ABSTRACT
The OpenSees is widely used in the field of bridge earthquake resistance. The low efficiency of modelling is one of the bottlenecks restricting its popularization. In order to quickly establish the dynamic model of the OpenSees full bridge, the conversion formula between the β angle of the Midas Civil beam element and the axial vector of the OpenSees beam element is derived based on the basic concept of β angle. Based on Python language, a fast method for establishing the dynamic model of the whole bridge of OpenSees is established, and the corresponding ANSYS model is generated and verified. Taking Dashengguan Yangtze River Bridge in Nanjing as an example, the dynamic responses of structures under three typical seismic waves are compared based on the two generated dynamic models. The results show that the automatically generated OpenSees model is completely consistent with the first 10 natural frequencies of the Midas Civil model, and the maximum error of the first 20 natural frequencies is 4.5%. Further comparing the displacement, velocity and acceleration of the vault nodes, the maximum amplitude error is 9.8%, which comes from the calculation error of the software itself. Using the MTO conversion program, a one-click generation of complex bridge OpenSees dynamic model can be realized. The research results of this paper can be used to quickly establish the dynamic model of the whole bridge of OpenSees.
