Steel structure engineering in the United States is generally divided into two types, one is heavy-duty steel structure, and the other is lightweight steel structure. What are the quality problems that often occur in formed steel structure engineering?
Common quality accidents in steel structure engineering that may occur during demon elimination:
① The rod is twisted, deformed or partially cracked;
② Damaged connection of rod sealing plate or cone head weld seam;
③ Node deformation or cracking;
④ The weld seam is not full or has bubbles, slag inclusions, and micro cracks that exceed the rules and specifications;
⑤ High strength bolts crack or are pulled out of the ball joint;
⑥ Members collide at nodes, and when the upper chord is supported, the support web member collides with the support layout;
⑦ Support node displacement;
⑧ The deflection of the grid structure is too large, exceeding 1.15 times the corresponding value of the description rule.
The main reason for this phenomenon is:
1. The selection of steel structures is unreasonable, the matching of member sections is unreasonable, and the influence of initial bending, initial eccentricity, and secondary strain of components is ignored. The load is underestimated or omitted in the description, or the load combination is inappropriate;
2. Unreasonable selection of materials;
3. Errors in the selection of accounting methods, assumptions, and computer programs were not discovered;
4. After the layout description calculation, data substitution was carried out without review, resulting in the presentation of strength components beyond the description value;
5. Drawings are incorrect or incomplete. Such as disorderly scale labeling, unclear design, omissions in required materials, technical requirements, construction procedures, and special requirements;
6. The structure of the node is incorrect, and the detailed considerations are not comprehensive enough.
