Lapped bar splices in concrete beams

Abstract

An investigation was conducted to determine the general hehavior and strength of lapped bar splices that varied in length and method of lapping. The bond strength developed in the splice and the slip of bar were determined for two types and two sizes of reinforcement. The resulting data clearly illustrated the manner in which the stress was transferred from one lapped bar to the other; the relative merits of the two types of bars, as well as the effectiveness of the two methods of lapping, are also shown. CONTENTS I. Introduction __ _______________ ___ __ _________-_________ __ __ _ 1. Object and scope of investigation __________ _________ _________ _ II. Description of test specimens __________ _____ _____________ ____ ____ _ 1. Design of beams ____ ____ ___ __________ ___ _______________ ___ _ 2. Construction of specimens _________ ________________________ _ III. Description of tests ______ __ ___ ______________ _________ ___ _______ _ 1. Procedure _____________ ___ _______ ________________________ _ IV. Test results of series A _____ _________ ___ ___ ___ ___________________ _ 1. Distribution of stress along lapped bars _____________ __ ______ _ 2. Bond strength ______ ___ ____ __ ____ ____ ___ ______________ ___ _ 3. Comparison between methods of lapping ______ ______ ____ ____ _ 4. Distribution of slip along lapped bars _______________ __ ______ _ V. Test results of series B __________________ ______ ___ ___ ___________ _ 1. General manner of failure _______________ _________ ___ ____ ___ _