In this technical report, a Bureau of Standards study details experiments on 18 large bridge columns. The specimens came from several bridges and used different steel types, with half the size of the actual bridge members. The work aimed to quantify strength under intended axial loads and to map how stress and strain spread through the shafts and their details. The researchers also explored how test results could inform real‑world bridge design and construction.

Two main goals guided the work: determine maximum strength and analyze stress patterns in the columns. The project involved collaboration with consulting engineers and steel producers, and it documents how results fed into later design modifications for actual bridges. It also outlines the observation plan and how strain data were collected during testing.

How a high‑capacity compression machine applies load to long columns and how speed affects testing

Methods for measuring strain and monitoring column behavior as failure approaches

Variations in column design and material used across several bridges

Ideal for readers of structural engineering, bridge design history, and materials testing.

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