scholarly journals Experimental and Numerical Investigation on the Bearing Behavior of Curved Continuous Twin I-Girder Composite Bridge with Precast Concrete Slab

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Chuandong Shen ◽  
Yifan Song ◽  
Lei Yan ◽  
Yuan Li ◽  
Xiaowei Ma ◽  
...  
Keyword(s):  
Yield Strength ◽  
Bearing Capacity ◽  
Ultimate Load ◽  
Ultimate Bearing Capacity ◽  
Experimental Result ◽  
Small Radius ◽  
Radius Of Curvature ◽  
Construction Scheme ◽  
Composite Bridge ◽  
Bearing Behavior

Curved twin I-girder composite bridge (TGCB) is becoming popular in Chinese highway bridge building. To study its ultimate bearing behavior, in this paper, one 1 : 5 scale intact model of a two-span curved continuous TGCB was tested to failure to evaluate its safety reserve and ductility. Afterwards, based on the experimental result, 3D FE models were developed and validated. At last, using the validated 3D FE models, the effect of construction scheme, radius of curvature, yield strength of steel, concrete compressive strength, crossbeams, and bottom lateral bracings on the ultimate bearing capacity were examined. The experimental results showed that the ultimate load (Pu) is approximate 13.6 times the service equivalent load. The cracking load and yielding load are approximately 0.12 and 0.47 Pu, respectively. The ductility coefficients are 4.06∼4.40. These above may indicate that the TGCB designed according to Chinese codes has good safety reserve and ductility. From parameter analysis results, it was concluded that the TGCB with full-support construction scheme has larger yield load and ultimate load compared with the one with erecting machine construction scheme. On the other hand, the ultimate bearing capacity reduces nonlinearly with the increase of curvature. Besides, the yield strength of steel, crossbeams, and bottom lateral bracings has a significant effect on the ultimate bearing capacity of curved TGCB. And the smaller the radius of curvature, the more obvious the effect of the latter two factors is. Unfortunately, it is unwise to continuous to improve the ultimate load by increasing the grade of steel for the TGCB when steel grade exceeds Q390. Moreover, in consideration of the big difference in bearing capacity between the inner girder and outer girder of the TGCB with small radius of curvature as well as the economy, it is suggested that the inner and outer steel girders of that TGCB should be designed differently.

Experimental Research on Steel-High Performance Concrete Composite Bridge Towers and Piers

2011 ◽  
Vol 255-260 ◽  
pp. 1303-1306
Author(s):  
Chun Sheng Wang ◽  
Xin Xin Wang ◽  
Qian Wang
Keyword(s):  
Mechanical Properties ◽  
Bearing Capacity ◽  
High Performance ◽  
High Performance Concrete ◽  
Ultimate Bearing Capacity ◽  
Bridge Engineering ◽  
Good Prospect ◽  
Compression Tests ◽  
Composite Bridge ◽  
Bridge Tower

Steel-concrete composite bridge towers have the advantages of steel and concrete, they have a good prospect in bridge engineering. However, the applications and related researches of composite bridge towers in China are rare. Therefore, in this article, two types of steel-high performance concrete composite bridge tower and pier models, which had none and one row of longitudinal stud connectors, were designed. The axial compression tests were practiced on the two specimens, in order to study the influence of connectors on the mechanical properties of the composite bridge towers and piers. From the tests, the ultimate bearing capacity and failure mode were obtained, and the regularities of strains and deformations were also analyzed. The results show that setting up stud connectors on the composite towers and piers can improve the ductility and the ultimate bearing capacity obviously.

scholarly journals Experimental Study and Mixed-Dimensional FE Analysis of T-Rib GFRP Plate-Concrete Composite Bridge Decks

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Jun Tian ◽  
Xiaowei Wu ◽  
Yu Zheng ◽  
Yinfei Du ◽  
Xiankai Quan
Keyword(s):  
Bearing Capacity ◽  
Bridge Decks ◽  
Concrete Structures ◽  
Ultimate Bearing Capacity ◽  
Fe Analysis ◽  
Interface Roughness ◽  
Structural Performance ◽  
Computational Time ◽  
Analysis Model ◽  
Composite Bridge

In order to extend the understanding of structural performance of a T-rib glass fibre-reinforced polymer (GFRP) plate-concrete composite bridge deck, four GFRP plate-concrete composite bridge decks were tested, which consist of cast-in-place concrete sitting on a GFRP plate with T-ribs. Subsequently, a mixed-dimensional finite element (FE) analysis model was proposed to simulate the behavior of the test models. The test and simulation results showed that the composite specimens had an excellent interface bonding performance between GFRP plate and concrete throughout flexural response until specimens failure occurred. The failure mode of those composite specimens was shear failure in concrete structures. It was found that the interface roughness of the GFRP plate could not affect the ultimate bearing capacity and stiffness of composite specimens significantly. However, the height of concrete structures had a strong effect on those structural behaviors. In addition, the longitudinal compressive reinforcing CFRP rebars had a little influence on ultimate bearing capacity of composite specimens, while it had a significant influence on ductility of composite specimens. The mixed-dimensional FE analysis model can accurately simulate the local complex stress state of GFRP plates, ultimate loads, stiffness, and midspan deflections and simultaneously can significantly reduce computational time. Therefore, mixed-dimensional FE analysis can provide a suitable solution to simulate the structural performance of T-rib GFRP plate-concrete composite bridge decks.

The Research for Mechanical Properties after Fire of Concrete-Filled Steel Bridge Piers under Axial Loads

2015 ◽  
Vol 744-746 ◽  
pp. 340-344
Author(s):  
Xin Wang
Keyword(s):  
Yield Strength ◽  
Bearing Capacity ◽  
Capacity Utilization ◽  
Ultimate Bearing Capacity ◽  
Displacement Curve ◽  
Steel Bridge ◽  
Axial Loads ◽  
Finite Element Software ◽  
Whole Process ◽  
Different Temperatures

Objective. To analysis of steel concrete piers load - displacement curve of the whole process, to explore steel concrete piers ultimate bearing capacity and deformation effects at different temperatures. Method. Using ABAQUS finite element software for concrete piers steel axial compression nonlinear analysis, analyze the effects of different temperatures on the piers ultimate bearing capacity and deformation capacity utilization of the whole curve obtained. Results. As the temperature increases, the ultimate bearing capacity of concrete steel piers greatly reduced, the yield strength of the material is also decreased, reached the ultimate bearing capacity of the pier when the corresponding displacement is also significantly reduced. Conclusion. The temperature has a significant impact on ultimate bearing capacity and yield strength.

Analysis of bearing capacity of rigid piles under eccentric and inclined loads

1986 ◽  
Vol 23 (2) ◽  
pp. 127-131 ◽  
Author(s):  
T. Koumoto ◽  
G. G. Meyerhof ◽  
V. V. R. N. Sastry
Keyword(s):  
Bearing Capacity ◽  
Key Words ◽  
Ultimate Load ◽  
Ultimate Bearing Capacity ◽  
Experimental Results ◽  
Inclined Loads ◽  
Single Piles ◽  
Strip Footings

An investigation is made of the eccentricity and inclination factors for estimating the ultimate bearing capacity of rigid single piles in homogeneous soils under eccentric and inclined loads. For combined eccentric inclined loads the corresponding theoretical factors are obtained by combining inclination factors and eccentricity factors, which are derived from extending the theory of inclination factors for shallow strip footings. The theoretical values of inclination factors, eccentricity factors, and eccentric inclination factors are compared with some experimental results of model piles in sand and clay. Key words: bearing capacity, clay, eccentricity factors, eccentric inclination factors, inclination factors, rigid piles, sand, ultimate load.

scholarly journals Behavior of Concrete-Filled Steel Tube Columns Subjected to Axial Compression

2018 ◽  
Vol 2018 ◽  
pp. 1-15 ◽  
Author(s):  
Pengfei Li ◽  
Tao Zhang ◽  
Chengzhi Wang
Keyword(s):  
Bearing Capacity ◽  
Axial Compression ◽  
Ultimate Load ◽  
Steel Tube ◽  
Ultimate Bearing Capacity ◽  
Plastic Behavior ◽  
Numerical Comparison ◽  
Reinforcing Bars ◽  
Concrete Filled Steel Tube ◽  
Cfst Columns

The behavior of concrete-filled steel tube (CFST) columns subjected to axial compression was experimentally investigated in this paper. Two kinds of columns, including CFST columns with foundation and columns without foundation, were tested. Columns of pure concrete and concrete with reinforcing bars as well as two steel tube thicknesses were considered. The experimental results showed that the CFST column with reinforcing bars has a higher bearing capacity, more effective plastic behavior, and greater toughness, and the elastoplastic boundary point occurs when the load is approximately 0.4–0.5 times of the ultimate bearing capacity. The change of rock-socketed depth and the presence of steel tube will affect the ultimate bearing capacity of rock-socketed pile. The bearing capacities of the rock-socketed CFST columns are lower than those of rock-socketed columns without a steel tube under a vertical load; besides, the greater the rock-socketed depth, the greater the bearing capacity of the rock-socketed piles. In addition, a numerical comparison between the ultimate load and the theoretical value calculated from the relevant specifications shows that the ultimate load is generally considerably greater than the theoretical calculation results.

Research on the Flexural Behaviour of Reinforced Concrete Beams Strengthened with CFRP

2011 ◽  
Vol 194-196 ◽  
pp. 1781-1784
Author(s):  
Hua Wei ◽  
Ji Ye Zhang ◽  
Da Wei Zhu ◽  
Zhi Yuan Peng ◽  
Hai Jun Wang
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Ultimate Load ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced Polymer ◽  
Experimental Result ◽  
Reinforced Polymer ◽  
Flexural Member ◽  
Good Agreement

In order to clear the influence of carbon fiber reinforced polymer (CFRP) on the bearing capacity of reinforced concrete beams, tests of three reinforced concrete beams strengthened with CFRP are carried out. Experimental result shows that CFRP can effectively increase bearing capacity of flexural member, and can restrain the development of crack. Cracking load, yield load and ultimate load are significantly increased. At the same time numerical simulation is done; it is good agreement with experimental results.

Experimental study on transverse stress of different forms of concrete bridge deck

2021 ◽  
Author(s):  
Xieli Zhang ◽  
Chong Wu ◽  
Qingtian Su ◽  
Xiaomao Feng ◽  
Xiaoyong Zhou
Keyword(s):  
Bearing Capacity ◽  
Bridge Deck ◽  
Steel Plate ◽  
Concrete Slab ◽  
Ultimate Bearing Capacity ◽  
Concrete Bridge ◽  
Composite Bridge ◽  
Concrete Bridge Deck ◽  
Post Tension ◽  
Stress And Deformation

<p>Steel plate composite bridge is one of the most widely used form of bridges. With the application of pre- stressed concrete, the improvement of thick steel plate quality and welding technology, steel plate composite bridge with less main girder has been widely used in engineering. To compare the mechanical properties of twin-girder and multi-girder steel plate bridge, two full-scale concrete bridge deck specimens are manufactured and tested. The stress and deformation of the structural members of the two specimens are tested, the development of concrete cracks is recorded in detail, and the ultimate bearing capacity and failure form are obtained. The test results show that the concrete slab in the form of twin-girder with post- tension will not crack under the normal vehicle load, while multi-girder one will crack, and the maximum crack width is 0.02 mm. The ultimate bearing capacity of twin-girder is 622 kN and the multi-girder is 850 kN. The failure mode of twin-girder is tension failure, and multi-girder is compression failure.</p>

Pile capacity for eccentric inclined load in clay

1984 ◽  
Vol 21 (3) ◽  
pp. 389-396 ◽  
Author(s):  
G. G. Meyerhof ◽  
A.S. Yalcin
Keyword(s):  
Bearing Capacity ◽  
Ultimate Load ◽  
Offshore Structures ◽  
Ultimate Bearing Capacity ◽  
Pile Groups ◽  
Bridge Foundations ◽  
Inclined Load ◽  
Eccentric Load ◽  
Pile Cap ◽  
Load Tests

In connection with the design of offshore structures and bridge foundations, the ultimate bearing capacity of rigid piles and pile groups in clay has been determined under various combinations of eccentricity and inclination of the load varying from the vertical to horizontal directions. The results of load tests on single rigid model piles and freestanding groups are compared with theoretical estimates. The influence of eccentricity and inclination of the load on the ultimate bearing capacity can be represented by simple interaction relationships between the ultimate loads and moments and between the axial and normal components of the ultimate load. The effect of a pile cap resting on the soil in piled foundations and the influence of pile flexibility on the ultimate load are examined briefly. Key words: bearing capacity, clay, eccentric load, inclined load, pile groups, pile–soil interaction, rigid piles, ultimate load, ultimate moment.

Bearing Capacity and Mechanical Behavior Experiment on Large Diameter-Expanding Pile

2011 ◽  
Vol 243-249 ◽  
pp. 457-460
Author(s):  
Jian Qing Jiang
Keyword(s):  
Bearing Capacity ◽  
Ultimate Load ◽  
Load Transfer ◽  
Large Diameter ◽  
Foundation Engineering ◽  
Loading Test ◽  
Axial Forces ◽  
Static Loading Test ◽  
Friction Pile ◽  
Bearing Behavior

Combined with the pile foundation engineering of a super-large highway bridge, vertical static loading test of pile with expanded diameter was carried out. The pile’s load-settlement curves, axial forces of the different pile’s section and the pile-soil interaction friction were obtained from the test. The load transfer mechanism and bearing behavior of the pile with expanded diameter under vertical load were studied. The results show that the ultimate load of the testing pile is more than 6000kN. The pile-soil interaction of the pile with expanded diameter behaviors as friction pile, and the bearing capacity of the segment with expanded diameter accounts for 40% of the ultimate load. These studies provide important references for similar projects.

Experiment and Theory Study on Ultimate Bearing Capacity of Reinforced Concrete Tubular Hollow Continuous Slab

2012 ◽  
Vol 204-208 ◽  
pp. 782-785
Author(s):  
Zhen Hao Zhang ◽  
Wei Jun Yang ◽  
Zhi Gang He
Keyword(s):  
Bearing Capacity ◽  
Ultimate Load ◽  
Complete Solution ◽  
Hollow Structure ◽  
High Strength ◽  
Internal Force ◽  
Ultimate Bearing Capacity ◽  
Thin Wall ◽  
Continuous Slab ◽  
Plastic Limit Analysis

The tubular hollow slab inside which GBF high-strength thin-wall pipes are placed is a new type of hollow structure. First the ultimate bearing capacity of tubular hollow continuous slab is measured by experiment. Then the ultimate bearing capacity of the tubular hollow continuous slab is studied by plastic limit analysis method. And the complete solution of structural ultimate load under condition of full internal force redistribution is solved. The study show that the measured values of ultimate load are all a little larger than the theoretical values of ultimate load, which shows that the tubular hollow slab develop full internal force redistribution. So it can be concluded that the tubular hollow slab has fine performance of plastic internal force redistribution.

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