【作者】 王诚；

【导师】 王铁成；

【作者基本信息】 天津大学 ， 结构工程， 2007， 硕士

【摘要】 国内外的研究表明,在斜向水平荷载作用下,当两个主轴方向上配箍量相等时,矩形截面钢筋混凝土框架柱的双向受剪承载力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,国内外尚无研究,对此进行研究对完善设计理论和设计方法具有十分重要的意义。本文针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进行试验,对斜向水平荷载(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深入分析和研究,采用有限元分析两向不等肢配箍混凝土框架柱在斜向水平荷载作用下的双向受剪承载力和相关关系。结果表明,不等肢配箍钢筋混凝土框架柱双向受剪承载力相关关系近似符合椭圆规律,在此基础上推导出适合于不等肢配箍矩形截面混凝土框架柱的双向受剪承载力计算公式。本文采用灰色系统理论的关联度分析方法,分析单调荷载作用和反复荷载作用下钢筋混凝土双向受剪构件受剪承载力的影响因素,并对各影响因素的显著性给予量化分析。分析结果表明:影响双向受剪承载力的因素的显著性依次是混凝土强度、剪跨比、配箍率与箍筋强度之积、纵筋配筋率、轴压比和斜向加载角度。更多还原

【Abstract】 In contrast with the work reported on the shear behavior which could be described in a correlation equation of ellipse of reinforced concrete 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 reinforced concrete columns with different area of stirrups in both principal directions has received little attention.In this paper, Firstly,the shear behavior and mechanism of damage of reinforced concrete columns with different area of stirrups in both directions were studied both experimentally and analytically. Secondly, In order to research seismic behavior of reinforced concrete columns, the shear strength of rectangular section reinforced concrete columns with different area of stirrups in two directions under lateral bevel load is investigated by nonlinear finite element method.The results of nonlinear analysis are compared with the results of experiment, and the correlation equation of bilateral shear strength of reinforced concrete frame columns under static load and low-reversed cyclic load is analyzed.Then, a new design method is also presented.It is show that the influences of the lateral bevel load on the shear strength of rectangular section reinforced concrete columns with different area of stirrups in two directions accord with the ellipse law, which may be served as reference for the design of shear strength of reinforced concrete columns with different area of stirrups in two directions.Lastly, the main influence factors,which affect the shear strength of bilateral shear reinforced concrete columns, are analyzed with grey-correlation method.The analysis result shows that:the influence degree on shear strength is reduced in turn with the concrete strength, the ratio of shear span to depth, the product of stirrup ratio and stirrup stength, the ratio of longitudinal reinforcement, the axial compression ratio, the load inclination.更多还原