Why do steel structure collapse accidents always happen? How can they be prevented?

Common causes of steel structure collapse        

1. Steel structure corrosion damage      

     Rusting of steel structure will reduce its bearing capacity, seriously affect its durability, destroy its solidity and cause accidents.

 

2.Deformation of steel structure      

     Deformation of steel structure will affect the assembly and connection, reduce the stability and overall stiffness of the structure, and lower the bearing capacity of the members, thus inducing the deformation accident of steel structure. Common deformation mainly includes: steel cold processing deformation, initial steel deformation, deformation caused by high temperature or collision, production and installation deformation and welding deformation.  

 

3.Steel Structure Material Defects      

     Due to defects in the production process of steel structure materials, the toughness and plasticity of steel are reduced, and accidents are caused by the reduced performance of steel.      

 

4.Poor fire resistance of steel structure      

     The outstanding disadvantage of steel structure is poor fire resistance, in the fire, the steel structure by heat triggered by the mechanical properties of the decline in its bearing capacity is gradually reduced, thus causing the collapse of the steel structure.      

 

5.Instability of steel structure      

     Accidents are easily induced due to the loss of local stability or overall stability of steel structures or components. If in the process of construction and installation, do not take appropriate temporary support system to maintain the stability of the steel structure, it is easy to cause the steel structure instability and then collapse or even toppling.    

 

6.Fatigue damage of steel structure      

     Fatigue damage refers to the repeated alternating loads, the stress level is far below the yield point of steel or the ultimate tensile strength of the steel components and structural damage occurs. For example: repeated use of steel makes the cross-section prone to sudden changes and welds are too concentrated.      

 

How to prevent steel structure collapse                  

1.Legal procedures      

     The construction organization design must be prepared for the characteristics of the project, and the quality and safety technical measures should be prepared and implemented after the approval of A and B parties and supervisory units.      

 

2.Licensed to work      

     The construction enterprise that carries out the operation must have the professional contracting qualification, and the personnel who carries out the work at height and welding operation must hold the special operation license within the validity period before they can go on duty.         

 

3.Preparation of monitoring program      

     Special construction monitoring program shall be prepared to monitor the deformation of steel structure during the construction and installation of steel structure building.      

 

4.Technical handover      

     Safety technical briefing and training should be carried out on site for operating personnel, and safety supervision should be in place.      

 

5.Prevention of corrosion      

     Steel materials that are more prone to corrosion, especially in the environment of humid and corrosive medium, should pay attention to corrosion and humidity prevention, and the steel materials should be processed.      

 

6.Qualified materials      

     Before construction, steel materials should be tested to see if they are qualified, welding materials to see if they are qualified and bolts and other parts connection materials to see if they are qualified.    

 

7.Attention to fire resistance      

     Steel structure building should pay attention to fire resistance, usually fireproof board, fireproof coating, perlite board, gypsum board, concrete or vermiculite board and other materials can be used to wrap up the steel components by hollow method, solid method or tightly affixed method, and these fireproofing measures are taken to ensure that the steel structure meets the limit requirements of standard fire resistance.    

 

8.Load control      

     Strictly control the construction load, especially the concentrated load on the floor slab shall not exceed the design requirements.  

 

9.Safety supervision in place      

     The operation site needs to be equipped with safety management personnel, who can stop the operation personnel in case of illegal operation.