PROCEDURE TESTING STIFFNESS, CRACK RESISTANCE AND STRENGTH OF BENT REINFORCED CONCRETE STRUCTURES Russian patent published in 2002 - IPC

FIELD: construction industry. SUBSTANCE: procedure is meant to test parameters of quality of beam reinforced concrete structures used in construction industry. Procedure testing stiffness, crack resistance and strength of bent reinforced concrete structures of the type of beams and plates consists in installation of structure in test rig, in its anchoring in agreement with requirements of test specifications and service conditions, in excitation of vibrations of resonance frequency f_c in structure, in their measurement and determination of parameters of quality by comparison of resonance frequency of vibrations in tested and standard structures. With this in mind standard structure is loaded by three stages of uniformly distributed load corresponding to three proof loads to determine stiffness [P_w], crack resistance [P_cr] and strength [P_str], resonance frequencies f_o of vibrations of standard structure are measured without load are measured and at each stage of loading f_w,f_cr,f_str and approximation dependence f_st-P_st is constructed by obtained results P_c≤[P_w]. Tested structure is loaded once with uniformly distributed load with intensity and fitness of this structure for service is found by comparison of resonance frequencies f_c and f_st of vibrations corresponding to specified load. EFFECT: increased precision of evaluation of parameters of quality of beam reinforced concrete structure. 1 cl