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Anchorage configuration for post-tensioned NSM CFRP upgrading constructed bridge girders

机译：后张NSM CFRP升级构造桥梁的锚固配置

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摘要

This paper presents the configuration of anchorage and corresponding behavior for strengthening constructed prestressed concrete bridge girders using post-tensioned near-surface mounted (NSM) carbon fiber reinforced polymer (CFRP) strips. Optimization techniques are employed to best determine anchorage details required, based on the Localized Random Search and the Generalized Reduced Gradient associated with established design approaches. Three-dimensional finite element modeling is followed to examine the response of the strengthened girders in the vicinity of the anchorage where the NSM CFRP is terminated. The failure of the anchorage is controlled by concrete breakout rather than bolt failure in shear when post-tensioning is implemented. The NSM CFRP causes a complex strain distribution near the bottom flange, including some regional rotation of the concrete layer. An influential zone across the girder web is noticed within which the applied energy is dissipated substantially, in conjunction with the existence of a local tension field. The degree of local strain discontinuity along the strengthened girder is dependent upon the level of post-tensioning and an effective strain zone is found beyond which such a post-tensioning effect does not influence the girder concrete.
机译：本文介绍了使用后张紧的近表面安装（NSM）碳纤维增强聚合物（CFRP）板条来加固预应力混凝土桥梁大梁的锚固结构和相应的行为。基于与建立的设计方法相关联的局部随机搜索和广义减少梯度，采用优化技术来最佳确定所需的锚固细节。进行了三维有限元建模，以检查NSM CFRP终止处的锚固附近的加固大梁的响应。实施后张拉时，锚固的破坏是由混凝土的开裂而不是由螺栓的破坏控制的。 NSM CFRP在底部法兰附近引起复杂的应变分布，包括混凝土层的某些区域旋转。注意到横跨腹板腹板的影响区域，在该区域中，所施加的能量与局部张力场的存在一起被基本上消散。沿加强梁的局部应变不连续程度取决于后张拉的水平，并且找到了一个有效应变区，在该范围之外，这种后张拉效果不会影响梁混凝土。

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