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（1 北京工業(yè)大學(xué)工程抗震與結(jié)構(gòu)診治北京市重點(diǎn)實(shí)驗(yàn)室， 北京 100124；2 北京天基新材料股份有限公司， 北京 100161）

［摘要］膨石材料強(qiáng)度較低，普通膨石輕板易發(fā)生剪切破壞。為了改善膨石輕板受力性能，設(shè)計(jì)了配置受壓縱筋、加大板厚、鋼骨架的8塊膨石輕板足尺試件，分析雙筋、板厚以及鋼骨架對(duì)其受力性能的改善效果，研究膨石與鋼骨架的協(xié)同作用。試驗(yàn)結(jié)果表明，雙筋與增大板厚對(duì)膨石輕板受力性能的改善作用效果遠(yuǎn)不及鋼骨架；鋼骨架與膨石的相互約束，顯著提高了板的承載力和延性；膨石提高了鋼骨架上翼緣的受壓局部穩(wěn)定性，鋼骨架使膨石處于三向受壓狀態(tài)，提高了其極限壓應(yīng)變。

［關(guān)鍵詞］膨石輕板； 鋼骨架； 承載力； 局部失穩(wěn)； 延性

中圖分類號(hào)：TU528-2文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：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

*北京市自然科學(xué)基金資助項(xiàng)目（8152008）。

作者簡(jiǎn)介：李永梅，博士，副教授，碩士生導(dǎo)師，Email: liym@bjut.edu.cn。