轻钢承重墙用硅酸钙板热工参数模型及墙体耐火极限变参数模拟研究

Study on thermodynamic parameter curve of calcium silicate board and heat transfer simulation of steel wall

根据冷成型钢承重组合墙墙体足尺耐火试验及墙用硅酸钙板内部粉末热工参数测试结果,利用ANSYS软件,对立柱控制截面建立传热模型。通过对比耐火试验结果,给出了硅酸钙板的热工参数模型。通过参数分析发现,改变C型龙骨规格、拼接方式对耐火极限没有显著影响;改变墙板厚度及火源模型则有显著影响。提出了单侧受火双拼C型龙骨墙体内龙骨截面温度分布模型,分析了火源模型降温段引起的墙体截面不同位置降温滞后现象。

Based on the full-scale test of cold-formed steel （CFS） load-bearing wall and the test results of the rmodynamic parameters of calcium silicate board powder, a finite element model （FEM） of crucial cross section was developed using AN- SYS. After comparing the test results, a thermodynamic pa- rameter curve of calcium silicate board was developed. Parame- ter analysis indicated that, depth of web and the joint ways of studs did not affect the fire resistance rating significantly ; the effect of plasterboard thickness and the design fire scenario was significant. A model of the temperature profile across the doub- le C-shaped studs sections of the wall exposed to fire was devel- oped and the process of temperature descending across different parts of the wall section after the fire decayed was analyzed.