钢-超轻质高韧性橡胶集料混凝土双层夹芯组合板抗多次冲击性能  

Impact performance of steel-RULHDCC double-layer sandwich panels subjected to repeated impact loads

作　　者：黄振宇[1,2] 张维[1,2] 李任 HUANG Zhenyu;ZHANG Wei;LI Ren(College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China;Guangdong Provincial Key Laboratory of Durability for Civil Engineering,Shenzhen University,Shenzhen 518060,China)

机构地区：[1]深圳大学土木与交通工程学院,广东深圳518060 [2]深圳大学广东省滨海土木工程耐久重点实验室,广东深圳518060

出　　处：《建筑结构学报》2023年第7期80-92,共13页Journal of Building Structures

基　　金：国家自然科学基金项目(51978407,52108159);广东省自然科学基金杰出青年基金项目(2022B1515020037);深圳市国际科技合作项目(GJHZ20200731095802008)。

摘　　要：钢板-混凝土夹芯组合结构可以充分发挥钢材的抗拉性能和混凝土的抗压性能,在冲击荷载下表现出优异的抗冲击性能。采用研发的超轻质高韧性混凝土(ULHDCC)中掺入橡胶粉制备超轻质高韧性橡胶集料混凝土(RULHDCC),并提出采用混合剪力连接件的多层钢板-混凝土夹芯结构,分别从材料和结构角度提升组合板抗冲击性能。通过落锤冲击试验研究发现,夹芯组合板在多次冲击荷载下表现出明显的冲切破坏模式。参数分析表明:采用双层夹芯板和混合剪力连接件可降低结构的冲击破坏程度;增大连接件间距和橡胶粉掺量能提升结构的耗能能力。采用LS-DYNA有限元分析软件对双层组合板的落锤冲击试验进行数值模拟,将多个落锤从不同间隔高度同时下落冲击组合板来模拟多次冲击作用,该方法能够较好地预测多次冲击下夹芯组合板的动力响应。Steel-concrete-steel(SCS)sandwich composite can make the full use of the excellent tensile strength of steel and compressive strength of concrete,leading to excellent impact resistance of the sandwich structure.To further improve the impact performance,on the material side,the study added rubber powder into the ultra-lightweight high-ductility cement composite(ULHDCC)to develop the rubberized ULHDCC,i.e.,RULHDCC;and on the structural side,the study utilized hybrid shear connectors and double-layer sandwich.The drop-weight impact test reveals that the sandwich panel shows an obvious punching failure mode under repeated impact loads.The parametric study reveals that adopting double-layer structure and hybrid shear connectors can reduce the impact damage degree of the structure.Increasing the spacing of shear connectors and the content of rubber can increase the energy absorption ability of the structure.The numerical simulation using LS-DYNA was conducted in the study.It was proposed to simulate the repeated impact in the way of defining multiple drop hammers with different initial heights falling at the same time.The numerical simulation can well predict the failure and dynamic responses of the sandwich subjected to impacts.

关 键 词：双层夹芯板 超轻质高韧性橡胶集料混凝土 落锤试验 多次冲击 数值模拟 失效机理 耗能能力 

分 类 号：TU377.1[建筑科学—结构工程] TU317.1