Strut-and-tie models for deteriorated reinforced concrete half-joints
Strut-and-tie models for deteriorated reinforced concrete half-joints
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劣化钢筋混凝土半节点的支柱拉杆模型
DOI：
10.1016/j.engstruct.2018.01.013
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发表时间：
2018
影响因子：
5.5
通讯作者：
Desnerck P
中科院分区：
文献类型：
--
作者：
Desnerck P
钢筋混凝土半接缝桥由悬跨短端梁或支撑在桥台尖端或相邻梁上的全宽桥面组成。其扰动区域的设计传统上是通过支柱和拉杆建模的方式进行的。标准和规范中的设计规定可用于评估现有结构，并进行细微调整。然而，当前的文件对于腐蚀、锚固长度不足和裂纹形成等劣化方面的纳入提供的指导有限。对 12 个半接头梁进行的实验证明了单个缺陷的影响，但也发现协同效应存在，并且可能导致比单个缺陷总和预期更高的减少量。将这些结果与不同的支柱拉杆模型 (STM) 进行比较，并讨论了 STM 的应用以实现承载能力的最高下限估计。对于当前工作中研究的梁，基于规范和标准的预测，结合考虑恶化影响的适当方法，得出了安全承载能力估计。然而，在某些情况下，所开发的 STM 似乎无法选择在达到某一特定容量时立即开发的替代负载路径。因此，实际容量可能高于 STM 计算得出的容量。
A reinforced concrete half-joint bridge consists of suspended span dapped-end beams or a full-width deck supported on the nibs of abutments or adjacent beams. The design of their disturbed regions is traditionally performed by means of strut-and-tie modelling. The design provisions found in standards and codes can be used for the assessment of existing structures with minor adjustments. However, current documents provide limited guidance on the incorporation of deterioration aspects such as corrosion, insufficient anchorage lengths, and crack formation. Experiments performed on 12 half-joint beams demonstrated the effects of single defects, but synergistic effects were also found to exist and might lead to much higher reductions than expected from the sum of individual defects. These results were compared to different strut-and-tie models (STMs) and the application of STMs to achieve the highest lower bound estimate of the load carrying capacity is discussed. For the beams studied in the current work, the predictions based on codes and standards, combined with appropriate methods to incorporate deterioration effects, led to safe load bearing capacity estimates. However, the developed STMs seem to be, in some instances, unable to pick up alternative load paths that develop as soon as the capacity of a certain tie is reached. Hence the actual capacities might be higher than what is obtained from the STM calculations.
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