考虑次梁约束的工字形边榀主梁扭转分析

Torsional Analysis of I-Beam Considering Secondary Beam Restraint

工字形钢梁抗扭承载力及抗扭刚度均很弱,而承担扭矩情况较常见,当主梁单侧与次梁铰接连接时,由于连接偏心作用,次梁将对主梁产生偏心扭矩,该扭矩将对主梁产生的较大的扭转变形,剪应力往往会超过抗剪强度。考虑与之连接次梁对其的扭转约束作用,扭矩及扭转变形大大减小,也与实际情况相符。

The torsional bearing capacity and torsional stiffness of I-shaped steel beams are very weak.It is common to bear torque.When one side of the main beam is hinged with the secondary beam,the secondary beam will produce eccentric torque to the main beam because of connection eccentricity.The torque will cause large torsional deformation of the main beam.And the shear stress will exceeds the shear strength.Torque and torsional deformation will be greatly reduced when considered restraint effect of secondary beam on main beam.It is consistent with the actual situation.