双轴反复荷载作用下钢筋混凝土空间框架结构滞回全过程分析

实际地震中结构所承受的地震作用是多维的。结构的恢复力特性是反映其抗震性能的一个重要属性。对地震作用下钢筋混凝土柱、梁塑性铰区的计算模型进行了分析,给出了塑性铰区等效长度的简便计算公式;建立了“有限纤维”空间线性梁单元模型并推导出了其刚度矩阵;使用“弥散法”来考虑梁锚固钢筋在结点区的粘结滑移对结构整体变形的影响。最后使用空间杆系模型对一承受双向反复荷载的框架结构进行了计算分析。分析表明所建立的计算模型是精确有效的。

Full-range Hysteretic Analysis of R/C Frame Structures Subjected to Biaxial Reversed Cyclic Loading

Seismic force applied to buildings is multi-dimensional. The restoring-force characteristic of structures is significant one of their features which reflect their ability to resist earthquakes. A simple formula for calculating effective length of plastic hinge of R/C column and beam was presented. A linear 3D-beam finite element model based on Finite Filament Model was developed and its stiffness matrix was derived. Slippage of anchor bars was taken into account in calculating the deformation of structures through "spreading into plastic hinge". 3D-frame structure model was used to conduct full-range hysteretic analysis of a R/C frame structure subjected to biaxial reversed cyclic loading. It is verified that the model presented in this paper be effective and accurate.