钢阻尼器考虑水平2方向变形的简化滞回模型研究

A simplified hysteretic model for steel dampers considering horizontal bidirectional deformations

为了简单有效地模拟钢阻尼器在考虑水平2方向变形时的滞回性能,基于多重剪切弹簧力学模型和Menegotto-Pinto(MP)滞回模型提出一种改进的多重剪切弹簧(Modified Multi-Shear-Spring,MMSS)模型。将MP滞回模型作为MMSS模型中各弹簧的滞回曲线,其基本力学参数由钢阻尼器多方向的弹塑性变形性能确定,形状参数通过优化计算确定。以常用的U型钢阻尼元件为例,通过在单向循环位移、水平2方向规则循环位移以及随机位移下MMSS模型与阻尼器滞回曲线的比较,验证了提出的MMSS模型能较精确地模拟U型钢阻尼元件在考虑水平2方向变形时的滞回性能,为钢阻尼器的地震反应分析提供了一种简便的计算方法。

In order to simply and effectively simulate hysteretic performance of steel dampers considering horizontal bidirectional deformations,a modified multi-shear spring(MMSS)model was proposed based on the multi-shear spring mechanical model and Menegotto-Pinto(MP)hysteretic model.MP model was taken as each springs’hysteretic curve in MMSS model,and its basic mechanical parameters were determined with multi-directional elastoplastic deformations of steel dampers,its shape parameters were fitted by means of the self-adaptive genetic algorithm.Taking a commonly used U-shaped steel damper for example,through comparing the damper’s hysteretic curves under unidirectional cyclic displacements,horizontal bidirectional regular cyclic displacements and horizontal bidirectional random displacements obtained using finite element model and MMSS one,respectively,the results showed that MMSS model can accurately simulate hysteretic performance of the U-shaped damper considering horizontal bidirectional deformations,so the study provides a simple calculation method for steel dampers’seismic response analysis.