一、前言 偏轨箱形梁的小车轨道安置在主腹板顶部,轮压通过主腹板传递给整个箱形梁,因此它受有偏心载荷引起的扭矩。由于偏轨箱形梁具有抗弯抗扭性能好,重量轻(可以省去走台),制造方便等优点,它被广泛应用于桥式起重机和龙门起重机中,尤其在大吨位的起重 I. INTRODUCTION The trolley track of the derailment box girder is placed on the top of the main web and the wheel pressure is transmitted to the whole box girder through the main web so that it is subject to the torque caused by the eccentric load. Due to the advantages of good bending and torsion resistance, light weight (eliminating the need to go to the platform) and manufacturing convenience, the side-rail box beam is widely used in overhead traveling cranes and gantry cranes, especially in large tonnage lifting