Assessment of Old Railway Bridges Under the Pardis High-Speed Train

There are numerous old arch bridges in Iran that have been used as railway bridges for more than eighty years. In Iran's railway network, there are about 3,700 bridges which all of these have been designed based on service load in that time (low-speed trains) and are still serving for trains at...

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Autores principales:	Peyman Azimi, Mahdi Yazdani
Formato:	article
Lenguaje:	FA
Publicado:	Iranian Society of Structrual Engineering (ISSE) 2021
Materias:	masonry arch bridge finite element modeling geometrical properties of high-speed trains pardis train dynamic assessment Bridge engineering TG1-470 Building construction TH1-9745
Acceso en línea:	https://doaj.org/article/9f36455a132b442a8ced6d0806eab0c9
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spelling	oai:doaj.org-article:9f36455a132b442a8ced6d0806eab0c92021-11-08T15:54:55ZAssessment of Old Railway Bridges Under the Pardis High-Speed Train2476-39772538-261610.22065/jsce.2019.183400.1846https://doaj.org/article/9f36455a132b442a8ced6d0806eab0c92021-07-01T00:00:00Zhttps://www.jsce.ir/article_99201_9920faf3612657c43800711d2824f4d0.pdfhttps://doaj.org/toc/2476-3977https://doaj.org/toc/2538-2616There are numerous old arch bridges in Iran that have been used as railway bridges for more than eighty years. In Iran's railway network, there are about 3,700 bridges which all of these have been designed based on service load in that time (low-speed trains) and are still serving for trains at maximum speed of 100 km/h. Using of high-speed trains has been spread all over the world in the last two decades. In recent years, the use of high-speed trains is necessary in the Iran. It is not possible at all to replace old masonry arch bridges due to field and economic constraints, so it is necessary to evaluate the dynamic behaviour of these bridges under the high-speed trains. To evaluate complex behavior of these bridges, results of field tests are required. Since it is not possible to perform field tests for all arch bridges, these structures should be simulated correctly by computers for structural assessment. The present study investigates two plain concrete arch bridge which are located in kilometer 23 and 24 of the old Tehran-Qom railway. The numerical model of the bridge is established in accordance with detailed geometrical properties of the bridges. The numerical model has been validated based on the existing experimental results. In the model updating procedure, the vertical deflection at the crown under static loading and the movement of the six-axle train by 60 and 80 km/h, as well as the first three modes of the bridges were selected as a calibration criterion. In the second step, different geometrical of Pardis high-speed train are used and totally 13 geometrical models have been detected and investigated. By using the finite element method and the macro-modelling approach, the km-23 and km-24 bridges were simulated and totally 26-time history dynamic analyses have been conducted. Dynamic behaviour of the bridge under moving load model of Pardis trains at speeds of 150km/h have been assessed. Finally, deflection and acceleration responses for all 26 dynamic analyses at the crown of the bridges have been extracted and compared. These analyses are conducted to the aim of finding opportunities and constraints in using railway masonry arch bridges in the Iran as it is necessary to use existing rail lines on the rail network, due to the high cost of the construction of new ones and the need to know the existing structures such as bridges and their properties under the impact of high-speed trains. A realistic prediction of the structure's response helps a rational operation of the bridges in the service, that’s why the correct understanding of the dynamic behaviour of railway bridges is essential. The results of present study indicate that these bridges have good behaviour under high-speed trains.Peyman AzimiMahdi YazdaniIranian Society of Structrual Engineering (ISSE)articlemasonry arch bridgefinite element modelinggeometrical properties of high-speed trainspardis traindynamic assessmentBridge engineeringTG1-470Building constructionTH1-9745FAJournal of Structural and Construction Engineering, Vol 8, Iss 5, Pp 260-278 (2021)
institution	DOAJ
collection	DOAJ
language	FA
topic	masonry arch bridge finite element modeling geometrical properties of high-speed trains pardis train dynamic assessment Bridge engineering TG1-470 Building construction TH1-9745
spellingShingle	masonry arch bridge finite element modeling geometrical properties of high-speed trains pardis train dynamic assessment Bridge engineering TG1-470 Building construction TH1-9745 Peyman Azimi Mahdi Yazdani Assessment of Old Railway Bridges Under the Pardis High-Speed Train
description	There are numerous old arch bridges in Iran that have been used as railway bridges for more than eighty years. In Iran's railway network, there are about 3,700 bridges which all of these have been designed based on service load in that time (low-speed trains) and are still serving for trains at maximum speed of 100 km/h. Using of high-speed trains has been spread all over the world in the last two decades. In recent years, the use of high-speed trains is necessary in the Iran. It is not possible at all to replace old masonry arch bridges due to field and economic constraints, so it is necessary to evaluate the dynamic behaviour of these bridges under the high-speed trains. To evaluate complex behavior of these bridges, results of field tests are required. Since it is not possible to perform field tests for all arch bridges, these structures should be simulated correctly by computers for structural assessment. The present study investigates two plain concrete arch bridge which are located in kilometer 23 and 24 of the old Tehran-Qom railway. The numerical model of the bridge is established in accordance with detailed geometrical properties of the bridges. The numerical model has been validated based on the existing experimental results. In the model updating procedure, the vertical deflection at the crown under static loading and the movement of the six-axle train by 60 and 80 km/h, as well as the first three modes of the bridges were selected as a calibration criterion. In the second step, different geometrical of Pardis high-speed train are used and totally 13 geometrical models have been detected and investigated. By using the finite element method and the macro-modelling approach, the km-23 and km-24 bridges were simulated and totally 26-time history dynamic analyses have been conducted. Dynamic behaviour of the bridge under moving load model of Pardis trains at speeds of 150km/h have been assessed. Finally, deflection and acceleration responses for all 26 dynamic analyses at the crown of the bridges have been extracted and compared. These analyses are conducted to the aim of finding opportunities and constraints in using railway masonry arch bridges in the Iran as it is necessary to use existing rail lines on the rail network, due to the high cost of the construction of new ones and the need to know the existing structures such as bridges and their properties under the impact of high-speed trains. A realistic prediction of the structure's response helps a rational operation of the bridges in the service, that’s why the correct understanding of the dynamic behaviour of railway bridges is essential. The results of present study indicate that these bridges have good behaviour under high-speed trains.
format	article
author	Peyman Azimi Mahdi Yazdani
author_facet	Peyman Azimi Mahdi Yazdani
author_sort	Peyman Azimi
title	Assessment of Old Railway Bridges Under the Pardis High-Speed Train
title_short	Assessment of Old Railway Bridges Under the Pardis High-Speed Train
title_full	Assessment of Old Railway Bridges Under the Pardis High-Speed Train
title_fullStr	Assessment of Old Railway Bridges Under the Pardis High-Speed Train
title_full_unstemmed	Assessment of Old Railway Bridges Under the Pardis High-Speed Train
title_sort	assessment of old railway bridges under the pardis high-speed train
publisher	Iranian Society of Structrual Engineering (ISSE)
publishDate	2021
url	https://doaj.org/article/9f36455a132b442a8ced6d0806eab0c9
work_keys_str_mv	AT peymanazimi assessmentofoldrailwaybridgesunderthepardishighspeedtrain AT mahdiyazdani assessmentofoldrailwaybridgesunderthepardishighspeedtrain
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Assessment of Old Railway Bridges Under the Pardis High-Speed Train

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