一、问题的发生很久以来,常常发现钢梁伸臂安装到最后一两个节间时,梁体只要受到起吊或对眼造成的小量冲击,就会有较大的晃动,引起桥上工作人员的不安。一般的解释,笼统地认为是在伸臂安装情况下,桥梁刚度较差的缘故。采取的措施只是限制长伸臂的安装应力在较低的数值,而没有引起更多的重视。 First, the problem occurred For a long time, it is often found that the beam extension arm installed to the last one or two internals, as long as the beam body by lifting or a small impact on the eye, there will be greater shaking, causing work on the bridge Staff anxiety. The general explanation, generally considered to be in the case of boom installation, the bridge stiffness is poor reason. The measure to be taken is to limit the installation stress of the long boom to a lower value without paying more attention.