Creation of New Architectural Spaces Utilizing 200N/mm^2 Ultra-High-Strength Fiber-Reinforced Concrete

本研究的目的是将200 Mpa级超高强纤维混凝土(UFC)与钢筋混凝土相结合，开发出一种新的建筑结构，以创造出满足高层建筑、大柱跨度和小截面构件需求的新的建筑空间。为使UFC在建筑抗震结构中得到实际应用，于2004-2006年在广岛大学进行了一系列UFC建筑构件和部分框架(内梁柱节点)的地震荷载试验。1)采用高强度或超高强度的侧向配筋约束柱，即使在很高的轴压下也能获得稳定的抗震性能。2)钢纤维显著提高了梁柱节点的抗剪强度。内梁-c-…试验结果更多的柱节点由预制的200 Mpa-UFC壳柱和60 Mpa的混凝土梁组成。1)基于现有设计公式预测的梁柱节点没有发生粘结劈裂破坏。2)节点的抗剪强度明显高于现有设计公式计算的抗剪强度。3)考虑UFC中钢纤维对节点抗剪强度的贡献，可以较好地评价节点的抗剪强度。1)当考虑UFC的抗拉强度时，可以很好地评价UFC柱或UFC壳柱的抗弯强度。2)当充分考虑UFC抗拉强度的贡献时，可以较好地评估UFC或UFC壳柱的抗剪强度，从而阐明了当充分考虑UFC中钢纤维的贡献时，可以很好地评估构件和框架的抗弯强度和抗剪强度。这是UFC在实际使用方面的一大进步。较少

The purpose of this study is to develop a new building structure which combines the 200MPa class ultra-high-strength fiber-reinforced concrete (UFC) with reinforced concrete so that new architectural spaces which meet the needs of higher building, longer column span and smaller member section may be created. In order to put the UFC to practical use for earthquake resistant building structures, a series of seismic loading test of members and partial frames (interior beam-column joints) in a UFC building were conducted in Hiroshima University in 2004 through 2006.Results of the test of UFC columns and interior beam-column joints using UFC for both beams and columns were summarized as follows. 1) Stable seismic behavior of columns could be obtained even under very high axial compression when they were confined with high-or ultra-high-strength lateral reinforcement. 2) Steel fibers significantly contributed to enhance the shear strength of beam-column joints.Test results of interior beam-c … More olumn joints which consisted of precast 200MPa-UFC shell columns and 60MPa concrete beams were summarized as follows. 1) Bond splitting failure did not occur in the beam-column joints in which such a failure was predicted based on the existing design equations. 2) The shear strength of the joints was significantly higher than those calculated by the existing design equations. 3) The shear strength of the joints could be well evaluated when the contribution of steel fibers in UFC to the shear strength are taken into account.The flexural test of beams to investigate the tensile strength of UFC and associated discussions indicated the followings. 1) The flexural strength of a UFC column or a UFC shell column can be well evaluated when the tensile strength of UFC are taken into consideration. 2) The shear strength of a UFC or a UFC shell column can be well evaluated when the contribution of tensile strength of UFC is adequately taken into consideration.Thus it was clarified that the flexural strength and the shear strength of members and frames could be well evaluated when the contribution of steel fibers in UFC were adequately taken into account. This was a great advance of UFC for practical use. Less