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Elasto-plastic seismic response of RC continuous bridge with foundation-pier dynamic interaction

机译：具有基础-桩端动力相互作用的钢筋混凝土连续桥的弹塑性地震响应

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摘要

In civil engineering projects, shallow foundation is often employed as a base for bridges, wind-turbines, oil tanks and so on. But shallow foundation experiences obvious uplift and plastic deformation under intensive earthquake action. Existing solution to the problem relies on the study of soil-structure interaction (SSI) aiming at the nonlinear performance of soil foundation rather than at a coupled bridgefoundation system. To save the situation, this paper presents a two-degree of freedom (2DOF) model, considering nonlinearities of both RC pier and soil foundation, to evaluate seismic responses of a bridge-foundation system. The 2DOF model provides equations of motion to calculate constant damping effect and the time-varying damping effect, respectively. In addition, the revised Winkler foundation model, considering nonlinear bending moment versus rotation, is used to study plasticity and uplift effects of soil foundation, the modified Takeda hysteretic model is employed to simulate the nonlinear performance of RC bridge piers, and the numerical simulation of a typical RC continuous bridge with shallow foundation in four ground motions and incremental seismic intensities is conducted to assess the seismic performance of the bridge-foundation system. According to the results from these studies, the 2DOF model, truly reflecting the nonlinear properties of both RC pier and soil foundation, is proved more reasonable than the existing SDOF model for overestimating the seismic response of the bridge-foundation system. Moreover, the ratio of the moment resist stiffnesses of the RC pier and the soil-foundation is a critical factor affecting the seismic behavior and the time-varying damping, favorable in dissipating earthquake energy but unfavorable in limiting the displacement response at top of the pier.
机译：在土木工程项目中，浅层基础通常被用作桥梁，风力涡轮机，油箱等的基础。但是浅层地基在强烈地震作用下会出现明显的隆起和塑性变形。解决该问题的现有方法取决于对土壤-结构相互作用（SSI）的研究，该研究的目标是土壤基础的非线性性能，而不是基于耦合的桥梁基础系统。为了节省这种情况，本文提出了一种考虑钢筋混凝土桥墩和土基非线性的两自由度（2DOF）模型，以评估桥梁基础系统的地震响应。 2DOF模型提供了运动方程，分别计算恒定阻尼效果和随时间变化的阻尼效果。此外，考虑到非线性弯矩与旋转的关系，使用经修正的Winkler基础模型来研究土壤基础的可塑性和隆升效应，并使用经改进的Takeda滞回模型来模拟RC桥墩的非线性性能，并进行数值模拟。进行了典型的具有四个地震动和递增地震烈度的浅基础的RC连续桥，以评估桥基础系统的抗震性能。根据这些研究的结果，证明2DOF模型真实地反映了RC墩和土壤基础的非线性特性，比现有的SDOF模型过高估计了桥梁基础系统的地震响应更为合理。此外，RC墩的抗弯刚度与土基的比值是影响地震行为和时变阻尼的关键因素，有利于耗散地震能量，但不利于限制墩顶部的位移响应。

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    Zheng Y; Chen B; Chen W;

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  • 年度 2015
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  • 正文语种 eng
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