| 刘霞,鲁亮,仲健林*,蒋丽娟.体外预应力自复位框架试验分析[J].实验力学,2019,34(6):981~990 |
| 体外预应力自复位框架试验分析 |
| Experimental analysis of external prestressed self-centering frame |
| 投稿时间：2018-04-08 修订日期：2018-05-05 |
| DOI：10.7520/1001-4888-18-070 |
| 中文关键词: 体外预应力自复位框架 钢绞线张拉 拟静力试验 滞回曲线 耗能能力 |
| 英文关键词:External Prestressing Self-centering Frame (EPSCF) steel strand tensioning quasi-static test hysteresis curve energy dissipation |
| 基金项目:国家自然科学基金(51678453)，国家重点研发计划(2016YFC0701101)，江苏省青年自然科学基金(BK20170837) |
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| 中文摘要: |
| 地震过程中传统钢筋混凝土结构通过梁柱节点的塑形变形耗散地震能量，虽然能保证主体结构不倒，但结构中产生的不可恢复变形，给震后结构的维护修补带来巨大经济压力。故本文提出了一种体外预应力自复位框架(EPSCF)，耗能件在地震过程中发生塑性变形耗散地震能，地震过后结构通过自复位机制实现结构的自复位。首先设计了一榀试验模型并进行了钢绞线参数的计算。鉴于模型中梁、柱、基础之间均为铰接，钢绞线中的预应力提供结构刚度，故预应力张拉应采取“两端同时，对角张拉”的工艺。其次利用拟静力试验，对EPSCF结构施加往复循环作用，使结构在正反两个方向重复加载和卸载，以模拟地震时结构在往复运动中的受力特点和变形特点。研究结果表明：(1)EPSCF结构表现出良好的二次刚度特性，可为结构基于性能的抗震设计提供参考;(2)EPSCF结构设置的耗能机制耗能效果显著，可有效保护梁柱主体结构构件在地震过程中的完好性。 |
| 英文摘要: |
| Under the action of earthquake, structure consumes energy through plastic deformation to ensure that the main structure components do not collapse. Nevertheless, due to the non-recoverability of plastic deformation, the residual deformation after the earthquake is very large, and the direct and indirect economic losses are very serious. In this paper, a kind of external prestressed self-centering frame (EPSCF), is presented, which uses plastic deformation to dissipate seismic input energy, at the same time realizes self-centering of structure by prestressed steel strand. Firstly, an experimental model was designed and the parameters of the steel strand were calculated. Due to the fact that the beams, columns and foundations are hinged in the model, and the prestress in the steel strand provides the structural stiffness, the prestressed tension process should adopt the process of “simultaneous at both ends and diagonal tension”. Secondly, quasi-static experiment was used to apply the reciprocating cycle to the EPSCF structure, so that the structure can be repeatedly loaded and unloaded in both positive and negative directions to simulate the stress and deformation characteristics of structure in reciprocating motion.Results show that the secondary stiffness in EPSCF structure exhibits flexible design-ability; moreover, the excellent energy dissipation capacity of EPSCF structure is verified. |
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