Collapse behavior of steel railing post considering installation and replacement on CLT deck

Abstract

While CLT(Cross-Laminated-Timber), which is lightweight and is resistant to fa- tigue, is expected to apply to bridge deck, it is needed to install commercially avail- able railing post on it for popular use. It is important to confirm the safety and to investigate the load bearing performance of the joint part between the railing post and the CLT deck. In this study we propose replaceable railing post fixed by lug screw bolt so that we can only replace the upper part of railing post after fracture. We show relatively simple modeling of the CLT deck with the railing post using general- purpose 3D FEM tool and illustrate the numerical results. The modeling considering elasto-plasticity for steel members and orthotropy for CLT member seems to well simulate the deformation behavior of the CLT deck with the railing post.