ENGLISH PRESENTASION

• ARIF ARDIANSAH
• TEGUH DWI JULIANTO
• WAWAN SUTIYAWAN

SEISMIC RESPONSE OF BUILDING BASE ISOLATED WITH FILLED RUBBER BEARINGS UNDER EARTHQUAKES OF DIFFERENT CHARACTERISTICS

natural rubber bearing has often been considered suitable because of its durability and easier fabrication

The base isolation system consists in introducing low stiffness bearings and damper between foundation and structure

METHOD OF ANALYSIS OF BASE ISOLATED BUILDING

The time history analysis of the base isolated building is carried out using the computer program 3D-BASISTABS. A full three-dimensional representation of the structure is used in time history analysis of the base isolated buildings. The isolation system is modelled as a bilinear hysteretic element. The details of method of analysis are described by Reinhorn et al. (1994). Following assumptions are made for the analysis of base isolated building:

• The superstructure is elastic at all time and the non-linear behaviour is restricted in         isolators only.
• All frame substructures are connected at each floor level by a diaphragm, which is           infinitely rigid in its own plane.
• Each floor has three degrees of freedom (two translations and one rotation) attached to the centre of mass of each floor. The isolation devices are rigid in the vertical direction and each has negligible torsion resistance.
• Effect of infilled walls on stiffness of the structure is negligible. These are considered in computation of mass only

CONCLUSIONS

Filled rubber bearings are suitable for ground motions having high dominating frequencies but is not effective for ground motions whose dominant frequencies are close to natural frequency of base isolated structure. The fundamental period for a bearing is unique for given bearing parameters but the damping is found to be dependent upon the characteristics of input ground motion also. Yield displacement can be used as an important parameter for controlling damping in order to achieve desired base displacement.

5W1H

1.            what program used in basic analisis menthod isolated building ?
-              isolated building carried out using the compoter program 3D-Basistab
2.            who is running the program method analisis of base isolated building ?
-              Reinhorth A.T
3.            when the plate base building sistem analyzed
-              in 1994
4.            why natural rubber bearing are often used in building structure
-              because of its durability and easier fabrication
5.            how to order the building resistence to earthquake
-              by adding a natural rubber beetwen the foundation and structure

PASIVE & AKTIF

+ Substructures are connected at each floor level by a diaphragm

-  Diaphgram is coonected with structure at each floor level

VERBAL & NOMINAL

+ For protecting important building

+ Seismic base isolation is now an accepted practice

-          Two translations and one rotation

-          For low to moderate height buildings

TENSES

PAST TENSES

Each floor has theree degrees of freedom

Earlier thr elastomeric bearing were made of natural rubber.

PRESENT TENSES

Seismic base isolated is now an accepted practice

Filled rubber bearings are suitable for ground motions having high dominating frequencies

THANK YOU