侧向冲击载荷下钢管混凝土结构的动力响应及参数分析  

Dynamic response and parameter analysis of concrete-filled steel tubular structure under lateral impact loading

作　　者：姜珊[1] 路国运[1] 杨会伟[1] JIANG Shan;LU Guoyun;YANG Huiwei(College of Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China)

机构地区：[1]太原理工大学土木工程学院,山西太原030024

出　　处：《爆炸与冲击》2023年第11期26-37,共12页Explosion and Shock Waves

基　　金：国家自然科学基金(12172244)。

摘　　要：采用刚塑性结构模态分析法和数值模拟方法,对侧向冲击载荷作用下的圆截面钢管混凝土结构进行了塑性动力分析。将钢管混凝土等效为刚塑性地基梁模型,给出了钢管混凝土构件跨中侧向变形的模态解析解,得到了冲击载荷作用下影响结构最终侧向变形的无量纲参数。利用ABAQUS/Explicit软件建立了钢管混凝土结构在侧向冲击作用下的动态响应数值模型并进行了计算分析,将理论预测值和数值模拟结果与试验结果进行了交叉对比。结合量纲分析和数值模型对影响构件最终变形的几何、物理参数及初始冲量进行了分析。结果表明:理论预测值和数值模拟结果与试验结果吻合较好,结构的塑性变形与理论假定的塑性铰分布一致。构件几何参数中,长径比和径厚比对其侧向最终变形有较大影响;冲击头相对宽度可改变构件的变形模态;相比于几何参数,钢管和混凝土芯层的物理参数对构件跨中挠度的影响较小;结构的侧向变形与初始冲量成二次幂相关。最后给出了理论分析参数的适用范围。刚塑性响应模态解可较好地预测钢管混凝土结构在侧向冲击载荷作用下的塑性变形行为。By employing the mode approximation method for rigid-plastic structural dynamic behavior and numerical simulation,a dynamic response analysis was conducted on circular-section concrete-filled steel tubular(CFST)structures subjected to lateral impact loadings.The mechanical model of the CFST structure was equivalently represented as a rigidplastic foundation beam model according to its plastic behavior.Under the linear velocity field assumption and the geometric similarity,the equivalently initial velocity for mode approximation of the structure was derived and compared with the existing experimental data.An analytical solution for the plastic lateral deformation at the mid-span of the CFST with two fixed ends by the rigid-plastic mode approximation method was provided,yielding non-dimensional geometric and physical parameters that influenced the ultimate lateral plastic deformation.A numerical model of the CFST structure under lateral impact was established using ABAQUS/Explicit.The theoretical and numerical predictions were both compared with existing experimental global deformations.Dimensional analysis and numerical modeling were combined to analyze the geometric and physical parameters,as well as the initial impact impulse,which influence the plastic deformation of the CFST structure.The results demonstrate a good agreement between the theoretical,numerical results,and experimental data,confirming that the plastic deformations of the structure align with the assumed distribution of plastic hinges.For geometric variables,the ratio of length to diameter and ratio of thickness to diameter exert a significant influence on the final lateral deformation.The relative width of the indenter can alter the deformation shape of the structure.The physical parameters of the steel tube and core concrete have less impact on the deflection at the mid-span compared with the geometric variables.The final lateral deformation of the CFST structure exhibits a quadratic correlation with the initial impact impulse.Finally,the applic

关 键 词：钢管混凝土 侧向冲击 模态分析法 有限元分析 

分 类 号：O347[理学—固体力学]