Estimate of Inelastic Excursions in Hysteretic Structures by Wavelet Transform of Acceleration Responses

2006 ◽  
Author(s):  
Yuito Hashimoto ◽  
Arata Masuda ◽  
Akira Sone
Keyword(s):  
Wavelet Transform ◽  
Structural Model ◽  
Plastic Region ◽  
Stationary Wave ◽  
Elastic Region ◽  
Inelastic Behavior ◽  
Restoring Force ◽  
Lead Rubber Bearings ◽  
Hysteretic Characteristics ◽  
Rubber Bearings

In this paper, we present the method to estimate inelastic behavior of structures by wavelet transform. In the presented method, we focus on the singularity, which appears in acceleration responses when the restoring force of structures enters into an elastic region from a plastic region. And we confirm numerically and experimentally that we can estimate the inelastic excursions to the elastic region from the plastic region by performing the wavelet transform on the absolute acceleration response. The experiment is carried out using the five-story structural model installed by lead rubber bearings (LRBs) with hysteretic characteristics of restoring force. The experiment results show that wavelet transform makes it possible to estimate the inelastic excursions, when a non-stationary wave is inputted into the structure.

scholarly journals The seismic isolation of Wanganui Hospital with RoGliders

2008 ◽  
Vol 41 (4) ◽  
pp. 263-265
Author(s):  
W.H. Robinson ◽  
C.R. Gannon
Keyword(s):  
Seismic Isolation ◽  
Seismic Protection ◽  
Restoring Force ◽  
Maximum Displacement ◽  
Lead Rubber Bearings ◽  
Rubber Bearings ◽  
New Buildings ◽  
Horizontal Displacements

Two new buildings at Wanganui Hospital, a peri-operative facility and an acute services block, have just been completed in June 2008 using RoGliders to provide seismic isolation in this earthquake prone region. This is the first application of the RoGlider, an isolator suitable for light structures providing in one compact unit the functions of support, damping and the required restoring force, while providing for a maximum displacement of ± 400 mm. The RoGlider provides for economical seismic protection under conditions not suitable for lead rubber bearings i.e. a combination of light vertical loads and large horizontal displacements.

An Investigation of Adaptive Rubber Bearings

2016 ◽  
Author(s):  
C. S. Tsai ◽  
Hui-Chen Su ◽  
Wen-Chun Huang
Keyword(s):  
Yield Strength ◽  
Lower Yield ◽  
Passive Devices ◽  
Major Benefit ◽  
Lead Rubber Bearings ◽  
Lower Yield Strength ◽  
Multiple Levels ◽  
Materials Used ◽  
Rubber Bearings ◽  
Stiffness And Damping

Proposed in this study are several innovative seismic isolators composed of rubber materials that are called adaptive rubber bearings based on their adaptive characteristics. The materials used in the proposed isolators are free of lead commonly found in lead rubber bearings. The lead material results in a heavy environmental burden as well as lower yield strength and damping due to rising temperature during earthquakes, and thus causes larger displacements than we would expect. The designed mechanisms in the proposed isolators enable these devices to be manufactured relatively easily. They also provide extremely high damping to bearings, which is strongly desired by engineers in practice. The proposed rubber bearings are completely passive devices yet possess adaptive stiffness and adaptive high damping. The change in stiffness and damping is predictable and can be calculated at specifiable and controllable displacement amplitudes. The major benefit of the adaptive characteristics of seismic isolators is that a given system can be optimized separately for multiple performance objects at multiple levels of earthquakes. In this study, mathematical formulations are derived to explain the mechanisms of the proposed devices. Experimental results of high velocity cyclical loadings are also provided to verify the advanced concepts of the proposed devices.

Effects of Heating on the Behavior of Lead-Rubber Bearings. I: Theory

2009 ◽  
Vol 135 (12) ◽  
pp. 1440-1449 ◽  
Author(s):  
Ioannis V. Kalpakidis ◽  
Michael C. Constantinou
Keyword(s):  
Lead Rubber Bearings ◽  
Rubber Bearings

Modeling of Lead Rubber Bearings under Large Cyclic Material Strains

2021 ◽  
Vol 147 (11) ◽  
pp. 04021170
Author(s):  
J. F. Marquez ◽  
G. Mosqueda ◽  
M. K. Kim
Keyword(s):  
Lead Rubber Bearings ◽  
Rubber Bearings

scholarly journals Predicting Maximum and Cumulative Response of A Base-isolated Building Using Pushover Analysis

Buildings ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 91
Author(s):  
Kenji Fujii ◽  
Yoshiyuki Mogi ◽  
Takumi Noguchi
Keyword(s):  
Seismic Design ◽  
Pushover Analysis ◽  
Analysis Method ◽  
Single Degree Of Freedom ◽  
Local Responses ◽  
Single Degree ◽  
Cumulative Response ◽  
Cumulative Strain ◽  
Lead Rubber Bearings ◽  
Rubber Bearings

The evaluation of the maximum and cumulative response is an important issue for the seismic design of new base-isolated buildings. This study predicts the maximum and cumulative response of a 14-story reinforced concrete base-isolated building using a set of pushover analyses. In the proposed pushover analysis method, the maximum and cumulative responses of the first and higher modes are evaluated from the nonlinear analysis of equivalent single-degree-of-freedom (SDOF) models. Then, the maximum local responses are predicted by enveloping the two pushover analysis results by referring to the contribution of the first and higher modal responses, while the cumulative strain energies of the lead-rubber bearings and steel dampers are predicted from the cumulative response of the first mode. The results reveal that the responses predicted by the proposed set of pushover analyses have satisfactory accuracy.

Seismic response of highway viaducts equipped with lead-rubber bearings under low temperature

2020 ◽  
Vol 209 ◽  
pp. 110008
Author(s):  
Pengru Deng ◽  
Zhiping Gan ◽  
Toshiro Hayashikawa ◽  
Takashi Matsumoto
Keyword(s):  
Low Temperature ◽  
Seismic Response ◽  
Lead Rubber Bearings ◽  
Rubber Bearings

scholarly journals Study of Lead Rubber Bearings Operation with Varying Height Buildings at Earthquake

2014 ◽  
Vol 91 ◽  
pp. 48-53 ◽  
Author(s):  
O.V. Mkrtychev ◽  
G.A. Dzhinchvelashvili ◽  
A.A. Bunov
Keyword(s):  
Lead Rubber Bearings ◽  
Rubber Bearings
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