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Cost-effective analysis technique for the design of bridges against strike-slip faulting

机译：防撞故障桥梁设计的经济高效分析技术

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The paper studies the performance of a typical overpass bridge, with continuous deck and monolithic pier-deck connections, subjected to strike-slip faulting. A three-dimensional (3D) finite element (FE) model of the entire bridge-foundation-abutment-soil system is developed, accounting for soil, structure and geometric nonlinearities. Soil behaviour is simulated with a thoroughly validated strain softening constitutive model. The concrete damaged plasticity (CDP) model is implemented for piers, accounting for the interaction between axial force N, bending moment M, shear force Q and torsion T (NMQT); the model is validated against experimental results from the literature. The location of the fault rupture is parametrically investigated, confirming the vulnerability of indeterminate structural systems to large tectonic deformation. The deck is shown to sustain both in-plane and out-of-plane bending moments, as well as torsion; the piers are subjected to biaxial bending, shear and torsion. The response is highly dependent on the location of the fault rupture, emphasizing the need to develop cost-effective modelling techniques. Four such techniques are developed (with and without decoupling) and comparatively assessed using the detailed 3D FE model as benchmark. The best prediction is achieved by a coupled model, which includes the bridge superstructure, detailed 3D modelling of the soil-foundation system only for the pier directly affected by the fault, and nonlinear springs representing the foundations of all other piers. The proposed technique offers a computationally efficient means to parametrically analyse long multispan bridges subjected to faulting, for which full 3D FE modelling is impractical.
机译：本文研究了典型的立交桥的性能，具有连续甲板和整体墩甲板连接，经受防撞断层。开发了整个桥梁基础 - 邻接土壤系统的三维（3D）有限元（FE）模型，占土壤，结构和几何非线性。用彻底验证的菌株软化本构模型模拟土壤行为。混凝土损坏可塑性（CDP）模型用于墩，占轴向力N，弯矩M，剪切力Q和扭转T（NMQT）之间的相互作用;该模型针对文献的实验结果验证。故障破裂的位置是参数研究的，确认不确定结构系统的脆弱性达到大构造变形。甲板显示在平面内和面外弯曲的时刻，以及扭转;码头受双轴弯曲，剪切和扭转。响应高度依赖于故障破裂的位置，强调需要开发成本效益的建模技术。开发了四种这样的技术（随着和不去耦）并使用详细的3D FE模型进行比较评估为基准。通过耦合模型实现了最佳预测，该耦合模型包括桥接器上部结构，仅针对受故障直接影响的码头的土壤基础系统的详细3D建模，以及代表所有其他码头的基础的非线性弹簧。该提出的技术提供了计算有效的方法，可以参数分析经过故障的长多板桥，完整的3D FE模型是不切实际的。

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