What does "deformed L/200" mean in the carrying capacity of channel steel?
This refers to deflection. That is to say, the lowest point after the force is divided by the size of the origin by the ratio of the length L. For example, the length is 3M, the maximum deformation can not exceed 3000/200=15mm, but there is a premise that the force can be deformed, but after the removal of force, it must rebound to the original standard is effective, otherwise it is invalid.
Most of the traditional bridge deflection measurement using a dial gauge or displacement gauge measurement, the current safety assessment in the old bridge or bridge acceptance is still widely used in China, the maintenance of the bridge. The advantage of this method is that the equipment is simple and can be used for multi-point detection. The deflection values of each measuring point are obtained directly, and the measurement results are stable and reliable. But the direct measurement method has many deficiencies, the method requires measuring point pull wire or erection shelf at all, to be measured directly with water under the bridge so; to overpass, affected by railway or highway traffic bound, the method can also be used; across the canyon and other Takahashi also cannot use the direct method of measurement in addition to using direct method; deflection measurement, regardless of layout or revoke the instrument, are relatively complicated time-consuming.
This refers to deflection, deflection is the force or non-uniform temperature changes, the axis of the rod in the direction perpendicular to the axis of the line displacement, or plate surface in the vertical direction of the middle direction of the line displacement. L/200 is the maximum amount of deformation produced per 200mm length. That is to say, the lowest point after the force is divided by the size of the origin by the ratio of the length L. For example, the length is 3M, the maximum deformation can not exceed 3000/200=15mm, but there is a premise that the force can be deformed, but after the removal of force, it must rebound to the original standard is effective, otherwise it is invalid.
