METHOD DETERMINING POSITION OF NEUTRAL LINE IN SECTION UNDER SIMPLE UNSYMMETRICAL BENDING OF BEAM STRUCTURES Russian patent published in 1998 - IPC

FIELD: construction industry, examination of buildings and structures, tests of construction and machine-making structures, conducting of laboratory practicums in strength of materials. SUBSTANCE: beam anchored on supports is loaded and angle of inclination of plane of acting bending moment to vertical axis of section is determined. In addition flexural vibrations are excited in turn on resonance frequency in beam in two mutually perpendicular planes along direction of major central axes of inertia and these vibrations are measured. Angle of inclination to horizontal axis in section of beam is found by formula β = arctgβ = -arctg[tgα•(f_y/f_z)²],, where α is angle of inclination of plane of action of bending moment to vertical ( major central ) axis of inertia; f_y, f_z are correspondingly resonance frequencies of vibrations of beam in direction of action of major central axes of inertia of section. EFFECT: expanded technological capabilities of method, reduced labor input. 2 dwg