Evaluation of the flexural behavior of composite beam with inverted-T steel girder and steel fiber reinforced ultra high performance concrete slab
Evaluation of the flexural behavior of composite beam with inverted-T steel girder and steel fiber reinforced ultra high performance concrete slab
复制标题
DOI：
10.1016/j.engstruct.2016.03.052
复制
发表时间：
2016-07
影响因子：
5.5
通讯作者：
S. Yoo;J. Choo
中科院分区：
文献类型：
--
作者：
S. Yoo;J. Choo
超高性能混凝土（UHPC）的开发及其优异性能的利用已成为国内外研究的热点.在这些成果中，提出了各种解决方案，以实现最佳组合梁使用钢纤维增强UHPC。为了提高材料的经济性，提出了一种由超高性能混凝土板和无上翼缘钢梁组成的组合梁。在这种组合梁中，倒T形钢梁需要在腹板上设置栓钉，以便与UHPC板组合。考虑到缺乏研究评估这种新型的组合梁的抗弯性能，本研究通过实验研究了抗弯性能与栓钉间距和板厚度。为了实现这一目标，八个组合梁与不同的栓钉间距和UHPC板厚度一起制作了两个额外的组合梁使用普通混凝土板没有钢纤维钢筋进行比较。此外，提出了在材料模型中考虑钢纤维增强UHPC的拉伸软化行为和梁构件相应的应变协调条件的分析方法。分析结果与试验结果的对比表明，预测结果具有较好的精度，表明经验拉伸软化曲线能够合理地反映型钢UHPC组合构件的实际受力性能。
Huge efforts have been made to develop ultra high performance concrete (UHPC) and exploit its remarkable properties. Among the achievements, various solutions were proposed to achieve optimal composite beams using steel fiber reinforced UHPC. In order to increase the economy in material, a composite beam combining a slab made of UHPC and a steel girder without top flange is proposed. In this composite beam, the inverted-T steel girder requires the studs be arranged on the web for the composition with the UHPC slab. Considering the absence of studies evaluating the flexural behavior of this new type of composite beam, this study examines experimentally the flexural behavior with respect to the stud spacing and slab thickness. To that goal, eight composite beams with varying stud spacing and UHPC slab thickness were fabricated together with two additional composite beams using slabs made of normal concrete without steel fiber reinforcement for comparison. In addition, an analysis method considering the tension-softening behavior of steel fiber reinforced UHPC in the material model and the corresponding strain compatibility conditions of the beam member is proposed. The comparison of the analytic and experimental results reveals the good accuracy of the predictions indicating that the empirical tension-softening curve reflects reasonably the actual behavior of steel reinforced UHPC composite member.