The new railway hybrid bridge in Dąbrowa Górnicza: innovative concept using new design method and results of load tests

Abstract

The article presents a prototype steel–concrete bridge with the results of trial load tests. In the design of the structure, new approaches were used, the so-called concept of a hybrid cross section. The obtained results were interpreted against the background of theoretical analysis performed and the experience of the behavior of the existing standard bridge structures. The obtained results are to be the starting point for the development of methods of calculating this type of structure, with particular emphasis on the degree of cracking of the concrete part of the structure. The paper is intended to be a starting point for demonstrating that it is possible to calculate longitudinal shear in the fatigue limit state (of steel dowels) differently than in the fully cracked section. Similarly, it is supposed to be a point of discussion on how to perform a global analysis of hybrid systems.

Proposal of concept for global analysis of hybrid beams – numerical investigation

“…In the course of the project, independent "cracked" an "un-cracked" global analysis have been done and conclusions were drawn in support of the theses presented in this article. In particular (and not for the first time -similar conclusions were made in [2]) it was noted that the analysis in the un-cracked state of the support zones allows for easier modeling and design of the bridge slab in the complex stress state in the support zone.…”

“…Bridges using composites dowels have been built in Poland and the EU for over 10 years [1] and the European design rules CEN/TS 1994-1-102 is currently being proposed, introducing the rules for designing both the shear connection and new types of crosssection; so called hybrid section. The first bridge designed in accordance with the hybrid section concept proposed in CEN is the structure presented in [2]. Publication [2] highlights the problems related to global analysis, which have been discussed all the time and so far no consensus has been reached on how global analysis of such objects should be carried out.…”

“…The first bridge designed in accordance with the hybrid section concept proposed in CEN is the structure presented in [2]. Publication [2] highlights the problems related to global analysis, which have been discussed all the time and so far no consensus has been reached on how global analysis of such objects should be carried out. At this point, it is noted that solutions such as those presented in [3] are still perceived as innovative and designed by a small group of engineers with appropriate knowledgethey are niche solutions.…”

“…In a paper [3] a brief overview of composite dowels development [9][10][11] and existing and recently designed hybrid-beam type constructions was presented, and some motivators -mostly economical -for their development were described. Hybrid beams, comparing to standard steel-concrete composite structures, offer significantly less structural steel consumption [1,6,[12][13][14][15], and (depending on the market trends) this is usually the most decisive aspect of economical success of a design. However, design of hybrid beams goes beyond rules and requirements established in the current standards.…”

Comparasion Plastic Behavior of Box Grider Bridge With Multiple Box and Cellular Box Cross Sections

“…The bridge design is based on the Allowable Stress Design (ASD) method, known as the Service Boundary Design (PBL) (Aghayere &Vigil, 2020;Lorenc & Bartoszek, 2023), which aims to address specific service boundary conditions. These conditions encompass various scenarios that could compromise the bridge's functionality and safety during service, including situations where the working stress in bridge components surpasses allowable stress thresholds, potentially leading to steel component yield (Yang & Frangopol, 2020).…”