1，刚架与墙面之间的连接无法实现良好的抗风雨性能，墙面的整体性仅仅依赖于密封胶。出于制造及安装中的误差，钢结构与面板之间的缝隙在宽度上一般是不均匀的，也许会需要大量的密封胶，这样通常会导致外表不美观。近期就有一个钢结构外露的项目，只有提供密封胶条的销售人员才对该项目的外表感到完全满意。

2，当梁柱上采用隅撑时，主刚架的材料利用率会很高。但当这些隅撑以及螺栓连接的端板暴露于室外时，也许看上去不会十分美观。

3，获得在主结构上高质量的工厂喷涂面漆或彩色镀锌面漆很难。而在腐蚀气候条件下，刷有中等质量面漆的主结构也许不会有很长的寿命。

4，一些建筑师忘记了预制金属建筑主刚架是由相对较薄的板件组成的，腹板与翼缘板之间的焊接通常只在腹板一边。除了在结构工程师心中引起对方案的关心外，这种单面焊缝无法与热轧型钢的光滑转角相媲美，同时也无法提供良好的抗大气性能。

1, the connection between the frame and metope can't realize the good weather resistance, the integrity of metope depends only on the sealant. For manufacture and installation of the error, the gaps between the steel structure and the panel is not uniform in width, may need a lot of sealant, so usually cause not beautiful appearance. Recently there is a steel structure exposed project, only provide sealing strip sales staff was completely satisfied with the appearance of this project.

2, when used on knee brace beam, the main frame of high material utilization. But when the knee brace and bolted end plate when exposed to outdoor, maybe looks not very beautiful.

3, in the main structure of high quality color spray paint or galvanized surface paint factory very hard. In corrosion conditions, there was a moderate quality paint brush main structure may not have a long life.

4, some architects forget prefabricated metal building main frame is composed of a relatively thin plates, between web and flange plate welding are usually only in the web side. In addition to the structural engineer heart caused concern for solution, the one-side weld with smooth corner was comparable to that of hot rolled steel at the same time also can't provide good resistance to atmospheric properties.

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