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Experimental Study on Elasto-Plastic Behavior of Composite Steel and Reinforced Concrete Beam-Columns under Arbitrary Horizontal Force.

任意水平力作用下钢与钢筋混凝土组合梁柱弹塑性行为的试验研究。

基本信息

批准号：
60550393
负责人：
MORINO Shosuke
金额：
$ 1.47万
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 (C)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

项目摘要

The elastic-plastic behavior of the composite steel and reinforced concrete(abbreviated as SRC hereafter)long beam-columns under the arbitrary horizontal force was investigated by the experiment, and compared with the analytical results. The built-up H-shaped steel encased in concrete has a cross section of H-50x50x3.2x3.2mm. The longitudinal and transverse reinforcement arrangement were identical in all specimens and consist of 4 <phi> bars.Experimental parameters selected for the investigation are as follows; 1) Slenderness ratio( ratio of the beam-column length to the radius-of-gyration of concrete cross section ): 20 and 50, 2) Ratio of the axial load to the maximum axial strength: 0, 0.2 and 0.33, 3) Direction of the horizontal load: 0゜, 22.5゜ and 45゜.The obtained results are summarized as follows; 1) The maximum carrying capacity of a short SRC beam-column is determined by the crash of concrete, and that of a long beam-column by the instability. 2) The value of the biaxial bending moment capacity of a long SRC beam-column computed at the maximum horizontal load is smaller than the value given by the interaction obtained from the ultimate strength theory, while that of a short beam-column reaches the interaction curve. 3) When the flexural stiffnesses of the beam-colum are fifferent in two principal axes as observed in the present test, the increment of the displacement corresponding to the strong axis bending slows down, and eventually starts decreasing because of P <DELTA> -moment. Finally, the beam-column seems to shift to the condition of the uniaxial bending. 4) An abrupt failure occurrs when the increment of the displacement corresponding to the strong axis bending becomes neally zero.

通过试验研究了型钢-钢筋混凝土组合长梁柱在任意水平力作用下的弹塑性性能，并与理论分析结果进行了比较。外包混凝土的组合H型钢截面为H-50x50x3.2x3.2mm。所有试件的纵筋和横筋布置均相同，均由4根钢筋组成<phi>（梁柱长度与混凝土截面回转半径之比）：20和50，2）轴向荷载与最大轴向强度之比：0、0.2和0.33，3）水平荷载方向：结果表明：1）型钢混凝土短梁柱的最大承载力主要取决于混凝土的破坏，而型钢混凝土长梁柱的最大承载力主要取决于失稳。2)在最大水平荷载作用下，长型钢混凝土梁柱的双向弯矩承载力计算值小于极限强度理论的相关系数，而短型钢混凝土梁柱的双向弯矩承载力则达到相关系数曲线。3)当梁柱在两个主轴方向上的抗弯刚度不同时，由于P弯矩的作用，对应于强轴弯曲的位移增量变慢，并最终开始减小<DELTA>。最后，梁柱似乎转移到单轴弯曲的条件。4)当轴向强弯曲引起的位移增量接近零时，即发生突然破坏。