Bridge construction cost saving from using LRB (Lead Rubber Bearing) in the area prone to earthquake, Kenteng bridge case study

¹ Young Functional Official of Ministry of Public Works and Housing, Highway General Directorate, Bridge Directorate, Jl. Pattimura No 20 Lt 6, South Jakarta, Indonesia
² Middle Functional Official of Ministry of Public Works and Housing, Highway General Directorate, Bridge Directorate, Jl. Pattimura No 20 Lt 6, South Jakarta, Indonesia
³ Head of Bridge Directorate of Ministry of Public Works and Housing, Highway General Directorate, Bridge Directorate, Jl. Pattimura No 20 Lt 6, South Jakarta, Indonesia

^* Corresponding author: ariono.dhanis@gmail.com

Abstract

There are many ways to reduce the earthquake force excited in the bridge structure, such as the use of Lead Rubber Bearing, Sliding Isolation Pendulum, and Damper/Lock Up Device. The concern that described in this paper is Lead Rubber Bearing support to damp earthquake thrust above the pier. The declared by the manufacturer guarantee is that the LRB can weaken the shock for about 30%. The analysis executed here is a response spectrum analysis calculating the natural frequency of the bridge. The contractual cost of the structure (with LRB structure) with the non-LRB structure were compared. We did not compare in terms of reinforced concrete volume reduction because the price of the LRB each and the price of the concrete with rebar per m3 are different. From the analysis, it is shown that without LRB, the price of the bridge will be increased at 19% from the original contractual price (before tax) or 16% saving. From this point, it is important to use LRB in our earthquake-prone area as the conclusion.