咨询电话:0554-4991161
新闻中心
联系我们

电话:0554-4991161
手机:18175036696 
         13588259339
传真:0554-4991161
地址:寿县炎刘镇二环
路与新桥大道路口向东100米

当前的位置:网站首页 >> 新闻中心 >> 新闻中心 新闻中心

合兴安徽钢结构浅谈结构用钢高温力学性能分析

发布时间:2015-12-14 9:51:21 浏览次数:702

以在实际工程中最常用的钢材Q235钢为例,其屈服强度和弹性模量与常温下对应值之比随火灾温度变化的曲线。

        在火灾条件下,Q235钢的力学性能与常温下相比,有明显不同。

        (1)屈服强度随火灾温度的升高而降低。在200’C时,屈服强度为常温下的82.3%;在400。C时,屈服强度为常温下的49.8%;在600℃时,屈服强度只有常温下的20.4%。

        (2)弹性模量随火灾温度的升高而降低。在200。c时,弹性模量为常温下的95.9%;在400℃时,弹性模量为常温下的83.1%;在600。C时,弹性模量只有常温下的17.1%。

        由此可见,钢材虽为非燃烧材料,但不耐火。在火灾高温条件下,结构钢的强度和刚度都将迅速下降。因此,当建筑采用无防火保护措施的钢结构时,一旦发生火灾,结构很容易发生破坏。例如,2004年10月,河南省某市一家电量贩发生火灾,钢结构屋顶被烧整体倒塌,造成2人被埋压致死。把安全工程师站点加入收藏夹

 

In the actual engineering of the most commonly used steel Q235 steel for example, the yield strength and modulus of elasticity and elastic modulus of the corresponding value with the temperature change curve.
Under fire conditions, the mechanical properties of Q235 steel are obviously different from that of normal temperature.
(1) the yield strength decreases with the increase of fire temperature. At 200 'C, the yield strength is 82.3% at room temperature, at 400. In C, the yield strength was 49.8% at 600, and the yield strength was only 20.4% at the normal temperature.
(2) the elastic modulus decreases with the increase of fire temperature. In 200. C, the modulus of elasticity is 95.9% at room temperature, and the elastic modulus is 83.1% at room temperature at 400 and 600. At C, the elastic modulus is only 17.1% at room temperature.
Thus, although the steel is non combustible material, but not refractory. The strength and rigidity of the structural steel will be decreased rapidly in the high temperature condition. Therefore, when the building uses no fire protection measures of steel structure, once the fire, the structure is very easy to destroy. For example, in October 2004, in the Henan Province, a home appliances discount fire, burned the whole steel structure roof collapsed, killing 2 people buried pressure of death. The site safety engineers to join favorites

 

 

 

寿县合兴钢结构有限公司是专业从事安徽钢结构,合肥彩钢瓦,寿县钢结构,合肥钢结构公司

官方网站:http://www.sxhxgjg.com


 

 


最新内容:

版权所有:寿县合兴钢结构有限公司 合肥网络布线
电话:0554-4991161    手机:18175036696  13588259339

传真:0564-4991161  地址:寿县炎刘镇二环路与新桥大道路口向东100米 网站地图