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首页> 美国卫生研究院文献>Materials >A Semi-Empirical Deflection-Based Method for Crack Width Prediction in Accelerated Construction of Steel Fibrous High-Performance Composite Small Box Girder
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A Semi-Empirical Deflection-Based Method for Crack Width Prediction in Accelerated Construction of Steel Fibrous High-Performance Composite Small Box Girder

机译：基于半经验挠度的钢纤维高性能复合材料小箱梁加速施工裂缝宽度预测方法

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摘要

Accelerated construction in the form of steel–concrete composite beams is among the most efficient methods to construct highway bridges. One of the main problems with this type of composite structures, which has not yet been fully clarified in the case of continuous beam, is the crack zone initiation that gradually expands through the beam width. In the current study, a semi-empirical model was proposed to predict the size of cracks in terms of small box girder deflection and intensity of load applied on the structure. To this end, a set of steel–concrete composite small box girders were constructed by the use of steel fibrous concrete and experimentally tested under different caseloads. The results were then used to create a dataset of the box girder response in terms of beam deflection and crack width. The obtained dataset was then utilized to develop a simplified formula providing the maximum width of cracks. The results showed that the cracks initiated in the hogging moment region when the load exceeded 80 kN. Additionally, it was observed that the maximum cracked zone occurred in the center of the beam due to the maximum negative moment. Moreover, the crack width of the box girder at different loading cases was compared with the test results obtained from the literature. A good agreement has been found between the proposed model and experiment results.
机译：钢-混凝土复合梁形式的加速施工是建造公路桥梁的最有效方法之一。这种类型的复合结构的主要问题之一（在连续梁的情况下尚未完全阐明）是裂纹区域的萌生，该裂纹区域逐渐扩展到整个梁的宽度。在当前的研究中，提出了一个半经验模型，以小箱梁挠度和结构上的荷载强度来预测裂缝的大小。为此，通过使用钢纤维混凝土构造了一套钢-混凝土复合小箱梁，并在不同的情况下进行了试验。然后将结果用于根据梁的挠度和裂缝宽度创建箱形梁响应的数据集。然后，将获得的数据集用于开发提供最大裂纹宽度的简化公式。结果表明，当载荷超过80 kN时，裂纹会在弯矩区开始。另外，由于最大负力矩，观察到最大的裂纹区域出现在光束的中心。此外，将箱形梁在不同荷载情况下的裂缝宽度与从文献中获得的测试结果进行了比较。在提议的模型和实验结果之间找到了很好的协议。

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