国产精品美女久久久久av超清_法国空姐电影在线_国产999久久久_女仆男又爽又黄免费女仆视频_www黄色网址_午夜的福利_国产内射爽爽大片_污污视频在线_搞中出视频_麻豆精产国品_一二三精品_手机电影在线观看_日韩一区二区三区视频在线_乱老熟女一区二区三区_亚洲欧美丝袜中文综合

A Brief Analysis of General Knowledge of Steel Structures

Characteristics of Steel Structures

1、 Lightweight and high-strength

Q235 steel density: 7850kg/m ³

Strength: 215N/m ²

C30 concrete density: 2450kg/m ³

Strength: 14.3N/m2

Lightweight - the ratio of mass density to strength of a material ρ/ F small

Q235 steel ρ/ F=1.7-3.7x10-4/m

C30 concrete ρ/ F=17x10-4/m

2、 Good plasticity and durability

Reflection on the Wenchuan earthquake damage: Steel structure buildings have good ductility and strong integrity, excellent seismic performance, and rarely experience overall damage or collapse during earthquakes.

3、 Convenient manufacturing and short construction cycle

Prefabrication of components in the factory, with short construction cycle

4、 Good heat resistance, poor fire resistance

5、 Poor corrosion resistance

6、 Low temperature cold brittleness tendency

Metal curtain wall panel, color steel rock wool sandwich panel, polyurethane color steel plate, polyurethane sandwich panel, polyurethane wall panel, polyurethane roof panel, polyurethane rock wool sandwich panel, polyurethane glass wool panel, polyurethane edge sealing rock wool sandwich panel, polyurethane edge sealing glass wool panel, polyurethane board, polyurethane PU board