Prestress recovery of steam-cured pretensioned concrete members, M.S. thesis, June 1976

INTRODUCTION 1.1 Purpose and Scope 1.2 Background 1.3 Experimental Program 1.3.1 Fabrication of Specimens 1.3.2 General Testing Program FABRICATION AND TESTING 2.1 Fabrication Program 2.2 The Steam Curing 2.3 Testing Program THEORETICAL ANALYSIS 3.1 Preliminaries 3.1.1 Loading Arrangement 3.2 Experimental Analyses 3.2.1 Cracking Moment 3.2.2 Ultimate Moment 3.2.3 Concrete Fiber Stress at Cracking 3.3 Analysis of Gage Data 3.3.1 SR-4 Strain Gages 3.3.2 Clip Gages iv Page 1 2 2 4 6 6 8 10 10 14 15 18 18 18 . 20 20 21 22 24 24 25 TABLE OF CONTENTS (continued) Page 4. TEST RESULTS AND DISCUSSION 26 4.1 General 26 4.2 Observations During Fabrication 27 4.3 Flexure Test Results 30 4.4 Comparisons 33 5. CONCLUSIONS AND RECOMMENDATIONS 35 6. TABLES 37 7. FIGURES 45 8. REFERENCES 53 VITA 54