Ultimate loads of orthotropic bridges continuous over isolated interior supports

1985 ◽  
Vol 12 (3) ◽  
pp. 547-558 ◽  
Author(s):  
John B. Kennedy ◽  
Ibrahim S. El-Sebakhy
Keyword(s):  
Prestressed Concrete ◽  
Structural Engineering ◽  
Ultimate Load ◽  
Test Results ◽  
Yield Line ◽  
Yield Line Theory ◽  
Truck Loading ◽  
Line Theory ◽  
Prestressed Concrete Bridge ◽  
Bridge Models

The collapse loads of orthotropic bridges continuous over isolated interior column supports are predicted by means of the yield-line theory. Equations for the collapse loads are derived for bridges of skew and rectangular planforms, and for an arbitrary angle of inclination of the line joining the centres of the interior columns. The analytical results are verified by experimental test results from prestressed concrete bridge models. Uniformly distributed and concentrated loads as well as Ontario Highway Bridge Design truck loading can be accommodated. A design example illustrating the use of the derived equations is presented. Key words: bridges (orthotropic), isolated supports, model tests, skew, structural engineering, ultimate load.

Mechanical Behavior Analysis of the Unbonded Prestressed Concrete Slabs with Openings Strengthened by Different Methods

2010 ◽  
Vol 163-167 ◽  
pp. 1354-1358
Author(s):  
Xia Cao ◽  
Ling Zhi Jin ◽  
Qiang Fu ◽  
Hong Mei Zhou ◽  
Ya Qiong Liu ◽  
...  
Keyword(s):  
Experimental Data ◽  
Mechanical Behavior ◽  
Bearing Capacity ◽  
Prestressed Concrete ◽  
Concrete Slabs ◽  
Uniform Load ◽  
Yield Line ◽  
Yield Line Theory ◽  
Line Theory ◽  
Lift Off

Based on the contrast experiments of unbonded prestressed concrete slabs with openings subjected to uniform load strengthened by different methods, this paper investigates and analyzes the appearance and the development of cracks, deflections, bearing capacity of the unbonded prestressed concrete slabs that are with strengthening steel and with hidden beams. According to the experimental failure mode of the slabs, prestressed concrete slabs with openings by yield line theory considering the conditions to enhance the contribution of hidden beam and the strengthening steel. Compared with the experimental data, this paper puts forward some bearing capacity lift-off effect of the slabs under different strengthened methods.

scholarly journals Flexural Behavior of Posttensioned Flat Plates Depending on Tendon Layout

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Min Sook Kim ◽  
Young Hak Lee
Keyword(s):  
Maximum Load ◽  
Flexural Behavior ◽  
Test Results ◽  
Flat Plates ◽  
Yield Line ◽  
Yield Line Theory ◽  
Posttensioned Concrete ◽  
Line Theory ◽  
Line Analysis ◽  
Good Agreement

This paper discusses the experimental results on the flexural behavior and deflections of posttensioned concrete flat plates depending on tendon layout. One reinforced concrete flat plate and two posttensioned concrete flat plates were manufactured and tested. One-way posttensioning layout and two-way posttensioning layout were considered in this paper. The load-deflection behavior and modes of crack are presented from the test results. Posttension systems effectively controlled crack and deflection. One-way and two-way posttensioning layouts both showed similar maximum load. However, serviceability improved with two-way posttensioning layout compared to one-way posttensioning layout. Also, the yield-line theory was applied to predict the ultimate load for the posttensioned flat plates. The comparison between the test results and estimation by yield-line analysis generally showed good agreement.

Skew composite bridges — analyses for ultimate load

1995 ◽  
Vol 22 (6) ◽  
pp. 1092-1103 ◽  
Author(s):  
Alaa Helba ◽  
John B. Kennedy
Keyword(s):  
Finite Element ◽  
Ultimate Load ◽  
Ultimate Limit State ◽  
Yield Line ◽  
Skew Bridges ◽  
Truck Loading ◽  
Composite Bridges ◽  
Composite Bridge ◽  
Bridge Models ◽  
Line Analysis

The ultimate limit state design for composite skew bridges with slab-on-I-steel girders requires a reliable prediction of their ultimate load capacity. In this paper, the results from a yield-line analysis of prototype composite bridges subjected to OHBDC truck loading are presented and compared with the results from a nonlinear finite element analysis of such prototype skew bridges. The favourable comparison between the two sets of results indicates that the collapse loads of skew composite bridges can be reliably and readily predicted by the yield-line method of analysis. Equations useful for the design and analysis of skew bridges are given. The experimental results from five composite bridge models tested to failure verify and substantiate the analyses. Results of the ultimate loads of six other skew composite bridge models with punched-to-failure deck slabs are also shown. A general and simplified method relating OHBDC truck loading to the collapse load predicted using the yield-line analysis is presented. Key words: analysis, bridges, composite, design, failure patterns, finite element, models, skew, yield-line.

Limit Analysis and Yield-Line Theory

1968 ◽  
Vol 35 (2) ◽  
pp. 357-362 ◽  
Author(s):  
Antoni Sawczuk ◽  
P. G. Hodge
Keyword(s):  
Limit Analysis ◽  
Single Point ◽  
Point Load ◽  
Simply Supported ◽  
Yield Line ◽  
Yield Line Theory ◽  
Line Theory ◽  
The Relationship ◽  
Line Analysis ◽  
General Method

The relationship between limit analysis and yield-line analysis is investigated. Attention is restricted to simply supported, isotropic slabs subjected to single-point loadings. It is found that conventional yield-line analyses quite often give substantial overestimates of the carrying capacity. A general method is formulated for finding the yield-point load, and various examples are considered.

Yield-line theory and plasticity

1972 ◽  
Vol 24 (78) ◽  
pp. 37-42
Author(s):  
D. H. Clyde
Keyword(s):  
Yield Line ◽  
Yield Line Theory ◽  
Line Theory

Brief Analysis on the Mechanical Behavior Influenced by Opening Locations of the Unbonded Prestressed Concrete Slabs

2011 ◽  
Vol 243-249 ◽  
pp. 774-778
Author(s):  
Ling Zhi Jin ◽  
Hong Mei Zhou ◽  
Qiang Fu ◽  
Xiao Jie Zhou ◽  
Yu Lin Xie
Keyword(s):  
Mechanical Behavior ◽  
Bearing Capacity ◽  
Prestressed Concrete ◽  
Concrete Slab ◽  
Ultimate Bearing Capacity ◽  
Hole Drilling ◽  
Concrete Slabs ◽  
Uniform Load ◽  
Yield Line Theory ◽  
Line Theory

The unbonded prestressed concrete slabs is usually used in big span high-rise buildings. Due to the existence of stairs, elevators, piping shafts and washroom etc，（hole drilling is usually encountered in the floor of unbonded prestressed concrete structures）, which weakens the rigidity of concrete slab, and it has different influences on the slabs with openings in different locations. Based on the contrast experiments of the unbonded prestressed concrete slab with openings in different locations subjected to uniform load, this thesis investigates and analyzes mechanical behavior of the unbonded prestressed concrete slabs with openings in different locations (central，around edge and corner) subjected to uniform load. Using the yield-line theory to calculate the ultimate bearing capacity of pre-stressed slabs with openings, and comparing from experimental results to theoretical ones, this paper puts forward some conclusions of how different opening locations impact the ultimate bearing capacity of pre-stressed slabs with openings

scholarly journals Experimental study on static response of prefabricated concrete bulb-tee bridge girder flange-to-flange connections

2021 ◽  
Author(s):  
Siyin Tu
Keyword(s):  
Experimental Study ◽  
Bridge Deck ◽  
Ultimate Load ◽  
Load Capacity ◽  
Wheel Load ◽  
Ultimate Load Capacity ◽  
Yield Line Theory ◽  
Line Theory ◽  
Bridge Girder ◽  
Ultimate Load Carrying Capacity

Prefabricated concrete Deck Bulb-Tee (DBT) bridge girder system requires precast girder flanges to be connected and formed bridge deck at site. In this study, a new bridge deck slab flange to flange connection system for precast DBT girders has been investigated. Two types of moment transferring connection and another two types of intermittent bolted connection were developed. A total of four full-scale bridge DBTgirders for the developed connection details were fabricated and then tested to collapse under simulated wheel load. This thesis reports on an experimental study on static behavior and ultimate load carrying capacity of bridge Deck Bulb-Tee girders jointed with proposed connection detail and technology. structural behavior, including stress and strain, crack formation and propagation, deflection, failure mode, and ultimate load capacity, has been identified. Experimental results are compared to those obtained using the Yield-Line Theory and the available Punching Shear Equations.

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