Qu Chun-Xu, Xu Yu-Wen, Gao Jin-He, Zhou Wei-Hao, Zheng Bao-Zhu, Li Peng
School of Civil Engineering, Dalian University of Technology, Dalian 116023, China.
School of Civil and Architectural Engineering, East China University of Technology, Nanchang 344000, China.
Materials (Basel). 2022 Oct 12;15(20):7085. doi: 10.3390/ma15207085.
The article proposes the use of a semi-rigid energy-dissipation connection combined with a U-shaped metal damper to avoid brittle failure of rigid steel beam-column connections under seismic loading. The U-shaped metal damper connects the H-section column and the H-section beam to form a new energy-dissipation connection as an energy-dissipation member. Compared with the existing research, this connection has a stable energy-dissipation performance and great ductility. To clarify the mechanism of energy dissipation, mechanical models under two U-shaped damping deformation modes are established. The calculation formulas for the yield load and stiffness are derived for the corresponding deformation mode using the unit load method. Taking the T-shaped beam-column connection and the application of U-shaped steel damper in the beam-column connection as an example, the mechanical model of the connection is established and the calculation formulas for the yield load and stiffness are derived. At the same time, the connection is subjected to a quasi-static test under cyclic loading. The results show that the hysteretic curve of the test is complete and that the skeleton curve is accurate compared to the theory. The error range of the initial stiffness and yield load obtained by the test and the theoretical formula is kept within 20%, indicating that the theoretical formula is reasonable and feasible. In addition, the correctness of the finite element model is verified by establishing a finite element model and comparing it with the test. The mechanical responses of purely rigid connections and rigid semi-rigid composite connections are compared and analyzed using a multi-story and multi-span plane frame as an example. The results show that the model with semi-rigid connections, compared to the model with rigid connections, avoids the gradual loss of bearing capacity caused by the failure of the connection area of the second floor of the main structure and improves the seismic performance of the main structure.
本文提出采用一种半刚性耗能连接与U形金属阻尼器相结合的方式，以避免刚性钢梁-柱连接在地震作用下发生脆性破坏。U形金属阻尼器连接H型钢柱和H型钢梁，形成一种新型的耗能连接作为耗能构件。与现有研究相比，这种连接具有稳定的耗能性能和良好的延性。为阐明耗能机理，建立了两种U形阻尼变形模式下的力学模型。利用单位荷载法推导了相应变形模式下屈服荷载和刚度的计算公式。以T形梁柱连接及U形钢阻尼器在梁柱连接中的应用为例，建立了连接的力学模型并推导了屈服荷载和刚度的计算公式。同时，对该连接进行了循环加载下的拟静力试验。结果表明，试验滞回曲线完整，骨架曲线与理论相比准确。试验得到的初始刚度和屈服荷载与理论公式的误差范围保持在20%以内，表明理论公式合理可行。此外，通过建立有限元模型并与试验对比，验证了有限元模型的正确性。以一个多层多跨平面框架为例，对纯刚性连接和刚性半刚性组合连接的力学响应进行了比较分析。结果表明，与刚性连接模型相比，半刚性连接模型避免了主体结构二层连接区域破坏导致的承载力逐渐丧失，提高了主体结构的抗震性能。
