钢筋砼摩擦耗能支撑框架结构的单元刚度和力学模型分析

Analysis of Element Stiffness and Mechanics Model of Reinforced Concrete Frame Structure with Friction Energy Dissipation Braces

为研究钢筋砼摩擦耗能支撑框架结构的动力反应性能 ,对其中的摩擦耗能器单元和框架杆单元的单元刚度和力学模型做了分析。钢筋砼摩擦耗能支撑单元由支撑杆单元和钢板—橡胶摩擦耗能器单元组成 ,支撑单元可取空间杆单元 ,摩擦耗能器单元为平面应力矩形单元。摩擦耗能器单元的剪切恢复力曲线为理想的弹塑性曲线 ,根据耗能器单元的力学模型 ,可确定其在每一时刻的刚度 ;框架结构空间杆单元的恢复力模型采用双线型模型 ,根据杆单元的力学模型 ,可确定其在每一时刻的刚度。并利用所编制的程序对十层单榀两跨空间普通框架和摩擦耗能支撑框架在地震作用下进行了弹塑性反应时程分析 。

To study the dynamic response performance of reinforced concrete frame structure with friction energy dissipation braces,the element stiffness and mechanics model of the element of friction energy dissipation device and the element of frame bar are analyzed.The element of friction energy dissipation braces is composed of bracing bars and steel plate-rubber friction energy dissipation device.The brace element can be assumed as space bar and the element of friction energy dissipation device can be assumed as plan stress rectangle element.The shear restoring force curve of the element of friction energy dissipation device is ideal elastic-plastic curve.According to the mechanics model of the friction energy dissipation device element,we can determine its stiffness at any time.The restoring force model of the space bar element of the frame structure is assumed as double line model.According to the mechanics model of the bar element,we can also determine its stiffness at any time.Then the elastic-plastic response anslysis in all time of a ten-floor common space frame and a frame with friction energy dissipation braces in the effect of earthquake is preformed by the program made by the author,and the results indicate that the maximum displacement of the crest floor of frame with friction energy dissipation braces is less than that of the common frame.