A mechanism-based assessment framework for masonry arch bridges under scour-induced support rotation

2021 ◽  
pp. 136943322110093
Author(s):  
Jofin George ◽  
Arun Menon
Keyword(s):  
Fragility Curves ◽  
Limit State ◽  
Structural Effect ◽  
Assessment Framework ◽  
Analysis Framework ◽  
Sand Mining ◽  
Structural Effects ◽  
Masonry Arch ◽  
Collapse Mechanisms ◽  
Arch Bridges

Increase in the frequency of flash floods owed to climate change, excessive sand mining, and urbanisation of watersheds has accelerated the need to quantify the structural effect of scour-induced structural damages in masonry arch bridges. The structural effects of scour-induced rotation are unaddressed in literature. In this context, a mechanism-based framework based on limit state principles is developed for masonry arch bridges subjected to scour-induced rotation. Critical collapse mechanisms caused by scour-induced rotation are identified, and analysis framework is developed using rigid-body kinematics. The spectrum of bridges under consideration is classified into subsets, and an assessment scheme is developed using fragility curves as a function of scouring location as well as bridge typology.

FEM/DEM Approach for the Analysis of Masonry Arch Bridges

2016 ◽  
pp. 367-392 ◽  
Author(s):  
Emanuele Reccia ◽  
Antonella Cecchi ◽  
Gabriele Milani
Keyword(s):  
Elastic Strain ◽  
Limit State ◽  
Numerical Approach ◽  
State Behavior ◽  
Masonry Arch ◽  
Preliminary Validation ◽  
Load Carrying ◽  
Arch Bridges ◽  
Embedded Crack ◽  
External Loads

The problem of masonry arch bridges load carrying capacity is studied by means of a coupled FEM/DEM 2D approach. The numerical model relies into a triangular discretization of the domain with embedded crack elements that activate whenever the peak strength is reached. The proposed approach can be regarded as a combination between Finite Elements allowing for the reproduction of elastic strain into continuum and DEM, suitable to model frictional cohesive behavior exhibited by masonry structures even at very low levels of external loads. The aforementioned numerical approach is applied to masonry arch bridges interacting with infill. A preliminary validation of the procedure is addressed for the prediction of the masonry arches limit state behavior where the stones are supposed infinite resistant and plastic hinges can occur exclusively on mortar joints, modeled as cohesive frictional interfaces. The sensitivity of the infill role varying mechanical properties of the infill is extensively discussed.

Traffic loads on medium and long span bridges

1984 ◽  
Vol 11 (3) ◽  
pp. 556-573 ◽  
Author(s):  
D. J. Harman ◽  
A. G. Davenport ◽  
W. S. S. Wong
Keyword(s):  
Limit State ◽  
Structural Effect ◽  
Reference Period ◽  
Structural Effects ◽  
Highway Traffic ◽  
Design Code ◽  
Long Span Bridges ◽  
Long Span ◽  
Code Calibration ◽  
Consistent Manner

A procedure is described for calculating two statistics, the mean and the coefficient of variation, for largest live load effects in a bridge structure caused by highway traffic during a reference period. These statistics are pertinent in the selection of highway live loads and calibration of a statistically based design code. The reference period depends on the limit state being calibrated.Using weights and dimensions of trucks from a 1982 survey in Ontario, congested traffic moving through one bridge length is repeatedly simulated for various “truck densities.” Herein truck density is the number of trucks on a length of highway divided by the maximum number that could occupy the length. When simulating traffic of one density crossing one influence line, the largest structural effect per traffic move has a frequency distribution that, with reasonable accuracy, is idealized as Gaussian.Observed multiple truck presence is modelled by a modified Poisson distribution that has three parameters. For one set of these traffic parameters, mean largest structural effects are shown to vary in a consistent manner with truck density, truck volume, and one parameter characterizing the tributary area of the effect. Based on these observations, more concise procedures for simulation and calculation are recommended. Key words: statistics, probability, truck survey, bridge loads, structural effects, bridge design, code calibration.

scholarly journals CAPACITY ASSESSMENT OF ANCIENT MASONRY ARCH BRIDGE: A CASE STUDY

2020 ◽  
Vol 7 (2) ◽  
Author(s):  
Jigme Dorji ◽  
Tatheer Zahra ◽  
David P. Thambiratnam
Keyword(s):  
Limit State ◽  
Capacity Assessment ◽  
Analysis Method ◽  
Masonry Arch ◽  
Railway Bridges ◽  
Margin Of Safety ◽  
Arch Bridges ◽  
Masonry Arch Bridge ◽  
Current Operating

Most masonry arch railway bridges in the world are servicing the communities well beyond their intended design lives. However, these bridges would have undergone numerous deteriorations over the period of several decades of service life. The asset owners of these bridges are confronted with the decision over whether to continue servicing or decommissioning these bridges. Such decisions are critical from safety and economic points of views, and it can be addressed only by conducting a proper investigation of such structures. This paper presents the capacity assessment of typical in-service masonry arch bridges based on properties of masonry obtained through core testing. The bridges were modeled and analyzed for the ultimate capacity through limit state analysis method. Important parameters such as influence of backfill properties, strength of masonry, and span-to-rise ratio are discussed. The results indicate that the investigated bridges can sustain the current operating loads with a reasonable margin of safety index.

Structural Analysis of Historic Masonry Arch Bridges: Case Study of Clemente Bridge on Savio River

2011 ◽  
Vol 488-489 ◽  
pp. 674-677 ◽  
Author(s):  
Lucio Nobile ◽  
Veronica Bartolomeo ◽  
Mario Bonagura
Keyword(s):  
18Th Century ◽  
Limit State ◽  
Masonry Arch ◽  
Historic Masonry ◽  
Bridge Safety ◽  
Live Loads ◽  
Vehicle Loads ◽  
Arch Bridges ◽  
Masonry Arch Bridge

The Clemente Bridge is a multi-span masonry arch bridge built during the 18th century on Savio River in Cesena. The aim of this paper is to assess its static capacity under live loads prescribed by Italian Standards in force. The analysis is performed employing RING 3.0, a computational tool based on Limit State Analysis. This method allows to individuate the minimum adequacy factor, that is the multiplier on vehicle loads required to cause collapse. In this way, a first assessment on the bridge safety can be obtained.

Seismic fragility curves of as-built single-span masonry arch bridges

2016 ◽  
Vol 14 (11) ◽  
pp. 3099-3124 ◽  
Author(s):  
Giovanni Tecchio ◽  
Marco Donà ◽  
Francesca da Porto
Keyword(s):  
Fragility Curves ◽  
Seismic Fragility ◽  
Masonry Arch ◽  
Arch Bridges
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