详情

Shear Capacity of Texas Standard Prestressed Beams from Strut & Tie Models of Beam Ends

项目名称：	Shear Capacity of Texas Standard Prestressed Beams from Strut & Tie Models of Beam Ends
摘要：	Article 5.7.3.2 of AASHTO LRFD includes design guidance for sections near supports. This AASHTO design provision, i.e., the 0.18 f 'c limit, has been put in place to ensure that the complicated nature of stresses are accounted for while transferring the forces in the B-region to the simply supported ends of pretensioned girders. The 0.18 f 'c shear stress limit can be exceeded if load transfer into the supports can be justified by appropriate strut and tie models (STMs). Bridge designers find these STMs to be difficult to create. For Tx-Girders near their span limit, the bottom flange is nearly full of prestressing steel, and the web will have harped strands over a significant height. For U-beams, X-beams, slab beams, decked slab beams, and box beams, there will be many debonded strands to different lengths in addition to strands bonded over the entire beam length.This project aims to create a series of strut-and-tie models (STMs) for the end regions of Tx-Girders, U-beams, box beams, X-beams, slab beams, and decked slab beams. These STMs will be used to study the interaction between shear, flexure, and the anchorage of longitudinal tie(s) with the ultimate goal of deriving simplified shear stress limits.
状态：	Active
资金：	399,736
资助组织：	Texas Department of Transportation<==>Federal Highway Administration
项目负责人：	Steele PMP, CTCM, Joanne
执行机构：	Center for Transportation Research
开始时间：	20190717
预计完成日期：	20211031
主题领域：	Bridges and other structures；Design