Analysis of the influence of column reinforcement anchorage length in a concrete two-pile cap

Abstract This paper describes the parametric analysis applied to assess the influence of column anchorage-reinforcement length on concrete two-pile caps under uniform compression. The non-linear numerical analysis was conducted with the bi-dimensional elements of ATENA 2D software, considering perfect adherence between steel and concrete. Simulation was based on the experimental reference model by Munhoz [1], which was the parameter adopted to validate the numerical modeling. From the validated model, four different anchorage reinforcement lengths were adopted, 34,0 cm, 20,0 cm, 10,0 cm e 3,0 cm, in order to compare pile caps behavior after these changes. Pile cap simulations presented similar behavior, i.e., column anchorage reinforcement length is not a preponderant factor for the internal mechanisms that regulate the function of these elements.摘要 本文开展参数化分析，以评估均匀受压状态下柱锚固筋长度对混凝土双桩承台的影响。本次非线性数值分析采用ATENA 2D软件的二维单元完成，并考虑了钢与混凝土之间的完美黏结工况。本次模拟以Munhoz[1]提出的试验参考模型为基准，以该模型对数值建模进行验证。基于验证后的数值模型，本次研究选取34.0cm、20.0cm、10.0cm及3.0cm四种不同的锚固筋长度，以对比参数调整后双桩承台的受力响应变化。模拟结果显示，所有双桩承台均呈现相似的受力响应，即柱锚固筋长度并非调控此类构件受力内在机制的主导影响因素。