The Experimental Study On Shear Capacity For High-strength Concrete Columns With High-strength Stirrup

For a long time, reinforcing bars and intensity grades of concrete that is generally used in the construction work of our country, it compares with developed country to be generally low 1 grade, main reason its whether in conformity with high-strength material structural design theory development lag behind seriously. Can improve receiving strength performance of structure to replace the ordinary intensity Stirrups with the high-strength Stirrups, improve the antidetonation security of the structure, can save steel products consumption, make the good economic benefits, while can make the good environmental protection benefit. So, launch high-strength Stirrups restrain high-strength concrete short column from strength performance and design theoretical research to popularize high-strength application of reinforcing bar, it has important meanings with the development of building science and technology that energy-conservation reduces and arranges.The high-strength concrete at home and abroad of this text is studied on the foundation of the current situation, has proposed adopting the high-strength reinforcing bar as the Stirrup of the high-strength concrete, in order to improve high-strength concrete strength performance and shear into ability. Regard high-strength concrete short column of high-strength Stirrup as the research object, design and make 14 high-strength Stirrups restrain the high-strength concrete short column from trying one, adopt Japan to build grinding type and load the device, loads and tests repeatedly in week through being low, study destruction course to test component, destroy the mode strength mechanism, key analysis component stagnat to go back performance, shear capacity of strength and high-strength hoop stress competence of muscle. On the basis that the high-strength concrete component is shear mechanism analyzed, the existing armored concrete component of survey is shear the strength of bearing the weight of analyze the model, according to the theory of the pressure field of revision, consider the high-strength Stirrup restrains this literary composition model of the high-strength concrete, have proposed the short column based on field theory of the revision pressure is shear the strength of bearing the weight of calculate the formula, compared with test result, indicate calculation formulae put forward are partial to the security. Based on test result of this text, study the concrete intensity, it shear it step until, axle pigeonhole than, Stirrup intensity, and Stirrup form,etc. restrain concrete columns shorts high-strength from shearting into influence to bear the weight of strength to Stirrups high-strength rate of hoop mixed, indicate, shear, step than and to influence high-strength Stirrup restrain high-strength concrete short column from shear into performance main two factor in grade in intensity in concrete. Utilize the high-strength Stirrup to restrain the test data of the high-strength concrete short column, the computing technology while combining currently and normally, the short column is shear the strength of bearing the weight of calculate formulae practically to adopt the statistical method of mathematics and physics and fit, identical better with the test result. Finally, formulae and structural design specification of concrete of our country that the high-strength Stirrup putting forward this text restrains high-strength concrete short column from being calculated, computing technologies such as U.S.A.'s norm, Japan's norm,etc. have been compared, the computing technology that the structural design specification of concrete of our country provides is partial to unsafely. The research results of the thesis can be for project reality's reference.