Abstract

An alternative mix design using polypropylene fiber-reinforced high early strength concrete was proposed by the Idaho Transportation Department for the longitudinal connections between deck bulb-T precast bridge girders in accelerated bridge construction. In this paper, finite element models of the pullout behavior of headed reinforcing bars in the closure pour and bending tests of beams representing a 30 cm strip of the bridge deck were developed. The smeared crack model was used for concrete, while cohesive zone modeling showed good results in representing the interface between the closure pour and precast concrete. Steel–concrete bond-slip behavior was observed to be one of the most significant factors affecting the results. A scheme to simulate this behavior using zero-length nonlinear spring elements was designed. The finite element models were able to produce results similar to the experimental findings.

摘要

爱达荷州交通部提出了一种使用聚丙烯纤维增强高早强混凝土的替代混合设计，用于加速桥梁施工中桥面球-T 预制桥梁之间的纵向连接。在本文中，开发了代表 30 cm 桥面带的梁的闭合浇筑和弯曲试验中带头钢筋的拉拔行为的有限元模型。涂抹裂缝模型用于混凝土，而粘性区域模型在表示封闭浇筑和预制混凝土之间的界面方面表现出良好的效果。观察到钢-混凝土粘结滑移行为是影响结果的最重要因素之一。设计了一种使用零长度非线性弹簧元件来模拟这种行为的方案。