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斜向水平荷载作用下两向不等肢配箍钢筋混凝土框架柱抗剪试验研究
Test Research of Rectangular RC Frame Columns with Different Area of Stirrups in Two Direction Under Bilateral Load
【作者】 郭永亮；
【导师】 王铁成；
【作者基本信息】 天津大学 ， 结构工程， 2004， 博士
【摘要】 关于斜向水平荷载作用下矩形截面钢筋混凝土框架柱的斜截面受剪承载力,国内外的研究表明,当两个主轴方向上配箍量相等时双向受剪承载力的相关关系符合椭圆规律;但是,在实际工程中,两个主轴方向上的实际配箍量往往并不相等,而对两个主轴方向上配箍量不相等的矩形截面钢筋混凝土框架柱在斜向水平荷载作用下的受力性能、破坏机理和双向受剪承载力相关关系,以及双向受剪承载力的设计和校核方法,国内外尚未进行,因而对此进行试验研究和分析具有十分重要的意义。本文通过试验对两个主轴方向上配箍量不相等的矩形截面钢筋混凝土框架柱在斜向水平荷载(包括单调荷载和反复荷载)作用下的受力性能和破坏机理进行了深入分析和研究,得到了两个主轴方向上配箍量不相等的矩形截面钢筋混凝土框架柱在斜向水平荷载作用下的双向受剪承载力相关关系。在已有的两个主轴方向上配箍量相等的矩形截面钢筋混凝土框架柱双向受剪承载力的最小体积用钢量法、规范分析法和三折线简化设计方法的基础上,将这些方法扩展到两个主轴方向上配箍量不相等时的情况,并提出了引入双向受剪承载力降低系数的设计方法,将两个主轴方向上配箍量相等或不相等的双向受剪承载力计算公式统一起来,然后从经济性和安全性两个方面对各种方法进行了综合考察。随后,通过对已有单向抗剪理论模型的分析和总结,提出了双向受剪的受力理论模型——双向桁架—拱理论,分析研究表明该理论具有很好的适用性和应用价值。最后,本文对两个主轴方向上配箍量不相等的矩形截面钢筋混凝土框架柱在斜向水平荷载作用下的延性性能、耗能能力和刚度退化等抗震性能进行了分析和研究。
【Abstract】 In contrast with the work reported on the shear behavior—— which could be described in a correlation equation of ellipse——of reinforced concrete frame (RCF) columns with the same area of stirrups in directions corresponding to the principal axes of the rectangle section under bilateral horizontal loads, the behavior of RCF columns with different area of stirrups in both principal directions has received little attention. In this study, the shear behavior and mechanism of damage of RCF columns with different area of stirrups in both directions were studied both experimentally and analytically. Firstly, based on test researches, a correlation equation of bilateral shear strength of RCF columns with different area of stirrups under skewed horizontal load was brought forward. Secondly, The Method of Minimal Volume of Used Stirrups, Criterion Analysis Method and Three-Line Segments Method were extended and compared with the new built “Two-Way Shear Reduce Coefficient Method” economically and securely. Thirdly, based on the study of single-way shear capacity theory, a new theory which may be called “Two Way Truss-arch Model” was put forward to explain the two-way shear capacity of RCF and the calculated result shows that this method had a good applicability and useable value. Lastly, the seismic behavior of rectangular RCF columns under skewed horizontal cyclic loading such as the deformability and rigidity degeneration was examined.