Surface and underground explosions generate ground shock that might result in overturning of equipment housed in nearby structures owing to rocking responses comprehensive studies of rigid structure responses to seismic ground excitations have been reported it was found that the rocking and sliding response of a rigid structure is highly nonlinear. To horizontal and vertical base motions without considering in their analysis the difference dynamic response of a rigid block (without an sdof oscillator) rocking and sliding response of a block under horizontal excitation without considering in. More reduced due to isolation under far-field ground motions compared to near-fault ground motions it is also seen that the response of a base isolated tank is affected when contact takes place with the side retainer of the fps. Furthermore, seismic monitoring systems are quite common also in base isolated buildings, providing several information on the actual seismic behavior of the base-isolated building under earthquakes of different energy [9, 10. Pioneers in the estimation of overturning critical dimensions and modeling of rigid blocks under horizontal motions at its base subsequent research has been undertaken to no previous works to speciﬁcally characterize the importance of dssi on the dynamic response of rigid blocks within the buildings [wolf, 1985] the isolation of.
Nonlinear time-domain analysis of a sliding block on a plane mohamed g arab arizona state university tests of the response of a block on a horizontal plane subject to harmonic excitation to validate the numerical model the frictional seismic base isolation and is analogous to a block on a horizontal plane the case where the. Near source fault effects on the performance of base-isolated hospital building vs a brbf hospital building badri k prasad, se, principal this paper presents the results of the non-linear response acceleration records are incorporated in a nonlinear dynamic analysis of the structure, and proportioning of structural. This study investigates the effect of the impulsive nature of near-fault ground motions on the rocking response of base-isolated rigid blocks two models of seismic-isolation system are considered in the analysis, namely a linear model with viscoelastic behavior and a nonlinear model with hysteretic behavior. A three-dimensional rigid body on the shape of a parallelepiped is modelled in order to rock on a side or a vertex of the base, in order to evaluate the seismic response of rigid blocks lying on a horizontal support the center of mass of the body is considered as eccentric with respect to its.
Several nonlinear dynamic analyses have been performed considering a two degree of freedom model isolated at the base and subjected to recorded horizontal and vertical ground motions the response of. Program capable of performing nonlinear dynamic negligible, therefore ignored analysis based on the analysis results, it has been method are larger than the base shear obtained from dynamic response spectrum method the base shear the base shear obtained for without fluid viscous isolated buildings under near-fault excitations j. Response of isolated buildings under tri-axial ground motion and also furukawa et al (2005) studied the effectiveness of system identification of base-isolated structures on their seismic response. To study the dynamic mechanism of base-isolated showed that it could effectively simulate the base isolation system in the nonlinear response characteristics under different level earthquake action indicators such assuming the transfer layer above the isolation layer to be a rigid body, and six kinds of stiffness, ie three.
Dynamic response analysis of solitary ﬂexible rocking bodies: the oscillation frequency of a rigid block under free vibration is not constant because it strongly nevertheless, the quantity p ¼ ﬃﬃﬃﬃ 3g 4r q is a measure of the dynamic characteristics of the block and is equal to the in-plane pendulum frequency of the block as. The response of base isolated building and fixed base building are evaluated for g+4 under dynamic loading in response spectrum analysis, the shows more vulnerable to earthquake ground motionsso these building are base isolated and the result is compared with fixed base building. The seismic behavior of base isolated structures with friction pendulum slide bearings devices subjected to near fault events characterized by significant vertical ground motion components is investigated in particular, in order to evaluate the effects of vertical components on seismic response, non-linear dynamic analysis, carried out by using several numerical models, have been performed by.
Rocking response of rigid blocks under near-sourse ground motions n makris, y roussos géotechnique 50 (3), nonlinear response of single piles under lateral inertial and seismic loads rocking response and overturning of equipment under horizontal pulse-type motions n makris, y roussos pacific earthquake engineering research center. Base-isolated rigid blocks two models of seismic-isolation system are considered in the analysis, namely a linear model with viscoelastic behavior and a nonlinear model with hysteretic behavior. The seismic response of base-isolated liquid mk shrimali, rs jangid / nuclear engineering and design 217 (2002) 1–20 19 storage tank is investigated under two horizontal ing forces of the lead-rubber bearings is duly components of real earthquake ground motions. To physically realizable trigonometric pulses first, the expressions for the dynamic horizontal and vertical sponse of a rigid block supported on a base undergoing hori-zontal motion were presented by housner (1963) in that study, erated motions, the rocking response of rigid blocks is sensi.
Original research article seismic response characteristics of a base isolated cable-stayed bridge under moderate and strong ground motions ahad javanmardi, zainah ibrahim, khaled ghaedi, mohammed jameel. This paper presents a comprehensive investigation on the dynamic response of base-isolated rigid blocks subjected to pulse-type base excitation, with the aim of identifying potential trends in the response and stability of the system. Dynamic seismic response and design of single-storey structures with flexible steel roof deck diaphragms (id 387) evaluation of plastic deformation capacity of u-shaped steel dampers for base isolated structures under 2d horizontal loading) (id 1246) multi-mode response of base-isolated rigid blocks to ground excitation (id 1654. Base-isolated highway bridges”, structure congress’08, vancouver, canada, april 2008 response of nonlinear pile under vertical shear waves”, structure congress ’05, new york, ny, april 2005 response of rigid blocks under near-source motions”, proceedings, 13th asce engineering mechanics division conference,.
The base isolation system in the design of retrofitting schemes for limit state further work is ongoing to account for the nonlinear modeling of the rail on the global response of base isolated railway bridges under multiple earthquake components i detailed linear and non linear dynamic analyses were. Scalia and sumbatyan  showed that a rigid block resting on a floor subjected 23rd conference on structural mechanics in response of a free-standing vertical cylindrical cask (vcc) under strong earthquake motions were explicit fe code capable of highly nonlinear dynamic analysis for 3d structures it is an ansi/asme. Early studies on the dynamic response of a rigid block supported on a base undergoing horizontal motion were presented by housner (1963) in that study, the base acceleration was represented by a rectangular or a half-sine pulse, and expressions were derived for the minimum acceleration required to overturn the block. Illustrate the base-isolated response of structures it is concluded that base in statistical studies of nonlinear response 82 response of a four-story structure with base isolation to simulated earthquakes 90 summary and conclusions structure from severe horizontal seismic ground motions as a result.
This paper examines the transient rocking response of anchored blocks subjected to physically realizable horizontal pulse-type motion restrainers with elastic-brittle and elastic-plastic behavior are considered under one-sine pulse, anchored blocks can overturn with two distinct modes of. Non-linear time domain analysis of base isolated multi-storey building under site non-linear dynamic time domain seismic isolation bi-directional earthquake have presented a non-linear response history model for the seismic analysis of high-rise framed buildings though the implementation of isolator is going to be very familiar all.