Study on seismic behavior of ultra-high performance concrete composite shear wall with precast slab
Based on the seismic performance test of one common shear wall and four ultra-high performance concrete(UHPC)prefabricated composite shear walls,the hysteretic properties,bearing capacity,ductility,stiffness,and energy dissipation capacity were studied.The effects of width-to-height ratio,replacement by expanded polystyrene(EPS)and vertical reinforcement connection on the seismic performance were analyzed.The results show that compared with the common shear wall,the UHPC composite wall has excellent seismic performance and the maximum bending capacity increases.The UHPC prefabricated slab and steel truss can work well with the concrete in the cavity.The hysteretic curve,skeleton curve and stiffness degradation curve of UHPC composite wall are basically consistent with the trend of common shear wall.In the range of the ratio of height to width,the smaller the ratio of height to width,the greater the flexural capacity and stiffness of the composite wall of UHPC,and the worse the energy dissipation.Replacement by EPS can improve the energy dissipation capacity of composite shear wall after yield,but reduce the ductility of UHPC composite wall.Only using the vertical reinforcement of the concealed column to connect with the base has little effect on the flexural capacity and energy dissipation of the UHPC composite wall,but it can facilitate the construction greatly.
UHPC prefabricated cast slabcomposite shear wallseismic performancereplacement by EPSconnecting steel bar
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