Effects of skew angle on simple span bridge decks under simulated truck loading

by Paul M. Kuzio

Publisher: University of Florida

Written in English
Published: Downloads: 779
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Subjects:

  • Civil engineering
ID Numbers
Open LibraryOL25525746M

A parametric study on the interaction of the support boundary conditions and bridge girders was performed. The parameters studied included the skewness of the bridge and the effect of the bearing stiffness on the bridge system. A finite element model of a bridge superstructure containing Florida bulb tee 78 girders was created using ANSYS software. effects of varying superstructure plan geometry, number of cells, skew angle, type of loading, and depth. Basic Concepts The obtuse corner reactions for any symmetrical loading condition will exceed acute corner reactions when a simple span, skewed box-girder superstructure on paral­ lel abutments is supported at its corners. Figure 1 shows. in the figures is for a 2-span, ft long bridge model with 60º skew angle. The deflection shown in the first figure has a scale factor of Figure 4 – Undeformed Shape of a 2-Span Model with 60 ° Skew Angle Figure 5 – Deformed Shape of a 2-Span Model with 60 ° Skew Angle The analysis to investigate the effect . The bridge parameters considered in the analysis included skew angle, length of the bridge span, beam spacing, the ratio of beam spacing to span (aspect ratio), and the ratio of the girder’s stiffness to slab stiffness. The effects of diaphragms on moments from truck and lane loading on continuous slab and girder bridges were studied. The.

Skew angle has significant effect on live load distribution factor. The ratio of distribution factor at any. skew angle to the distribution factor at zero skew shows the effect of skew (Barr et al., ). For a bridge with skew, the shear at the obtuse corner has been found to . In this paper, simple span NEXT beam bridges are considered. Tonly he restraints are obtain the maximum loading effects on the exterior beam. The load case is then moved In order to calculate the SCFs for LLDFs for shear, the unskewed NEXT beam bridge (i.e., skew angle=o) is 0used as a benchmark. For example, for a bridge with four. Chapter 10 - Bridge Hydraulics Publication Edition 10 - 1 CHAPTER BRIDGE HYDRAULICS. INTRODUCTION TO BRIDGES. A. General - Bridges. Bridges serve a variety of highway purposes including the elimination of conflicts with traffic and other modes of transportation, such as rail, marine, air and pedestrian. Bridges enable. A span 24 m of simply supported right bridge deck with I-section prestressed concrete girders is taken as the case study to obtain the values of the bending moment's distribution for the two types of skewness (types 1 and 2) and the results of skew types are compared against the moments of the right deck span of the bridge.

As can be seen, a total of 32 right bridges are explored. In order to determine the skew angle effects on the live load distribution, additional four different skewed bridges (i.e., skew angle = 10°, 20°, 30° and 40°) are analyzed for each right bridge, leading to a total of bridges being investigated in this paper. Example - Modified loading for standard AASHTO loads Determine the AASHTO truck and lane loads for H and HS loadings. Solution H Loading The GVW of an H truck load is 10 tons, or 20, pounds. From Figure , the GVW is distributed 20 percent to the front axle and 80 per­ cent to the rear axle. shelf angle- see SEAT ANGLE. shim-a thin plate inserted between two elements to fix their relative position and to transmit bearing stress. shoe-a pedestal-shaped member beneath the superstructure bearing that transmits and distributes loads to the substructure bearing area. shop-a factory or workshop. shore-a strut or prop placed against or beneath a structure to restrain movement. The classical smeared cracking model is widely used in reinforced concrete analysis. Falconer [] defined the equilibrium equations of a plane element by considering a compression field of concrete on the plasticity approach, Nielsen [] established the design equations for the orthogonal reinforcement of a concrete panel subjected to membrane forces.

Effects of skew angle on simple span bridge decks under simulated truck loading by Paul M. Kuzio Download PDF EPUB FB2

TABLEOFCONTENTS PAGE ACKNOWLEDGEMENTS ii CHAPTER1 INTRODUCTION 1 Overview 1 TheNatureofPlateBending 2 NumericalMethods 4 CHAPTER2MESHSIZESTUDY 6 Introduction 6 DeterminationofElementSize 7 EffectofAspectRatio 16 CHAPTER3PARAMETERSTUDY 22 Introduction 22 Procedure 24 Results 39 ContourPlotDescriptions 40.

An illustration of an open book. Books. An illustration of two cells of a film strip. Video An illustration of an audio speaker.

Effects of skew angle on simple span bridge decks under simulated truck loading. Item Preview Effects of skew angle on simple span bridge decks under simulated truck loading. by Kuzio, Paul M. Publication date Pages: EFFECTS OF SKEW ANGLE ON SIMPLE SPAN BRIDGE DECKS UNDER SIMULATED TRUCK LOADING by PAUL M.

KUZZO A REPORT PRESENTED TO THE GRADUATE CO"lITTEE 4 OF THE DEPARTMENT OF CIVIL ENGINEERING IN PARTIAL FULFILLMENT OF THE REQUIREM4ENTS FOR THE DEGREE OF MASTER OF EN&IKEERIt4G UNIVERSITY OF FLORIDA SUMMER E 1 i. For the T- beam bridges with small skew angle, it is frequently considered safe to ignore the angle of skew and analyze the bridge as a right bridge with a span equal to the skew span.

However. Effects of skew angle on simple span bridge decks under simulated truck loading. By Paul M. Kuzio Get PDF (7 MB)Author: Paul M. Kuzio. effect of the skew angle on LDF of curvedskew deck under moving vehicle.

For this purpose, a versatile and computationally efficient bridge-vehicle-interaction model is developed using space bridge and vehicle structure modeled by ANSYS program. The vehicle is modeled as three-axle mass-spring-damper system.

The analysis. The effect of a skew angle on simple-span reinforced concrete bridges is presented in this paper using the finite-element method. The parameters investigated in this analytical study were the span length, slab width, and skew angle. The design of skew bridges has special consideration particularly in bridges up to 20 m span.

The skew is defined as the inclination of the abutment to the perpendicular between the free edges. The effect of skew angle up to 20° can be neglected on the variation of bendings and shears in slabs and beams. Bridges with skew angle more than 45 0 are rare.

Keywords: Bridges, T-beam bridge decks, skew angle, span length, Grillage Analogy method, Grid size Class A Vehicle.

INTRODUCTION Generally, grillage analysis [8] is the most common method used in bridge analysis. In this method the deck is represented by an equivalent grillage of beams. As skew is added, there is much more interaction – bridge decks will always tend to span square.

Thus skew decks are less efficient at load carrying and skew transverse bracing will be less efficient than bracing at right angles to the main members. For a beam and slab, the strength tries to follow the direction of the girders.

2 Test Case: 60° Skew, ft Span FRAMING PLAN TRANSVERSE SECTION Analysis of Test Case, Line Girder Model: • We will conduct an initial analysis of the test structure using a Line Girder Model.

• This is the most commonly used analysis method for non-complex bridges, and is used by many common software packages. span length, number of cells and skew angle of superstructure are the most critical parameters affecting the live load distribution of moment over bridge deck.

The following conclusions also obtained from this study: 1. The AASHTO specifications calculate highly conservative values for. With increasing the skew angle, the stresses in the box girder bridge deck and reactions on the abutment vary significantly from those in straight slab.

The magnitude and intensity of these effects depends on the angle of skew, aspect ratio of the slab and the type of construction of deck.

Skew bridges No. SCI P Guidance notes on best practice in steel bridge construction /1 Revision 3 Scope This Guidance Note relates principally to the design and construction of deck-type and half-through skew bridge decks.

Deck-type bridges, which comprise steel girders sup-porting a composite concrete slab at the top. Simple supported single span bridge is considered in this study. The analysis results shows that as skew angle increases, reaction increases, bending moment decreases but torsion and transverse moment increases up to a certain angle, after which it decreases.

The effect of skewness on the behaviour of bridge deck is studied for skew angle 0 0. A skew arch is a method of construction that enables masonry arch bridges to span obstacles at an angle ().Bridges with a small amount of skew (i.e., less than 30°) can be constructed using bedding planes parallel to the abutments (Melbourne and Hodgson, ).However, bridges with large amount of skew present significant construction difficulties.

For decks with a skew angle of 60° the distribution factors decrease by way of % in comparison with proper bridges.

However, for decks with a skew angle as much as 30°, this effect is insignificant. Torsion due to deal load and class A loading is zero in 00skew in bridge, as skew angle increases torsion also increases for dead load and class A loading. In case of class 70R loading the torsion at 00skew is maximum.

As the skew angle increases it goes on. This paper focuses on the behavior of skewed concrete bridge decks on steel superstructure subjected to truck wheel loads. It was initiated to meet the need for investigating the role of truck loads in observed skewed deck cracking, which may interest bridge owners and engineers.

The effect of skew angle on a simple span concrete deck girder bridge is presented in this paper. A unidirectional ground motion, compatible with design acceleration spectrum is applied in the longitudinal direction of the bridge.

from various previous studies done on the effect of skew angle on static behavior of reinforced concrete slab bridge decks and related topics. The skew angle can be defined as the angle between the normal to the centreline of the bridge and the centreline of the abutment or pier cap., Skew bridges have.

bridge, the skew angle at all supports would normally be the same and the term skew angle can be applied to the bridge as a whole.

The simple form of bridge is right deck but demand of skew bridge is increasing due to various factors. Literature Review [1] Vikash Khatri, Anshuman Khar, P.

The effects of the following parameters on the seismic performance of the skew bridges were investigated: (1) skew angle (0° to 60°); (2) ground motion intensity ( to g); (3) soil type (B and D); (4) abutment support conditions including pounding, abutment-soil interaction, and shear keys (it is noted that all of the models included.

However, the bridge's degree skew angle shifted the camber point for each beam, which had to be accounted for when paving the deck.

A substantial vertical curve added to. Manassa [18] the effect of a skew angle on simple-span reinforced concrete bridges using the finite-element method.

The parameters investigated in this analytical study were the span length, slab width, and skew angle. The finite-element analysis (FEA) results for skewed bridges were compared to the reference straight bridges as well as the.

Skew angle is the angle between the straight line and perpendicular line. skew bridge is defining as the deck slab of bridge is not right angle with the abutments.

Hence the embankments are not exactly parallel to each other. Skew bridges gives a verity of ideas and solutions in alignments of roadway. The term ‘angle of skew’ or ‘skew angle is basically the angle between a normal/perpendicular to the alignment/centerline of the bridge and the centerline of the pier.

Thus, on a straight bridge, the skew angle at all supports would normally be the same and the term skew angle can be applied to the bridge. power, detailed analysis and detailing of the skew bridge deck has always been a challenge. Skew Bridge When stream crosses the road at an angle other than 90˚, such a bridge is called a skew bridge.

Previously engineers used to construct square bridges even for skew bridges as knowledge of skew behaviour was not developed. the bridge. They are the angle of skew, n: the bridge span, a, and the girder spacing, b.

These three parameters have already been defined in Figure 1. Wherever convenient. a fourth dimensionless parameter, the girder spacing to span ratio, b/a, is used. Structural Parameters A large number of variables determine the structural prop­.

The effect of a skew angle on simple-span reinforced concrete bridges is presented in this paper using the finite-element method. The parameters investigated in this analytical study were the span length, slab width, and skew angle.

The finite-element analysis (FEA) results for skewed bridges were compared to the reference straight bridges as. • The torsional moment decrea edge beam for both dead load and compared to without edge beam.

reduction in Torsional moment due to the provision of edge beam in the slab bridge deck. 60 Skew Angle (Degrees) 1 0 0 20 LongitudinalSaggingBending Moment(kNm) Skew Angle (Degrees) 60 Skew Angle (Degrees) 1.D.L.

Bending moment of 30m span deck increases slightly at 0°angle after that decreases gradually. There is a large difference in magnitude of values of 25m and 30m span deck at all the skew angle.

Fig B.M. vs Skew angle (Outer girder) Fig B.M. vs Skew angle (Outer girder) Shear force. For 60 degrees skew, the maximum deck stress is in the X-direction and occurs under X-direction loading.

For other skew angles, maximum stress is also in the X-direction but it occurs under Y-direction loading. Download: Download full-size image; Fig. 9. Maximum deck stress vs span length: 10 m wide bridge (a),(c); 14 m wide bridge (b),(d).