In recent years the development of China's construction steel structure rapidly built or are building a large number of long-span and high-rise steel structure, such as the bird's nest, the water cube and the National Theatre, CCTV, Shanghai global center, Guangzhou TV Tower, the construction of these projects have greatly improved the design level of steel structure in china. Some are designed by our project to reach a new level, such as the inclined arch saddle shell - Nanjing Olympic sports center span of 361 meters, 122 meters of cable supported lattice shells - Ji'nan Olympic Sports Center project is the construction scheme of the novel, reasonable bearing structure, steel saving, in line with China's national conditions of good works. But it should also be noted that some of the major projects are basically designed by foreign countries, many of which are not reasonable structure of the project, the amount of steel is too large, the cost is staggering, not in line with China's national conditions. In the face of a large number of projects launched, our design system, design concept, design level, design quality, design quality is far from being able to adapt, there are many problems to be solved.

Design depth is not enough, the design institute will be transferred to their own design tasks to the processing enterprises, resulting in quality degradation

Many of the design units, the design level of steel structure is relatively low, undertake the project designers for just graduated from the doctor, the lack of practical experience, the lack of design knowledge of steel structure, blindly copying the norms, procedures for key technology research, the design results didn't end in mind, only give 'component layout of "even if the completion of the task, and some layout is just a simple single line diagram, the key node design" regardless of the specific circumstances should be adopted for welded joints "or" full "map" of a cast steel node, the node is safe, structure is reasonable, whether can do heart have no bottom, should be the design of "joint construction" and "supporting details" and "construction" to the processing enterprises, design institute only "design" or preliminary The design depth, will be given to the construction processing plants, processing plants and lack of software, construction task is subcontracted out, due to the lack of professional knowledge supporting subcontractors, to the overall design requirements are not clear, often make drawings do not meet the requirements of the original design, there are serious quality problems. Some processing plants in order to save steel, reduce cost, blind steel optimization, resulting in project quality accident, such as * project, after optimization caused by bar is too small, resulting in the construction process of hundreds of bar instability. Major losses to the state's key projects. "Construction design" by the Design Institute, which is the Ministry of construction has been prescribed, but also the design institute's bounden responsibility, construction design must meet the design requirements of the depth, "construction design" and "design" is unclear, buck passing situation should be immediately corrected.

Two, the foreign design can not copy, not to dare to challenge the reasonable plan

Many of the current major steel structure engineering construction scheme are used abroad, but its structure is not reasonable and the scheme is too big, the amount of steel cost amazing! Due to the special situation of China's foreign engineer structure earthquake and wind load understanding is not deep enough, so the design scheme in the seismic design aspect is not reasonable. "The bird's nest", the steel roof and concrete stands completely torn off, huge steel truss seismic loads generated by tens of thousands of tons of steel column to column bottom, and thousands of tons of great horizontal force at the bottom of the column and by the foundation of mega steel column stands off the pass, resulting in steel consumption reached fifty thousand tons. A similar stadium with four times the amount of steel, which is resistant to seismic design unreasonable scheme, such as the earthquake force will produce tens of thousands of tons of steel structure to concrete stands, can reduce the amount of steel, while maintaining the original Architectural style remains unchanged, the steel structure of large heavy steel consumption reduction of more than 20 thousand tons. Such as "Shenzhen Universiade Stadium", using a single folded plate latticed shell is a shell, and stand from solution, due to the large span reticulated shell structure stiffness system is too soft, too bad, under the wind load is far beyond the standard requirements. Through the effective challenge of our designers, we have added the "shoulder Valley ring" to the external shell, so that the horizontal displacement of the structure is nearly doubled. "New CCTV" by the form of two-way tilt, cantilever docking, serious irregularities, serious overrun, large volume, large weight cantilever structure which is not conducive to withstand seismic, earthquake resistant design is very unreasonable, in order to meet the requirements of seismic design, steel consumption reached more than 120 thousand tons, created in China the single building of the engineering steel. Also created the world's steel construction project miracle!

Three, the design project design quality decline caused by subcontracting

The design of project subcontracting is mainly manifested in the design tasks of the major design institutes of technology contract is quite heavy, and comprehensive professional design of higher fees, and the steel structure part is hard, labor-intensive low fees, not willing to undertake the task of steel structure design, or lack of experience in the design of steel structure, so often the steel structure subcontractor to another unit. As a gymnasium in Shandong, formerly Beijing a large Design Institute, after the steel structure part subcontracted to a Xiamen Design Institute, the Institute will not suffer from the design of steel structure part of the package to the * * university. After expert review found that the design, calculation model, the concept of a large number of seismic problems. Another performance for subcontracting use "qualification" or "buy icon", some of the non qualified units, get the project, make design to buy icon, make the design quality there are significant risks. The current design of the market confusion, the lack of legal management of the quality of design, the lack of strict inspection and supervision, the emergence of a number of collapse accidents are related to the design qualification. If you do not regulate the market, strict quality management, will cause serious consequences.