Dataset: RC U-shaped walls subjected to in-plane, diagonal, and torsional loading: new experimental findings

This dataset contains the processed experimental digital image correlation (DIC) technique data for two large-scale reinforced concrete U-shaped wall specimens tested at the Earthquake Engineering and Structural Dynamics Laboratory (EESD Lab), École Polytechnique Féderale de Lausanne (EPFL) in Switzerland. The abstract for the corresponding journal paper, submitted to Engineering Structures, is given below. Although reinforced concrete U-shaped walls are popular in construction practice internationally, there is a paucity of experimental research investigating the seismic performance of such salient elements. The present paper summarizes an experimental campaign on two slender U-shaped reinforced concrete walls detailed with a single-layer of reinforcement. State-of-the-art instrumentation was used to capture the three-dimensional displacement field of the wall surfaces using digital image correlation techniques. Experimental findings are presented, including strain profiles, equivalent plastic hinge lengths, longitudinal strains at the base, cracking distributions and widths, and out-of-plane deformations. The longitudinal strain profiles showed a yielding region up the boundary ends of the flanges of approximately 800 mm to 1200 mm in length, depending on the direction of loading and at large drift levels. Approximately half of the yielding zone length was found to be equal to the equivalent plastic hinge lengths, which were found to decrease as a function of drift. The longitudinal strains at the base of these walls showed some shear lag effects when subjected to in-plane or diagonal loading. For most directions of loading, the largest crack widths were found to be associated with flexural-shear or shear cracks. When subjected to a pure torque, the vertical strain distribution at the base of the wall correlated with the theoretical distribution for an open section governed by warping torsion. The out-of-plane deformations were primarily concentrated within a small region towards the ends of the flanges prior to the local buckling failures that were observed experimentally.Although reinforced concrete U-shaped walls are popular in construction practice internationally, there is a paucity of experimental research investigating the seismic performance of such salient elements. The present paper summarizes an experimental campaign on two slender U-shaped reinforced concrete walls detailed with a single-layer of reinforcement. State-of-the-art instrumentation was used to capture the three-dimensional displacement field of the wall surfaces using digital image correlation techniques. Experimental findings are presented, including strain profiles, equivalent plastic hinge lengths, longitudinal strains at the base, cracking distributions and widths, and out-of-plane deformations. The longitudinal strain profiles showed a yielding region up the boundary ends of the flanges of approximately 800 mm to 1200 mm in length, depending on the direction of loading and at large drift levels. Approximately half of the yielding zone length was found to be equal to the equivalent plastic hinge lengths, which were found to decrease as a function of drift. The longitudinal strains at the base of these walls showed some shear lag effects when subjected to in-plane or diagonal loading. For most directions of loading, the largest crack widths were found to be associated with flexural-shear or shear cracks. When subjected to a pure torque, the vertical strain distribution at the base of the wall correlated with the theoretical distribution for an open section governed by warping torsion. The out-of-plane deformations were primarily concentrated within a small region towards the ends of the flanges prior to the local buckling failures that were observed experimentally.

本数据集包含经预处理的试验数字图像相关（Digital Image Correlation, DIC）技术数据，对应两组大型钢筋混凝土U形墙试件的试验数据，试验于瑞士洛桑联邦理工学院（École Polytechnique Fédérale de Lausanne, EPFL）地震工程与结构动力学实验室（Earthquake Engineering and Structural Dynamics Laboratory, EESD Lab）完成。下文给出了投稿至《工程结构》（Engineering Structures）期刊的对应研究论文的摘要。尽管钢筋混凝土U形墙在全球建筑工程实践中应用广泛，但针对这类关键构件抗震性能的试验研究仍较为匮乏。本文总结了针对两组采用单层配筋设计的细长钢筋混凝土U形墙开展的试验研究。研究采用当前最先进的测试仪器，通过数字图像相关技术采集墙身表面的三维位移场。本文呈现了试验所得的多项结果，包括应变分布曲线、等效塑性铰长度、墙底纵向应变、裂缝分布与宽度以及平面外变形。试验结果显示，在大侧移工况下，根据加载方向的不同，翼缘边界端部的屈服区域长度约为800 mm至1200 mm。研究发现，屈服区域长度约有一半与等效塑性铰长度一致，且等效塑性铰长度随侧移增大而减小。当承受面内或斜向加载时，墙底纵向应变表现出一定的剪力滞效应。在多数加载方向下，最大裂缝宽度多与弯剪裂缝或剪切裂缝相关。当承受纯扭矩作用时，墙底的竖向应变分布与开口截面翘曲扭转的理论分布相符。试验观察到局部屈曲破坏发生前，平面外变形主要集中于翼缘端部的小范围区域内。尽管钢筋混凝土U形墙在全球建筑工程实践中应用广泛，但针对这类关键构件抗震性能的试验研究仍较为匮乏。本文总结了针对两组采用单层配筋设计的细长钢筋混凝土U形墙开展的试验研究。研究采用当前最先进的测试仪器，通过数字图像相关技术采集墙身表面的三维位移场。本文呈现了试验所得的多项结果，包括应变分布曲线、等效塑性铰长度、墙底纵向应变、裂缝分布与宽度以及平面外变形。试验结果显示，在大侧移工况下，根据加载方向的不同，翼缘边界端部的屈服区域长度约为800 mm至1200 mm。研究发现，屈服区域长度约有一半与等效塑性铰长度一致，且等效塑性铰长度随侧移增大而减小。当承受面内或斜向加载时，墙底纵向应变表现出一定的剪力滞效应。在多数加载方向下，最大裂缝宽度多与弯剪裂缝或剪切裂缝相关。当承受纯扭矩作用时，墙底的竖向应变分布与开口截面翘曲扭转的理论分布相符。试验观察到局部屈曲破坏发生前，平面外变形主要集中于翼缘端部的小范围区域内。