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Evaluate the Deployment of High Strength Reinforcing Steel in Texas

项目名称：	Evaluate the Deployment of High Strength Reinforcing Steel in Texas
摘要：	Recent editions of the AASHTO LRFD Bridge Design Specifications have adopted code updates to implement reinforcing steels with yield strengths up to 100 ksi. In practice, 80 ksi and 100 ksi steels are available and may have variations in cost due to local availability and fabrication cost. TxDOT has not adopted these higher strength reinforcing steels in practice. Among the reasons include gaining comfort level with implementing new technologies and techniques, potential need for enhanced TxDOT requirements beyond the specifications, and an aversion to passively reinforced structural elements that result in higher reinforcement stress and resultant cracking that might be visually concerning, or a durability concern regardless of allowances in code provision. Researchers will examine the range of pretensioned / post-tensioned / reinforced concrete bridge components and systems typically used in Texas and will identify specific components or areas that would benefit from the use of high strength reinforcement. The research team will conduct example calculations and designs that demonstrate improvements in economy and/or load carrying capacity that might be realized comparing conventional Grade 60 reinforcing, Grade 80 reinforcing, and Grade 100 reinforcing. A specific case of a straddle bent that might be considered for post-tensioned versus conventionally reinforcing concretes will be examined. The researchers will synthesize the range of research and testing conducted on the service-level cracking performance of designs using high strength reinforcing steel and identify potential data gaps in this area. If data gaps exist, develop a testing or analytical program to fill these data gaps to provide additional requirements beyond code-based requirements for implementation in Texas bridge design practice.
状态：	Active
资金：	999,898
资助组织：	Texas Department of Transportation
项目负责人：	Dassi, Martin
执行机构：	Center for Transportation Research
开始时间：	20200901
预计完成日期：	20230831
主题领域：	Bridges and other structures；Hydraulics and Hydrology