Theoretical And Experimental Study On Viscous Dampers And Lead Dampers

The article contain s ten chapters,which divi deds into four parts,and the emphasis is the performance experim e ntal studying on dam p er s in oder to of f e r th eo ries and tech nical bases for dampers. industrialization and e ngineering. The research progress and current situation of the vibration c ontrol of building structures, especially the dissipational structural are reviewed in the fist chapter .A nd there is series studying on visous damper , which including the theoretic study on vi sous damper , medium , confirmation, and perform a nce experim e nts from the second ch apter to the eighth chapter . Perform a nce experim e ntal study on two kinds of lead dam p ers is performed in the ninth chapter . In the chapter 10,a sim u lated earthquake shaking-tabl e experim e ntal study on a isolated syste m of bridge installing visous dam p ers is accom p lished.Alao us ing the theo ry of the b a se up-low control system to give the reasonabl e explanation,in the end there is further sim u lating analysis. V i sous damper has speed-related dam p er whi c h depends on visous touching and the af fect of hole to dissipation. the latter is the author . s opinion according to liquid m echanics. part losing theory . It gives the perfect dissipation theory of visous dam p er .The n it talks about three kinds of structural of da mper . s orifice ,which is based on classified study of dif f erent structural visous dam p er . According above study , the author m a nufactured a series of dam p ers ,which including single outing bar , double outing bar , orifice typ e , clearance, com b ina tional type ,also develop a da m p er which m a tchs the buf fer protecting sets. Am ong which are alm o st full scale visous dam p ers. Perform a nce experim e ntation indicates that visous da m p er has the sam e character , such as satiation hysteresis loops , little add i tio n al stif f n ess ,and the f o rce lies down as alm o st 90 phase, dissipation for small displa c e m ent. But dif f erent sorts of dam p ers has dif f erent perfor m ance because of dif f erent stru ctu r al and m e dium , it reflects m o st on the nonlinear coef ficient param e ter of velocity . V i sous m e dium with good perform a nce is one of the key factors about the steady di- ssipation of visous dam p ers. The author ca rry out experim e ntal study on perform a nce of the four sorts of visous m e dium , which includes silicon oil hydraulic oil the m a terial with high m o lecular weight and m i xed liquid; the result of the experim e nt indicates that com p ressibility of hydraulic oil is biger , special m i xed liquid likely to sedim e nt and other factors, which m a ke these m e dium not fit to som e structural visous dam p ers. visous m e d- ium ； Silicon oil and silica gel have som e characters such as no color and no taste little com p ressibility nonvolatilization resisting hign tem p eratureonburning ,and so on , which m a ke they are fit as the m e dium of visous dam p er .Also study out the reasonable suitable rules between dif f erent structural conform a tion and dif f erent visous m e dium . The article also developed a kind of silica gel -dishing spring com b ination buf fer , - iii - 北京工业大学工学硕士学位论文 which is sm all and able to of fer big tons with hign dam p .it can be used for a special set. According above dissipation theroy , visous dam p ers. force theoretical form ulas are obtained including the form ulas of thehole-dam p er and clearance-dam p er . it is a set of high precision visous force theoretical and e xpe-riential form ula, in addition , m odified from a great m ount of exper...