束horizo
talrestrai
tLesso
3Pri
cipalStressesi
Beams法向应力剪应力横截面中性轴主应力force主压应力主拉应力正交曲线应力迹线应力等值线局部效应应力集中大小，数量矩形的相交腹板compressivepri
cipalstresste
silepri
cipalstressorthogo
alcurvesstresstrajectorystressco
tourlocalizedeffectsstressco
ce
tratio
mag
ituderecta
gulari
tersectweb
ormalstressshearstresscrosssectio
eutralaxispri
cipalstressbe
di
gmome
ta
dshear
轴向受力杆件strai
stress
deformatio
criticalloadprismaticbarfreebodycrosssectio
ce
troid
临界荷载等直杆件隔离体截面形心
拉压剪te
sio
compressio
shear轴力axialforce拉力te
sileforce
弯矩M和剪力V
无量纲的量
o
dime
sio
alqua
tity可变形的deformable装配，集合assembly推论derivatio
方程equatio
性能property棱柱的prismatic液体静力学的hydrostatic集度，强度i
te
sity合力resulta
t静力学statics
f连接角缝连续梁轴向变形销轴支承辊轴支承静不定次数多余的叠加、迭加旋转角正弯矩形心间距惯性矩中间的有利的同时的协调一致Displaceme
ts单位荷载法：简单桁架静定静
ju
ctio
filletco
ti
uousbeamaxialdeformatio
spi
supportrollersupportthedegreeofstaticali
determi
cyredu
da
tsuperpositio
a
glesofrotatio
positivebe
di
gmome
tce
troidaldista
cei
ertiai
termediateadva
tageoussimulta
eouscompactibility
共线反向力forces虚功相对位移扭转力偶与。。一致。笼统地互等定理位移。。。线弹性结构相应的概念迭加原理应变能线性地按顺序根据滑模（施工）凸出物，凸部凹部挤压成型构statically企口，沟，槽厚板弯，起拱膨胀
colli
eara
doppositelydirectedvirtualworkrelativedisplaceme
ttwisti
gcouplecorrespo
dtoi
age
eralizedse
sereciprocaltheoremsrecipr