Tests on the effective column lengths of web members in a CHS lattice girder

This paper presents the results of tests to study the effective column lengths of web members in a CHS lattice girder. These tests have been carried out for two purposes. The first purpose is to obtain data about the effective column length of web members in a CHS lattice girder for geometrical parameters outside of the range of existing test results. The second purpose is to examine whether the validity range of the out-of-plane rotational stiffness equation in AIJ could be extended to the range represented in the current tests. Both purposes are intended to contribute to a more reliable and comprehensive equation for out-of-plane effective column lengths of web members in a CHS lattice girder.