超高性能混凝土结构的设计方法  

Design Principles for Ultra-high Performance Concrete Structures

作　　者：方志[1] 郑辉[2] 杨剑[3] 苏捷[1] 黄政宇[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]湖南工业大学土木工程学院,湖南株洲412007 [3]中南大学土木工程学院,湖南长沙410012

出　　处：《建筑科学与工程学报》2017年第5期59-67,共9页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(51608189;51078134);湖南工程建设地方标准制(修)订项目(BZ201509)

摘　　要：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β_v,β_p,β_w,β_B,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40.0~48.6GPa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。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 fiber βv,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.

关 键 词：超高性能混凝土 活性粉末混凝土 结构设计 技术规程 设计方法 

分 类 号：TU528[建筑科学—建筑技术科学]