Study On Statical And Fatigue Properties Of Perfobond Rib Shear Connectors

Steel-concrete composite beam is made of steel beam and reinforced concrete bridge beam. In order to guarantee the characteristics of the two materials are fully played, shear connectors are needed to set between the two materials.In this article, we reserched a new kind of shear connectors—perfobond rib connector. To know its mechanical characteristics, we mainly through ways of experimental instrument and finite element analyses. The test contains two parts:push-out test and beam test of PBL connector. The paper is based on the item of National Natural Science Fund "The remaining mechanical properties research of steel-concrete composite beam which is under fatigue accumulation damage".9 push-out specimens were produced, among them 3 specimens were used for static tests, the rest were used for fatigue test.4 beams with PBL connectors were also produced, only 1 specimen was used for static tests, the others were used for fatigue test. We mainly studied its static performance, fatigue failure mechanism and the remaining mechanics after fatigue loading.The paper has the following results:(1) the static failure mode of PBL push-out tests are as follows:concrete in the hole is crushed, besides, one side of the steel bar was cut off, the other was yield, in the same time, joist steel and concrete separated obviously. When PBL connector damaged, the slippage can achieve to 40mm, this illustrates that PBL connector has high ductility. (2) PBL push-out specimens have good fatigue performance, so this aspect can be ignored in engineering design. Also, its remaining shear capacity decreased after fatigue loading, the ralationships between its remaining shear capacity and number of loops are quadratic parabola. (3) the static failure mode of beams with PBL connectors are as follows: concrete in mid-span was crushed, and steel beam at the bottom was yield. Meanwhile, the longitudinal throughout cracks were appearing on the top of concrete.In the same time, we used one of the finite element softwares named ABAQUS to simulate the static performance of PBL connector and PBL beam. In the article we use the solid element to establish the model, we build push-out specimen of one fouth and beam specimen of one-half. Corresponding constrait conditions and contact relationship were applied and we need to mesh fine for key position. At last we make a contrast with test results and verify the reliability of the finite element calculation results.. The parametric analysis was also carried out to analyse the factors which affect the bearing capacity of PBL connector.