Uncertainty sources in the structural assessment of masonry arch bridges: a case study of a single-span stone arch bridge

2019 ◽  
Author(s):  
Borja Conde ◽  
Belén Riveiro ◽  
Manuel Cabaleiro ◽  
Jose Carlos Caamaño ◽  
Georgios E. Stavroulakis
Keyword(s):  
Laser Scanner ◽  
Critical Parameters ◽  
Assessment Procedure ◽  
Masonry Arch ◽  
Structural Assessment ◽  
Arch Bridge ◽  
Uncertainty Sources ◽  
Arch Bridges ◽  
The Impact

<p>In this work, the evaluation of some of the most common uncertain parameters present in the structural assessment procedure of masonry arch bridges is addressed. The Xuño Bridge, a single- span stone arch bridge located in Galicia (Spain) is considered as a case study. This structure presents the particularity that after hundreds of years, all its constructive elements have disappeared except the arch barrel. Thus, the typical scattering in the thickness of this element can be measured and quantified. For that purpose, an in-situ terrestrial laser scanner survey was conducted, acquiring its exact geometry. An uncertainty analysis, considering geometrical and material parameters, was then conducted with the aim of estimating the impact of the uncertainty sources in the prediction of the collapse load of the arch. Two different numerical modeling strategies were employed, the limit analysis approach and the finite element method. A sensitivity analysis was finally performed to identify the critical parameters on the response of the structure.</p>

A Survey on Formation Multi Unequal Span Masonry Bridges with Curve Shaped Deck: A Case Study on Khan Bridge in Iran

2013 ◽  
Vol 405-408 ◽  
pp. 1606-1610
Author(s):  
Zohreh Zahiri ◽  
Dariush Heydari Beni
Keyword(s):  
Structural Stability ◽  
Masonry Arch ◽  
Arch Bridge ◽  
South West ◽  
River Bed ◽  
Arch Bridges ◽  
Masonry Arch Bridge

Masonry arch bridges with unequal spans are outstanding kinds of masonry bridges which are widespread in historic countries spatially in Iran. The differences in dimension of arches which mostly lead to formation of curve shaped decks in such bridges, brings a particular architecture for masonry arch bridge. However the elements which bring different lengths and heights for spans have not yet been studied. In this research by geometrical and structural survey on Khan Bridge, a kind of multi unequal span bridge in south west of Iran, it is demonstrated that especial conditions of the case lead to formation of its architecture. It is illustrated that shape of river bed, hydraulic and geotectonic factors and structural stability, are of paramount importance in terms of featuring the architecture of multi unequal span bridges with curve shaped deck.

Novel Hanger Design to Improve the Robustness of Through Arch Bridges

2011 ◽  
Vol 90-93 ◽  
pp. 862-868
Author(s):  
Qi Ming Wu ◽  
Dang Qi Yang ◽  
Fei Cui ◽  
Xiao Wei Yi ◽  
Rui Juan Jiang
Keyword(s):  
Progressive Collapse ◽  
Time History ◽  
Structural Members ◽  
New Approach ◽  
Arch Bridge ◽  
Structural Robustness ◽  
Arch Bridges ◽  
Dynamic Time ◽  
The Impact ◽  
Emergency Measures

Hangers in through arch bridges are important components since they suspend the bridge deck from the arch ribs. Local damage at a hanger may lead to progressive damage of various components in the arch bridge or even progressive collapse of the bridge. In this paper, the conventional design of double-hangers in through arch bridges is reviewed. Then a new approach to design the double-hangers is put forward. The suitability and robustness of this approach is then verified by a numerical simulation of a real through arch bridge. The impact effects induced by local hanger fracture on other structural members are simulated by dynamic time-history analyses. The new approach to design the hangers for through arch bridges is shown to improve the structural robustness. With the application of the new way put forward here, when one or more hangers are damaged to fail, the through arch bridge will not be endangered and will still maintain the overall load-bearing capacity during an appropriate length of time to allow necessary emergency measures to be taken, which illustrates the leading principle of structural robustness well.

Calculation Analysis of Strengthening Arch Bridge Structure Based on Release Energy Method

2011 ◽  
Vol 71-78 ◽  
pp. 1732-1735
Author(s):  
Qing Ping Jin ◽  
Xian Bao Wang ◽  
Xue Jun Li
Keyword(s):  
Energy Method ◽  
Carrying Capacity ◽  
Safety Margin ◽  
Bridge Structure ◽  
Masonry Arch ◽  
Arch Bridge ◽  
Before And After ◽  
Arch Bridges ◽  
Calculation Analysis ◽  
Masonry Arch Bridge

The arch bridges were used widely for the good performance under the pressure in China. It was very sensitive to some factors as temperature , settlement etc so that the arch bridges occurred the disease, carrying capacity reduction or even structure destruction etc.In the paper, based on the characteristics of masonry arch bridges, reinforcement method was analyzed, according to the situation of a masonry arch bridge, release energy method was applied to strengthening project. By comparing the stress and the strain before and after the strengthening project, some conclusions could be drawn that the bridge structure carrying capacity had been raised, the energy accumulated in the bridge structure was released, the structure safety margin was improved.

Structural Assessment of RC Constructions and Fuzzy Expert Systems

2011 ◽  
pp. 1599-1635
Author(s):  
Mauro Mezzina ◽  
Giuseppina Uva ◽  
Rita Greco ◽  
Giuseppe Acciani ◽  
Giuseppe Cascella ◽  
...  
Keyword(s):  
Risk Mitigation ◽  
Experimental Testing ◽  
Assessment Procedure ◽  
Structural Assessment ◽  
Fuzzy Expert Systems ◽  
Fuzzy Genetic Algorithm ◽  
Seismic Risk Mitigation ◽  
Definition Of ◽  
Fuzzy Genetic

The chapter deals with the structural assessment of existing constructions, with a particular attention to seismic risk mitigation. Two aspects are involved: the appraisal of the actual conditions of the structure (material deterioration, preexisting damages) and the evaluation of the structural “vulnerability,” that is, the propensity to suffer damage because of the intrinsic geometric and structural arrangement, boundary conditions, specific structural details. Attention is first focused on the investigation protocol, which is organized through a multilevel, hierarchical scheme: the procedure includes visual inspections, surveys, experimental testing on site and in laboratory, and gradually proceeds into the details of the problem, progressively refining and verifying hypotheses and preliminary judgments. In a second part, the definition of effective tools for uncertainty management and decision making is performed, by presenting a genetic-fuzzy expert system which handles the procedure of the assessment properly accounting for uncertainty and errors, and is able to tune the parameters involved on the basis of experts’ knowledge, “training” the system. Finally, a case study is presented, applying the whole assessment procedure and the fuzzy genetic algorithm.

Probabilistic structural assessment of railway masonry arch bridges

2015 ◽  
Vol 105 (31) ◽  
pp. 1-10
Author(s):  
Vicente N Moreira ◽  
José C Matos ◽  
Daniel V Oliveira
Keyword(s):  
Masonry Arch ◽  
Structural Assessment ◽  
Arch Bridges

Sensitivity Analysis on Dynamic Properties of Large Span Concrete-Filled Steel Tube Arch Bridge

2012 ◽  
Vol 204-208 ◽  
pp. 1976-1979
Author(s):  
Hang Sun ◽  
Xiao Jian Han ◽  
Xiu Yun Gao
Keyword(s):  
Dynamic Properties ◽  
Steel Tube ◽  
Design Parameters ◽  
Arch Bridge ◽  
Concrete Filled Steel Tube ◽  
Space Model ◽  
Long Span ◽  
Current Design ◽  
Arch Bridges ◽  
The Impact

The calculation formula of the vertical fundamental frequency of arch bridge has been given in current design codes, in which the rise-span ratio is the only variable on condition that the structure mass and stiffness are known. However, the dynamic properties of long-span concrete filled steel tube arch bridges have their own characteristics, which are influenced by a series of factors. Thus this article establishes a space model of a concrete-filled steel tube arch bridge. By analyzing the main design parameters’ influence on the structure dynamic properties, including rise-span ratios, arch-axis coefficient and wide-span ratios, some of conclusions has been made, which can be used for further research of the impact effect and earthquake dynamic response, and provide the necessary basis for the dynamic design of bridges of this kind

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