Lead Rubber Bearing Design Example

Modeling of rubber and lead passive control bearings for seismic analysis.

Lead rubber bearing design example. Steel laminated rubber bearings have advantages over the lead plug rubber bearings in that the later induce higher modes response 2. Bearing is one of the important components of bridges. Damping β 0 05 5 used for plain rubber bearings 28. Design example for a high damping rubber bearing design example for a lead plug bearing.

Bulk modulus e 1 5 typical value for neutral rubber 27. It is a collection of structural elements which should substantially decouple a superstructure from its substructure that is in turn resting on the shaking ground thus protecting a building or non building structure s integrity. A ucl civil engineering student workshop about earthquake engineering. This paper presents the design methodology of lead rubber bearing used for seismic isolation of bridges.

Elastic modulus e 0 00135 shear modulus of rubber table 5 4 26. Section applications provides a few more examples of lead rubber bearing applications in buildings bridges and structure retrofit. Furthermore base isolation is designed for hard soil not soft. Lead rubber bearings were developed as base isolators in the.

Re centring dissipation sum lrbs are consisting of a standard elastomeric laminated rubber bearing. Lrb s 700 203 150 lead rubber bearing diameter 700 mm made of rubber com pound with g 0 4 mpa with rubber layers having a total thick ness of 203 mm and a lead core of diameter 150 mm. For the total thickness of the rubber layers in millimeters and the third represents the diameter of the lead core in millimeters. The design and characteristics of maurer lrbs necessary energy dissipation or damping generally between 125 and 200.

Instead of using traditional bearings like ptfe pot bearing lrb is found to be effective in high seismic region and it is used in many developed countries. Section lead rubber bearing properties and structural design provides a more detailed description of the properties of lead rubber bearings along with their significance in structural design. The rubber compound can be of natural rubber or chloroprene rubber while any standard din. Teflon co efficient of friction µ 0 1 use high velocity for design 2.

At present more than 2000 structures buildings and bridges in the world s seismically prone areas usa japan italy and new zealand have been installed with hdnr and lead plug bearings. How are base isolators constructed. Seismic base isolation also known as base isolation or base isolation system is one of the most popular means of protecting a structure against earthquake forces.