UHPC在混凝土梁的加固应用研究进展-《福建工程学院学报》

文章信息/Info

Author(s):: LIN Shangshun; CHEN Kedan; WU Chen; XU Xiaoming; Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering, Fujian University of Technology

摘要:: 超高性能混凝土(Ultra-High Performance Concrete，UHPC)已经在混凝土结构的加固中得到广泛的应用。对在役混凝土梁常见的病害及工程中常用加固方法的优缺点，以及UHPC应用于混凝土梁加固的技术可行性、优缺点、应用前景进行分析，并对既有的UHPC加固梁的施工工艺、受力性能及计算方法等进行综述。研究结果表明:与传统的加固方法相比，采用UHPC对钢筋混凝土梁进行加固，无论在技术可行性、结构耐久性和工程造价方面，均存在明显的优势；与未加固的混凝土梁相比，UHPC 加固梁的承载能力和刚度等力学性能均大幅提高，且对旧桥自重的影响有限；其加固施工工艺是影响增大截面加固效果的重要因素，需结合工程案例开展系统研究；由于加固结构大多已服役数年，在计算加固构件的承载力时，初始损伤对结构承载力的折减是今后需要重点研究的问题。

Abstract:: Ultra-high performance concrete (UHPC) has been widely used in the reinforcement of concrete structures. The common diseases of in-service concrete beams and the advantages and disadvantages of commonly used reinforcement methods in engineering, as well as the technical feasibility, advantages and disadvantages, and application prospect of UHPC applied to the reinforcement of concrete beams were analyzed. The construction technology, mechanical properties and calculation methods of existing UHPC reinforced beams were reviewed. Results show that compared with the traditional reinforcement method, UHPC has obvious advantages in terms of technical feasibility, structural durability and engineering cost for the reinforcement of reinforced concrete beams. Compared with the unreinforced concrete beams, the mechanical properties such as bearing capacity and stiffness of UHPC reinforced beams are greatly improved, and the influence on the dead weight of the old bridge is limited. Its reinforcement construction technology is an important factor affecting the reinforcement effect by increasing section area, which needs further systematic research combined with engineering cases. Since most of the reinforced structures have been in service for several years, how to consider the reduction of the bearing capacity of the structure due to the initial damage when calculating the bearing capacity of the reinforced members is a key issue that needs to be studied in the future.