ability in fire resistanceРHigh price of steelsР1.1.2 Disadvantages? 钢结构的缺点Р在火灾中,未加防护的钢结构一般只能维持20分钟左右!Р火灾中倒塌的钢桁架Р火灾中软化的钢梁Р钢结构的防火保护措施Р工人包覆防火板Р工人喷涂防火涂料Р水泥沙浆包覆Р包覆防火板Р喷涂防火涂料Р1.2 Developments and Applications of Steel StructuresР钢结构的发展和应用РAt the beginning of the 19th century:?Iron structures were used in buildings and bridges in EuropeР1.2.1 Development history in foreign countriesРIn 1856 steel was first manufactured?The age of steel beganР1856年:英国人贝斯麦首次用转炉炼钢成功,钢材开始用于建筑结构,?进一步出现了轧制型钢和铆钉连接方法,钢结构得到了广泛应用РHome pany Building?家庭保险公司大楼РLocation: Chicago, Illinois, pletion Date: 1885 (demolished in 1931)?Height: 55m (138 feet)?Stories: 10?Materials: Steel?Facing Materials: Brick?Engineer(s): William LeBaron JenneyРIn 1885 the first high-rise steel-framed building pleted:?Home pany building in Chicago
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