Experimental Research On Frame-shear Wall Structure Based On Different Column-wall Connection Ways

Prefabricated concrete structure has many advantages,such as high construction speed,quality,energy conservation and environmental protection,and it is the developing direction of the future architecture.Reinforced concrete frame-shear wall structure,flexible in architectural layout,strong adaptability in function,meeting the three requirement of aseismic design(statically indeterminate,good ductility,multi-channel line)on structure,is widely used in multi-storey and high-rise reinforced concrete buildings.But because of the difficulty of split and connection of the reinforced concrete frame-shear structure,it leads to being almost in a blank state on the research and application of the industrialized production methods.As a part of a five-year national science and technology support plan subject(2011BAJ10B04),on the basis of the finished basic experiment of the wall-column connection and beam-wall connection,this study carried out series of experiment research of the overall structure of the reinforced concrete frame-shear structure.As a part of it,the purpose of the test research has the following two points:(1)For the purposes of using prefabricated building ways,we put forward a connection scheme of replacing double row steel of vertical distribution with single row steel of large diameter and large spacing in the frame-shear wall.Through the tests of RC1 specimen and RC2 specimen,we analyze the similarities and differences of bearing capacity,stiffness,deformation capacity and failure form of the structure,the feasibility of equivalent steel scheme is validated.(2)The column-wall connection is mainly refers to how the double-sided horizontal distribution of reinforcement in shear wall is connected to the column.Not only does it affect mechanics performance of the prefabricated frame-shear wall structure,but it is also directly related to construction difficulty level of break-up and the assembly of the structure.Based on specimen RC1,double-sided horizontal distribution of reinforcement in shear wall through column-wall as a benchmark,the article designed and produced ?specimen PC 1,column-wall cast-in-situ belt and double-sided horizontal distribution of reinforcement in shear wall on lap connection,?specimen PC2,neither cut-through nor connection between double-sided horizontal distribution of reinforcement in shear wall,setting with slot vertical joint between the column and wall with grouting,by contrast,to explore the possibility of simplifying the column-wall connections and the impact on the structure.The research method is priority to experimental study,combined with nonlinear finite element simulation.Based on one span of two layers of reinforced concrete frame-shear wall structure as the object,the article uses 1/2 scale model.In addition to the column-wall joint practices,other parts are all made of cast-in-situ.Loading mode is the low cycle reciprocating horizontal loading under the fixed vertical load(axial compression ratio of about 0.28).Finite element simulation used WCOMD software developed by the University of Tokyo in Japan,considering material and geometric nonlinearity.The experimental results show that peak load and peak displacement of the RC2 specimen with RC1 specimen were similar,positive(push)load by 6.41%difference,displacement by 1.59%;Within 0.97%difference of negative(pull)load,displacement by 5.88%difference.Compared with RC1 specimen,PC1 specimen had a lower peak load,reduced by 4.66%,the negative to reduce by 5.21%;Peak load of PC2 specimen is a bit high,is increased by 4.33%,negative increased by 1.22%.The peak displacement of PC1 specimen and peak displacement of the RC1 specimen are essentially the same,within 0.90%difference,negative within 1.31%difference.Compared with RC1 specimen,peak displacement of the PC2 specimen was increased by 42.14%,negative increased by 35.41%.Through the contrast test and finite element analysis,we get the following main conclusions:?In frame-shear wall structure,the scheme is feasible,replacing double row steel of vertical distribution with single row steel of large diameter and large spacing in the frame-shear wall,and the basicly equivalent to the original mechanical structure.?Column-wall cast-in-situ belt and using the straight rib lap connection mode,equivalent to the cast-in-place structure.? Column-wall grouting seam is feasible,its performance is close to cast-in-place structure,and it is advantageous to the assembly construction,has a good practicability.The innovation of this study is that it puts forward for the first time?vertical equivalent reinforcement of the shear wall?cast-in-situ belt straight rib lap?new type of column-wall connection mode with keyway and seam grouting connection is suitable for reinforced concrete frame-shear structure,and the experimental study on the overall structure is conducted.Related to this topic,questions are yet to be researched in the future,such as:under the condition of different shear span ratio and axial compression ratio,prefabricated box-shear structure experimental study,based on the model of shear slip of the connection,finite element analysis method of precast frame-shear wall structure,etc.