Aiming at problem of concrete internal stress matching error of sensor

design embedded type strain brick sensor

which make concrete as a part of the whole sensor to calibrate

so as to reduce influence of matching error in actual measurement. Temperature and interference compensation is considered in design of sensor

and strain gauge is well protected to ensure that the sensor has good insulating property under 20 MPa stress. 50 kN static loading experiment is carried out to get the function relation between loading force and output of sensor

and nonlinear error. Through dynamic loading experiments of shock tube

it is derived that natural frequency of strain brick is greater than 30 kHz

and can be used for measurement of internal stress of concrete with dynamic loading.