Shear carrying capacity of Ultra-High Performance Concrete beams
Shear carrying capacity of Ultra-High Performance Concrete beams
复制标题
超高性能混凝土梁的抗剪承载力
DOI：
--
复制
发表时间：
2008
期刊：
影响因子：
--
通讯作者：
G. Bertram
中科院分区：
文献类型：
--
作者：
J. Hegger;G. Bertram
超高性能混凝土 (UHPC) 是一种高科技材料，尤其为细长结构带来了新的机遇。在德国研究基金会 (DFG) 支持的合作研究项目“超高性能混凝土可持续建筑 (UHPC)”中，亚琛工业大学结构混凝土研究所开发了预应力梁的设计模型。进行了多项试验来研究带或不带腹板开口的 UHPC 预应力混凝土梁的粘结锚固和剪切承载性能。 1 锚固性能对抗剪力的影响 支撑上方的预应力对于计算抗剪力至关重要。抗剪承载力的决定性贡献来自拱形作用，如图 1 所示。当锚固长度短于支撑悬伸时，全部预应力可用于强化拱形作用。竖向支撑反力与预应力和拱作用相对应。必须在支撑线前面传递的预应力对拱形作用没有贡献。为了研究锚固性能，进行了拉拔试验和小梁试验。制作预应力T形梁来测试锚固长度和剪切承载能力。
Ultra-High Performance Concrete (UHPC) is a high-tech material opening new opportunities especially for slender constructions. Within the collaborative research project “Sustainable Building with Ultra High Performance Concrete (UHPC)” supported by the German Research Foundation (DFG) design models for pretensioned beams have been developed at the Institute of Structural Concrete at RWTH Aachen University. Several tests were performed to investigate the bond anchorage and the shear carrying behavior of prestressed concrete beams made of UHPC with or without web openings. 1 INFLUENCE OF THE ANCHORAGE BEHAVIOR ON SHEAR RESISTANCE The prestressing force above the support is essential to calculate the shear resistance. A decisive contribution of the shear carrying capacity arises from arch action as presented in figure 1. When the anchorage length is shorter than the support overhang, the full prestressing force is available to intensify arch action. The vertical support reaction corresponds with the prestressing and the arch action. Prestressing forces, which have to be transferred in front of the support line, do not contribute to the arch action. To investigate the anchorage behavior pull-out test and small beam tests were performed. Pretensioned T-beams were fabricated to test the anchorage length and the shear carrying capacity.