亚洲精品在线观看少妇,国产激情亚洲一区,国产人碰人摸人爱免费视频,久久国产精品一区二区,久久国产精品免费看,日韩欧美视频熟女,婷婷午夜电影在线观看,色婷婷国产麻豆精品,八年沉淀只做精品,国产在线视频专区,日韩欧美纯爱电视剧电影免费观看,亚洲国产日本免费观看,天堂亚洲欧美日韩一区二区,中文字幕有码系列在线观看,久久日韩精品一区,小明欧美精品视频在线观看,91av成人一区二区三区,欧美日韩亚洲综合在线一区二区,亚洲一区二区二三区日日骚,在线观看欧美一区二区三区精品,日本欧美黄色一级片,欧美av一区二区三区在线观看,91成人国产麻豆一区二区

How to distinguish between multi-layer steel structure and single-layer steel structure

When the temperature of the steel structure changes from zero to 150 ℃, the fire resistance of the steel structure decreases greatly, but the test shows that the fire resistance grade of the steel structure decreases from zero to 600 ℃. When the steel structure is wrapped or covered with bricks, when the thickness of the fireproof coating of the fireproof coating is 15mm, the fire resistance limit of the steel member can reach 1.5h.

1. Single storey: buildings with only one floor on the ground are single storey buildings, including industrial plants (with a single storey height of more than 6-8m), civil buildings (2.2-3m), agricultural plant greenhouses (more than 2.2m), etc.

2. Multi storey: refers to a 4-6 storey building.

3. High rise: refers to buildings with more than 10 floors and a total height of less than 100m.

4. Super high rise: refers to buildings with more than 40 floors and more than 100 meters.

5. High rise and super high rise mainly adopt steel-concrete structure, such as cross column, box column and other structural forms.