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首页> 外文期刊>Journal of bridge engineering >Coupled Effects of Concrete Shrinkage, Creep, and Cracking on the Performance of Postconnected Prestressed Steel-Concrete Composite Girders
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Coupled Effects of Concrete Shrinkage, Creep, and Cracking on the Performance of Postconnected Prestressed Steel-Concrete Composite Girders

机译：混凝土收缩，蠕变和裂缝对后连接预应力钢混凝土组合梁性能的耦合影响

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摘要

Prestressed steel-concrete composite girders constructed by postconnection have gained increasing attention in bridge engineering in recent years. By prestressing the concrete slabs before connecting them with the steel girders in the hogging regions subject to negative moments, this new construction method for steel-concrete composite girders is capable of mitigating the risk of concrete cracking in continuous girders to improve the safety and serviceability of bridges. To study the complex stress and strain distributions in the prestressed composite section as well as their nonlinear evolution with time, a three-dimensional (3D) viscoelastoplastic damage constitutive model is presented in this investigation. In this model, the instantaneous responses of concrete are described by an elastoplastic damage model, and the time-dependent concrete creep and shrinkage are approximated based on an improved rate-type formulation. Compared with the one-dimensional (1D) elastic analysis widely used in current practice, the proposed model provides detailed and realistic information of the stress and strain distributions within the entire composite section during construction and in service. In a case study of a real continuous girder, the coupled effects of concrete shrinkage, creep, and cracking on the long-term behavior of the composite section are estimated based on the proposed model. Furthermore, a parametric study on the curing duration shows that this new construction method can be further improved by controlling the concrete shrinkage.
机译：通过后连接构造的预应力钢-混凝土组合梁近年来在桥梁工程中越来越受到关注。通过将混凝土板与承受负弯矩的横梁区域中的钢梁连接之前对混凝土板进行预应力，这种用于钢-混凝土复合梁的新施工方法能够减轻连续梁中混凝土开裂的风险，从而提高安全性和使用寿命。桥梁。为了研究预应力复合截面中的复杂应力和应变分布及其随时间的非线性演变，本研究提出了三维（3D）粘弹塑性损伤本构模型。在该模型中，用弹塑性损伤模型描述混凝土的瞬时响应，并根据改进的比率类型公式估算随时间变化的混凝土蠕变和收缩率。与当前实践中广泛使用的一维（1D）弹性分析相比，该模型提供了在施工和使用过程中整个复合截面内的应力和应变分布的详细而现实的信息。在一个真实连续梁的案例研究中，基于所提出的模型，估计了混凝土收缩，蠕变和开裂对复合截面长期性能的耦合影响。此外，对养护时间的参数研究表明，通过控制混凝土收缩率可以进一步改善这种新的施工方法。

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  • 来源
    《Journal of bridge engineering》 |2018年第3期|04017145.1-04017145.16|共16页
  • 作者

    Tong Teng; Yu Qiang; Su Qingtian;

  • 作者单位

    Southeast Univ, Dept Civil & Environm Engn, Nanjing 210096, Jiangsu, Peoples R China;

    Univ Pittsburgh, Dept Civil & Environm Engn, Pittsburgh, PA 15206 USA;

    Tongji Univ, Dept Bridge Engn, Shanghai 200092, Peoples R China;

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