| After the Wenchuan earthquake, the post-seismic retrofitting of damaged structuredue to earthquake has drawn wide attention in earthquake engineering. Because ofthe advantages such as good energy damping capacity, simplification of mechanicalmodel, convenience of construction and so on, friction damper device has widelyused in retrofitting and new construction. The friction energy dissipation technologythat applied to post-seismic retrofitting can not only simplify construction, shortenconstruction period, but also greatly improve the seismic performance of thedamaged structures. In order to develop the large-tonnage friction damper device andprovide reference for its engineering application, an experimental study of thehysteretic behavior of a new structural friction damper device and an experimentalstudy of the seismic behavior of the damaged frames retrofitted with friction damperdevice were investigated.A slotted-bolted-plate friction damper (SBPFD) was proposed. The SBPFD wastested under low cyclic loading to investigate the influence of clamping forces, slipdisplacements amplitude and material of friction plates on the seismic behavior ofthe friction damper device. The test results indicated that:(1) the shape of hysteresiscurves of the SBPFD was rectangular, approximately. The SBPFD has good andstable energy dissipation ability.(2) With the increase of clamping force, the slipmechanism of SBPFD with brass friction plate changed from friction type tofriction-interlock type. Based on the test results, the calculation formula of initial slipforce and the restoring force model of the SBPFD were proposed. The calculatedresults agree well with the test ones.The experimental study of the seismic behavior of1full-scale of emptydamaged frame and3full-scale of damaged frames with friction damper brace underlow cyclic loading were investigated. The results indicated that:.(1) The shape ofhysteresis curves of friction damper frames were spindle, approximately, whichindicated the friction damper frames had strong energy dissipation capacity.(2) thedamaged frames with friction damper brace can effectively improve the maximumload and the ultimate load. With the increase of clamping force, the strength of the retrofitting specimens was increase.(3) The damaged frames with friction damperbrace had powerful energy dissipation capability. In every displacement amplitude,the total energy dissipation of friction damper frame were higher than the damagedand undamaged frames, which indicated that the energy dissipation capability ofdamaged frame could be recovered through the reasonable retrofitting.At last, based on the tests results, the construction method and technology ofadding friction damper brace to damaged frames were discussed. |
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