scholarly journals COMPREHENSIVE STUDY ON UNDERSLUNG GIRDER BRIDGE UNDER DIFFERENT LOADING CONDITIONS

2017 ◽  
Vol 12 (1) ◽  
pp. 21-29 ◽  
Author(s):  
Ieva Misiūnaitė ◽  
Algirdas Juozapaitis ◽  
Alfredas Laurinavičius
Keyword(s):  
Limit State ◽  
Structural Response ◽  
Experimental Investigations ◽  
Ultimate Limit State ◽  
Loading Conditions ◽  
Structural Behaviour ◽  
Girder Bridges ◽  
Girder Bridge ◽  
Symmetric Load ◽  
Comprehensive Study

The comprehensive study on the structural behaviour of underslung girder bridge is examined in this study through both numerical modelling and experimental 3D model tests. The structural design of steel bridges in many cases is governed by their ability to withstand asymmetric loading conditions. Three different symmetric and asymmetric load cases were investigated to capture the deformational and flexural response of the main girder. It was found that under distributed load the structural response of underslung girder bridge was similar to beam-column with intermediate elastic supports. The numerical model was validated against experimental data with good agreement perceived, allowing an extensive parametric study to be performed. The observed influence of initial geometric imperfections and nonlinearities are discussed. It was found that symmetric load governs the ultimate limit state. However, the asymmetric one takes over in the case of serviceability. Finally, the study presented herein summarises experimental investigations, numerical simulations and design proposals obtained through the recent few years research program, carried on to deepen the knowledge on the structural behaviour of underslung girder bridges.

Research on Extending Span of Box Girder Bridge with Corrugated Steel Webs up to 300m

2019 ◽  
Author(s):  
Dong Xu ◽  
Xiangyong Duanmu ◽  
Yafan Zhou
Keyword(s):  
Limit State ◽  
Ultimate Limit State ◽  
Beam Model ◽  
Box Girder ◽  
Single Beam ◽  
Stability Performance ◽  
Rigid Frame ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
Under Construction

<p>In order to promote the application of steel-concrete composite structure in mountainous areas in China, a conceptual design for a PC continuous rigid frame box-girder bridge with corrugated steel webs and main span of 300 m was performed in the present paper. The combined corrugated steel web was proposed to increase the compressive area and improve the stability performance; thus, the self-weight of the composite box-girder bridge is significantly reduced. Flexural capacity of the whole section had been calculated with a single-beam model for the ultimate limit state (ULS). For the service limit state (SLS) design, the calculation for the composite box-girder bridge was conducted with the spatial grid model (SGM), from which 27 complete checking stresses in three layers (i.e. outside, inside and middle planes) of concrete plates and steel webs in every cross-section could be obtained. The stress history under construction stage was incorporated into the results obtained by SGM. Moreover, the stress states and stability performance for the composite box-girder bridge constructed were evaluated. The present investigation can provide references for the design and construction of the composite box-girder bridge with corrugated steel webs for long spans.</p>

Study of a curved continuous composite box girder bridge

1993 ◽  
Vol 20 (1) ◽  
pp. 107-119 ◽  
Author(s):  
S. F. Ng ◽  
M. S. Cheung ◽  
H. M. Hachem
Keyword(s):  
Finite Element ◽  
Structural Response ◽  
Shell Element ◽  
Elastic Response ◽  
Box Girder ◽  
Girder Bridges ◽  
Bridge Model ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
Critical Sections

To better understand the behaviour of curved box girder bridges in resisting eccentric design truck loads, and the influence of plan curvature on the structural response, a model study was conducted at the University of Ottawa. In this study, the elastic response of a curved composite box girder bridge model was evaluated experimentally and confirmed analytically using the finite element method. Analytical predictions of both vertical displacements and normal stresses at critical sections compared fairly well with those evaluated experimentally. The isoparametric thin shell element employed in the analysis proved to be versatile and provided an accurate representation of the various structural components of a curved box girder bridge. Despite the eccentric nature of the applied OHBDC design truck loads and the bridge plan curvature, it was evident that in resisting the applied live loads, the girders at critical sections share equal proportions of the applied bending moments. Key words: bridge, curved, cellular, composite, eccentric loads, static, linear, experimental, finite element.

scholarly journals Practical Model Proposed for the Structural Analysis of Segmental Tunnels

2020 ◽  
Vol 10 (23) ◽  
pp. 8514
Author(s):  
Jatziri Y. Moreno-Martínez ◽  
Arturo Galván ◽  
Fernando Peña ◽  
Franco Carpio
Keyword(s):  
Finite Element ◽  
Soft Soil ◽  
Limit State ◽  
Structural Response ◽  
3D Models ◽  
Complex Model ◽  
Numerical Results ◽  
Point Of View ◽  
Simplified Model ◽  
Ultimate Limit State

The construction of tunnels has become increasingly common in city infrastructure; tunnels are used to connect different places in a region (for transportation and/or drainage). In this study, the structural response of a typical segmental tunnel built in soft soil was studied using a simplified model which considers the coupling between segmental rings. From an engineering point of view, there is a need to use simple and reliable finite element models. Therefore, a 1D model based on the Finite Element Method (FEM) composed of beam elements to model the segments and elastic-linear springs and non-linear springs to model the mechanical behavior of the joints was performed. To validate the modeling strategy, the numerical results were compared to (lab-based) experimental results, under an Ultimate Limit State, obtained from the literature, and a comparison between numerical results considering a 3D numerical complex model which included the nonlinearity of concrete, reinforcing steel and the joints was performed. With this simplified model, we obtained a prediction of approximately 95% of the ultimate loading capacity compared to the results developed in the experimental and 3D models. This proposed model will help engineers in practice to create “rational” structural designs of segmental tunnel linings when a “low” interaction between rings is expected.

Positioning of bearings for curved continuous spread-box girder bridges

2002 ◽  
Vol 29 (5) ◽  
pp. 641-652 ◽  
Author(s):  
Magdy Samaan ◽  
Khaled Sennah ◽  
John B Kennedy
Keyword(s):  
Finite Element ◽  
Natural Frequencies ◽  
Structural Response ◽  
Element Model ◽  
Extensive Study ◽  
Mode Shapes ◽  
Box Girder ◽  
Girder Bridges ◽  
Bridge Superstructure ◽  
Girder Bridge

The type and arrangement of bearings for a bridge superstructure are important considerations in bridge design. For a curved continuous spread-box girder bridge, the support conditions for the bridge superstructure may significantly influence the distribution factors for maximum stresses, reactions, and shear forces as well as the bridge natural frequencies and mode shapes. Current design practices in North America recommend very few guidelines for bearing arrangements and types. This paper describes an extensive study carried out using an experimentally calibrated finite element model, in which curved continuous prototype bridges were analyzed to determine their structural response. Six different types and arrangements of support bearings were studied to determine their effect on the maximum stress and reaction distributions as well as on the natural frequencies of such bridges. The results were used to suggest the most favourable bearing arrangement and type.Key words: bridge bearings, composite, continuous, curved bridges, design, distribution factors, finite element, spread-box.

scholarly journals Structural Phenomenon of Cement-Based Composite Elements in Ultimate Limit State

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
I. Iskhakov ◽  
Y. Ribakov
Keyword(s):  
Limit State ◽  
Structural Response ◽  
Minimax Principle ◽  
Ultimate Limit State ◽  
Spatial Structures ◽  
Design Concepts ◽  
Dynamic Loadings ◽  
Ultimate Limit ◽  
Additional Equation ◽  
Theoretical Results

Cement-based composite materials have minimum of two components, one of which has higher strength compared to the other. Such materials include concrete, reinforced concrete (RC), and ferrocement, applied in single- or two-layer RC elements. This paper discusses experimental and theoretical results, obtained by the authors in the recent three decades. The authors have payed attention to a structural phenomenon that many design features (parameters, properties, etc.) at ultimate limit state (ULS) of a structure are twice higher (or lower) than at initial loading state. This phenomenon is evident at material properties, structures (or their elements), and static and/or dynamic structural response. The phenomenon is based on two ideas that were developed by first author: quasi-isotropic state of a structure at ULS and minimax principle. This phenomenon is supported by experimental and theoretical results, obtained for various structures, like beams, frames, spatial structures, and structural joints under static or/and dynamic loadings. This study provides valuable indicators for experiments’ planning and estimation of structural state. The phenomenon provides additional equation(s) for calculating parameters that are usually obtained experimentally and can lead to developing design concepts and RC theory, in which the number of empirical design coefficients will be minimal.

Ultimate load distribution characteristics of a model slab-on-girder bridge

1987 ◽  
Vol 14 (6) ◽  
pp. 739-752 ◽  
Author(s):  
M. S. Cheung ◽  
N. J. Gardner ◽  
S. F. Ng
Keyword(s):  
Load Distribution ◽  
Limit State ◽  
Ultimate Limit State ◽  
Live Load ◽  
Nonlinear Behaviour ◽  
Distribution Characteristics ◽  
Load Redistribution ◽  
Girder Bridge ◽  
Load Distribution Factors ◽  
Ultimate Limit

The introduction of limit states design philosophy and the ever growing demand for higher permissible loads for overload vehicles or special permit vehicles necessitates a thorough investigation of the behaviour and live load distribution characteristics of bridges beyond the working stress range. Evaluation of the live load moment capacity at ultimate utilizing elastic load distribution factors is neither realistic nor logical, as the distribution factors should reflect the ultimate structural/load responses including nonlinear behaviour, load redistribution due to yielding, etc.The purpose of this paper is to study load distribution characteristics of a slab-on-girder bridge model at ultimate loads and to develop load distribution factors for the ultimate limit state which include load redistribution, nonlinear behaviour, and other effects. Key words: load distribution factor, ultimate limit state, load redistribution, nonlinear behaviour, slab-on-girder bridge, OHBD truck.

scholarly journals Structural analisys of concrete pre-stressed reservoirs for sludge fermentation – water waste treatment plant bucharest – glina. numerical fem assessment of the structural response for static in-duty loads

2013 ◽  
Vol 9 (1) ◽  
pp. 42-58
Author(s):  
Tudor Bugnariu
Keyword(s):  
Waste Treatment ◽  
Numerical Models ◽  
Limit State ◽  
Treatment Plant ◽  
Structural Response ◽  
Soil Mass ◽  
Ultimate Limit State ◽  
Element Analysis ◽  
Waste Treatment Plant ◽  
Water Waste

Abstract The paper refers to a structural finite element analysis on the reservoirs for sludge fermentation subjected to static in-duty loads, at Glina Water Waste Treatment Plant. The purpose was to assess the stress and deformation states in subsequent erection and service conditions, to verify the design provisions and to emphasize the sensitivities, for a structure which was designed in the ‘80s based on analytical procedures. The results obtained on the numerical models highlight the importance of the soil-structure interaction, in peculiar the one influenced by the soil mass deformability, on the overall structural response. Based on the calculated stresses, all structural components were verified according to the actual design codes at the ultimate limit state and the service limit state (water tightness/crack emergence).

Analysis of the Superstructure of South-to-North Water Diversion Bridge

2012 ◽  
Vol 178-181 ◽  
pp. 2125-2130
Author(s):  
Ming Hong Li ◽  
Yi Li Wang ◽  
Shui Wan
Keyword(s):  
Prestressed Concrete ◽  
Limit State ◽  
Vertical Shear ◽  
Water Diversion ◽  
Ultimate Limit State ◽  
North Water ◽  
Corrugated Steel Web ◽  
Girder Bridge ◽  
Standard Limit ◽  
Ultimate Limit

Based on the South-to-North Water Diversion Bridge (70m+120m+70m prestressed concrete composite box-girder bridge with corrugated steel webs), structural static analysis of the bridge’s superstructure was taken out by finite element method, which were checked with the existing regulatory requirements. The result indicates that the carrying capacity in the ultimate limit state meet the requirement of the standard, the vertical shear stress of corrugated steel web satisfies the standard limit and the thickness of corrugated steel web satisfies the request, but the safety factor is not high.

scholarly journals Research of Road Bridge Composite Steel Girder for Different Load Conditions

2019 ◽  
Vol 8 (2S8) ◽  
pp. 1479-1484
Keyword(s):  
Limit State ◽  
Design Stage ◽  
Software Modeling ◽  
Modeling And Analysis ◽  
Railway Line ◽  
Girder Bridges ◽  
Girder Bridge ◽  
Design Calculations ◽  
Load Conditions ◽  
Plate Girder

A bridge structure is a mean by which a road, railway and many other services are carried over an obstacle such as a valley, river and other road or railway line, either with few number of supports at various locations or with no intermediate support. While finalization of any types of bridge; Economy, Strength, Safety are the basic key features that cannot be neglected in the construction of any bridge. However the Indian standards are basically derived from the British Standards only, but the basic concept behind that is same. Only the value of various parameters varies according to the design and fabrication/ erection practices which exist in India. In this paper a plate girder bridge is designed as per the Limit state method using the IS 800:2007, IRC: 24-2000, IRC: 6-2017 and analyzed with the help of STAAD.pro v8i software. Modeling and analysis of Deck Bridge was carried out by considering various live load conditions such as for Class A loading, 70R tracked and 70R wheeled vehicle. Design calculations are carried out for simply supported single span. Seismic and wind effects are not taken into account at the design stage. Based on the design and analysis results, conclusions are drawn to know the behavior of plate girder bridges for different load conditions. Results are presented in both graphically and tabular format.

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