论文部分内容阅读
塔式起重机塔身主弦杆在吊重作用下,其受力可归结为:一个轴向压力N和一个弯矩M。在弯矩作用下,塔身要弯曲变形,端部要产生水平位移;而在塔身端部作用轴向压力N的情况下,弯矩要增加。弯矩增加,弯曲变形又要增加;变形增加,弯矩又要增加,形成非线性变形。结果,塔身端部的水平位移和根部的内应力会达到很大的值,甚至是不容许的。因此,计算塔身非线性变形引起的端部水平位移和根部内应力是很重要的。今应用矩阵表格法计算如下。
Tower crane tower chord in the role of hanging, the force can be attributed to: an axial pressure N and a bending moment M. Under the action of bending moment, the tower body should be bent and deformed, and the horizontal displacement should be produced at the end of the tower body. When axial pressure N is acting on the end of tower body, the bending moment should be increased. Bending moment increases, bending deformation also increases; Deformation increases, but also to increase the bending moment, the formation of nonlinear deformation. As a result, the horizontal displacement of the end of the tower and the root internal stress will reach a great value, or even not allowed. Therefore, it is important to calculate the horizontal displacement of the tip and the internal stress caused by the non-linear deformation of the tower. This application of matrix table method is calculated as follows.