Experimental Study On Antiseismic Performance Of Steel Reinforced Super-high-strength Concrete Short Columns Filled With Fibers

The design of columns that support the structure is the key to prevent collapse in the earthquake. With the development of high-rise buildings, reinforced super-high-strength concrete and steel reinforced super-high-strength concrete will being widely used. The more higher concrete strength is, the worse brittleness is;under earthquake, brittle failure will happen to reinforced high-strength concrete, especially short columns whose ductility is very bad and can't resist the earthquake acting force effectively depending on the bigger transfiguration dissipation. Moreover steel fiber and PVA fiber have excellent bending toughness, shear strength and endergonic ability. If they can be united, the preponderance of bearing capacity and antiseismic performance can bring into play fully. So the research is carried out for aseismatic mechanical performance of reinforced super-high-strength concrete and steel reinforced super-high-strength concrete short columns filled with fibers through the test of 21 frame columns.The design of steel reinforced super-high-strength concrete short columns filled with fibers is made in this paper. The main research focuses on the impacts of fiber volume content, stirrup ratio etc. on the aseismatic performance and shear strength of short columns. Also, analyze the partial mechanical performance that can provide basis and direction for the latter experimentation.The experimental study of fiber reinforced super-high-strength concrete short columns and steel reinforced super-high-strength concrete short columns filled with fibers are carried out for antiseismic mechanical performance. The abilities of failure mode, deformation and dissipation energy that short columns can make are discussed. Also, the main factors which affect the ductility of short columns are analyzed. On account of fibers mixed, the cementing bond of aggregate is raised obviously, the binding power and gripping force of longitudinal bar and stirrup are increased, expansion of crack is stayed, the strain of stirrup and longitudinal bar is decreased by a long way, and compressive strength and shear strength in the compression zone are improved. Also, these phenomena are more and more obvious with the adding of fiber volume content. The ductility of short columns is improved obviously and the failure mode of columns is transformed.The test research of fiber reinforced high-strength concrete short columns is carried out for shear strength. Fiber volume content and category which affect the shear strength ofcolumns are analyzed. Taking into account fibers, the shear strength formula of fiber reinforced super-high-strength concrete short columns is put forward through the test, and the calculated results defer to the experimental results. It may be references for practicable engineering design.The research of steel reinforced super-high-strength concrete short columns filled with fibers is carried out for shear bearing capacity. Fiber volume content and category which affect the shear strength of columns are also analyzed. And the shear strength formula of short columns is put forward, which based on the superposed strength method. The calculated results are corresponding with that of test results very well.