How rectangular hollow section joints made of high-strength steels behave when fatigued The European Commission, Directorate General XII, has recently published a report entitled " Fatigue behaviour of rectangular hollow section joints made of high-strength steels ". It is one in a series of ten reports on properties and in-service performance in the field of tec... The European Commission, Directorate General XII, has recently published a report entitled " Fatigue behaviour of rectangular hollow section joints made of high-strength steels ". It is one in a series of ten reports on properties and in-service performance in the field of technical steel research. The publication is the final report on this project. It includes all test results for the fatigue behaviour of steel tested under both constant and variable amplitude loads. The authors of the report have compared their findings, regarding fatigue life, with dependence on the different materials' qualities.