Steel structure company processing: steel structure construction engineering design problem cause analysis

1, Design theory level

The design steps of steel structure buildings in China are usually: to measure the internal work of each prefabricated component of the steel structure according to the elastic method. Because when the steel structure reaches the limit state, it will enter the elastic-plastic deformation link, which will lead to the heavy internal work of the structure. According to the current design scheme, the consistency of the reliability of the bearing capacity of the prefabricated components cannot be guaranteed.

2. Steel structure management system level

Steel structure engineering project is less than 6 layers, can take the structure of a support point or frame system, higher than 6 layers of the structure of a concrete frame column or structure template support system; shear wall has H type steel column, steel pipe concrete column and steel reinforced concrete column. In the construction of steel structures with the following 6 floors, the composite column will save steel than the H-shaped steel column. Bailey frame has higher ductility than frame column. When the earthquake grade is large, the seismic force with strong ductility is small, and the seismic force with poor ductility is large. In terms of anti-high earthquake disaster performance, Bailey frame is better than concrete frame column. The steel frame-concrete shear wall management system belongs to steel concrete structure. Scientific research on durability level is not enough.

3. Design of steel structure floor slab

The floor slab not only bears the vertical load and sends it to the structure, but also transmits the horizontal load to the column, so the compressive strength, bearing capacity and unity of the floor slab are very important. As a steel structure project regulation, floor slab should also pay attention to sound insulation and noise reduction regulations; At this stage, steel structure engineering, pressure plate composite floor, concrete floor and other applications are more; For disaster areas or key steel structures with relatively high earthquake magnitude, in column design, steel groove reinforcement should be set near the column to prevent high mass force from damaging the floor slab.

Steel structure company processing: steel structure structure seismic design level.

1. Response spectrum problem of design scheme

The structure of the earthquake disaster video recorder weakens many earthquakes of more than 3 seconds, so the calculated response spectrum is inconsistent with the facts, and the spectral curve map adjusted by the Ministry of Construction to ensure the safety of steel structure products Structural seismic design, stability needs to be further confirmed.

2, elastic-plastic earthquake disaster reflects the measurement problem.

At this stage, China does not have a high-rise residential steel structure elastic-plastic seismic disaster reflection measurement program process, the lack of indoor space elastic-plastic seismic disaster reflection analysis system.

3. Defects in high-span design of steel-concrete structure

China is a multi-earthquake disaster in China, countries around the world and no research in this area, to address the structural seismic design standards, design indicators and design theory.

Steel structure company processing: steel structure connection points and supporting structure level

1. Node design

The important content in the steel structure design scheme includes the connection node design scheme, which needs to be fully considered and clear about the way of connection point in the structural characteristics. It is important to prevent the nodes of the post-design scheme from being completely consistent with the methods commonly used in structural analysis methods. In addition, the node design must also consider the installation of bolts, field welding and other engineering construction indoor space and component lifting sequence.

2. Electric welding

The size and method of welding should be strictly implemented standards: the selected welding wire should be consistent with the metal material. The welding design scheme of electric welding shall not be arbitrarily increased. The center of gravity of the welded and joined precast members shall be as close as possible.