Viscoelastic damper connected to adjacent structures involving seismic isolation

• Main Authors: Vasant Annasaheb Matsagar, Radhey Shyam Jangid
• Format: Article
• Language: English
• Published: Vilnius Gediminas Technical University 2005-12-01
• Series: Journal of Civil Engineering and Management
• Subjects: adjacent buildings; earthquake; elastomeric bearing; seismic base isolation; sliding system; retrofit
• Online Access: http://localhost/journals.vgtu.lt/index.php/JCEM/article/view/8925

The seismic response of multiâ€storied baseâ€isolated structure to various types of isolation systems connected using viscoelastic dampers to the adjacent dissimilar baseâ€isolated or fixedâ€base structure is investigated. The multiâ€storied structures are modelled as a shear type structures with lateral degreeâ€ofâ€freedom at each floor, which are connected at different floor levels by viscoelastic dampers. The performance of this combination is studied by deriving the governing equations of motion and solving it in the incremental form using Newmark's stepâ€byâ€step method of integration. The variation of top floor absolute acceleration of both the buildings and bearing displacement under different real earthquake ground motions is computed to study the behaviour and effectiveness of resulting connected system. It is concluded that connecting the two adjacent baseâ€isolated buildings with the viscoelastic dampers is useful in controlling large bearing displacements in the baseâ€isolated structures thereby eliminating the isolator damages arising due to instability at these large displacements or pounding with adjacent ground structures during earthquakes. The viscoelastic damper connection between adjacent structures is found to be most effective when the adjacent baseâ€isolated and fixedâ€base buildings are connected. Such scheme is hence useful in upgrading the seismic performance of existing fixedâ€base structures adjacent to a baseâ€isolated structure. Seisminei izoliacijai skirtas su gretimu statiniu sujungtas klampiai tamprus slopintuvas Santrauka TyrinÄ—jamas daugiaaukÅ¡Äiu statiniu su įvairiomis izoliavimo sistemomis ir klampiai tampriais slopintuvais, sujungtais su kitais analogiÅ¡kais statiniais, seisminis atsakas. DaugiaaukÅ¡Äiai pastatai modeliuoti Å¡lyties tipo konstrukcijomis su skersiniais laisvÄ—s laipsniais kiekvienam aukÅ¡tui. AukÅ¡tai sujungti skirtinguose lygiuose klampiai tampriais slopintuvais. Tokios sistemos laikysena tyrinÄ—ta sudarant pagrindines judÄ—jimo lygtis ir jas sprendžiant žingsnis po žingsnio taikant tiesioginio integravimoâ€Niumarko metodÄ…. ApskaiÄiuota abiejų struktÅ«rų virÅ¡utinio aukÅ¡to absoliuÄiojo pagreiÄio ir atramos poslinkio variacija tam, kad bÅ«tų nustatyta sujungtos sistemos laikysena ir jos efektyvumas. Nustatyta, kad naudinga jungti gretimus izoliuotus pastatus klampiai tampriais slopintuvais siekiant mažinti didelius atramų poslinkius ir kartu iÅ¡vengti izoliatorių pažeidimu dÄ—l žemes drebÄ—jimų. Nustatyta, kad jungtis taikant klampiai tamprius slopintuvus yra pati efektyviausia, kai gretimi pastatai yra su izoliuotomis bei fiksuotomis atramomis. TodÄ—l Å¡is bÅ«das naudingas gerinant fiksuotų atramų pastatų seisminį atsparumÄ…, kai jie yra Å¡alia pastatų su izoliuotomis atramomis. ReikÅ¡miniai žodžiai: gretimi pastatai, Å¾emÄ—s drebÄ—jimas, elastomerinÄ— atrama, seisminis pagrindo izoliavimas, slankioji sistema, renovacija, klampiai tamprus slopintuvas. First Published Online: 14 Oct 2010