前言 桥式类型起重机的主梁由于沿截面的温度不均匀,常在主梁的垂直方向产生上拱或下挠,在水平方向产生弯曲变形;同时在长度方向也会伸缩变形。当温度恢复到均匀状态时,变形也逐渐消失,这一种变位称为温度变位。 主梁产生温度变位的原因,有的是由于在露天场地上安装或使用,有太阳照射,使主梁沿截面温度分布不均匀;有的是由于起重机用 Foreword Bridge type crane due to the cross-section of the main beam uneven temperature, often in the vertical direction of the main girder to produce the arch or down deflection in the horizontal direction of the bending deformation; the same time, the length of the telescopic deformation. When the temperature returns to a uniform state, the deformation also gradually disappear, this kind of displacement is called temperature displacement. The main reason why the temperature variation of the main girder is that some are installed or used in the open space and have the sun irradiation so that the main girder is unevenly distributed along the cross section temperature.