Research Initiation: An Investigation of the Effect of Steel Fibers on the Vibrational Characteristics of Regular Reinforced and Prestressed Concrete Beams

在钢筋混凝土梁中加入钢纤维可以显著提高构件的力学性能。然而，关于钢纤维对规则钢筋和预应力混凝土受弯构件振动特性影响的研究很少。本研究计划的目的是通过实验确定在常规钢筋和预应力混凝土梁中添加钢纤维对这些结构构件的振动特性（频率和阻尼）的影响。动力响应随纤维类型、体积纤维含量、规则配筋率和预应力配筋率以及混凝土强度的变化将作为研究参数。通过自由振动和强制振动试验的结果来评估试件的动态特性。所有的样品都将在简支和悬臂梁结构中进行测试。从这个研究项目中获得的结果将开始确定在常规钢筋和预应力混凝土构件中添加钢纤维是否会导致结构阻尼的显著增加。

The addition of steel fibers to reinforced concrete beams has been determined to significantly enhance the mechanical properties of the member. However, little research has been reported concerning the effect of steel fibers on the vibrational characteristics of regular reinforced and prestressed concrete flexural members. The objective of this research program is to experimentally determine the influence of adding steel fibers to regular reinforced and prestressed concrete beams on the vibrational properties (frequency and damping) of these structural members. The change in dynamic response as a function of fiber type, volumetric fiber content, regular and prestressing reinforcement ratios and concrete strength will be the parameters of study. The dynamic properties of the flexural test specimens will be assessed from the results of free vibration and forced vibration tests. All specimens will be tested in both simply supported and cantilever beam configurations. The results obtained from this research project will begin to determine if the addition of steel fibers to regular reinforced and prestressed concrete members will result in a significant increase in structural damping.