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Research on Estimation Method of Deformation Capacity of Reinforced Concrete Encased Steel under Varying Axial Force and Bi-Axial Horizontal Force

变轴力和双轴水平力作用下钢筋混凝土钢筋变形能力估算方法研究

基本信息

批准号：
11650580
负责人：
KATO Daisuke
金额：
$ 2.3万
依托单位：
Niigata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

(1) PurposeIt aims at explaining the validity of a method to evaluate the deformation capacity of the steel framed reinforced concrete (abbreviated as SRC hereafter) beam-columns under varying axial force, on the basis of a method under constant axial force.(2) Research programThe static loading test of the SRC specimens were carried out under varying axial force or constant axial force. These specimens were subjected to the lateral force in the direction of the principal axis of the section or in the direction at 45 degrees. Furthermore, it was analyzed about the deformation capacity of the SRC beam-columns by the data including the experiment data from literature materials.(3) Result of researchFlexural yield occurred before shear failure in all specimens. The limit rotation angle^<*1)> in the case that N/Nu^<*2)> changed from 0.5 to -0.2 was about 7x10^<-2> radian, and a little poor in comparison with the case that N/Nu = 0.3 or N/Nu changed from 0.3 to -0.1. A lateral force condition didn't exert a great influence on the result of the experiment. The axial force ratio at the maximum strength under compressive axial force and the flexural strength ratio of the steel portion have a great influence to the limit rotation angle in the case of varying axial force. By modification of the appraisal method in the case of constant axial force, it could be mostly evaluated.Note:*1) The axial compressive strength superposing that of the steel portion and the RC portion.*2) The rotation angle of the member of which strength declines to 80% of the maximum strength.(4) SummaryIt has been shown that the deformation capacity of SRC beam-columns subjected to the varying axial force could be mostly evaluated by modifying the appraisal method in the case of the constant axial.

(1)目的在常轴力法的基础上，提出一种评估变轴力作用下钢框架钢筋混凝土（以下简称SRC）压弯构件变形能力的方法。(2)研究方案对型钢混凝土试件进行了变轴力和恒轴力作用下的静载试验。这些试样在截面主轴方向或45度方向上承受横向力。并结合文献资料中的试验数据，对型钢混凝土压弯构件的变形能力进行了分析。(3)研究结果所有试件的弯曲屈服均发生在剪切破坏之前.在N/Nu（*2）>从0.5变化到-0.2的情况下，极限旋转角（*1）>为约7 × 10 - 6<-2>弧度，并且与N/Nu = 0.3或N/Nu从0.3变化到-0.1的情况相比稍差。侧向力条件对试验结果影响不大。在轴力变化的情况下，最大抗压强度时的轴力比和型钢的抗弯强度比对极限转角有很大的影响。通过对轴力恒定的情况下的评价方法进行修改，可以进行大部分的评价。注：*1）钢筋部分和钢筋混凝土部分的轴向抗压强度叠加。2)强度下降到最大强度的80%的构件的旋转角度。(4)研究表明，在轴力不变的情况下，对型钢混凝土压弯构件在变轴力作用下的变形能力评价方法进行修正，可以得到较好的评价结果。