摘要
为了探究活性粉末混凝土材料(RPC)在隧道管片方面的应用,通过对RPC梁进行抗弯试验,研究了厚度和配筋对RPC梁抗弯性能的影响,对比分析了不同参数下RPC试验梁的破坏特性、承载力、弯矩-挠度和弯矩-应变关系的变化规律,进而探究RPC作为衬砌管片材料的优越性。研究结果表明:在常温下配制养护RPC构件,其立方体抗压强度可达到130 MPa;少量配筋能够增加RPC构件的变形,提高延性;适量配筋能够显著提高RPC构件的抗弯承载力和变形,但减小厚度对适量配筋RPC构件的变形和抗弯承载力影响较小;掺加的钢纤维承载部分荷载,使得RPC应用于管片中可减少钢筋用量和厚度。
In order to explore the application of reactive powder concrete in tunnel lining segment,the bending tests were performed to analyze the effect of thickness and reinforcement on flexural behavior of RPC beams. The failure characteristics,the bearing capacity,the relationship between moment and deflection and the relationship between moment and strain of RPC test beams were compared with different parameters to explore the superiority of RPC as the material of tunnel lining segment. It was shown that the cube compressive strength of RPC members prepared under room temperature curing reached to 130 MPa. A small amount of reinforcement in RPC specimens could increase the deformation and ductility. Moderate amount of reinforcement reinforced in RPC specimens could significantly improve the flexural bearing capacity and deformation,but reducing thickness had little influence on the deformation and flexural capacity of RPC specimens with moderate amount of reinforcement. The steel fibers could bear partial loads so that the decrease of the magnitude of steel bars and thickness could be achieved when applied in tunnel lining segment.
出处
《工业建筑》
CSCD
北大核心
2017年第7期83-88,174,共7页
Industrial Construction
基金
国家自然科学基金项目(51378168)
关键词
活性粉末混凝土
隧道衬砌管片
承载力
变形
reactive powder concrete
tunnel lining segment
bearing capacity
deformation
