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为开发轻质高效的结构耗能阻尼器并将其应用于空间结构振动控制,利用国产铝合金作为防屈曲耗能支撑的核芯材料,并对研制的6个支撑试件进行了拟静力试验。按照稳定理论设计的试件在试验中未发生整体失稳,铝芯板与约束钢管间预留一定间隙并填充锂基润滑脂以消除套箍效应和减小界面摩擦。试验结果显示:支撑在受拉和受压时都能屈服而不屈曲,铝芯板应变强化现象明显,滞回曲线稳定饱满,有较高的耗能能力,其拉压峰值不均匀系数不超过1.3。基于Chaboche钢材循环塑性本构模型,通过试验数据对相关铝材模型参数进行了标定,并将其应用于防屈曲支撑的有限元分析,计算结果与试验曲线吻合良好,相关模型参数能够进一步应用于结构抗震弹塑性分析。
In order to develop lightweight and efficient structural energy-dissipating dampers and apply them to the vibration control of the space structure, the domestic aluminum alloy is used as the core material for buckling-proof energy-dissipating support, and the quasi-static test. Specimens designed according to the stability theory did not experience any overall instability in the test. A certain gap was reserved between the aluminum core plate and the confined steel pipe and the lithium grease was filled to eliminate the ferrule effect and reduce the interface friction. The test results show that the support can yield without buckling when tensioned and pressed, the strain hardening of the aluminum core plate is obvious, the hysteresis curve is stable and full, and has a high energy dissipation capacity. The peak non-uniform coefficient of tension and compression does not exceed 1.3. Based on the cyclic plastic constitutive model of Chaboche steel, the relevant aluminum model parameters were calibrated by experimental data and applied to the finite element analysis of buckling brace. The calculated results are in good agreement with the experimental curves and the related model parameters can be further applied to Seismic Elastoplastic Analysis.