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The effect of local topography on the seismic response of a coupled train-bridge system
Hong Qiao,Xianting Du,He Xia,Guido De Roeck,Geert Lombaert,Peiheng Long 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.69 No.2
The local topography has a significant effect on the characteristics of seismic ground motion. This paper investigates the influence of topographic effects on the seismic response of a train-bridge system. A 3-D finite element model with local absorbing boundary conditions is established for the local site. The time histories of seismic ground motion are converted into equivalent loads on the artificial boundary, to obtain the seismic input at the bridge supports. The analysis of the train-bridge system subjected to multi-support seismic excitations is performed, by applying the displacement time histories of the seismic ground motion to the bridge supports. In a case study considering a bridge with a span of 466 m crossing a valley, the seismic response of the train-bridge system is analyzed. The results show that the local topography and the incident angle of seismic waves have a significant effect on the seismic response of the train-bridge system. Leaving these effects out of consideration may lead to unsafe analysis results.
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Biogeography-Based Optimization of RC structures including static soil-structure interaction
Iván A. Negrin,Dirk Roose,Ernesto L. Chagoyén,Geert Lombaert 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.80 No.3
A method to minimize the economic cost of the structural design of spatial reinforced concrete (RC) frame structures is presented. SAP2000 is used as computational engine, taking into account modelling aspects such as static soilstructure interaction (SSSI). The optimization problem is formulated to properly reflect an actual design problem, limiting e.g., the size of reinforcement bars to commercially available sections. The resulting discrete optimization problem is solved by using Biogeography-Based Optimization (BBO), an evolutionary algorithm selected for its convergence properties. Strategies to reduce the computational cost of the optimization procedure are proposed and an extensive tuning of the parameters of the BBO algorithm is performed, using a novel utility metric, evaluated for models of six simple RC frame structures. The parameters to deal with more complex structures are selected based on the use of utility landscapes. The resulting tuned optimization algorithm allows to reduce the direct cost of the construction of a particular structure project with 21% (15% when SSSI is not taken into account), compared to a design based on traditional criteria. The effect of considering SSSI on the cost of the superstructure is also evaluated, showing that this is an aspect that should not be neglected during modeling.
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