Application of lightweight steel-UHPC composite beam in bridge emergency repair

Abstract

This paper mainly introduces the emergency repair process for small- and medium-span bridges. The causes of deterioration were analysed by investigating old bridges. After comparison and selection of schemes, the scheme of beam replacement was confirmed using a lightweight steel ultra-high performance concrete (UHPC) composite beam as the superstructure. The main components of the calculations and the design are introduced in detail. Finally, through the load test of the bridge, it was shown that the lightweight steel-UHPC composite beam had good performance and met the requirements of Highway Level I bearing capacity. The lightweight steel-UHPC composite beam described in this paper has the characteristics of high strength, light weight, fast construction, excellent working performance, and remarkable social and economic benefits. It can be popularised and applied in the emergency repair of small- and medium-span bridges and new bridges.

Keywords

Emergency repair / Lightweight steel-UHPC composite beam / Analysis of deterioration / Differential settlement / Fast construction

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Funding

Ningbo Public Welfare Research Program Projects(2023S178); Science and Technology Innovation 2025 Major Project of Ningbo(202302)