Because of the complicated behavior of material and loads,the precise simulation of PC structures or members under cyclic loads has to depend on numerical model.

After analyzing lots of the calculating results,a working mechanism of the member subjected to cycle loading is illuminated.

On the basis of a lot of test pile data,the article analyzes the pile-soil response mechanism and discusses the influence factors of single pile under the lateral reciprocating loading.

Under reciprocating loading , the interaction relation of pile and earth are influenced by circulating frequency, the way of load addition, stress route and other.

Based on the experiment of several brick walls with a door strengthened by carbon fiber sheet under cyclic loading,the seismic capability of these strengthened walls were analyzed,by which the mechanics-calculating model of the strengthened wall was established.

Based on the experiment of several brick walls with a door strengthened by carbon fiber sheet under cyclic loading, the strengthened effect on the seismic capacity of the walls was studied through the comparison of the data of the wall before strengthened and the strengthened one.

In order to obtain a constitutive relation of saturated soil with laterally constrained compression under cyclic loading, a series of experiments have been carried out so as to describe the nonlinear and hysteresis characteristics property.