Abstract
In steel and concrete composite bridges, it is difficult to perforate the reinforcing bars through the circular holes of conventional perfobond shear connectors with multi-ribs. To ease the installation of perforating rebars, an alternative notched perfobond shear connector was proposed by cutting out the edge of the circular hole. This paper presents the push-out test results of six specimens which were fabricated and loaded to failure. The main purpose was to compare the failure mode, shear capacity and slip behavior of perfobond shear connectors using circular holes and notched holes. Furthermore, 43 nonlinear finite element simulations were performed to further study the effects of several variables, including the hole diameter, the hole distance, the hole number, the cut width, the perfobond thickness, the concrete strength, the rebar diameter, the rebar strength, and the steel strength. The parametric results were generated to evaluate the shear capacity equations for perfobond shear connectors. Finally, an analytical model was developed to estimate the shear capacity of notched perfobond shear connectors.
Highlights
Steel and concrete composite structures are increasingly used in bridge engineering to achieve a balance between structural performance and construction cost
The failure modes were characterized by crack in the concrete slab, yield of the perforating rebar and shear failure of the concrete dowel
Thewas reason that whenstrength higher steel wassteel usedwas for the perfobond rib, the shear strength the steel above the above hole was strength used for the perfobond rib, the shearof strength ofstem the steel stem theincreased, hole was which resulted inresulted greater shear capacity ofcapacity the notched perfobond shear connector
Summary
Steel and concrete composite structures are increasingly used in bridge engineering to achieve a balance between structural performance and construction cost. When perfobondshear shear connectors connectorsare areinstalled installedwith withmulti-ribs multi-ribsparallel parallelto toeach eachother, other,ititisisdifficult difficultto toperforate perforatethe thereinforcing reinforcing bars bars through through many many holes holes of ofthe theribs, ribs,which whichwill willreduce reducethe theconstruction constructionefficiency. To solve solve this this problem, a new type of notched perfobond shear connector was proposed by cutting out the edge problem, a new type of notched perfobond shear connector was proposed by cutting out the edgeof of the thecircular circularhole holeof ofthe theconventional conventionaltype, type,as asshown shownin inFigure. An analytical model was developed to predict the shear capacity of notched perfobond shear in steel and concrete composite bridges.
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