Experimental Study On Prestressed Steel Reinforced High-strength Wrapped By Reactive Power Concrete Beams

Since the invention of Reactive Power Concrete(PRC for short),it attracted the attention of civil engineers and comes from the perfect mechanics performance of PRC.Compared with traditional concrete,the maximum compressive strength of PRC is 800MPa which is dozen times than the traditional.In the meantime,the RPC has many excellent mechanical properties,such as high tension strength,resistance permeating of Cl-,earthquake-resistant.We can believe PRC will have a good future.Due to the particularity of RPC compared with the ordinary,so far there is still no specialized research on the PRC and related correlation and procedures at home and abroad.The researchers just did their work about RPC material and steal reactive powder concrete.So,this paper will study for the Outer-plated RPC steel beam.Firstly,this paper demonstrated the suitability of selection of mechanical performance index of RPC and their standards in literature and also recommended formulas applied by results of mechanical testing for RPC like test of axial compressive strength,the cube compressive strength test,cleavage tensile strength experiments and elastic modulus test.The research results provide a theoretical basis and valuable benchmark for choosing the mechanical indexes when calculating RPC components.Secondly,based on the bending experiment of 3 Outer-plated RPC steel beam,specimens of simply supported beams the failure process,crack development mode,deflection deformation characteristics and failure mode are observed,and the loading capacity of Outer-plated RPC steel beam,the typical load-deflection curves of Outer-plated RPC steel beam as well as strain valve of across mid-span section of concrete and concrete and steel along the section height are obtained,then loading capacity characteristic,phased characteristic of load-deflection curve development and distribution,of across mid-span beams of concrete and steel strain are analyzed.The seasons causing general bending failure modes when the specimens were destroyed are presented.The Formation and Developing Mechanism of the cracks are revealed.The formula of calculating crack load and normal section compression strength of Outer-plated RPC steel beam is inferred.The research achievements will provide experimental data and a theoretical support for theoretical calculation of cross-section flexural properties of Outer-plated RPC steel beam,and also will provide the foundation of further meticulous research on Outer-plated RPC steel beam.Finally,according to the principle and rules of equivalent stress,the RPC graphics parameters of equivalent rectangular stress diagram was calculated.And through the comparison,the fact that the ? which is the ratio of the height of the rectangular pressure stress diagram and the height of the neutral axis according to the plane cross-section assumption is between 0.7 to 0.8 and the a which is rectangular pressure stress and the maximum stress in compression is distributed between 0.9 and 1.0 was found.According to the mechanical characteristics and failure modes of test beam components,the formula used to calculate the cracking load and the ultimate bearing capacity of normal section of the beam of the Outer-plated RPC steel beam have been derived perfectly.And on the basis of the formula,the theoretical value of cracking load and ultimate bearing capacity of beams was calculated specifically.The calculation results show that the test values are in good agreement with those obtained with the theoretical value.