摘要
针对抗震混合试验边界条件模拟问题,提出非线性条件下框架结构边界条件模拟方法。建立钢框架数值模型进行结构非线性动力时程分析,研究梁柱线刚度比、地震动放大系数、轴压比及长细比4种影响因素下对钢框架柱反弯点位置的影响,并依据数值模拟反弯点分布规律开展反弯点法抗震混合试验,将试验结果与非线性数值模拟结果对比。结果表明,梁柱线刚度比对框架柱反弯点分布规律和底层柱的剪力分配有较大影响,其他因素影响不显著。反弯点法抗震混合试验在结构弹性与弱非线性阶段表现良好,在结构进入较强非线性阶段的位移时程曲线与非线性数值模拟结果较为接近,但在耗能能力上存在差异。
Aiming at the boundary condition simulation problem of seismic hybrid simulation,a simulation method for boundary conditions of frame structures under nonlinear conditions is proposed.A numerical model of steel frames is established for nonlinear dynamic time history analysis of structures.The effects of four factors,namely,the linear stiffness ratio of beams to columns,the amplification coefficient of ground motion,the axial compression ratio,and the slenderness ratio,on the location of the reverse bending points of steel frame columns are studied.Based on the distribution of the inflection points in the numerical simulation,hybrid seismic simulation using the reverse bending point method is conducted,and the test results are compared with the results of nonlinear numerical simulation.The results show that the linear stiffness ratio of beam to column has a significant impact on the distribution of inflection points of frame columns and the shear distribution of the bottom columns,while other factors have no significant impact.The hybrid seismic simulation using the inflection point method performs well in the elastic and weak nonlinear stages of the structure.The displacement time history curve in the strong nonlinear stage of the structure is relatively close to the nonlinear numerical simulation results,but there are differences in energy dissipation capacity.
作者
蔡泽文
刘晨光
田石柱
CAI Zewen;LIU Chenguang;TIAN Shizhu(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou 215011,China;Shanghai Zhenhua Heavy Industries Co.,Ltd.,Shanghai 200125,China)
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2024年第2期280-290,共11页
Journal of Guangxi University（Natural Science Edition）
基金
国家自然科学基金项目(52208189)
江苏省高等学校基础科学(自然科学)面上项目(21KJB580006)。
关键词
抗震混合试验
反弯点法
边界条件
结构非线性
框架柱反弯点分布
seismic hybrid simulation
inflection point method
boundary condition
nonlinear structure
distribution of inflection points of frame columns
