Abstract
Here, to solve problems of sharp increase in the amount of calculation after the number of parameters increasing and unideal optimization effect of single component response as the optimization objective in the process of seismic mitigation and isolation parametric optimization, a seismic mitigation and isolation parametric optimization method was proposed to improve the search efficiency of the optimal solution by means of the response surface method taking the post-earthquake maintenance cost of bridge structure under E2 horizontal fortification earthquake as the optimization objective. Firstly, the calculation method of direct economic loss of bridge structure after earthquake based on components and the response surface method combined with the central composite design were introduced. Then, taking a skew continuous beam bridge with cable modulus expansion joint and plate rubber bearing as an example, a nonlinear finite element model based on OPENSEES numerical platform was constructed, and the original site seismic time histories matching the code's response spectrum were selected as the input to optimize stiffness of plate rubber bearing, free path of cable modulus expansion joint and cable stiffness, and verify the correctness and reliability of the proposed method. Finally, skew bridge models adopting cable modulus expansion joint and ordinary modulus expansion joint, respectively under different skew angles were established, and seismic mitigation effects of cable modulus expansion joint under different skew angles were analyzed contrastively. The results showed that the proposed optimization method of seismic mitigation and isolation parameters of skew bridge has better calculation efficiency and accuracy; the post-earthquake maintenance cost of skew bridge is most affected by bearing stiffness, effects of cable free path are the second, and effects of cable stiffness are the minimum; setting cable modulus expansion joint can balance bearing damage and abutment damage, and significantly reduce the bridge's post-earthquake maintenance cost; the post-earthquake maintenance cost of skew bridge with ordinary modulus expansion joint increases with increase in skew angle, while that of skew bridge with cable modulus expansion joint is less affected by skew angle.
Translated title of the contribution | Optimization of seismic mitigation and isolation parameters of skew bridge with cable modulus expansion joint |
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Original language | Chinese (Simplified) |
Pages (from-to) | 120-127 and 166 |
Journal | Zhendong yu Chongji/Journal of Vibration and Shock |
Volume | 41 |
Issue number | 9 |
DOIs | |
Publication status | Published - 15 May 2022 |
Externally published | Yes |
Keywords
- Bridge engineering
- Parametric optimization
- Response surface method
- Seismic loss
- Seismic mitigation and isolation
- Skew bridge
ASJC Scopus subject areas
- Acoustics and Ultrasonics
- Mechanics of Materials
- Mechanical Engineering