Calculating the collapse probability of large and complex bridges during ship collisions by using reliability theory is an inevitable trend in the development of risk assessment for ship-bridge collisions. On the basis of reliability theory and by combi ning VC + + with ANSYS general finite element software, we develop a program for computing the reliability of bridges during ship collisions by the ANSYS and response surface method. The collapse probability and reliability sensitivity index of the Jialing River Huanghuayuan Bridge during ship collisions are calculated by the program. Results show the following: ( 1) the pier col lapse probability with ship collisions is greater when the water level of the bridge area is at the normal level of 174 m; (2) the density, ship-collision velocity, ship-collision angle, and concrete compressive strength are the main factors that affect bridge collapse probability during ship collisions.
The superstructure rotation method (SRM) has been widely used in recent years due to its rapid construction, low cost and less impact on existing traffic.This paper focuses on construction method and the key parameters related with large angle synchronous rotation construction of T-shape curved rigid frame bridges, taking two bridges of the Wuyi Expressway over the Chengdu-Kunming Railway as the engineering background.The results show that the construction methods used in this project can accomplish the realization of complexed synchronous rotation execution of T-shape curve rigid frame bridge. The construction methods consist of the installation process of ball joint, the design of traction system, accuracy control method and rotation control strategy.The friction coefficients from practical measurements were compared with the analytical ones from existing formulas, and it shows that the calculation method can give good predictions for the friction coefficients at the SRM of curve rigid frame bridge.Finally, the key technologies and determination of key parameters applicable for large angle synchronous rotation construction of curve T-shape rigid frame bridge are summarized. Furthermore, the research results in this paper can provide technical recommendation for the construction of the similar bridges.
To study the influence of the lateral deformations of a simply-supported beam bridge on the safety of high-speed railway train operations under earthquake action, this study adopted a three-span simply-supported beam bridge with 32-m spans as an example. Finite element software ANSYS and multi-body dynamics software SIMPACK were used to establish a coupled train-bridge dynamic model subjected to seismic excitations. By adopting different ground motions and changing the peak ground acceleration (PGA) and the train speed, the effects of different earthquakes and train speeds on the train driving safety were analyzed. Several conclusions were obtained. First, the trends in train derailment coefficient, wheel load reduction rate, lateral horizontal wheelset forces, vertical accelerations of the car body, lateral accelerations of car body, and other dynamic indices were similar under different ground motions, but the actual values were different. Second, the PGA had a significant impact on the train derailment coefficient, wheel load reduction rate, lateral horizontal wheelset forces, and lateral accelerations of the car body, but little effect on the vertical accelerations of the car body. Third, the train speed affected the train derailment coefficient, wheel load reduction rate, lateral horizontal wheelset forces, vertical accelerations of the car body, and lateral accelerations of the car body, and these dynamic performance indices were positively correlated with the train speed. Fourth, in case of the earthquake with a PGA of 0.3g, a high-speed train would have to travel slower than at 280 km/h to ensure the safety and comfort of the ride.
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