Experimental Study on Elasto-Plastic Behavior of Steel Reinforced Concrete Space Frames

钢骨混凝土空间框架弹塑性行为试验研究

基本信息

批准号：
62460169
负责人：
MORINO Shosuke
金额：
$ 4.42万
依托单位：
Mie University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

Elasto-plastic behavior of steel reinforced concrete (SRC) space frames subjected to constant axial thrust and repeated biaxial bending with shear is investigated exprimentally, in order to establish an evaluation method for the earthquake resistance ability of SRC structures. Frame specimen consists of a column and four beams arranged in two directions, which modilizes beam-and-column subassemblage in a real building frame. Cross sections of members are made of H-steel(column:2H-148x30x6x9, beam:H-180x50x6x9) and 4 main reinforecements encased in concrete. In the test, constant vertical load at the column top and constant beam loads at tips of beams in y-direction are first applied, the latter simulating the long-term load. Then, antisymmetric, alternately repeated shear loads are applied at tips of beams in x-direction simulating the earthquake load. Experimental parameters are selected as follows: vertical load ratio (0.2 and 0.4); intensity and pattern of beam loads corresponding t … More o the long-term load; and failure modes (column-failure type and panel-failure type). New findings obtained from the tests are as follows: As to column-failing specimens; (1) The column deforms with a sharp kink at the connection panel, and the vertical load cannot be sustained, because of the drastic strength deterioration due to P- effect in the final stage of loading; (2) Damage is observed at ends of both upper and lower columns in speciments with beam loads in y-direction, while it concentrates at the top end of the lower column in the specimen subjected to planer loading; (3) Biaxial bending decreases the deformation capacity, but increases the ultimate strength. As to panel-failing specimens; (4) Steel panel at the beam-to-column connection is subjected to large plastic strains, but damage on concrete is not much observed due to beam restraints; (5) Hysteresis loop is a stable spindle-type, and either degradation due to repeated loading or strength deterioration due to P- effect are not so severe as in the case of the column-failing specimens. Less

对钢筋钢筋混凝土（SRC）空间框架的弹性塑性行为进行了持续的轴向推力和剪切的重复双轴弯曲，以建立SRC结构地震抗性能力的评估方法。框架样品由一个圆柱和四个梁组成，该圆柱在两个方向上排列，可在真实的建筑物框架中调节光束和柱子的尺寸。成员的横截面由H钢（列：2H-148x30x6x9，梁：H-180x50x6x9）和4个主要的钢筋包装在混凝土中。在测试中，首先应用了Y方向的圆柱顶部的恒定垂直载荷，而在Y方向的横梁尖端的恒定梁负载是后来模拟长期载荷的。然后，在模拟地震载荷的X方向上，在梁的尖端上施加反对称，重复的剪切载荷。选择实验参数如下：垂直负载比（0.2和0.4）；梁负荷的强度和模式相应的t…更多o长期载荷；和故障模式（柱状类型和面板输出类型）。从测试中获得的新发现如下：关于柱状样品；（1）柱在连接面板处以尖锐的扭结变形，并且由于在加载的最后阶段的p效应所产生的巨大强度确定，垂直载荷无法持续；（2）在Y方向上的规格中，在上下柱的末端观察到损坏，而将其集中在受planer载荷的样品中的下柱的顶端；（3）双轴弯曲会降低变形能力，但增加了最终强度。至于面板出售标本；（4）横梁到柱连接处的钢板受到较大的塑料应变，但是由于梁约束，对混凝土的损坏并没有太多；（5）磁滞环是一种稳定的纺锤体类型，并且由于重复负载而引起的定义或由于P效应而引起的强度限制，并不像柱状式标本那样严重。较少的