A New Visco-Plastic Device for Seismic Protection of structures
241页1、 A New Visco-Plastic Device for Seismic Protection of Structures Yasser El-Husseini Ibrahim Dissertation submitted to the faculty of the Virginia Polytechnic Institute and State University in partial fulfillment of the requirements for the degree of Doctor of Philosophy In Civil and Environmental Engineering Dr. Finley A. Charney Dr. Thomas M. Murray Dr. Raymond H. Plaut Dr. Carin L. Roberts-Wollmann Dr. Mahendra P. Singh 02-07-2005 Blacksburg, VA Keywords: Visco-plastic, Viscoelastic, Dampers,
2、Passive control, Seismic, Earthquakes. Copyright 2005, Yasser Ibrahim A New Visco-Plastic Device for Seismic Protection of Structures Yasser E. Ibrahim Abstract A new visco-plastic damper for seismic protection is introduced. This device combines and enhances many of the proven characteristics of both displacement-dependent and velocity-dependent devices. The device consists of a block of a high-damping viscoelastic material sandwiched between two steel shapes (plates or channels) bent in a cert
3、ain configuration to amplify the deformations in the device in order to obtain large tensile and compressive strains in the viscoelastic material. Under low levels of vibrations, the device dissipates energy through amplified strains in the viscoelastic material only; however, under moderate to strong levels of vibrations, a new source of energy dissipation is added through the yielding of the steel elements. The inelastic behavior of the steel elements is controlled by the rigidity of the visco
4、elastic material. In addition to the energy dissipation, the device provides stiffness through the steel elements as well as the viscoelastic material. Moreover, one of the main advantages of the device is that its behavior is fully controlled through different parameters. First, a nonlinear time history analysis was conducted on structures with a preliminary model of the device using SAP2000 program to check the effectiveness of the device on the response of different structures under ground ex
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