Performance of unprotected and protected cellular beams in fire conditions
Performance of unprotected and protected cellular beams in fire conditions
复制标题
无保护和受保护蜂窝梁在火灾条件下的性能
DOI：
10.1016/j.conbuildmat.2015.12.150
复制
发表时间：
2016
影响因子：
7.4
通讯作者：
Nadjai A
中科院分区：
文献类型：
--
作者：
Nadjai A
本文介绍了在高温下对足尺组合楼盖无保护和有不同尺寸和开孔形状的膨胀型涂层保护的蜂窝钢梁的性能的试验研究。所有梁均设计为钢梁和混凝土翼缘之间的全剪切连接，使用带头剪力钉，以便通过腹板后屈曲失效。在火灾中，由于腹板和底部翼缘的横截面较薄，且暴露的周长大于顶部翼缘，因此复合材料构件上的温度分布是不均匀的。因此，腹板材料性能的劣化将在火灾情况下对构件的整体性能产生重要影响。蜂窝梁的耐火性和防火性一直存在很大争议，涉及其在高温下的行为、防火材料和所需厚度。在火灾试验中观察到的两个破坏温度表明，蜂窝梁失败的腹板后屈曲和空腹弯曲与腹板柱的钢截面的屈曲。有限元建模软件TNO-Diana被用来完成数值研究。将实验结果与有限元结果进行了比较，两者吻合良好。然而，通过使用正确的膨胀型涂层材料规格，可以改进欧洲规范方法。
This paper describes an experimental study at elevated temperatures on the behaviour of full-scale composite floor unprotected and protected cellular steel beams with intumescent coating having different size and openings shape. All beams were designed for a full shear connections between the steel beam and the concrete flange using headed shear studs in order to fail in by web-post buckling. In fire, the temperature distribution across a composite member is non-uniform, since the web and bottom flange have thin cross-sections and a greater exposed perimeter than the top flange. The deterioration of the material properties of the web will therefore become an important effect on the overall performance of the member in the event of fire. Fire resistance and protection of cellular beams has been very controversial concerning their behaviour in elevated temperatures, the fire protection material and the required thickness. Two failure temperatures were observed in the fire tests indicated that cellular beams failed by web post buckling and Vierendeel bending associated with the buckling of the web posts of the steel section. The finite element modelling software TNO-Diana was used to complete the numerical investigation. Comparison of the experimental and FEM results is presented and both are in good agreement. However the Euro code approach can be improved by using the correct material specification of the intumescent coating used.
登录
查看更多内容
影响因子：
3.1
作者：
A. Nadjai;O. Vassart;F. Ali;D. Talamona;A. Allam;M. Hawes
通讯作者：
M. Hawes
高温下具有圆形和细长腹板开口的蜂窝梁的实验和数值模拟
影响因子：
1
作者：
El;A. Nadjai;Sang;F. Ali;Sengkwan Choi
通讯作者：
Sengkwan Choi
影响因子：
1
作者：
A. Nadjai;N. Goodfellow;K. Tee;F. Ali;Sengkwan Choi
通讯作者：
Sengkwan Choi
预测部分膨胀涂层防火钢接头温度的简单方法
影响因子：
3.4
作者：
X. Dai;Yong C. Wang;C. Bailey
通讯作者：
C. Bailey