Strengthening of Steel Girder Bridges w/ Carbon Composites Laminates

9521652名用户本项目将通过试验和分析论证用环氧碳纤维片材加固加固钢混凝土组合桥钢梁的可行性。为了提高梁的抗弯能力，碳纤维板或碳纤维带被环氧胶粘结到梁的抗拉翼缘上。对于翻新，这种材料被环氧胶粘结到梁的拉伸法兰上，这可能包含预先存在的疲劳裂纹。三根梁将在静载下进行试验，以确定混凝土桥面、钢梁、碳纤维带和环氧树脂的组合截面的抗弯强度。这将调查：具有预先存在的疲劳裂纹的正弯矩区域的疲劳强度；作为施加应力范围的函数的疲劳强度；根据AASHTO的标准类别对疲劳强度进行分类；以及改装以阻止疲劳裂纹扩展的能力。这个项目是亚利桑那大学和伍斯特理工学院的合作项目。所有的全面测试都将在亚利桑那大学进行。优惠券测试将在伍斯特理工学院进行。这两个机构的调查人员将对结果进行分析，并制定应用这项技术的准则和方法。***

9521652 Demers This project will demonstrate experimentally and analytically the feasibility of strengthening and retrofitting steel girders in composite steel concrete bridges with epoxy bonded carbon fiber laminates. To upgrade the flexural capacity, carbon fiber plates or tapes are epoxy bonded to the girder tension flange. For retrofitting, this material is epoxy bonded to the girder tension flange which may contain pre-existing fatigue cracks. Three beams will be tested under static loading to determine the flexural strength of a composite section of concrete deck, steel girder, carbon fiber tape, and epoxy. This will investigate: Fatigue strength in the positive moment region with pre-existing fatigue cracks; fatigue strength as a function of applied stress range; classification of fatigue strength according to the AASHTO's Standard Categories; and the ability of retrofit to arrest fatigue crack growth. This project is a joint effort between the University of Arizona and the Worcester Polytechnic Institute. All full- scale tests will be conducted at the University of Arizona. The coupon tests will be performed at the Worcester Polytechnic Institute. The analysis of results and development of guidelines and methodology for application of this technique will be performed by the investigators at both institutions. ***