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Field Performance of a Composite Log-Concrete Bridge

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Abstract:

In Brazil, composite log-concrete bridges are considered a viable alternative for municipal and rural use, mainly because of their low construction and maintenance costs and their high strength and stiffness. These bridges consist of a thin concrete slab over round timber beams. Materials are thus used to their best abilities, with timber under tension and concrete under compression. The two components are connected by glued steel bars. This paper presents the field performance of a composite log-concrete bridge constructed in December 2004 on the grounds of the University of São Paulo. This two-lane bridge is 12 m long, 10 m wide, and has a skew of 15º. The load tests consisted of positioning fully loaded, three-axle trucks on the bridge and measuring the resulting deflections at a series of points along a transverse cross section at mid-span. In addition, an analytical assessment was made, using computer modeling to predict the response of the bridge. The field tests indicated that the composite log-concrete bridge performs adequately without structural deficiencies.

Keywords: BRIDGE DECK ANALYSIS; COMPOSITE TIMBER– CONCRETE BRIDGE; FIELD PERFORMANCE; FINITE ELEMENT; LOAD TEST; ORTHOTROPIC PLATE ANALYSIS; SHEAR CONNECTOR

Document Type: Case Report

DOI: http://dx.doi.org/10.2749/101686608783726786

Publication date: February 1, 2008

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    Structural Engineering International (SEI), the quarterly Journal of IABSE, published since 1991, is the leading international journal of structural engineering dealing with all types of structures and materials. SEI offers its readers a unique blend of short profiles on recent structures, and longer, in-depth technical articles on research, development, design, construction and maintenance. Articles are written by practicing engineers and academia from around the world and reflect the high standards of IABSE. IABSE Peer Review stamps are given to papers that have passed through a highly selective review process and demonstrate a significant contribution to the state of structural engineering knowledge.To recognise contributions of the highest quality, an Outstanding Paper Award is presented each year.

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