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Stress Transfer Mechanism of R/C and SRC Interior Beam-Column Joints

R/C和SRC内部梁柱节点应力传递机制

基本信息

批准号：
01550434
负责人：
JOH Osamu
金额：
$ 1.41万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1991
项目状态：
已结题

项目摘要

The object of this study is to clarify a stress transfer mechanism of interior beam-column joints in a reinforced concrete structure (R/C) or a steel and reinforced concrete structure (SRC), and to propose an evaluation of the shear strengths of the joints. The influence factors on these behaviors were supposed to relate to aspects of the beam-column joints. That is a raito of beam depth to column depth as the vertical aspect was selected in consideretion of effection on formation of diagonal strut in the joints. As the horizontal aspect ratios of three kinds of width to a column width were considered because of expecting different effection on stress transfer in each width. The three widths were a frange width of steel beam, a distance between the edge of the frange and a side frange of steel column, and a thickness of cover concrete beside the column frange. Experimental studies were carried out by using cross-shaped specimens with about a half scale under lateral cyclic reverals.Summary of results are expressed as follows : (1) Double diagonal struts were formed by separation of a transverse web plate of steel column. (2) The stress transfer mechamisms were different in the three zones. (3) Stiffness of a joint was depend on the vertical aspect of the joint. (4) Intical shear cracking strength should be evaluated in consideration of the vertical aspect and existing of the transverse web plate of steel column. (5) Ultimate shear strength was depend on the vertical joint aspect, frame effect consisted of four frange plates around a joint and each width of the three zones. (6) Equations to evaluate the joint strengths above were proposed by regression analysis.

本研究的目的是阐明钢筋混凝土结构(R/C)和钢与钢筋混凝土结构(SRC)内部梁柱节点的应力传递机理，并提出节点抗剪强度的评估方法。这些性能的影响因素被认为与梁柱节点的各个方面有关。也就是说，考虑到节点中斜支撑的形成，选择了梁高与柱高之比作为竖向。由于期望三种宽度对应力传递的影响不同，所以考虑了三种宽度对一柱宽的水平高宽比。这三个宽度是钢梁的宽度，钢柱边缘到钢柱侧面的距离，以及柱子旁边的保护层混凝土厚度。采用约半比例的十字形试件进行了水平反复荷载作用下的试验研究，主要结果如下：(1)钢柱横向腹板的分离形成了双斜压杆。(2)三个区域的应力传递机制不同。(3)节点的刚度取决于节点的竖直方向。(4)考虑钢柱横向腹板的竖向和存在时，应考虑钢柱的抗剪强度。(5)节点的极限抗剪强度取决于节点的竖向，框架效应由节点周围的四块板和三个区域的宽度组成。(6)通过回归分析，提出了上述节点强度的计算公式。