Long Span Bridge Design Treated with UHPC Implementation

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Long Span Bridge Design Treated with UHPC Implementation

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Naveenkumar Swamy1

1MSc Student, Civil Engineering Department, University of Bologna, Bologna, Italy,

Tongji University, Shanghai, China

Abstract – In the last several years great progression has been created in the investigation and development of a brand-new kind of concrete called ultra-high-performance concrete (UHPC). This high-tech material has excellent material attributes as compared to traditional concrete and has the potential to create slender and lighter structures. Nevertheless, the content is still really costly and requires designers to reduce material use to make an economic structure. The application of UHPC is able to enhance the box shaped cross section in a number of ways. Very slender beams could be created by using a higher amount of prestress. Also, wider beams with very slim webs can be made because of the high shear capacity. For this particular master thesis 5 different kinds of UHPC box beams are actually developed. These optimized box beams are actually created for bridges spanning 60m, 80m, 70m, 85m and 90m. The most crucial benefits of these UHPC box beams over box beams made of standard concrete are:

The beams are actually slenderer

The beams are actually wider: o Less beams must be produced, transported and assembled, lessening the amount of time and labor necessary to construct the bridge.

The beams are actually lighter: o the total loading of the bridge is actually reduced by the lower self-weight. o They're easier in order to transport as well as to hoist. o Longer beams up to 90m may be made without exceeding the 170t weight limit for transport by road.

These benefits enable the UHPC box beams to be a fit solution for spans which are way too long for conventional box beam strategies, without having to create an intermediate pier or even to shift to segmented or even cast in situ solutions. Additionally, they are able to change old bridges with a stronger one without having to change the substructure. Consequently, it could be concluded that UHPC beams provide build brand new bridges and replace older bridges with little traffic hindrance.

1.INTRODUCTION

The Increasing demand of highways. Additionally, many existing bridges reach their service life and/or don't have the capability to carry the improved traffic intensities and many of them may have to be replaced or perhaps strengthened. When a new bridge must cross a highway with higher traffic intensity, there's usually a need for a bridge which may be constructed with minimum traffic hindrance. The exact same holds for old bridges that should be changed. It's ideal that these may be replaced with minimum traffic hindrance. By taking away the demand for an intermediate pier the traffic hindrance can be cut down considerably. Nevertheless, at the exact same time the span increases with a significant amount. Therefore, to minimize traffic hindrance, road bridges that can easily span longer distances are actually needed. Furthermore, it's also appealing that when a bridge is actually replaced, the current substructure would still have the ability to withstand the

increased traffic loading. This could just be accomplished if the replacing superstructure is substantially lighter.

1.1 Problem Description1.2 Objectives of Research

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