Research on behaviors of frame-shear wall structures based on stiffness degradation;

In this paper,a new rate-dependent concrete elasto-plastic damage model for simulating the mechanical behaviors of concrete is established by introducing the effect of strain rate,damage variable and stiffness degradation variables.

The real stiffness of frame in different deformation phases was determined according to experimental data,and the stiffness degradation coefficient was adopted to revise the stiffness of each floor.

The hysteretic behavior, rigidity degeneration, ductibility and capability of energy dissipation are analyzed by loading the structures in two principal directions.

Based on the experiments under low reversed cyclic loading,failure pattern,hysteresis curves,skeleton curves,restoring force model,displacement restoring capacity,ductility and rigidity degeneration of prestressed concrete beams with high PPR are studied systematically.

Based on the experiment of columns under low-frequency cyclic loads, this paper discovers that rigidity degeneration is not obvious during the early loading stage but increases after the crack appears.

Based on the nonlinear theory,the accumulation effects of grade stiffness degeneration are considered in structural deterioration.

In order to master the mechanical behaviors of vertical connection and correct design in prefabricated reinforced concrete (PRC) structures the strength degeneration and stiffness degeneration of the connection under repeated loading are analysed based on test results and theoretical analysis.

To the question of the medium truck frame which easily leads to endurance failure and breaking,made an analysis on the rigidity and intensity of the frame.