K. Zheng’s scientific contributions

Based on a typically simply-supported girder bridge in Wenchuan, a set of finite element model samples of bridges were provided by considering the uncertainty of bridge parameters. Nonlinear dynamic transient analysis was preformed using the Wenchuan earthquake ground motion record,in which seismic peak responses of bridge components were included. The seismic demands of bridge components were analyzed by principal component method for reduction of dimensions, and the composite seismic demand of bridge system was obtained. By using the regression analysis method, a probabilistic relationship between the ground motion intensity and the composite seismic demand was established. On this basis, the different ground motion intensity measures were suggested and compared. The results show that the velocity-based ground motion intensity measures have preferable efficiency, proficiency and sufficiency, and could be used for the seismic vulnerability analysis and seismic risk assessment further.