【作者】 李辉；

【导师】 李哲；

【作者基本信息】 西安理工大学 ， 结构工程， 2008， 硕士

【摘要】 异形柱体系出现于上一世纪七十年代末,近几年的发展比较快,相关的研究也有很多成果,但是由于异形柱体系腹板和翼缘本身相对比较薄弱,截面不对称等因素的影响,承载力较低、延性较差,严重影响了该体系在实践中应用。尤其是异形柱在高烈度地区,《混凝土异形柱结构技术规程》JGJ149-2006规定异形柱在八度区的建筑物高度:框架体系不能超过12米,框架剪力墙结构不超过28米,这样就使得异形柱的应有受到极大的限制。已有资料表明在异形柱里加入钢骨可以很大程度的改善其延性,笔者在此基础上进一步研究了钢骨混凝土L形截面短柱的抗震性能。通过设计制作14根钢骨混凝土L形截面短柱和2根钢筋混凝土L形截面短柱,在考虑了剪跨比、轴压力系数、体积配箍率和配骨率等参数对L形柱抗震性能的基础上,进行了钢骨混凝土L形截面短柱的抗震性能低周反复荷载试验。试验过程中,观察L形柱裂缝的开展情况、破坏过程和破坏形态,得出钢骨混凝土L形短柱的破坏形态为:剪切斜压破坏和剪切粘结破坏两种。通过分析研究了钢骨混凝土L形截面短柱滞回曲线及主要试验参数对滞回曲线的影响,得出配骨率、配箍率、剪跨比增大时,所得滞回曲线较为丰满,曲线包含的面积较大,有较大的塑性变形能力,极限变形大:反之,得出相反的结论。而轴压力系数较高时,滞回曲线相对狭窄,变形能力小,循环次数较少。同时由滞回曲线得到骨架曲线,分析了轴压力系数、剪跨比、配箍率和配骨率对试件骨架曲线的影响,得出改变配骨率不会改变骨架曲线的形状;而改变轴压力系数能改变骨架曲线的形状;改变体积配箍率则只能改变骨架曲线的下降段等结论。最后简单分析并提出了位移延性比限值和轴压力系数限值,为钢骨混凝土L形短柱的合理设计提供科学依据。更多还原

【Abstract】 The special-shaped column system emerged in the late 1970s, in recent years, it has got a relatively fast development and the relevant research has also yielded a quantity of achievements, however, owing to the influences of the factors, such as the relatively weakness of the web and flange of the special-shaped column, and the asymmetry of the cross section and so on, the bearing capacity of the special-shaped column is low as well as the ductility is poor, which seriously affect the application of the system in practice. Especially in the high-intensity contour, according to the regulations of The Concrete Structure of the Special-Shaped Column of Order JGJ149-2006, which regulates the buildings height of the special-shaped column in eight seismic degree area: frame system can not be more than 12 meters, the Frame-shear wall structure more than 28 meters, which greatly restrict the application of the special-shaped columns. The existing data shows that add steel to the special-shaped column can improve its ductility to a large extent. Based on the fact, the author of this study carries out the further research on the seismic performance of the L-shaped cross section on steel reinforced concrete short columns, and the principal tasks are as follows.Production design by 14 L-shaped steel reinforced concrete columns and two L-shaped reinforced concrete columns, in considering the span ratio, axial pressure coefficient, the rate and volume hoop with the rate of bone parameters on the L-shaped columns on the basis of performance, the L-shaped steel reinforced concrete columns of the seismic performance of low-week trial. The testing process, observation of the L-shaped column in cracks, damage and destruction of shape, L-shaped steel reinforced concrete columns for the damage pattern: shear baroclinic destruction and damage of two shear bond.Analysis of the L-shaped steel reinforced concrete columns hysteresis curve and the major test parameters on the hysteresis curve of the impact of that with the rate of bone, hoop rate, shear span ratio increases, from more fullness hysteresis curves, curve contains a large area, larger plastic deformation ability to limit big deformation; Instead, the opposite conclusion. And axial pressure coefficient is low, the hysteresis curve relatively narrow, small deformation, recycling less frequently. At the same time received by the hysteresis curve skeleton curves of the axial pressure coefficient, inter-cut than with hoop rate and the rate of bone with specimen skeleton curves the impact of that change will not change with the rate of bone skeleton curve shape; change Axial pressure coefficient matrix can change the shape of curve; volume hoop rate of change can only change the skeleton curves of the decline in such conclusions. Finally simple analysis and the displacement ductility than the restrictions and pressure coefficient values week for the L-shaped steel reinforced concrete columns designed to provide a reasonable scientific basis.更多还原