Experimental study on seismic performance of Steel-PVA hybrid fiber reinforced concrete coupling beam
In order to study the seismic performance of Steel-Polyvinyl Alcohol Hybird Fiber Concrete(SPHFC)precast coupling beams,a low-cycle reciprocating loading test was carried out on one ordinary concrete(RC)precast coupling beam specimen and three SPHFC precast coupling beam specimens to analyze the seismic indicators such as failure process,failure mode,hysteresis performance,stiffness,and energy dissipation capacity of the prefabricated connecting beams.The influence of the matrix material and section width of the connecting beam on its seismic performance was studied,and the failure mechanism of SPHFC prefabricated connecting beams was clarified.The results show that the concrete peeling phenomenon is severe when the RC prefabricated connecting beam is damaged,and ultimately manifests as shear type failure.There is almost no concrete spalling when the prefabricated coupling beam of SPHFC is destroyed,which fully shows the characteristics of multi-crack development of fiber concrete,and finally bending-shear failure occurs.The bearing capacity,ductility,stiffness and energy dissipation capacity of SPHFC coupling beams are much higher than those of RC coupling beam.By increasing the material strength or cross-section width,the bearing capacity of coupling beam is improved,while the ductility and energy dissipation capacity are slightly reduced.The results show that the seismic performance of SPHFC coupling beam is significantly better than that of ordinary RC coupling beam,and the new SPHFC precast coupling beam is simple to manufacture,light in weight and high in strength,which is convenient for prefabrication and hoisting,and can be popularized and applied in assembled structures.
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