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Reliability Of Steel Structures

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What are the advantages of steel structure?

First, the steel structure is light weight: the bulk density of steel structure is large, compared with other building materials, its strength is much higher, so when the load and the same conditions, the steel structure than other structures, easy to transport And install, and can span a larger span.

Second, the plasticity and toughness of steel Good plasticity, so that the steel structure is generally not because of accidental overload or partial overload and sudden fracture damage. Toughness is good, so that the steel structure of the dynamic load adaptability. These properties of steel provide a guarantee for the safety and reliability of steel structures.

Third, the steel is closer to the homogeneous and isotropic body of the internal structure of steel is relatively uniform, very close to the homogeneous and isotropic body, Steel Structure in a certain range of stress is almost completely elastic. These properties are more consistent with the assumptions in the mechanical calculation, so the results of the steel structure are more realistic than the actual force.

Fourth, the steel structure is simple, easy to use industrial production, construction and installation cycle of short steel structure by a variety of profiles, production is simple. A large number of steel structures are manufactured in specialized metal structures; high precision. Made of components shipped to the scene assembled, the use of bolts, and the structure of light, so the construction is convenient, Steel Structure short construction period. In addition, the built steel structure is also easy to disassemble, reinforcement or transformation.

Fifth, the steel structure of the good sealing of the steel structure of the air tightness and watertight better.

Six, the heat resistance of steel structure is good, but the fire performance of poor heat resistance and heat-resistant high temperature. As the temperature increases, Steel Structure the strength decreases. When there is radiation around the heat, the temperature above 150 degrees, it should take measures to block. If in the event of a fire, the structural temperature of more than 500 degrees, it may all instantaneous collapse. In order to improve the fire resistance of the steel structure, usually with concrete or brick to wrap it up.

7, steel is easy to rust, should take protective measures Steel in humid environment, especially in corrosive media environment is easy to rust, must paint or galvanized, Steel Structure but also during the use of regular maintenance.

Function requirements of steel structure

The functions of the steel structure within the specified design life period are:

(1) in the normal construction and normal use, Steel Structure can withstand the various roles that may arise;

(2) in normal use with good work performance;

(3) has sufficient durability under normal maintenance;

(4) to maintain the necessary overall stability at the time of occurrence of contingencies (such as earthquakes, fires, explosions, impacts, etc.) that occur.

The above-mentioned "various effects" refer to various causes of internal forces or deformation of the steel structure, such as the concentrated load or distributed load applied to the steel structure, and the causes of deformation or restraint of the steel structure, such as earthquakes, Settlement, temperature changes and so on.

Reliability of steel structures

The capacity of a steel structure to perform a predetermined function within a specified period of time, under specified conditions, is referred to as the reliability of the steel structure. The reliability of the steel structure is a quantitative description of the reliability of the steel structure, that is, the probability that the steel structure completes the intended function under the specified conditions for a specified period of time. The requirements for the reliability of steel structures are related to the length of the design basis of the steel structure. The design basis is long and the reliability requirements are high and vice versa. Steel Structure The design basis for a typical building is 50 years.

Limit state of steel structure

The entire steel structure or part of the steel structure beyond a certain state can not meet the design requirements of a functional requirements, said the specific state of the functional limit state. The limit state is essentially a reliable and unreliable boundary of the steel structure, so it can also be called a "boundary state". For the various limits of the steel structure, a clear mark or limit shall be specified.

China's "steel structure design specifications" (hereinafter referred to as GB50017 specification or specification) provides that the bearing steel structure should be the following two types of limit state design:

(1) Carrying capacity limit state includes: structural and connection strength damage, fatigue damage and due to excessive deformation and is not suitable for continued carrying, Steel Structure steel structure and components loss of stability, steel structure into the motor system and steel structure overturned.

(2) Normal use of extreme conditions include: local damage (including concrete cracks in composite steel structures) that affect the normal use or durability of steel structures, components and non-steel structures.

The probability of carrying capacity limit is compared with the normal use limit state, the former may lead to personal injury and a lot of property damage, so the probability of occurrence should be very low, while the latter harm to life is small, so the probability of allowing the emergence of higher, but Should still be given enough attention.


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