Uniform Corrosion Wastage Effects on the Load-Carrying Capacity of Damaged Steel Beams

Abstract

ABSTRACT:The aim of the present study is to investigate the effects of uniform corrosion on the load-carrying capacity of steel beam sections. In this paper, a credible corrosion model for damaged steel beams has been developed based on the real existing data. Thickness loss data were compiled from corrosion damaged samples beams which picked up from a petrochemical industry. The developed deteriorated model was employed to demonstrate the effects of uniform corrosion on the structural behavior of damaged steel beams due to uniform corrosion wastage. It was found from the obtained results that the lateral distorsional buckling is the critical failure mode at the preliminary age of corrosion wastage.

Service Life Evaluation Experience for Existing Railway Steel Bridge in China

“…is stress range related to a stress spectrum in a short test period; 1 k is the adjustment factor considering eccentricity of vertical load; 2 k is the adjustment factor of considering some special heavy train which do not operate in short-term test period; 3 k is the stress conversion factor between the evaluated detail and the actual test detail; 4 k is the adjustment factor of considering the difference of locomotive and vehicle types between the test period and the service period (If the stress history is directly corrected by referencing to pervious similar test or simulating calculation, 4 k is taken as 1.0. ); 5 k is the adjustment factor of considering secondary stress.…”

“…is the number of stress cycle related to a stress spectrum in a short test period; 1  is the adjustment factor of considering the different daily traffic volume within one month; 2  is the adjustment factor of considering the different monthly traffic volume within one year; 3  is the adjustment factor of considering the different yearly traffic volume during entire service period; 4  is the adjustment factor corresponding to vehicles gross weight change in every train, which closely linked to the locomotive traction gross weight, and is given in Table 1. After correcting the stress range and their numbers of cycles in each operation period, the operation stress range spectrum during bridge service condition can be determined.…”

“…2 k can be determined by train formation during the service period. The strain gauges of the main beams were placed in the gross section, so 3 k for the main beam is the area ratio of gross and net section. The strain gauges of the floor beams were placed in the net section, so 3 k for the floor beam is taken as 1.0.…”

“…Along with the growth of the traffic volume and the traffic flow rate coupled with environment actions [3], it is the matter of concern for the bridge engineers how to evaluate the safety and the fatigue remaining life of the existing steel bridges, and it is also an important research topic in current railway bridge professions.…”

Fatigue Load Model for Highway Bridges in Heavily Loaded Areas of China

“…The fatigue behavior and bearing capacity are greatly influenced by the coupled actions of material degradation, vehicle load and environment [1]. Thus, it is necessary to find a method for fatigue analysis that considers real traffic load history.…”