scholarly journals A MODIFIED BILINEAR HYSTERESIS MODEL AT SMALL STRAINS OF LEAD-RUBBER BEARINGS BASED ON SEISMIC RESPONSE RECORDS

2005 ◽  
Vol 70 (587) ◽  
pp. 85-92
Author(s):  
Satoshi KURITA ◽  
Manabu TOYOSHIMA ◽  
Motojiro MOTOHASHI ◽  
Daisuke CHIBA ◽  
Yoshihiro SUGIMURA
Keyword(s):  
Seismic Response ◽  
Hysteresis Model ◽  
Small Strains ◽  
Lead Rubber Bearings ◽  
Rubber Bearings

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

Development on Rubber Bearings for Sodium-Cooled Fast Reactor: Part 6 — Proposal of New Type of Hysteresis Model for Ultimate Behavior

2017 ◽  
Author(s):  
Tsuyoshi Fukasawa ◽  
Shigeki Okamura ◽  
Tomohiko Yamamoto ◽  
Tomoyoshi Watakabe
Keyword(s):  
Seismic Response ◽  
Hysteresis Loops ◽  
Response Analysis ◽  
Hysteresis Model ◽  
Seismic Response Analysis ◽  
Restoring Force ◽  
Proposed Model ◽  
New Type ◽  
Rubber Bearings ◽  
Hysteresis Characteristics

This paper describes a new type of hysteresis model applied for seismic response analysis, which provides restoring force characteristics containing various types of hysteresis loops generated by calculating differential equations, based on static breaking tests regarding thick rubber bearings. In order to reduce residual risk, there is increasing necessity to accurately predict seismic response against both design-basis ground motion and ground motion exceeding design-basis. This process of seismic response prediction is called seismic Probabilistic Risk Assessment (PRA). In general, a restoring force of rubber bearing under large deformation due to a major earthquake has strong non-linear characteristics containing the hysteresis loops. To improve the accuracy of seismic response predictions up to the ultimate behavior in PRA, a new hysteresis model to be applicable up to the breaking point in horizontal and vertical directions is proposed by the authors. The features of the proposed hysteresis model are as follows: (1) The hysteresis characteristics obtained by the proposed model have smooth curves as substantive hysteresis loops measured in breaking tests. (2) The various types of hysteresis characteristics can be captured efficiently as initial value problems since the proposed model, consisting of differential equations, directly allows the skeleton function, and unaffected by hysteresis law such as Masing law. This paper indicates applicability of the proposed hysteresis model to seismic response analysis through comparison of results of the static breaking test with results of analytical, and also describes the breaking mode obtained by the seismic response analysis.

Research on Isolated Strengthening of Erose School Buildings

2011 ◽  
Vol 94-96 ◽  
pp. 1298-1303
Author(s):  
Xi Sen Fan ◽  
Shu Zhen Ren
Keyword(s):  
Seismic Response ◽  
Masonry Structure ◽  
School Buildings ◽  
Isolation System ◽  
Torsional Response ◽  
Rubber Bearing ◽  
Lead Rubber Bearing ◽  
Lead Rubber Bearings ◽  
Rubber Bearings ◽  
Strengthening Technique

The aseismatic strengthening technique for masonry structure was researched in this paper. The seismic response of a L-type school building with and without isolation system were computed by using software SAP2000. The isolation system were made up of lead rubber bearings or combined Isolation system. The results showed that base-isolated strengthening can reduce not only the translational response but also the torsional response with earthquake. The combined Isolation system was more effetive in decreasing translational response than the lead rubber bearing, but inferior to in decreasing torsion response.

Research on the Effect of Combined Seismic Isolation System

2012 ◽  
Vol 446-449 ◽  
pp. 3299-3303
Author(s):  
Xi Sen Fan ◽  
Ting Lei Tian
Keyword(s):  
Seismic Response ◽  
Seismic Isolation ◽  
Base Isolation ◽  
Seismic Responses ◽  
Combined System ◽  
Isolation System ◽  
Lead Rubber Bearings ◽  
Base Isolation System ◽  
Rubber Bearings ◽  
The Relationship

The isolation system between the upper structure and the foundation could reduce the seismic response of the former. A system combined of sliding and lead rubber bearings (LRB) is more effective in seismic isolation than using the later alone. In this research, the seismic responses of a building which was set with LRB and a combined system (the proportions between the sliding and LRB were 1/6, 1/4 and 1/3) respectively were analyzed and compared to that of the building without base isolation system to investigate the effect of seismic isolation. The relationship between isolation coefficient and the proportion of bearings was studied. The results show that the combined system could reduce the seismic response of structure, and it is more effective in seismic isolation if the leading bearing is relatively more.

scholarly journals The Effects of Using Different Seismic Bearing on the Behavior and Seismic Response of High-Rise Building

2017 ◽  
Vol 3 (3) ◽  
pp. 160-171 ◽  
Author(s):  
Saman Mansouri ◽  
Amin Nazari
Keyword(s):  
Seismic Response ◽  
Linear Time ◽  
Time History ◽  
Bending Moment ◽  
Vertical Axis ◽  
History Analysis ◽  
Lead Rubber Bearings ◽  
Rc Building ◽  
Rubber Bearings ◽  
Seismic Response Of Buildings

The effects of using different seismic bearings were investigated to reduce the seismic response of buildings by assuming the vulnerability of 20-story regular RC building in this paper. The method of this study was that the studied building was studied in three different models in terms of its connection to the foundation. In the first model, the structures were placed on the rigid bearing and in the second and third models; lead-rubber bearings and friction pendulum bearings were placed at the counter between the structure and foundation, respectively. Then, the dynamic analysis was used to assess the behaviour and seismic response of the mentioned models. The results of the study showed that the structures in the first model functioned like cantilever column that would become uniaxial and biaxial bending under the effects of earthquake around the vertical axis of structure. Due to the tensile (tension) weakness in concrete, seismic loads caused major cracks in the tension part of the structures according to the place of the neutral axis that could lead to the collapse of structure. In addition, the use of mentioned seismic bearings under the earthquake caused the structure like a semi-rigid box slid on this equipment that reduced the structure's stiffness and increased the period of the structure in comparison with the first model. Using the studied seismic bearings caused the displacement of the roof of the first and twentieth stories of the structure become approximately equal and prevented the creation of the bending moment in the first model. The results of non-linear time history analysis showed that using the studied seismic bearings caused the response of the structure reduced significantly when the structure was placed on rigid bearings. It could be very valuable regarding the limitation of the capacity of the structure's members.

scholarly journals Seismic Response Reduction of Megaframe with Vibration Control Substructure

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Jun-Qi Huang ◽  
Xun Chong ◽  
Qing Jiang ◽  
Xian-Guo Ye ◽  
Han-Qin Wang
Keyword(s):  
Vibration Control ◽  
Seismic Response ◽  
Element Model ◽  
Viscous Dampers ◽  
Lead Rubber Bearings ◽  
Standard Value ◽  
Rubber Bearings ◽  
Rare Earthquake ◽  
Tuning Frequency ◽  
Two Parameters

Megaframe with vibration control substructure (MFVCS) is a tuned mass damper system, which converts the substructures into the tuned mass. In this study, a kind of MFVCS using both lead-rubber bearings and viscous dampers to connect the vibration control substructure with the megaframe was proposed. Then, based on a validated finite element model, a parametric analysis was conducted to study the effect of two parameters, the tuning frequency (i.e., the frequency of the substructure) and the damping provided by the lead-rubber bearings and viscous dampers on the seismic response reduction of the MFVCS under both frequent and rare earthquakes (i.e., probability of exceedance of 63% and 2% in 50 years, resp.). Furthermore, the optimized values of these two parameters were achieved. The results indicated that (1) the proposed MFVCS could provide a considerable seismic response reduction under frequent earthquake and showed a strong robustness; (2) the optimized values of the frequency ratio (ratio of tuning frequency to the megaframe’s natural frequency) and damping scale factor (ratio between the investigated damping and a standard value) were 0.96 and 1.0, respectively; and (3) the seismic response reduction of the MFVCS under rare earthquake was lower than that under frequent earthquake.

Sign in / Sign up

Export Citation Format

Share Document