Numerical Modelling of Floating and Submerged Bridges Subjected to Wave, Current and Wind

2016 ◽  
Author(s):  
Halvor Lie ◽  
Shixiao Fu ◽  
Ivar Fylling ◽  
Arnt G. Fredriksen ◽  
Basile Bonnemaire ◽  
...  
Keyword(s):  
Numerical Modelling ◽  
Bending Moment ◽  
Bridge Design ◽  
Design Concepts ◽  
Floating Foundation

We employed maturely developed methods and software, RIFLEX/SIMO/SIMA to look into the feasibilities of different floating tunnel/bridge design concepts. The global hydroelastic responses of two concepts, i.e. tether/pontoon supported hybrid tunnel concept and floating foundation supported girder concept and have been investigated. The distributions of maximum values of the deflection, bending moment and stress along the bridges under different sea conditions are presented.

Analysis for Seismic Response of Long Span Rigid Frame Bridge

2011 ◽  
Vol 194-196 ◽  
pp. 1962-1966
Author(s):  
Xiao Jun Ning ◽  
Yi Tang Zhou
Keyword(s):  
Seismic Response ◽  
Lower Cost ◽  
Bending Moment ◽  
Bridge Design ◽  
Long Span ◽  
Rigid Frame ◽  
Rigid Frame Bridge ◽  
Intensity Region

Rigid frame bridge is widely used in China because of its lower cost. The aseismatic ability of rigid frame bridge is difficult to judge for designer when the bridge is used to span valley in intensity region. The seismic response of one rigid frame bridge with 160m span is calculated. It is indicated that the aseismatic ability of rigid frame bridge is good and bridge design is controlled by bending moment at bottom of pier.

scholarly journals Quantifying lahar damage using numerical modelling

2016 ◽  
Author(s):  
Stuart R. Mead ◽  
Christina Magill ◽  
Vincent Lemiale ◽  
Jean-Claude Thouret ◽  
Mahesh Prakash
Keyword(s):  
Numerical Modelling ◽  
Critical Infrastructure ◽  
Human Life ◽  
Bending Moment ◽  
Building Damage ◽  
Minor Role ◽  
Building Vulnerability ◽  
Hazard Exposure ◽  
Inundation Area

Abstract. Lahars are volcanic flows containing a mixture of fluid and sediment that have caused significant damage to buildings, critical infrastructure and human life. The extent of this damage is controlled by properties of the lahar, location of elements at risk and susceptibility of these elements to the lahar. Here we focus on understanding lahar-induced building damage. Quantification of building damage can be difficult due to the complexity of lahar behaviour (hazard), uncertainty in number and type of buildings exposed to the lahar (exposure) and the uncertain susceptibility of buildings to lahar induced damage (vulnerability). In this paper, we quantify and examine the relative importance of lahar hazard, exposure and vulnerability in determining building damage with reference to a case study in the city of Arequipa, Peru. Numerical modelling is used to investigate lahar properties important in determining the inundation area and forces applied to buildings. Building vulnerability is quantified through the development of critical depth–pressure curves based on the ultimate bending moment of masonry structures. In the case study area, results suggest that building strength plays a minor role in determining overall building losses in comparison to the effects of building exposure and lahar hazard properties such as hydraulic characteristics of the flow.

Load distribution in edge stiffened slab and slab-on-girder bridge decks

1988 ◽  
Vol 15 (6) ◽  
pp. 977-983 ◽  
Author(s):  
K. N. Smith ◽  
I. Mikelsteins
Keyword(s):  
Load Distribution ◽  
Limit State ◽  
Bending Moment ◽  
Beam Deflection ◽  
Highway Bridge ◽  
Bridge Design ◽  
Grillage Analysis ◽  
Single Vehicle ◽  
Beam Bending ◽  
Girder Bridge

The results of a study on the effect of edge beam geometry on the static live-load load distribution characteristics of single-span slab and slab-on-girder bridge superstructures are presented. Using a grillage analysis, the influence of various forms of edge stiffening on longitudinal bending moment and vertical deflection at midspan was investigated. Two load cases utilizing the Ontario Highway Bridge Design truck were considered. Of particular interest is the load case of a single vehicle in a travelled lane, as edge beam deflection under this condition is governed by a serviceability limit state design requirement of the Ontario Highway Bridge Design Code.For the bridge geometry and loadings considered, all types of edge stiffening significantly affect edge beam bending moment and deflection at midspan; the effect generally increases as the span decreases. Edge beam bending moment increases as the stiffness of the edge beam is increased. Considering the change in edge beam stiffness, edge beam deflection decreases even though the bending moment carried by the edge beam increases. The results of the grillage analysis agree well with an interpretation of the simplified method of analysis of the Ontario Highway Bridge Design Code. When the deflection criterion is affecting a bridge design, it would be beneficial to account for the edge stiffening. Key words: load distribution, edge stiffening, edge beams, bridge deck analysis, grillage analysis.

Numerical Modelling and Experimental Measurement of Lifting Platform Construction for Car Relocation

2015 ◽  
Vol 732 ◽  
pp. 219-222
Author(s):  
Michal Petrů ◽  
Petr Lepšík ◽  
Ondřej Novák ◽  
Aleš Lufinka
Keyword(s):  
Numerical Modelling ◽  
Experimental Measurement ◽  
Production Line ◽  
Bending Moment ◽  
Dynamical Analysis ◽  
Experimental Measurements ◽  
Term Operation ◽  
Assessment Of Stress ◽  
Scissor Mechanism

Numerical modelling and experimental measurements led to the assessment of stress of structural nodes of scissor lifting platform, which is used for relocation of cars from a production line. It also led to optimization of producing process. Immediate load of scissor lifting platform by a car on stand causes additional bending moment that must be captured in a scissor mechanism. At the beginning the experimental measurements on the real lifting platform were made for obtaining of dependence of displacement, velocity and acceleration on time which was almost 1.5±0.1 g. Then dynamical analysis using a numerical method Runge Kutta 4th order of lifting platform were created. Model analysis showed that the initial immediate acceleration of lifting platform at start and immediate deceleration at stop lead to dynamic shocks. These dynamic shocks are due to long term operation dangerous because they permanently load not only pivots but also other parts – bearings and joining parts. A resonance may occur as well. In particular, dynamic shocks caused damage of structural nodes. Immediate load of scissor lifting platform by a car on stand causes additional bending moment. It is not appropriate in terms of long-term operation. Recommended load lifting platform should be symmetrical.

scholarly journals Monopile foundation under lateral cyclic action. Numerical modelling

2019 ◽  
Vol 85 ◽  
pp. 08008
Author(s):  
Andrei Valentin Drăguşin ◽  
Loretta Batali
Keyword(s):  
Numerical Model ◽  
Numerical Modelling ◽  
Numerical Models ◽  
Lateral Displacement ◽  
Large Diameter ◽  
Bending Moment ◽  
Small Scale ◽  
Design Elements ◽  
Pile Diameter ◽  
Starting Point

Foundation of an off-shore wind mill is submitted throughout its existence to a very high number of cycles coming from lateral actions such as waves or wind. These actions have a strong aleatory character which makes them very hard to predict, quantify and analyse. Therefore, in current design practice, these actions are being considered as pseudo-static force at their maximum values, with the cyclic phenomenon being neglected. This can lead to an inappropriate design of the foundation, which could have a negative impact on the future structure. This type of structure is generally built on a monopile foundation, a single, large diameter pile, which will be submitted to thousands lateral cycles. The pile diameter plays an important role, influencing the behaviour of the entire structure. Centrifuge experiments on small-scale models are very useful to study such complex problem as piles under lateral cyclic loads. Several researches have been carried out internationally and the results can be used for calibrating numerical models, which is obviously a more accessible method of design, compared to an experimental approach. This has been precisely the starting point of this paper. The purpose of the present paper is to analyse the influence of the pile diameter, by using a FEM a numerical model, previously calibrated based on centrifuge experiments carried out at IFSTTAR Nantes. For the numerical modelling the software CESAR-LCPC 3D has been used. Several pile diameters have been considered, as follows: 0.72 m, 1.08 m, 1.44 m, 1.80 m, 2.16 m and 2.52 m. The results are taking into account the lateral displacement and bending moment of the piles, for static and cyclic loading. The main objective was to determine the stabilisation rate of the most important two design elements (pile head displacement and maximum bending moment) after “n” cycles and to eventually conclude the diameter value beyond which no more influence of cycles is recorded. The numerical model considered 15 cycles and the results have been used extrapolated in order to determine the cycle “n” of stabilisation (for displacement and bending moment).

scholarly journals Examining the impact of lahars on buildings using numerical modelling

2017 ◽  
Vol 17 (5) ◽  
pp. 703-719 ◽  
Author(s):  
Stuart R. Mead ◽  
Christina Magill ◽  
Vincent Lemiale ◽  
Jean-Claude Thouret ◽  
Mahesh Prakash
Keyword(s):  
Numerical Modelling ◽  
Critical Infrastructure ◽  
Human Life ◽  
Bending Moment ◽  
Building Damage ◽  
Minor Role ◽  
Building Vulnerability ◽  
Inundation Area ◽  
The Impact

Abstract. Lahars are volcanic flows containing a mixture of fluid and sediment which have the potential to cause significant damage to buildings, critical infrastructure and human life. The extent of this damage is controlled by properties of the lahar, location of elements at risk and susceptibility of these elements to the lahar. Here we focus on understanding lahar-induced building damage. Quantification of building damage can be difficult due to the complexity of lahar behaviour (hazard), varying number and type of buildings exposed to the lahar (exposure) and the uncertain susceptibility of buildings to lahar impacts (vulnerability). In this paper, we quantify and examine the importance of lahar hazard, exposure and vulnerability in determining building damage with reference to a case study in the city of Arequipa, Peru. Numerical modelling is used to investigate lahar properties that are important in determining the inundation area and forces applied to buildings. Building vulnerability is quantified through the development of critical depth–pressure curves based on the ultimate bending moment of masonry structures. In the case study area, results suggest that building strength plays a minor role in determining overall building losses in comparison to the effects of building exposure and hydraulic characteristics of the lahar.

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