By combining the partial self-centering shape memory alloy(SMA) braces (SCB) with the shear slotted bolted connection-very short shear link (SSBC-VSSL),an innovative self-centering shear link (SC-SL) used in the eccentrically braced frame (EBFs ) that has an advantage of good energy dissipation capacity and self-centering capacity,low damage and excellent seismic resilience capacity is developed.Cyclic tests were carried on SC-SL specimens designed by the proposed method,so the deformation modes and hysteresis curves can be obtained.Based on the test results,ten SC-SL models with the effect of SMA areas,high-strength bolt pretensions and shim friction coefficients were designed and analyzed by the validated finite analysis (FE) method.The results show that the VSSL is in the relative static during the slip stage,then the development process of very short shear link (VSSL) in SSCB-VSSL including yield,bearing,energy dissipation and inelastic deformation are appeared sequentially during the non-slip stage,while the SMAs in SCB are always subjected to elongation,thus increasing the energy dissipating capacity and self-centering capacity.Finally,the simplified mechanical models of SC-SL in the slip stage and non-slip stage are proposed by using the FE results,which can provide a new way to give important seismic design reference for EBFs.
关键词
自复位耗能段/扩孔螺栓连接型耗能段/自复位SMA支撑/滞回曲线/力学模型
Key words
self-centering shear link(SC-SL)/shear slotted bolted connection with very short shear link (SSBC-VSSL)/self-centering SMA braces (SCB)/hysteresis curve/mechanical model
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