Tests of large bridge columns. . PRICE. 30 CENTS Sold only by the Superintendent of Documents, Government Printing OfficeWashington, D. C. WASHINGTON GOVERNMENT PRINTING OFFICE 1918 APR 1 7 • * • • • • • ? • • • ? • • • • • a •• e . e • TESTS OF LARGE BRIDGE COLUMNS By J. H. Griffith and J. G. Bragg CONTENTS Page I. Introduction 4 i. General 4 2. Description of apparatus 6 (a) Testing machine 6 (6) Preparation for tests 7 (c) Calibration and accuracy of the testing machine 8 3. Purpose and scope of the investigation 8 (a) Column strain in general 8 (6) End conditions 10 (c) Selection of observ
Tests of large bridge columns. . PRICE. 30 CENTS Sold only by the Superintendent of Documents, Government Printing OfficeWashington, D. C. WASHINGTON GOVERNMENT PRINTING OFFICE 1918 APR 1 7 • * • • • • • ? • • • ? • • • • • a •• e . e • TESTS OF LARGE BRIDGE COLUMNS By J. H. Griffith and J. G. Bragg CONTENTS Page I. Introduction 4 i. General 4 2. Description of apparatus 6 (a) Testing machine 6 (6) Preparation for tests 7 (c) Calibration and accuracy of the testing machine 8 3. Purpose and scope of the investigation 8 (a) Column strain in general 8 (6) End conditions 10 (c) Selection of observation stations—Extensometers 10 (d) Pin-plate observations 13 (e) Lattice-bar observations 13 (/) Repetitions of load—Initial strain 13 (g) Deflections 14 (h) Analysis of data 14 II. Original data of investigation 15 1. Description of test columns 15 2. Chemical and physical tests 16 III. Results of tests 16 1. Description of tables and curves 16 2. Explanatory note on tables and curves
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