应用广义阶梯函数解变刚度超静定梁的弯曲问题
Apply Generalized Step Function to Solve the Bending Problem of Statically Indeterminate Beams with Variable Flexural Rigidity
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摘要: 变刚度超静定梁的弯曲问题,可以近似的以受分段均布荷载(包括集中荷载、集中力偶)作用下的阶梯梁来代替.本文推广Heaviside函数{x-a}0的概念,定义一个新的函数{x-a}n,n=0,1,2…,称为广义阶梯函数,并给出{x-a}n{x-b}0的运算法则.然后将抗弯刚度的倒数1/EJ和弯矩方程M(x)都用{x-a}n来表示.代入挠曲线近似微分方程,从而建立一套适用于各类直梁弯曲问题的统一解法,并给出一般情况下挠曲线方程的通式.Abstract: The present paper defines a generalized step function {x-a}n and the reciprocal of bending rigidity of beams 1/EJ as well as the bending moment are expressed in such a form {x-a}n,Thus a general procedure for calculating the deformation of all types of straight beams is given and the general form of equation of elastic curve of beams is obtained.
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[1] 叶开沉,非均匀变厚度梁的弯曲,兰州大学学报(力学专号),(1)(1979). [2] Shames,I.H.,Mechanics of Deformable Solids,(1964) [3] Oden,J,T,Mechanscs of Elastsc Structures,(1967) [4] 米凯拉奇,111.E.《建筑力学的若干问题》,建筑工程出版社,(1956) [5] 杨叔子,机床两支承主轴部件静刚度的分析与计算,机床,总39期(1979)11页, [6] 费奥多谢夫,B.N.《材料力学》,高等教育出版社,(1965).
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