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用等弯矩法来确定塔吊水平臂单吊点位置的方法,已有不少文章作了介绍,读后很有启发,但觉得还存在两个问题: 1.在所见文章中,都认为臂架根部的铰点与吊点是位于臂架形心线上的,这样,在导出的确定吊点位置的计算方法中,不能反映出臂架根部铰点水平反力(臂架内部轴力)产生的端弯矩对吊点位置的影响。此外,小车牵引机构的自重对吊点位置的影响也没有考虑。故不符合臂架的实际受力状况(除去作用在臂架上的风力、惯性力和钢丝绳的张力)。
The method of determining the single-lift point of the horizontal arm of the tower crane by the method of constant bending moment has been introduced in many articles. After reading it, it is inspiring, but I think there are still two problems: 1. In the articles I have seen, I believe that The hinge and lifting points at the base of the boom are located on the centroid of the boom. In this way, the horizontal reaction force of the joint at the root of the boom cannot be reflected in the derived calculation method for the determination of the suspension point (the internal axial force of the boom ) The effect of the resulting bending moment on the position of the lifting point. In addition, the influence of the self-weight of the traction mechanism of the trolley on the position of the hanging point is not taken into consideration. It does not meet the actual force conditions of the jib (removing the wind force, inertia force, and tension of the wire rope acting on the jib).