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(jié)構(gòu)一般不會(huì)因?yàn)榕既怀d或局部超載而突然斷裂破壞。韌性好，則使鋼結(jié)構(gòu)對(duì)動(dòng)力荷載的適應(yīng)性較強(qiáng)。鋼材的這些性能對(duì)鋼結(jié)構(gòu)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(zhì)和各向同性體。鋼材的內(nèi)部組織比較均勻，非常接近勻質(zhì)和各向同性體，在一定的應(yīng)力幅度內(nèi)幾乎是完全彈性的。這些性能和力學(xué)計(jì)算中的假定比較符合，所以鋼結(jié)構(gòu)的計(jì)算結(jié)果較符合實(shí)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(jié)構(gòu)制造簡(jiǎn)便，易于采用工業(yè)化生產(chǎn)，施工安裝周期短。鋼結(jié)構(gòu)由各種型材組成，制作簡(jiǎn)便。大量鋼結(jié)構(gòu)都在化的金屬結(jié)構(gòu)制造廠中制造;精確度高。制成的構(gòu)件運(yùn)到現(xiàn)場(chǎng)拼裝，采用螺栓連接，且結(jié)構(gòu)輕，故施工方便，施工周期短。此外，已建成的鋼結(jié)構(gòu)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(jié)構(gòu)的密封性好。鋼結(jié)構(gòu)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(jié)構(gòu)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(qiáng)度就降低。當(dāng)周?chē)嬖谥椛錈幔瑴囟仍?50度以上時(shí)，就應(yīng)采取遮擋措施。如果一旦發(fā)生火災(zāi)，結(jié)構(gòu)溫度達(dá)到500度以上時(shí)，就可能全部瞬時(shí)崩潰。為了提高鋼結(jié)構(gòu)的耐火等級(jí)，通常都用混凝土或磚把它包裹起來(lái)。

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(yīng)采取防護(hù)措施。鋼材在潮濕環(huán)境中，特別是處于有腐蝕介質(zhì)的環(huán)境中容易銹蝕，必須刷涂料或鍍鋅，而且在使用期間還應(yīng)定期維護(hù)。

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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