Residual strength at −40 °C of a precracked cold‐formed rectangular hollow section made of ultra‐high‐strength steel – an engineering approach

Abstract

This study investigated the residual strength of a precracked cold‐formed rectangular hollow section made of novel ultra‐high‐strength steel. The primary goal was to experimentally discover the residual strength of the structure when used in low temperature service conditions. The secondary goal was to predict the residual strength by using a J‐integral approach with nonlinear finite element calculations and to compare these predictions with measured results. The experimental tests were carried out with a beam in four‐point bending loading. The test specimens were taken from a cold‐formed rectangular hollow section fabricated from direct quenched (untempered) ultra‐high‐strength steel S960 QC omitting the annealing in the fabrication process. The tests for final failure were carried out at −40 °C, with the exception of the first pilot test. There were two kinds of tests: (1) the beam was cyclically loaded until the final fracture or the fatigue precrack was first introduced and (2) the specimen was then subjected to a quasistatic bending loading condition until it failed. The new experimental results matched well with our predictions, and both confirmed the high toughness of ultra‐high‐strength steel in beam construction studied, even at a low ambient temperature.

Steel and composite structural shells in the construction of high-rise building

“…In the twentieth century bearing shells were widely adopted in construction, and the number of projects with this scheme was increasing each decade. Therefore, new problems and difficulties in the construction appear in process of bearing shell technology development , but many of them are already well studied [29][30][31][32][33][34][35][36][37].…”

Buckling Behavior of Cold-Formed Studs with Thermal Perforations

“…Prokic [27][28][29] analyzed the behavior of thin-walled open section I-beams under torsion and bending. Björk [30][31][32] studied the influence of residual stresses on the fatigue strength of CFS rectangular hollow sections. Ungermann [33,34] dealt with experimental and numerical investigations on plain channels subjected to coupled instabilities.…”