Why is the seismic resistance of steel structures？
First, the steel structure is light in weight
Although the bulk density of the steel structure is larger, compared with other building materials, its strength is much higher, so when the load and conditions are the same, the steel structure is lighter than other structures, easy to transport and install, and can span a larger span.
Second, the plasticity and toughness of the steel are good, so that the steel structure will not be suddenly broken and damaged due to accidental overload or local overload. If the toughness is good, the adaptability of the steel structure to the dynamic load is stronger. These properties of steel provide a full guarantee for the safety and reliability of the steel structure.
3. Steel is closer to homogeneity and isotropy The internal structure of steel is relatively uniform, very close to homogeneity and isotropy, and is almost completely elastic within a certain stress amplitude. These properties are in line with the assumptions in the mechanical calculation, so the calculation results of the steel structure are more in line with the actual force.
Fourth, the steel structure is simple to manufacture, easy to adopt industrial production, and the construction and installation period is short The steel structure is composed of various profiles and is easy to make. A large number of steel structures are manufactured in specialized metal structure manufacturing plants; High accuracy. The components made are transported to the site for assembly, bolted connection, and the structure is light, so the construction is convenient and the construction period is short. In addition, the completed steel structure is also easy to dismantle, reinforce, or remodel.
Fifth, the sealing of the steel structure is good The air tightness and water tightness of the steel structure are good.
Sixth, the steel structure has good heat resistance, but poor fire performance Steel is heat resistant but not high temperature resistant. As the temperature increases, the strength decreases. When there is radiant heat in the surrounding area and the temperature is above 150 degrees, sheltering measures should be taken. In the event of a fire, if the temperature of the structure reaches 500 degrees Celsius or more, all of them may collapse instantaneously. In order to improve the fire resistance grade of the steel structure, it is usually wrapped with concrete or bricks.
7. Steel is easy to corrode, and protective measures should be taken Steel is easy to rust in a humid environment, especially in an environment with corrosive media, so it must be brushed with paint or galvanized, and it should be maintained regularly during use.
