Mechanical Properties of SFHPC after Exposure to High Temperatures  

作　　者：董香军 丁一宁 

机构地区：[1]State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology,Dalian 116024, China Zhejiang Academy of Building Research & Design Co. Ltd.,Hang zhou 310012, China [2]State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology,Dalian 116024, China

出　　处：《Journal of Southwest Jiaotong University(English Edition)》2007年第1期12-19,共8页西南交通大学学报（英文版）

基　　金：The National Natural Science Foundation of China (No.50278013)

摘　　要：The objective of this study is to increase the insight into the mechanical behaviors of steel fiber reinforced high-performance concrete （SFHPC） after exposure to high temperatures. Three types of steel fibers were used and three-point bending tests on notched beams of SFHPC were carried out. The results showed that the flexural toughness and fracture energy of SFHPC increased evidently with the fiber content. The hooked steel fibers with higher strength possess higher flexural toughness and fracture energy than the marked steel fibers with lower strength. After exposure to high temperatures of 300, 600 and 900 ℃ in an electrical furnace, the compressive strength, flexural toughness and fracture energy of SFHPC decreased less than that of HPC without fibers, Both steel fiber content and type had strong influences on the flexural toughness and fracture energy. In addition, the failure patterns of SFHPC beams changed from pull-out of steel fibers at lower temperatures to tensile failure of steel fibers at 900 ℃.The objective of this study is to increase the insight into the mechanical behaviors of steel fiber reinforced high-performance concrete （SFHPC） after exposure to high temperatures. Three types of steel fibers were used and three-point bending tests on notched beams of SFHPC were carried out. The results showed that the flexural toughness and fracture energy of SFHPC increased evidently with the fiber content. The hooked steel fibers with higher strength possess higher flexural toughness and fracture energy than the marked steel fibers with lower strength. After exposure to high temperatures of 300, 600 and 900 ℃ in an electrical furnace, the compressive strength, flexural toughness and fracture energy of SFHPC decreased less than that of HPC without fibers, Both steel fiber content and type had strong influences on the flexural toughness and fracture energy. In addition, the failure patterns of SFHPC beams changed from pull-out of steel fibers at lower temperatures to tensile failure of steel fibers at 900 ℃.

关 键 词：Steel fiber reinforced high-performance concrete （SFHPC） Compressive strength GY High temperature 

分 类 号：TU375[建筑科学—结构工程]