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工业厂房结构处于扭矩作用下的情况是不少的,如吊车梁、托梁和托架……等。预应力混凝土吊车梁和托梁在弯矩、剪力、和扭矩共同作用下,由于扭矩和弯矩的比值较小,扭矩对梁的抗弯刚度影响不大,大量试验和工程实践说明梁的挠度和扭转角不起控制作用。托架结构在偏心荷载作用下如图1所示,杆件往往处于轴力、弯矩和扭矩共同作用,对于下承式托架如图1(b)所示,下弦中间杆件尚有剪力,对于预应力混凝土杆件尚有预压力共同作用。要分析杆件内力,就需要知道杆件的抗扭刚度、轴力刚度和抗
There are many situations in the industrial plant structure under the effect of torque, such as crane beams, joists and brackets...etc. Prestressed concrete crane girder and joist under the joint action of bending moment, shear force and torque, due to the smaller torque and bending moment ratio, the torque has little effect on the bending stiffness of the beam, a large number of experiments and engineering practices illustrate the beam’s Deflection and twist angle have no control. The bracket structure under the action of eccentric load is shown in Fig. 1. The rod members are often combined with axial force, bending moment and torque. For the lower bracket, as shown in Fig. 1(b), the lower middle member still has shears. Force, pre-stressed concrete rods still have pre-stress together. To analyze the internal force of the rod, it is necessary to know the torsional stiffness, axial stiffness and resistance of the rod.