Caterino Nicola, Spizzuoco Mariacristina, Piccolo Valeria, Magliulo Gennaro
Department of Engineering, University of Naples Parthenope, 80100 Naples, Italy.
Institute of Technologies for Construction, National Research Council (CNR), 20098 Novate Milanese, Italy.
Materials (Basel). 2022 Jan 19;15(3):759. doi: 10.3390/ma15030759.
The work proposes an innovative solution for the reduction of seismic effects on precast reinforced concrete (RC) structures. It is a semi-active control system based on the use of magnetorheological dampers. The special base restraint is remotely and automatically controlled according to a control algorithm, which modifies the dissipative capability of the structure as a function of an instantaneous dynamic response. The aim is that of reducing the base bending moment demand without a significant increase in the top displacement response. A procedure for the optimal calibration of the parameters involved in the control logic is also proposed. Non-linear modelling of a case-study structure has been performed in the OpenSees environment, also involving the specific detailing of a novel variable base restraint. Non-linear time history analyses against natural earthquakes allowed testing of the optimization procedure for the control algorithm parameters, finally the capability of the proposed technology to mitigate seismic risk of new or existing one-story precast RC structures is highlighted.
该研究提出了一种创新解决方案，用于减少地震对预制钢筋混凝土（RC）结构的影响。它是一种基于磁流变阻尼器的半主动控制系统。特殊的基础约束根据控制算法进行远程自动控制，该算法根据瞬时动态响应修改结构的耗能能力。目的是在不显著增加顶部位移响应的情况下减少基础弯矩需求。还提出了一种用于控制逻辑中参数最优校准的程序。在OpenSees环境中对一个案例结构进行了非线性建模，其中还涉及一种新型可变基础约束的具体细节。针对天然地震的非线性时程分析允许测试控制算法参数的优化程序，最终突出了所提出技术减轻新建或现有单层预制RC结构地震风险的能力。
