非金属纤维编织网增强超高韧性水泥基复合材料抗剪加固研究

项目名称： 非金属纤维编织网增强超高韧性水泥基复合材料抗剪加固研究

项目编号： No.51508501

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 建筑科学

项目作者： 王冰

作者单位： 浙江大学

项目金额： 20万元

中文摘要： 本项目利用超高韧性水泥基复合材料（简称UHTCC）显著的应变硬化特性和优异的裂缝控制能力，与轻质、高强度、耐腐蚀的非金属纤维编织网结合，开展了非金属纤维编织网增强超高韧性水泥基复合材料（简称TRU）抗剪加固研究。具体内容包括：（1）开展TRU基本力学性能研究：非金属纤维编织网基本力学性能试验研究、非金属纤维编织网与UHTCC基体粘结性能研究、TRU拉伸性能研究；（2）采用单剪试验研究纤维编织网与UHTCC之间、TRU层与老混凝土之间的界面粘结性能；（3）开展TRU加固RC梁的抗剪受力性能和耐久性研究。研究采用试验与有限元模拟、理论推导相结合的方法，建立纤维束与UHTCC基体粘结滑动模型、TRU材料本构模型、TRU与老混凝土之间的粘结强度计算公式和TRU增强RC梁的抗剪承载力计算公式。本项目旨在解决传统加固材料一些局限性问题，为指导TRU加固钢筋混凝土结构的抗剪设计奠定理论和设计基础。

中文关键词： 非金属纤维编织网增强超高韧性水泥基复合材料；钢筋混凝土梁；力学性能；界面粘结性能；剪切性能

英文摘要： Ultra high toughness cementitious composite (UHTCC) overlays can be used for durability repair of deteriorated concrete structures since they have a strain hardening property and multiple cracking behaviors. Textile can be applied for the improvement of bearing of concrete structures since they have a light weight, high tensile strength and better corrosion resistance. The project aims to develop a new composite system, textile reinforced ultra high toughness cementitious composite (TRU), and evaluate the mechanical behavior of TRU and shear strengthening of RC beams with TRU. The detailed contents of this project are as follows: (1) mechanical property tests of TRU, including mechanical tests of textile, bond tests of the interface between the textile and UHTCC substrates, direct tension tests; (2) single shear tests between TRU and old concrete substrates; (3) shear bearing capacity tests and durability tests of RC beams reinforced with TRU. Three methods could be used, including test method, finite element method and formula method. And then, two models could be determined, including bond-slip model for textile/UHTCC and constitutive model for TRU. Two formulae would be derived, including bond-slip formulae for TRU/concrete and shear formulae for RC beams reinforced with TRU. In this project, attempts are made to solve some limitation problems for traditional reinforced materials and develop shear design theories to facilitate the practical implementation of such a new TRU strengthening system.

英文关键词： Textile reinforced ultra high toughness cementitious composite;reinforced concrete beam;mechanical behavior;interfacial bond property;shear property