（1 北京工业大学工程抗震与结构诊治北京市重点实验室， 北京 100124；2 北京天基新材料股份有限公司， 北京 100161）

［摘要］膨石材料强度较低，普通膨石轻板易发生剪切破坏。为了改善膨石轻板受力性能，设计了配置受压纵筋、加大板厚、钢骨架的8块膨石轻板足尺试件，分析双筋、板厚以及钢骨架对其受力性能的改善效果，研究膨石与钢骨架的协同作用。试验结果表明，双筋与增大板厚对膨石轻板受力性能的改善作用效果远不及钢骨架；钢骨架与膨石的相互约束，显著提高了板的承载力和延性；膨石提高了钢骨架上翼缘的受压局部稳定性，钢骨架使膨石处于三向受压状态，提高了其极限压应变。

［关键词］膨石轻板； 钢骨架； 承载力； 局部失稳； 延性

中图分类号：TU528-2文献标识码：A文章编号：1002-848X(2019)23-0070-06

Experimental study on static behavior of steel-encased modified perlite concrete slab

Li Yongmei1, Feng Yupei1, Peng Lingyun1, Wang Wenming2, Chen Zhiyong2 

(1 Beijing Key Lab of Earthquake Engineering and Structural Retrofit, Beijing University of Technology, Beijing 100124，China; 2 Beijing Tianji New Material Co., Ltd., Beijing 100161, China)

Abstract:Because the strength of modified perlite concrete is low, the shear failure occurs easily for the normal modified perlite concrete slabs. In order to improve the mechanic behavior of modified perlite concrete slab, eight full-scale modified perlite concrete slab specimens were designed with compressive longitudinal steel bars, increased slab thickness and steel encase. It aimed to analyze the improved effect of double steel bars, increased slab thickness and steel encase respectively on mechanic behavior of modified perlite concrete slab. Also cooperative work between modified perlite concrete and steel encase was studied. The experimental results show that the effects of double steel bars and increased slab thickness on improving the mechanical properties of modified perlite concrete slab is far less than that of setting steel encase; the mutual restraint between steel encase and modified perlite concrete significantly improves the bearing capacity and ductility of modified perlite concrete slab; the modified perlite concrete improves the local stability of the upper flange of the steel encase under compression, while the steel encase makes the modified perlite concrete compressed in three directions to improve its ultimate compressive strain.

Keywords:modified perlite concrete slab; steel encase; bearing capacity;  local stability; ductility

*北京市自然科学基金资助项目（8152008）。

作者简介：李永梅，博士，副教授，硕士生导师，Email: liym@bjut.edu.cn。