地震研究

基于转动摩擦铰阻尼器(RFHD),提出了转动摩擦耗能干式装配梁-柱节点(DRFDBJ)。为了验证DRFDBJ结构对于实现预期力学性能的可行性和合理性,以施加在摩擦片表面的螺栓预紧力(Pc)为变量,开展了2个工况下的DRFDBJ试件低周往复拟静力试验研究。结果表明:DRFDBJ结构的力学性能主要由RFHD提供并控制,试验中节点呈现了稳定的承载力和理想的变形、耗能能力,并实现了预期的损伤集中; 2个不同Pc水准下节点承载力的试验值与理论值误差不超过5%,通过调整Pc可实现节点承载力的调控,为DRFDBJ结构承载力的可调控提供了支撑。

Based on rotational friction hinge damper(RFHD),the dry-connected rotational friction dissipative beam-to-column joint(DRFDBJ)is proposed.Such a joint is expected to feature a good energy-dissipation capacity,adjustable performance as well as concentrated damage.To validate the feasibility and rationality of the DRFDBJ for achieving the expected mechanical performance,two load cases of pseudo-static cyclic experimental tests are carried out.The pre-tension force applied on the surface of the friction pads(Pc),which is a critical parameter of DRFDBJ,is selected as the test variable.The results indicate that the mechanical properties of DRFDBJ are mainly provided and determined by RFHD.Stable strength,stable deformation and energy dissipation capacities are exhibited in the tests.The expected damage-concentration feature of the joint is achieved.The errors between the experimental value and the theoretical value of the joint bending moment strength with two Pc- values are not more than 5%.The strength of DRFDBJ could be adjusted by varying Pc-value,thus laying a foundation for the strength adjustment of DRFDBJ.The results could serve as a reference for relative investigations on dry-connected precast concrete structures and frictional energy dissipation devices.

引言
1 DRFDBJ结构
2 试验方案
3 试验结果
4 结论

图1 DRFDBJ结构三维(a)和拆解(b)示意图<br/>Fig.1 3-dimensional(a)and disassembly(b)diagrams of the DRFDBJ

图1 DRFDBJ结构三维(a)和拆解(b)示意图
Fig.1 3-dimensional(a)and disassembly(b)diagrams of the DRFDBJ

图2 DRFDBJ弯矩-转角理论曲线<br/>Fig.2 Theoretical moment-rotation curve of the DRFDBJ

图2 DRFDBJ弯矩-转角理论曲线
Fig.2 Theoretical moment-rotation curve of the DRFDBJ

图3 DRFDBJ试件尺寸与配筋图<br/>Fig.3 Dimension and reinforcements of the DRFDBJ specimen

图3 DRFDBJ试件尺寸与配筋图
Fig.3 Dimension and reinforcements of the DRFDBJ specimen

图4 DRFDBJ试件安装顺序<br/>Fig.4 Assembly steps of the DRFDBJ specimen

图4 DRFDBJ试件安装顺序
Fig.4 Assembly steps of the DRFDBJ specimen

表1 钢板和钢筋力学性能参数<br/>Tab.1 Properties of steel plates and reinforcements

表1 钢板和钢筋力学性能参数
Tab.1 Properties of steel plates and reinforcements

图5 试验加载装置示意图(a)及面外约束实景图(b)<br/>Fig.5 Diagram of the loading device(a)and the external constraint(b)

图5 试验加载装置示意图(a)及面外约束实景图(b)
Fig.5 Diagram of the loading device(a)and the external constraint(b)

图6 试验加载制度
Fig.6 Loading protocol

图7 位移计布设示意图(a)及螺栓预紧力测量实景图(b)<br/>Fig.7 Arrangement of displacement meters(a)and measurement of bolt pretightening force(b)

图7 位移计布设示意图(a)及螺栓预紧力测量实景图(b)
Fig.7 Arrangement of displacement meters(a)and measurement of bolt pretightening force(b)

图8 DRFDBJ试件加载前(a)及加载至正向最大位移(b)示意图<br/>Fig.8 Deformation of the DRFDBJ specimen before(a)and after loading(b)

图8 DRFDBJ试件加载前(a)及加载至正向最大位移(b)示意图
Fig.8 Deformation of the DRFDBJ specimen before(a)and after loading(b)

图9 摩擦片(a)、柱端耳板(b)和梁端耳板(c)的接触磨损痕迹<br/>Fig.9 Abrasion of the friction plate(a),the lug at column end(b),and the lugat beam-end(c)after the test

图9 摩擦片(a)、柱端耳板(b)和梁端耳板(c)的接触磨损痕迹
Fig.9 Abrasion of the friction plate(a),the lug at column end(b),and the lugat beam-end(c)after the test

图10 DRFDBJ试件荷载-梁端位移滞回曲线<br/>Fig.10 Hysteretic curves of load vs displacement at beam-end of the DRFDBJ

图10 DRFDBJ试件荷载-梁端位移滞回曲线
Fig.10 Hysteretic curves of load vs displacement at beam-end of the DRFDBJ

图11 DRFDBJ试件骨架曲线<br/>Fig.11 Skeleton curves of the DRFDBJ[

图11 DRFDBJ试件骨架曲线
Fig.11 Skeleton curves of the DRFDBJ[

表2 DRFDBJ试件骨架曲线特征点<br/>Tab.2 Characteristic points of the skeleton curves of DRFDBJ

表2 DRFDBJ试件骨架曲线特征点
Tab.2 Characteristic points of the skeleton curves of DRFDBJ

图12 各梁端位移等级下DRFDBJ试件的滞回耗能<br/>Fig.12 Hysteretic dissipated energy of the DRFDBJ vs different values of displacement at beam-end

图12 各梁端位移等级下DRFDBJ试件的滞回耗能
Fig.12 Hysteretic dissipated energy of the DRFDBJ vs different values of displacement at beam-end

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备注

引言

1 DRFDBJ结构

2 试验方案

3 试验结果

4 结论

期刊信息