First, in the steel structure engineering design description, for the material of the welded steel structure, only indicate the steel model, no quality grade requirements, for the quality of the weld, some are not clear quality grade, and some proposed quality grade is inappropriate.

Second, with the gradual deepening of China's reform and opening up, after the "WTO entry", the construction industry has gradually integrated with international practices, some large public construction projects in China are invited to the world tender, some of the construction plans are won by foreign design firms, some of the winning construction plans although there are innovative, but also quite controversial, especially some of the winning scheme structure is not reasonable. It's not even reasonable.

Third, when designing the length of the component, the construction site is not investigated, some components are too long, the transportation conditions can not be solved, some components are too heavy, the site lifting capacity can not meet and so on. ​

Fourth, in the design of friction type high-strength bolt connection, the specification and number of strong bolts of a connection node are calculated by the internal force of the node, but the diameter and number of high-strength bolts selected in some designs do not match the section size of the node plate. Under the action of the design limit load, there will be bolts that have not reached the design strength and the connection plate has been deformed. Loss of carrying capacity.

5. When the anti-lateral force support member is connected to the beam and column, the operation space of the bolt wrench tool is not considered when the node plate is connected by bolts, which brings difficulties to the construction.

Six, the waterproof, heat insulation and anti-corrosion design of steel structure is not enough attention, there is no clear steel rust removal grade and coating and coating thickness in the design document, and there is no corresponding heat insulation protection measures according to the different fire resistance limits of different parts of the components.