Shear design of high strength concrete prestressed girders

作     者：Emad L. LABIB Hemant B. DHONDE Thomas T. C. HSU Y. L. MO 

作者机构：Oil Field Development Engineering LLC Houston TX 77079 USA Department of Civil Engineering VIIT University of Pune Pune 411007 India Department of Civil and Environmental Engineering University of Houston Houston TX 77004 USA 

出 版 物：《Frontiers of Structural and Civil Engineering》 (结构与土木工程前沿（英文版）)

年 卷 期：2014年第8卷第4期

页      面：373-387页

核心收录：

学科分类：1305[艺术学-设计学（可授艺术学、工学学位）] 081406[工学-桥梁与隧道工程] 08[工学] 081304[工学-建筑技术科学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0813[工学-建筑学] 0814[工学-土木工程] 082301[工学-道路与铁道工程] 0823[工学-交通运输工程] 

基　　金：support provided by the Texas Department of Transportation (TxDOT) through TxDOT 

主　　题：shear design high strength concrete prestressed girders full-scale tests 

摘      要：Normal strength prestressed concrete I-girders are commonly used as the primary superstructure components in highway bridges. However, shear design guidelines for high strength PC girders are not available in the current structural codes. Recently, ten 7.62 m （25 feet） long girders made with high strength concrete were designed, cast, and tested at the University of Houston （UH） to study the ultimate shear strength and the shear concrete contribution （Vc） as a function of concrete strength （f＇c）. A simple semi-empirical set of equations was developed based on the test results to predict the ultimate shear strength of prestressed concrete I-girders. The UH-developed set of equations is a function of concrete strength （√f＇c）, web area （bwd）, shear span to effective depth ratio （a/d）, and percentage of transverse steel （Pt）. The proposed UH-Method was found to accurately predict the ultimate shear strength of PC girders with concrete strength up to 117 MPa （17000 psi） ensuring satisfactory ductility. The UH-Method was found to be not as overly conservative as the ACI-318 （2011） code provisions, and also not to overestimate the ultimate shear strength of high strength PC girders as the AASHTO LRFD （2010） code provisions. Moreover, the proposed UH-Method was found fairly accurate and not exceedingly conservative in predicting the concrete contribution to shear for concrete strength up to 117 MPa （17000 psi）.