The upper flange of the crane beam is relatively narrow, which meets the track installation requirements, but this design can lead to turbulence issues during operation. This problem is quite common in many structures and should be carefully addressed during the design phase. When the crane weight exceeds 10 tons, the lateral compression flange of the beam is often not reinforced, and no horizontal truss is added. As a result, the crane may experience instability or misalignment during movement, which could compromise safety and performance. In projects with a roof slope greater than 40 degrees, the standard body shape coefficient from the load code may not be sufficient to prevent collapse under high wind conditions. It’s important to re-evaluate the aerodynamic effects and ensure proper structural resistance against wind forces. For multi-span unequal-height portal frames or factories with skylights, the wind load distribution becomes complex, leading to unpredictable pressure patterns. This requires more detailed analysis and careful consideration of wind load factors in the design process. Some factory buildings use a mast structure with H-shaped steel roof beams, where the column top is hinged. Although this is not a true portal frame system, it is often designed as such, which may lead to inconsistencies in structural behavior and stability. Many calculations—whether computerized or manual—are incomplete, especially for components like purlins, wall beams, and column supports. Node connections are often simplified or overlooked, which can lead to unsafe assumptions in the final design. When purlins are used as vertical supports in a lateral truss, their capacity and slenderness ratio as struts must be checked. Failing to do so can result in buckling or failure under load, which poses serious risks to the structure. In some cases, there are no tie bars between columns, which can significantly reduce the overall structural integrity. This omission may lead to unexpected deformations or even collapse under certain loading conditions. In some projects, cross bracing is only placed near the side columns, without forming a complete horizontal truss system. This lack of continuity can weaken the building's resistance to lateral forces and reduce its overall stability. Grade A steel cannot be used indiscriminately; its application must follow specific guidelines based on the project's requirements and environmental conditions. Most designs fail to check the horizontal reaction at the column base plate, which is crucial for ensuring that the foundation can safely support the structure under all loading scenarios. In some temperature sections of the plant, independent thermal expansion systems are not properly established, leading to potential issues with structural rigidity and deformation due to temperature changes. Project drawings sometimes omit details about weld types and quality levels, making it difficult to ensure the required strength and durability of the welded joints. Proper documentation is essential for quality control. The lateral and vertical supports for the roof are not always aligned within the same column spacing, preventing the formation of a rigid spatial block. This can result in reduced stiffness and increased vulnerability to dynamic loads. In some cases, the turning points of the rigid frames are not adequately reinforced, and only ordinary rafters are used at the eaves. This can compromise the longitudinal stiffness of the entire building, especially under wind or seismic loads. Some second-floor factories do not perform a comprehensive structural analysis, leaving potential safety hazards unaddressed. This oversight can lead to long-term structural failures or costly repairs. End plates in some structures are less than 16mm thick, which may not provide sufficient strength or rigidity, particularly in areas subjected to high stress or dynamic loads. When cranes are installed, center columns are sometimes designed as swing columns. While this can offer flexibility, it also introduces complexity in the load path and must be carefully analyzed to avoid instability. In some cases, critical support elements are missing entirely, which can severely impact the building's ability to resist lateral forces and maintain its shape over time. Wind-resistant columns are often improperly positioned, not aligning with the nodes of the horizontal support system. This misalignment can reduce the effectiveness of the wind-resisting system and increase the risk of structural damage. The uplift force on anchor bolts in areas with inter-column supports is frequently ignored in the design. Proper calculation of these forces is essential to prevent bolt failure and ensure secure anchorage. There is often no detailed calculation book for the connections between roof supports and column supports, which makes it difficult to verify the adequacy of these critical joints. ColorMeter APP Skin Color，ColorMeter APP detects color difference，ColorMeter APP Color Bias CHNSpec Technology (Zhejiang)Co.,Ltd , https://www.chnspec360.com