基于电磁控制的屈曲约束支撑拟静力试验研究

Quasi-static tests of buckling restrained brace based on electromagnetic control

屈曲约束支撑是一种耗能减隔震构件,近年来已被广泛应用在工程实例中。但是将屈曲约束支撑和控制相结合的研究较少。基于此研制出一种新型屈曲约束支撑,即基于电磁控制的屈曲约束支撑(electromagnetic buckling restrained brace, EBRB)。对6组EBRB进行拟静力试验进行滞回曲线、骨架曲线、延性性能、刚度退化、耗能能力等性能指标分析,并推导出振动控制所需电磁力的计算公式。试验结果表明:通过对电磁力推导的理论值和试验中产生的电磁力实际值的比对发现两者的差值在8%左右,当EBRB填充材料为LC30芯材为Q235钢时其耗能能力是填充材料为C30芯材为DT4的1.08倍,延性性能是填充材料为C30芯材为DT4的1.2倍,并在电磁力的控制下构件的的抗震性能是不加电磁力的控制的1.3倍~1.5倍,提高了传统的屈曲约束支撑的抗震性能,在工程实例中具有较好的应用前景。

Buckling restrained brace is an energy dissipation and seismic isolation component,it is widely used in engineering actual examples at present.However,studying combination of buckling restrained brace and control is rare.Here,a new type buckling restrained brace based on electromagnetic control was developed,it was called electromagnetic buckling restrained brace(EBRB).Quasi-static tests for 6 sets of EBRB were conducted to do performance indexes analyses including hysteresis curve,skeleton curve,ductility performance,stiffness degradation,energy dissipation capacity,etc.,and derive the calculation formula of electromagnetic force required for vibration control.The test results showed that differences between theoretical values of the derived electromagnetic force and actual values generated in tests are about 8%;when EBRB filling material is LC30 and its core material is Q235 steel,its energy consumption capacity is 1.08 times that when EBRB filling material is C30 and its core material is DT4,and the former’s ductility performance is 1.2 times that of the latter’s;aseismic performance of components under control of electromagnetic force is 1.3-1.5 times that without electromagnetic force control;so EBRB improves its aseismic performance compared to traditional buckling restrained brace,and EBRB has better application prospects in engineering actual examples.