The present application relates to the technical fields of intelligent sensing of bridges, and particularly relates to an energy collection device arranged at a bridge
expansion joint, a design method and a bridge
expansion joint monitoring mechanism, comprising: a conversion unit arranged in a bridge
expansion joint structure, capturing the strain of the structure after being stressed, and generating an alternating flexoelectric
signal; a base layer located between the conversion unit and the bridge expansion joint, adjusting the
strain distribution of the conversion unit; a rectification unit integrated with an
impedance matching circuit, connected with the conversion unit, converting the alternating flexoelectric
signal into a
direct current, and delivering it to an
energy storage unit; compared with the prior art, the beneficial effects of the present application are: the present application relates to a monitoring mechanism of a bridge expansion joint, the device has a self-powered
structure based on the flexoelectric effect, without external power supply, significantly reducing the wiring and maintenance cost, at the same time, the monitoring unit realizes
millimeter level displacement resolution and real-
time structure health assessment, ensuring the
structural safety of the bridge expansion joint.