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Implementation of Negative Moment Reinforcement Detail Recommendations TR-723

项目名称：	Implementation of Negative Moment Reinforcement Detail Recommendations TR-723
摘要：	Prestressed concrete girder bridges have historically been designed with negative moment reinforcement in order to resist loads after full continuity is achieved. The Iowa DOT Office of Bridges and Structures Bridge Design Manual calls for additional longitudinal, so called b2, bars for resistance to negative moments caused by super-imposed dead loads and live loads. In an attempt to determine if current negative moment reinforcement requirements are overly conservative, a previous study performed by Iowa State University found that the amount of so-called b2 reinforcement for negative moment regions of prestressed girder bridges may not be needed to the level currently specified (Phares et al. 2015). This finding is particularly important because current design approaches were indicating that increasing amounts of reinforcement were needed - causing both construction difficulties and increasing overall bridge costs. The goal of this project would be to evaluate the performance of a yet-to-be-constructed bridge on E57 over I35 that utilizes both current b2 amounts and the proposed reduced amounts. This would allow for the comparison of the behavior of sections with varying amounts of negative reinforcement present to help determine what requirements are necessary in the negative moment region of prestressed concrete girder bridges.
状态：	Active
资金：	149197
资助组织：	Iowa Department of Transportation
管理组织：	Iowa State University, Ames
执行机构：	Iowa State University, Ames
主要研究人员：	Phares, Brent
开始时间：	20170501
预计完成日期：	20210430
实际结束时间：	0