1、 The steel structure is light in weight. Although the unit weight of steel structure is large, its strength is much higher than that of other building materials. Therefore, when the load and conditions are the same, the steel structure is lighter than other structures, convenient for transportation and installation, and can span a larger span.

二、鋼材的塑性和韌性好。塑性好，使鋼結構一般不會因為偶然超載或局部超載而突然斷裂破壞。韌性好，則使鋼結構對動力荷載的適應性較強。鋼材的這些性能對鋼結構的可靠提供了充分的保證。

2、 Steel has good plasticity and toughness. Good plasticity, so that the steel structure will not break suddenly due to accidental overload or local overload. Good toughness makes the steel structure more adaptable to dynamic load. These properties of steel provide sufficient guarantee for the safety and reliability of steel structure.

三、鋼材更接近于勻質和各向同性體。鋼材的內部組織比較均勻，非常接近勻質和各向同性體，在一定的應力幅度內幾乎是完全彈性的。這些性能和力學計算中的假定比較符合，所以鋼結構的計算結果較符合實際的受力情況。

3、 Steel is closer to homogeneous and isotropic body. The internal structure of steel is relatively uniform, very close to homogeneous and isotropic body, and almost completely elastic within a certain stress amplitude. These properties are consistent with the assumptions in mechanical calculation, so the calculation results of steel structure are more consistent with the actual stress situation.

四、鋼結構制造簡便，易于采用工業化生產，施工安裝周期短。鋼結構由各種型材組成，制作簡便。大量鋼結構都在化的金屬結構制造廠中制造;精確度高。制成的構件運到現場拼裝，采用螺栓連接，且結構輕，故施工方便，施工周期短。此外，已建成的鋼結構也易于拆卸、加固或改造。

4、 The steel structure is easy to manufacture, easy to adopt industrial production and short construction and installation cycle. The steel structure is composed of various profiles, which is easy to manufacture. A large number of steel structures are manufactured in specialized metal structure manufacturing plants; High accuracy. The fabricated components are transported to the site for assembly, connected by bolts, and the structure is light, so the construction is convenient and the construction period is short. In addition, the built steel structure is also easy to disassemble, reinforce or transform.

五、鋼結構的密封性好。鋼結構的氣密性和水密性較好。

5、 The steel structure has good sealing performance. The steel structure has good air tightness and water tightness.

六、鋼結構的耐熱性好，但防火性能差。鋼材耐熱而不耐高溫。隨著溫度的升高，強度就降低。當周圍存在著輻射熱，溫度在150度以上時，就應采取遮擋措施。如果一旦發生火災，結構溫度達到500度以上時，就可能全部瞬時崩潰。為了提高鋼結構的耐火等級，通常都用混凝土或磚把它包裹起來。

6、 Steel structure has good heat resistance, but poor fire resistance. Steel is heat-resistant but not high temperature resistant. As the temperature increases, the strength decreases. When there is radiant heat around and the temperature is above 150 ℃, shielding measures shall be taken. In case of fire, when the structure temperature reaches more than 500 degrees, it may collapse instantaneously. In order to improve the fire resistance rating of steel structure, it is usually wrapped with concrete or brick.

七、鋼材易于銹蝕，應采取防護措施。鋼材在潮濕環境中，特別是處于有腐蝕介質的環境中容易銹蝕，必須刷涂料或鍍鋅，而且在使用期間還應定期維護。

7、 Steel is easy to rust, so protective measures shall be taken. Steel is easy to rust in humid environment, especially in the environment with corrosive medium, so it must be painted or galvanized, and regular maintenance shall be carried out during use.

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