摘要
准确评估钢筋混凝土柱的抗震性能,对于保证混凝土结构地震作用下的安全性具有重要意义。为采用Pushover方法合理评估钢筋混凝土柱的抗震性能,通过对PEER钢筋混凝土柱抗震性能试验数据库中数据的分析,提出了1种确定弯剪荷载下柱荷载-变形曲线、卸载刚度和再加载刚度的计算方法,并给出了按滞回环面积等效确定等效阻尼比的公式。柱的荷载-变形曲线是以传统的弯曲截面分析为基础、考虑剪力和柱端钢筋拔出的滑移影响而进行修正得到的;卸载刚度和再加载刚度是分别对其与柱割线刚度的关系进行统计分析确定的。最后以一单自由度体系为例说明了按模型建立柱的"能力曲线"以及对柱进行Pushover分析的方法,并就剪跨比、轴压比以及配筋率等参数对柱抗震性能的影响进行了分析。
Accurate assessment of seismic performance of reinforced concrete columns（RC columns）is significant to ensure the safety of reinforced concrete structure subjected to earthquake action.In order to derive a reasonable prediction by Pushover analysis,a calculation method for determining lateral load-deformation curve,unloading rigidity and reloading rigidity of RC columns subjected to combined flexural and shear force is proposed based on test data analysis in the PEER（Pacific Earthquake Engineering Research Center） Structural Performance Database,and the formula for calculating the equivalent damping ratio according to hysteresis loop area is also provided.In this paper,conventional section analysis techniques are employed for modeling the flexural behavior of lateral load-deformation relationship,and the modified formulas with actual data analysis are implemented for modeling the effect of shear and slip of the longitudinal bars at columns end.Unloading rigidity and reloading rigidity of the columns are determined by statistical analysis on relations between themselves and secant rigidity of the columns respectively.Finally,a single-degree of freedom（SDOF） system is taken as an example to illustrate the applications of the proposed model for developing the corresponding ＂capacity curve＂ and performing pushover analysis on columns.The influences of primary parameters,such as shear-span ratio,axial load ratio,reinforcement ratio and stirrup ratio,on seismic performance of columns are also analyzed.
出处
《土木建筑与环境工程》
CSCD
北大核心
2011年第6期51-58,共8页
Journal of Civil,Architectural & Environment Engineering
基金
国家自然科学基金重点资助项目(90815027)
关键词
钢筋混凝土柱
抗震性能
PUSHOVER分析
荷载-变形曲线
等效阻尼比
reinforced concrete column
seismic performance
Pushover analysis
lateral load-deformation curve
equivalent damping ratio
