Control Standard For Differential Settlement In Bridge-subgrade Transition Section Based On Comfort Property

The existence of differential settlement in bridge-subgrade transition section will reduce the running speed of the road, and also affect its safety and comfort property directly. So it turns to be one of the key technical problems to affect the normal operation of the road. The thesis operates the principle of the differential settlement in bridge-subgrade transition section and proposes a kind of differential settlement control criterion based on comfort property, and eventually we provide a theoretical basis for the timely maintenance and rational design of the bridge-subgrade transition section.The highway of Jing Gang Ao and Zheng Jiao Jin in Zhenzhou,Henan province as the study object,the paper focuses on the investigation of reason and present situation for bumping at bridge-head of highway, and takes maximum settlement value and the maximum change in longitudinal slope value the differential settlement control criterion in bridge-subgrade transition section, and takes transient root mean square of weighted acceleration as evaluation index of comfort property of human body. The theory and method of vibration testing system with piezoelectric acceleration sensor is introduced, interior scaling on accelerometer and fourier transform with data are carried out, the Vibration Acceleration is obtained when the car is passing the bridge-subgrade transition section. Based on above vertical acceleration of human, made objective evaluation of human comfort when when the car is passing the bridge-subgrade transition, the regression obtains the relations of transient root mean square of weighted acceleration and the biggest subsidence quantity and vertical slope value. This thesis proposes control index of differential settlement in bridge-subgrade transition section under the different running speed based on "Some are not comfortable" of physical sensation on human..