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碟簧-钢绞线组合自复位防屈曲支撑滞回性能

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为解决传统自复位防屈曲支撑变形能力不足的问题，提出一种碟簧-钢绞线组合自复位防屈曲支撑(Disc Spring-Steel Tendon Self-centering Buckling-restrained Brace，DT-SCB)。DT-SCB采用串联的钢绞线及碟簧组成的复位系统提供复位能力，通过两个并联的一字型内芯耗散地震能量。介绍了DT-SCB构造、各阶段工作机理及恢复力模型。建立有限元模型，研究复位比率αsc、钢绞线与碟簧组刚度比K1、复位元件与耗能系统刚度比K2等参数对支撑滞回性能、自复位效果及耗能能力的影响。研究结果表明:提出的DT-SCB恢复力模型与模拟结果吻合较好，所有DT-SCB支撑在最大加载位移(2。5%轴向应变)内未发生明显破坏，支撑滞回曲线呈旗帜型特征，且具有稳定的耗能能力。相比于传统基于钢绞线的自复位防屈曲支撑，DT-SCB具有更强的变形能力。DT-SCB最大残余变形随复位比率αsc提高显著减小，而刚度比K1的增加会削弱复位比率对支撑残余变形的控制效果。钢绞线与碟簧组刚度比过大(K1≥2。0)会导致碟簧组提前被压平，进而降低支撑的变形能力。DT-SCB耗能能力受刚度比K2影响较大，其等效黏滞阻尼比随刚度比K2的增大而降低。罕遇地震下支撑-框架结构非线性时程分析结果表明，DT-SCB可以有效减少结构的最大层间位移角及残余层间位移角，提高结构抗震性能。
Hysteretic Performance of Disc Spring-Steel Tendon Self-centering Buckling-restrained Brace
The self-centering buckling-restrained brace combined both disc springs and steel tendons(DT-SCB)was proposed to solve the shortage problem of the deformation ability of the traditional self-centering buckling-restrained brace(SCBRB).The steel tendons in series with combination disc springs are used to provide the self-centering force,and two parallel flat steel cores are responsible for dissipating seismic energy.The detailed configuration,working mechanism at different stages,and restoring force model of DT-SCB were introduced in this study.The finite element model was established,through which the effect of self-centering ratio αsc,the ratio of steel tendons and combination disc springs K1 and the ratio of self-centering unit and energy dissipation system K2 on the hysteretic behavior,self-centering level and energy dissipation capacity of DT-SCB were conducted,respectively.The results indicated that the proposed DT-SCB restoring force model agreed well with that from numerical simulation.No obvious failure characteristics were observed even if the maximum loading displacement(corresponding to the axial strain of 2.5%)was achieved.The hysteretic curve of DT-SCB was flag-shaped,with stable energy dissipation.The deformation ability of proposed DT-SCB was significantly greater than that of the conventional SCBRB with steel tendons.The maximum residual displacement sharply decreased with the increasing self-centering ratio,while the greater K1 weakened the control effect of αsc on residual deformation.The disc springs were prematurely flattened with an excessive ratio of self-centering system and energy dissipation system(K1≥2.0),which would reduce the deformation capacity of DT-SCB.The stiffness ratio K2 had a significant influence on the energy dissipation capacity of DT-SCB,and the equivalent viscous damper ratio of DT-SCB decreased with the increase of the stiffness ratio K2.The nonlinear dynamic analysis results of the braced frame subjected to severe earthquakes showed that DT-SCB can effectively reduce the maximum and residual inter-story drifts and improve the seismic performance of the frame.

self-centering buckling-restrained bracedisc springsteel tendonnumerical simulationhyster-etic behavior

鲁军凯、戴首昆、许国山、李文鹏、李金平、李毅飞、许兴哲

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东北林业大学 土木与交通学院,黑龙江 哈尔滨 150040

哈尔滨工业大学 土木工程学院,黑龙江 哈尔滨 150090

自复位防屈曲支撑 碟簧 钢绞线 数值模拟 滞回性能

国家自然科学基金资助项目国家自然科学基金资助项目黑龙江省自然科学基金资助项目国家大学生创新创业训练计划项目

5197821351908108LH2022E00520220225273

2024

10.16339/j.cnki.hdxbzkb.2024070

湖南大学学报(自然科学版)
湖南大学

湖南大学学报(自然科学版)

CSTPCD北大核心
影响因子：0.651
ISSN：1674-2974
年,卷(期)：2024.51(7)
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