List of Articles Lead rubber bearing

• Open Access Article
  • Abstract Page
  • Full-Text
  
  1 - Influence of the Isolator Characteristics on the Response of the Isolated Buildings in the Near-FaultEarthquakes
  Beytollah Taromi Kiarash Nasserasadi Asghar Vatani Oskouei
  Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  2 - Investigation of the Base Isolation in Improving the Behavior of Steel Buildings subjected to Earthquakes applied with Different Angles
  Kourosh Mehdizadeh Seyede Vahide Hashemi Abbasali Sadeghi gholamreza shobeyrii
  Seismic isolation is an earthquake resistant design method based on reducing seismic demand instead of increasing structural capacity. With regard to the multiplicity of studies conducted to investigate the seismic behaviour of isolators under the effect of earthquakes, More

  Seismic isolation is an earthquake resistant design method based on reducing seismic demand instead of increasing structural capacity. With regard to the multiplicity of studies conducted to investigate the seismic behaviour of isolators under the effect of earthquakes, in this study, role of the base isolator in improving the behaviour of steel structures under the influence of earthquakes with different angles was investigated along with considering the effect of structural height and plan shape. In the present study, steel structures with and without Lead Rubber Bearing (LRB) base isolator are modelled in 3D with 8 and 12 stories and square and rectangular plans. The seismic performance of these buildings has been reviewed and compared according to 4 pairs of near-fault earthquake records (8 records) with angles (0°, 30°, 60° and 90°) based on FEMA P695 instruction under the nonlinear dynamic time history analyses in SAP2000 software. The results showed that steel structures at angles of 60 and 90º had larger and more critical seismic responses. Based on results, the effect of seismic isolator on reducing the seismic responses of buildings at angles of 0 and 30º was low, while at the angles of 60 and 90º was more significant. The use of separators had a great impact on improving the performance and seismic responses of structures. The results also presented that in most records, the height of the structure was more effective than the plan shape regarding the seismic responses of the isolated structures. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  3 - Effect of Tuned Mass Damper with Various Mass Fractions on the Seismic Performance of Isolated Reinforced Concrete Structures
  mehdi kouhdaragh
  Dampers and isolators are energy dissipating devices to control and reduce the seismic responses of structures under strong earthquakes. One of the most widely used of these devices is a special type of damper called TMD mass dampers and LRB lead core separators. Tuned More

  Dampers and isolators are energy dissipating devices to control and reduce the seismic responses of structures under strong earthquakes. One of the most widely used of these devices is a special type of damper called TMD mass dampers and LRB lead core separators. Tuned Mass dampers (TMD) and Lead Rubber Bearings (LRB) are of the most widely used types of these devices. The scientific study of the seismic characteristics and nonlinear behavior of structural systems equipped with this type of dampers and isolators can significantly help to understand the behavior of these systems against the lateral forces imposed by strong earthquakes. In this research, a 12-story concrete structure with mass damper with various mass fractions, without isolator and with lead core isolator is designed. Then, applying time history analysis in SAP2000 software in isolated states without damper and with damper with different mass fractions, the responses of the structures against the mentioned earthquakes are obtained. The results of the analysis presented that the presence of mass damper is very effective due to the increased displacement in the isolated level. This effect is increased by increasing the mass fraction of the damper. The seismic isolator, on the other hand, can reduce the relative displacements of stories by 20 to 30% on average. The mass damper controls the large displacements of the isolator. The results in the studied structure revealed that in order to utilize the maximum capabilities of the isolator, it should be combined with mass damper. Manuscript profile