METHOD OF EXPERIMENTAL DETERMINATION OF DYNAMIC FINAL LOADING IN REINFORCED CONCRETE FRAME-ROD SYSTEMS FROM SUDDEN SHUTDOWN OF LINEAR CONNECTION

摘要

FIELD: testing technology.;SUBSTANCE: invention relates to testing technology, in particular to testing planar and spatial reinforced concrete frame-rod structural systems. The method is implemented as follows. The constructive diagram in the form of a frame-rod system is mounted on a test stand, the support racks are fixed to the power floor, at that one of the racks is made telescopic of two metal pipes connected by the concrete dowel with preliminary calibrated shearing load. Then the source of the light beam is defined with the screen-receiver in one plane and a system of mirrors to structural elements in the relevant sections where it is necessary to make measurements of displacement increment. Then loading of the frame-rod system of the specified design static load is carried out through the load devices, thereby creating a sudden fragile breakdown of the concrete dowel of the telescopic rack and as a result, the shutdown of linear connection. Then according to counts of the beam reflected on the screen with the scale the measurements of displacement increment are carried out from the dynamic final loading of the system in the elements undistorted after exposure beyond design basis.;EFFECT: increase of the accuracy of determining the displacement increment in exorbitant conditions caused by sudden exposure beyond design basis.;2 dwg