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

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

Studia Geotechnica et Mechanica

Volume 45 (2023): Issue 2 (June 2023)

By: Wojciech Lorenc and Błażej Bartoszek

Open Access

|Mar 2023

Figures & Tables

Dąbrowa bridge (picture by Nowak MOSTY).

The idea of external reinforcement by SSF Ingenieure applied in the trough girders (both in the longitudinal and transversal directions of the slab for railway bridges) in the bridge located next to Spergau [9, 1] (picture by Guenter Seidl).

The main differences between 13 m span bridge next to Spergau by “SSF Ingenieure” design office and 23 m bridge in Dąbrowa Górnicza by “FASYS Mosty” design office (reinforced concrete slab and enlarged height of webs of T-sections): a) bridge by SSF using external reinforcement, b) bridge in Dąbrowa Górnicza using general composite section.

Distribution of longitudinal shear in a combined general composite section [3].

General view of the bridge (picture by Nowak Mosty).

Reinforcing bars in cross section [57].

Upper reinforcement in slab [57].

Bottom reinforcement in slab [57].

Shear reinforcement of hybrid girders [57].

Steel T-sections produced in Luxembourg (picture: ArcelorMittal).

Steel T-sections on site next to scaffolding prepared for in situ slab (picture by Nowak Mosty).

Steel structure after welding (picture by Nowak Mosty): main elements and transversal elements at the edge of slab.

The geometry of the steel T-sections above the pillar [57].

T-sections and reinforcement of bottom part of the superstructure (main stirrups crossing concrete dowels are still missing at this stage, compare Fig. 9).

The general view of slab reinforcement.

Reinforcing bars in the upper part of the web girders above the pillar [57].

Possible longitudinal shear flow transfers: only via CDs (I) on the left and via CD (I) plus PBLs (II) on the right.

Implementation of the hybrid section concept (double composite) in the design of the bridge.

FEM models of the bridge structure made by external consulting [10]: a) mixed shell + beam model with shell elements standing for concrete parts and beam elements standing for structural steel parts; b) beam model using cracked steel–concrete sections.

Scheme of the locomotive SM31.

Optical fibers (light wires) on concrete and steel.

Exemplary deformation (linear analysis) of the finite element model from Fig. 19 under load 80 kN/m on the left span, applied as uniformly distributed to the slab in kPa [10].

Load scheme and localization of measurements points.

Main girder deflection of points no. D1-1 and D1-2 for models M40 CR and M40 UCR.

Main girder deflection of points no. D2-1 and D2-2 for models M40 CR and M40 UCR.

Main girder deflection of points no. D1-1 and D1-2 for models S40–S60 (LINE stands for linear, NONL stands for nonlinear material analysis).

Main girder deflection of points no. D2-1 and D2-2 for models S40–S60.

Stress in steel section for optical fibers and for the models M40 UCR/CR.

Stress in steel section for optical fibers and for the models S40–S60.

Comparison of dynamic factors for different FE models and the test load results.

Strain in optical fibers along the span.

General view of the structure during test. L1 – light wire on steel flange, L2 – light wire on concrete web, E – measuring equipment under the bridge (displacements), C – car with computer for computing light wire recordings.

Dynamic factors for Midas models, PN-EN 1991-2, and test values_

	Speed	Dynamic factors						Units
Model no.	-		M40 UCR	M40 CR	6.4.5.2	D1	D2	-
Maintenance	-	Standard				-	-	-
Span length	L_Φ	26.85				-	-	m
Frequency	n₀		4.90	3.76	-	5.43		Hz
ϕ	10		1.01	1.02	1.16	1.00	1.00	-
	20		1.03	1.03	1.16	1.01	1.00
	30		1.04	1.05	1.16	1.00	1.00
	40		1.06	1.06	1.16	1.02	1.02
	50		1.07	1.08	1.16	1.01	1.01
	60		1.09	1.10	1.16	1.03	1.03
	70		1.10	1.12	1.16	1.02	1.02
	80		1.12	1.13	1.16	-	-
	90		1.13	1.15	1.16	1.06	1.03
	100		1.14	1.17	1.16	-	-
	110		1.16	1.19	1.16	-	-
	120		1.17	1.21	1.16	1.08	1.06

Dynamic factors for SOFiSTiK models_

	Speed		Dynamic factors								Units
Model no.	-		S00	S10	S20	S30	S40	S50	S60	S70	-
Maintenance	-		Standard								-
Span length	L_Φ		26.85								m
Frequency	n₀		4.83	4.45	4.68	4.70	4.57	4.83	4.72	4.71	Hz
ϕ	10	2.78	1.02	1.01	1.01	1.01	1.01	1.01	1.01	1.01	-
	20	5.56	1.03	1.03	1.03	1.03	1.03	1.03	1.03	1.03
	30	8.33	1.04	1.04	1.04	1.04	1.04	1.04	1.04	1.04
	40	11.11	1.06	1.06	1.06	1.06	1.06	1.06	1.06	1.06
	50	13.89	1.07	1.07	1.07	1.07	1.07	1.07	1.07	1.07
	60	16.67	1.09	1.09	1.09	1.09	1.09	1.09	1.09	1.09
	70	19.44	1.10	1.11	1.10	1.10	1.11	1.10	1.10	1.10
	80	22.22	1.12	1.12	1.12	1.12	1.12	1.12	1.12	1.12
	90	25.00	1.13	1.14	1.13	1.13	1.14	1.13	1.13	1.13
	100	27.78	1.15	1.15	1.15	1.15	1.15	1.15	1.15	1.15
	110	30.56	1.16	1.17	1.16	1.16	1.16	1.16	1.16	1.16
	120	33.33	1.17	1.18	1.18	1.18	1.18	1.17	1.18	1.18
	Speed		Dynamic factors								Units

DOI: https://doi.org/10.2478/sgem-2023-0002 | Journal eISSN: 2083-831X | Journal ISSN: 0137-6365

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Language: English

Page range: 89 - 111

Submitted on: Aug 31, 2022

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Accepted on: Nov 25, 2022

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Published on: Mar 9, 2023

Published by: Wroclaw University of Science and Technology

In partnership with: Paradigm Publishing Services

Publication frequency: 4 issues per year

Keywords:

hybrid steel-concrete section,

composite dowels,

Related subjects:

Geosciences, other,

Materials sciences,

Porous materials,

Mechanics and fluid dynamics

© 2023 Wojciech Lorenc, Błażej Bartoszek, published by Wroclaw University of Science and Technology
This work is licensed under the Creative Commons Attribution 4.0 License.

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