论文部分内容阅读
为了研究新型结构预应力波形钢腹板组合槽形梁的抗扭性能,基于约束扭转理论,推导了波形钢腹板组合槽形梁的约束扭转翘曲应力表达式和扇形惯性矩;考虑了波形钢腹板的褶皱效应对纵向刚度的影响,计入波形钢腹板的剪切变形对约束扭转刚度的降低,得到了扇形惯性矩修正公式;最终建立了集中扭矩作用下的扭转角计算公式。完成了2片波形钢腹板组合槽形试验梁的偏载试验和3片相同梁的对称加载试验,试验表明:90 k N以内的偏载作用下,试验梁的荷载-位移曲线基本呈线性;试验梁两侧竖向位移的平均值与对称荷载作用下的竖向位移基本相同;试验梁的偏载系数位于1.2~1.3,比波形钢腹板组合箱梁增大10%左右。理论计算、试验测试和有限元分析表明:该文建立的扭转角计算公式采用修正过的扇形惯性矩进行计算,具有良好的精度。
In order to study the torsional behavior of the new type of prestressed corrugated steel webs with corrugated steel webs, the constrained torsional warping stress and moment of inertia of the corrugated steel webs with corrugated steel webs are deduced based on the constraint torsion theory. The influence of the corrugation effect on the longitudinal stiffness of the steel web is taken into account. The shear torsional stiffness of the corrugated steel web is reduced and the correction formula of the moment of inertia is obtained. Finally, a formula for calculating the torsion angle under the concentrated torque is established. The partial load test and the symmetrical load test of three identical beams with two corrugated steel webs are completed. The experimental results show that the load-displacement curve of the test beam is almost linear under the partial load of 90 kN ; The average value of vertical displacement on both sides of the test beam is basically the same as that of the vertical displacement under the symmetrical load; the partial load coefficient of the test beam is between 1.2 and 1.3, which is about 10% larger than that of the corrugated steel web. Theoretical calculations, experimental tests and finite element analysis show that the torsion angle calculation formula established in this paper is based on the corrected moment of inertia of the fan and has good accuracy.