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The seismic ability of Hybrid RC component with the concrete which has low cracking strength and high toughness as a energy absorption element

以低裂强度高韧性混凝土作为吸能元件的混合RC构件的抗震能力

基本信息

批准号：
13650622
负责人：
HOMMA Ayato
金额：
$ 2.37万
依托单位：
University of Fukui
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

RC structure doesn't absorb energy before yielding, but once it yields and absorbs a large amount of energy, it causes a large residual deformation. One idea to control the response is an introduction of base isolation system or vibration control devices. Another idea is to give energy absorption ability to some building elements, and to combine it with another structural element. For example, RC column with wing walls has a big chance of shear failure because of its geometrical proportion. If the wing walls fail earlier and the column survives the damage, the wing walls will work similarly to a vibration control device. To realize this hybrid column, the wing walls should be made of a material that has low cracking strength and high toughness after cracking. It is difficult to increase toughness only by mixing chopped fiber with normal concrete. If the tensile strength of concrete is lowered by using super lightweight aggregate and the bond strength of fiber is not much reduced, it may be possible to increase the toughness. This study will describe the pilot test to verify an idea of the hybrid column, and the development of super ductile mortar for wing walls.And the following knowledge was acquired about the lightweight mortar. 1.If the rate of small particle of the aggregate increases, the strength of mortar will increase. 2 The optimal value of the rate of fiber mixing and an aggregate ratio exists which makes both bending strength and the amount of deformation as the maximum. 3.Possibility of giving the energy absorption ability by using for wing wall of a high strength RC pillar, and as one of the usage of high toughness fiber reinforcement concrete (mortar) was examined. 4.Before yielding of the main reinforcement of pillar, considerable quantity of equivalent viscous damping factor is expectable in small deformation angles and also the stability characteristic was shown after the yielding, so fiber reinforcement mortar can be able to be use as a wing wall.

钢筋混凝土结构在屈服前不吸收能量，但一旦屈服并吸收大量能量，就会产生较大的残余变形。控制响应的一个想法是引入基础隔离系统或振动控制装置。另一个想法是赋予一些建筑元素吸收能量的能力，并将其与另一个结构元素结合起来。例如，带翼墙的钢筋混凝土柱由于其几何比例的关系，有较大的剪切破坏可能性。如果翼壁较早失效，而柱在损坏中幸存下来，那么翼壁的工作原理与振动控制装置类似。为了实现这种混合柱，翼壁应采用低开裂强度和高开裂后韧性的材料。仅将短切纤维掺入普通混凝土中难以提高混凝土的韧性。如果使用超轻骨料降低混凝土的抗拉强度，而纤维的粘结强度降低不大，则有可能提高混凝土的韧性。本研究将描述验证混合柱概念的中试试验，以及用于翼墙的超延性砂浆的开发。并获得了以下关于轻质砂浆的知识。1.如果骨料的小颗粒率增加，砂浆的强度就会增加。2纤维掺混率和骨料比存在使抗弯强度和变形量均为最大值的最优值。3.探讨了高韧性纤维增强混凝土（砂浆）作为高强钢筋混凝土柱翼壁和高韧性纤维增强混凝土（砂浆）的一种使用方式来提高吸能能力的可能性。4.在柱主筋屈服前，在小变形角范围内可预见到相当数量的等效粘性阻尼系数，且屈服后表现出稳定特性，因此纤维增强砂浆可作为翼墙使用。