Shear Behavior of Reinforced Concrete Beam-Column Joints Subjected to Bi-Lateral and Varying, Axial Loads

承受双边和变化轴向载荷的钢筋混凝土梁柱节点的剪切行为

基本信息

批准号：
10650570
负责人：
KITAYAMA Kazuhiro
金额：
$ 2.24万
依托单位：
TOKYO METROPOLITAN UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

Two three-dimensional interior beam-column joint subassemblage specimens removed from a reinforced concrete space frame were tested to investigate failure mechanism in a joint panel under bi-lateral and axial loading. The anchorage ability of beam bars within a joint was chosen as a test parameter. Steel plates were placed at the beam critical sections in one specimen to carry directly the anchorage reaction force from beam longitudinal bars to the joint panel concrete. Slabs were not placed in both specimens for simplified path of load transfer. Concrete compressive strength was 23 MPa. Result of the plane beam-column joint specimen tested last year was compared with that of three-dimensional specimens to research on the effect of transverse beams to joint behavior. All specimens failed in joint shear. Following conclusions are drawn from the test.(1) Horizontal load carrying capacity for three-dimensional specimen with beam bar anchorage plates at beam critical sections and cracked t … More ransverse beams was enhanced to 1.1 times that without anchorage plates and 1.3 times that for plane specimen without transverse beams.(2) Joint shear capacity was enhanced by confining action due to anchorage plates against the out-plane expansion of joint core concrete. On the other hand, anchorage plates at beam critical sections caused bond deterioration along beam bars within a joint because development length of beam bars was limitted equally to a column depth by the plate.(3) Transverse beams framing into a joint contributed to enhance joint shear strength by the restriction to both expansion and damage of joint core concrete. Confining force by transverse beams to joint concrete was one fourth approximately of tensile force of longitudinal beam bars in loading direction.(4) The shape of bi-directional interaction in joint shear capacity was regarded as not circle but square under bi-lateral loading in three-dimensional subassemblage specimens. This means that safety to earthquake excitations can be maintained for reinforced concrete beam-column joint in actual frames by designing joints to shear forces in each direction independently. Less

测试了从钢筋混凝土空间框架中取出的两个三维内部梁列关节亚件仪表，以研究双侧和轴向载荷下的关节面板中的故障机制。选择接头内的梁条的锚固能力作为测试参数。将钢板放在一个样品中的梁临界切片上，以将锚固反应力直接从梁纵杆到关节面板混凝土中。板未放在两个样本中，以简化负载转移路径。混凝土抗压强度为23 MPa。去年测试的平面梁柱标本的结果与三维标本进行了比较，以研究横梁对关节行为的影响。所有标本的关节剪切失败。从测试中得出以下结论。（1）在梁临界部分处有三维样品的水平载荷承载能力，并破裂……增加了1.1倍，没有锚固板和1.3倍的平面样品，而没有横向横梁的侧面均应构成侧面构成的固定构成的固定构成应有的固定构成应有的固定构成，应延伸到应有的固定固定物。另一方面，梁临界部分处的锚固板沿关节内的梁条引起了键的定义，因为梁条的发育长度的限制了板的限制。（3）横向梁框架成框架的横向梁构造成一个关节，从而有助于增强关节剪切强度，从而限制了关节芯混凝土的膨胀和损坏。将横梁限制在关节混凝土上是纵向杆杆的拉伸力的四分之一，沿载荷方向限制。（4）双向相互作用以关节剪切能力中的双向相互作用的形状被认为是不是圆，而是在三维亚升级的双边载荷下的平方。这意味着，可以通过独立地设计关节来独立剪切力，以在实际框架中维持地震兴奋的安全性刺激。较少的