The national standard about reactive powder concrete (RPC ) products,Reactive Powder Concrete (GB/T 31387—2015),has been issued in 2015,but there is no any technical specification about the structural design of RPC structures in present China.With the compiling of Hunan provincial standard of Technical Specification for Reactive Powder Concrete Structures,the main design methods of Ultra-high performance RPC structures were discussed, and the main contents and some design consideration were introduced. By introducing the influence coefficient about steel fiberβv ,βp ,βw ,βB respectively and based on the reliability,the shear bearing capacity,punching shear capacity,crack width and deflection calculation formula were acquired.The results show that the standard values of axial compressive strength and initial crack strength of the RPC are 0.7 times and 0.047 times of cube compressive strength respectively.The tensile strength is related to fiber volume and fiber shape parameters,and the influence coefficient of steel fiber on axial tensile strength is 0.15.Elastic moduli of RPC100-RPC180 are between 40.0-48.6 GPa.Due to safety,the rules about flexural bearing capacity don't consider the tensile contribution of RPC in the tension zone.%鉴于中国有关活性粉末混凝土RPC制品方面的国家标准《活性粉末混凝土》(GB/T 31387—2015)已于2015年颁布执行,但目前尚无活性粉末混凝土结构设计规程,结合湖南省工程建设地方标准《活性粉末混凝土结构技术规程》(简称规程)的编制,对超高性能活性粉末混凝土结构的主要设计方法进行了讨论,并介绍了《规程》主要内容及若干设计考虑,通过分别引入钢纤维影响系数βv,βp,βw,βB,并基于可靠度分析得到了RPC构件抗剪承载力、抗冲切承载力、裂缝宽度、刚度计算公式.研究结果表明:RPC轴心抗压强度及轴心抗拉初裂强度标准值分别为对应立方体抗压强度的0.7倍及0.047倍;轴心抗拉强度与纤维体积掺量、纤维形状参数相关,钢纤维对轴心抗拉强度的影响系数为0.15;RPC100~RPC180弹性模量取值在40.0~48.6 GPa之间;《规程》偏安全地不考虑受拉区活性粉末混凝土抗拉作用对抗弯承载能力的贡献.
展开▼
