用复合材料加固预应力混凝土梁：安装，设计和检查

用复合材料加固预应力混凝土梁：安装，设计和检查(中文12000字,英文7600字,英文PDF)
Owen Rosenboom a、Catrina Walter b、Sami Rizkalla b,*
a香港理工大学土木工程系，中国香港
b北卡罗来纳州立大学土木工程系，罗利，北卡罗来纳州27695，美国
摘要
纤维增强聚合物（FRP）或钢增强聚合物（SRP）材料在增强/预应力混凝土构件的拉力侧的应用已经被认为是增强承载能力的强化技术，并且在某些情况下可以增强构件的适用性。正确安装和定期检查复合材料（FRP或SRP）强化系统非常重要，因为粘接质量对内部传递力至关重要。本文描述了一个实验程序，用于研究六种预应力混凝土桥梁的性能，这些梁在静态和疲劳载荷条件下进行了测试。测试结果与作者测试的16个其他梁的结果相结合，以制定结构设计指南和复合材料加固系统的安装和检查指南。还使用价值工程来检查行为，通过调查整体系统性能来评估成本效益。研究结果表明，SRP材料在结构上比碳FRP（CFRP）材料更有效。检查演示程序的结果，包括超过150个CFRP样品的拉脱测试，表明最有效的检测技术是目视检查，拉脱测试和声学探测。
关键词：预应力;强化;安装程序;纤维增强聚合物;钢筋聚合物;桥梁;检验程序;价值工程

Strengthening of prestressed concrete girders with composites: Installation, design and inspection
Owen Rosenboom a, Catrina Walter b, Sami Rizkalla b,*
aDepartment of Civil Engineering, Hong Kong Polytechnic University, Hong Kong, China bDepartment of Civil Engineering, North Carolina State University, Raleigh, NC 27695, USA
Abstract
The application of fibre reinforced polymer (FRP) or steel reinforced polymer (SRP) materials to the tension side of a reinforced/prestressed concrete member has been accepted as a strengthening technique to increase the load carrying capacity and in some cases can enhance member serviceability. Proper installation and regular inspection of a composite (FRP or SRP) strengthening system is important since quality of the bond is essential to internally transfer forces. This paper describes an experimental programme conducted to study the behaviour of six prestressed concrete bridge girders, which were tested under static and fatigue loading conditions. The test results were combined with the results of 16 other girders tested by the authors to develop structural design guidelines and guidelines on the installation and inspection of composite strengthening systems. The behaviour was also examined using value engineering to evaluate the cost-effectiveness by investigating the overall system performance. Research findings indicate that SRP materials are more structurally efficient than carbon FRP (CFRP) materials. The results of an inspection demonstration programme, including the pull-off testing of over 150 CFRP samples, has shown that the most effective inspection techniques are visual inspection, pull-off testing, and acoustic sounding.
 2007 Elsevier Ltd. All rights reserved.
Keywords: Prestressed; Strengthening; Installation procedures; Fibre reinforced polymers; Steel reinforced polymers; Bridge girder; Inspection procedures; Value engineering