Concrete axial strain measuring device

The utility model relates to the technical field of stress strain measurement, in particular to a concrete axial strain measurement device. Comprising a plurality of frame structures arranged on the periphery of the concrete member in a sleeving mode, and the frame structures are fixed to the side face of the concrete member through clamping devices; the displacement sensor is connected with the frame structures in the axial direction of the concrete member, one end of the displacement sensor is in abutting connection with the lowest frame structure, and the other end of the displacement sensor is fixedly connected with the other frame structures, so that the influence of the stability of the loading device on the accuracy of measured data is avoided; the clamping device comprises a clamping plate abutting against the side face of the concrete member and a top plate connected with the clamping plate through a spring, the clamping device is connected with the frame structure in a penetrating mode through a hor