1. Common shelf pass on the market at present: there are generally diamond holes, some with round holes, some without. Circular holes are designed to increase the convenience of connection. For high shelf or especially large shelf, the lack of circular holes can slightly improve the bearing capacity of the column. The initial design of this type of pass is from abroad. It has been used maturely for more than 20 years, and there have never been any reports of bearing problems. Some are butterfly holes, some are tongue holes, some are inverted splay holes, and some are rivet structures.
2. Bearing capacity of various passes: if other structures are the same, the bearing capacity difference is so small that it can be almost ignored. But different pass designs do differ in terms of cost, ease of installation, and stability. For example: diamond hole with reinforced column card, after the shelf load, the column card and column will be pressed, can effectively prevent the shelf from shaking. But for installation, it may add a little more to the cost of installation.
3. The size of the column clip has a considerable relationship with the actual carrying capacity. Theoretically, with the large size of the column clip, the connection mode between the beam and the column will be different.
