Abstract
Construction of bridges span-by-span with Movable Scaffolding Systems (MSSs) is a very efficient and competitive technology. Normally used for spans between 25 and 70m, the technology has allowed reaching longer spans due to technological advances, specifically in bridge construction equipment. Thereby, the use of MSS has become widespread and well-accepted in a large number of locations across the USA and Europe. Nevertheless, despite its extended application, there is no single specific code provision that can explain, control, and give recommendations about all aspects of MSS during its design and usage. On the contrary, the information is spread over several documents. This paper aims at bridging this gap by providing an extensive review of code provisions and recommendations that can be valid for the MSS design. Applicability of these documents is discussed by analysing loads, safety factors, load combinations, limit states, as well as structural analysis and design. After this, a proposal of a design basis for MSS is presented for each aspect mentioned following provisions and recommendations of the considered codes.
Highlights
The Movable Scaffolding Systems (MSSs) are an in-situ full span casting method of concrete bridge decks
This paper has analysed different aspects to be considered in design of MSSs
There are plenty of available code provisions, there is a noticeable lack of information concerning structural MSS design
Summary
The Movable Scaffolding Systems (MSSs) are an in-situ full span casting method of concrete bridge decks. This technique implies that during construction, the bridge superstructure is carried by an external formwork mounted on the launching girders. MSS was used for the first time in 1961 in the construction of the Krahnember Bridge in Germany designed by Hans Wittfoht (Leonhardt, 1984). Since during the 1960s and 1970s, the technology was developing in many aspects and expanded to different countries. In the most recent developments, MSS technology has proved suitable and efficient for in-situ span-by-span deck erection of multi-span viaducts, offering such benefits as safe construction, simple geometric control, reduced material consumption, and a beneficial impact on sustainability (Pacheco et al, 2020)
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