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首页> 外文期刊>Bulletin of earthquake engineering >Shear effects on hollow section piers under seismic actions: Experimental and numerical analysis
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Shear effects on hollow section piers under seismic actions: Experimental and numerical analysis

机译：地震作用下空心截面墩的剪力效应：实验与数值分析

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摘要

Shear effects are often a very important issue on the seismic behaviour of piers, particularly for hollow section bridge piers. In fact, for this type of piers the cyclic response is similar to that of a structural wall in which both the transverse reinforcement ratio and the detailing can play an important role on its performance, even likely to be determinant in terms of the failure mechanism. On the other hand, codes and design guidelines are usually very conservative concerning shear capacity in order to avoid any shear failure mechanism likely to trigger well known catastrophic consequences. Therefore, research studies on this topic are still needed for a better understanding of pier cyclic shear response and also for improvement of the performance under seismic actions. Pursuing this general objective, this paper partially reports on an experimentalumerical campaign carried out on 1:4 reduced scale bridge piers in order to highlight and investigate shear-type problems. Within the scope of this paper, two specimens types were selected having equal rectangular hollow section (900 × 450 mm~2, 75 mm thick) but different transverse reinforcement detailing, namely one with a single stirrup per wall (representative of typical bridge construction without seismic design requirements) and another with multiple stirrups, according to Eurocode 8 provisions. Numerical simulations of the experimental results were also conducted aiming at contributing for complete and consistent interpretations of experimental results. Detailed modelling was performed allowing for realistic simulations of the non linear behaviour, particularly suitable when a significant shear component is involved. Therefore, the numerical strategy was based on a detailed 3D FEM discretization using a two-scalar variable damage model for the concrete constitutive law and a suitable cyclic behaviour law for steel bars represented by truss elements. Results have shown that shear deformation and failure modes are well simulated, while providing detailed insight concerning concrete damage pattern and distribution of yielding on the transverse and longitudinal reinforcement.
机译：剪力效应通常是桥墩抗震性能的一个非常重要的问题，特别是对于空心截面桥墩而言。实际上，对于这种类型的墩，其循环响应与结构墙的循环响应相似，在结构墙中，横向配筋率和细部均可对其性能起重要作用，甚至可能取决于破坏机理。另一方面，关于剪切能力的规范和设计指南通常非常保守，以避免任何可能引起众所周知的灾难性后果的剪切破坏机制。因此，仍然需要对该主题进行研究，以更好地理解墩的周期性剪力响应以及改善地震作用下的性能。为了实现这一总体目标，本文部分报告了在比例为1：4的缩小桥墩上进行的实验/数值研究，以突出并研究剪切型问题。在本文范围内，选择了两种试样类型，这些试样具有相同的矩形空心截面（900×450 mm〜2，厚度75 mm），但横向钢筋的细部不同，即每根墙仅具有一个箍筋（代表典型的桥梁结构而没有抗震设计要求），并根据欧洲规范8的规定使用多个箍筋。还进行了实验结果的数值模拟，旨在为实验结果的完整和一致的解释做出贡献。进行了详细的建模，从而可以对非线性行为进行逼真的模拟，特别适用于涉及大量剪切分量的情况。因此，该数值策略是基于详细的3D FEM离散化，该离散化使用针对混凝土的本构律采用两标量可变损伤模型，并针对由桁架元素表示的钢筋采用合适的循环行为律。结果表明，可以很好地模拟剪切变形和破坏模式，同时提供有关混凝土破坏模式和横向和纵向钢筋屈服分布的详细见解。

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