Research on Seismic Behavior and Restoring Force Model of Scrap Tire-Sand Composite Foundation

In order to study the seismic performance of the scrap tire-sand composite foundation, six groups of quasi-static tests of the tire-sand composite foundation are carried out. The effects of the stacking mode of the tire-sand unit, the initial vertical load and the carbon fiber mesh on the hysteretic performance of the composite foundation are analyzed. Based on the pseudo static test, the restoring force model of the scrap tire-sand composite foundation is established by using the test fitting method. The results show that the hysteretic curve of the scrap tire-sand composite foundation is full, the overall shape is shuttle, thus it has good energy dissipation capacity. The staggered stacking of tire-sand unit, increasing the initial vertical load and adding carbon fiber mesh are conducive to the tire-sand composite foundation to participate in energy consumption. The calculated results of hysteretic curve of the restoring force model are in good agreement with the test results, which can reflect the stress process and main stress characteristics of the specimen.