5-1梁的挠度及转角18.ppt

Displacements of Bending Beam;§5-1 Deflection and Slope of Beam;1.弯曲变形的弊与利;1.弯曲变形的利弊; ;;;3.挠度和转角方程（Equation of  Deflection and slope） ;5. EXAMPEL;结论：梁截面的转角等于挠曲线y对于位置坐标 x的一阶导数。;2、建立挠曲线微分方程;3 积分法计算梁的位移;③中间铰;外伸梁B端—连续条件;例5-1：求悬臂梁B截面的转角和B截面挠度，设 ：梁长为L，EI = 常数 。; EI y′= ? = F(Lx - x2/2) + CEI y = FLx2/2 - Fx3/6 + C x + D; 例5-2 图示一弯曲刚度为EI的简支梁，在全梁上受集度为q的均布荷载作用。试求梁的挠曲线方程和转角方程，并确定其最大挠度和最大转角。;;EXAMPLE 5-3 图示一弯曲刚度为EI的简支梁，在D点处受一集中荷载作用。试求梁的挠曲线方程和转角方程，并确定其最大挠度和最大转角。;§5-3 按叠加原理计算梁的挠度及转角;1. 叠加原理的适用范围;例：简支梁受集中力和集中力偶。求：A、B两端转角和中点挠度。;;例5-5：简支梁在半跨度上作用荷载q，求梁中点的挠度。;;EXAMPLE 求图示梁的最大转角和最大挠度。;;;例：计算悬臂梁的挠度yc。;B;作业;6J2F:B=t(q$mZiVfRbO7K4H0D.z`w-s*o!lXhUdQaN6J3F:Cy@u)r%n#jWgScP9L5I1E;A~x+t(p$mYiVfRbO7K4G0Dz`v-so!lXhUdQaM6J2F:By=u)r%n#jWgScP8L5H1E.A~w+t(p$mYiVeRbN7K3G0Cz`v-so!kXhTdQ9M6I2F:By=u)q%nZjWfScO8L5H1E.A~w+t*p$lYiUeRaN7K3G0Cz@v-ro#kXgTdQ9M6I2F;Bx=u(q%mZjWfScO8L4H1D.A`w+s*p$lYiUeRaN7J3G:Cy@v)ro#kXgTdP9M5I2E;B~x=u(q%mZjVfSbO8K4H0D.A`w+s*p!lYhUeQaN6J3G:Cy@v)rn#kWgTcP9L5I2E;B~x=t(q$mZiVfRbO8K4H0D.z`w-s*o!lXhUeQaN6J3F:Cy@u)r%n#kWgTcP9L5I1E;A~x+t(p$mZiVfRbO7K4G0Dz`v-s*o!lXhUdQaM6J2F:By@u)r%n#jWgScP8L5H1E;A~x+t(p$mYiVeRbN7K4G0Dz`v-so!kXhTdQ9M6J2F:By=u)q%nZjWfScP8L5H1E.A~w+t*p$lYiVeRbN7K3G0Cz@v-ro!kXhTdQ9M6I2F;Bx=u(q%nZjWfScO8L4H1D.A`w+t*p$lYiUeRaN7J3G:Cz@v-ro#kXgTdP9M5I2F;Bx=u(q%mZjVfSbO8K4H1D.A`wo!kXhTdQ9M6I2F;Bx=u)q%nZjWfScO8L4H1D.A`w+t*p$lYiUeRaN7J3G:Cz@v-ro#kXgTdP9M5I2F;Bx=u(q%mZjVfSbO8L4H1D.A`w+s*p!lYhUeQaN7J3G:Cy@v)rn#kWgTdP9M5I2E;B~x=t(q$mZjVfSbO8K4H0D.z`w-s*p!lYhUeQaN6J3F:Cy@u)rn#kWgTcP9L5I1E;A~x=t(q$mZiVfRbO7K4G0D.z`w-s*o!lXhUdQaM6J3F:Cy@u)r%n#jWgScP8L5I1E;A~x+t(p$mYiVeRbO7K4G0Dz`v-so!kXhUdQaM6J2F:By=u)q%n#jWgScP8L5H1E.A~w+t*p$mYiVeRbN7K3G0Cz@v-so!kXhTdQ9M6I2F;By=u)q%nZjWfScO8L4H1E.A~w+t*p$lYiUeRaN7J3G0Cz@v-ro#kXgTdP9M6I2F;Bx=u(q%mZjVfScO8L4H1D.A`w+s*p!lYiUeRaN7J3G:Cy@v)rn#kXgTdP9M5I2E;B~x=t(q%mZjVfSbO8K4H0D.z`w+s*p!lYhUeQaN6J3F:Cy@v)rn#kWgTcP9L5I1E;B~x=t(q$mZiVfRbO7K4H0D.z`w-s*o!lXhUdQaN6J3F:Cy@u)r%n#jWgTcP9L5I1E;A~x+t(p$mYiVfRbO7K4G0Dz`v-so!lXhUdQaM6J2F:By=u)r%n#jWgS