Load Test Analysis of Long-Span Prestressed Concrete Continuous Beam Bridge

2014 ◽  
Vol 1030-1032 ◽  
pp. 798-801
Author(s):  
Hua Su
Keyword(s):  
Bearing Capacity ◽  
Prestressed Concrete ◽  
Highway Bridges ◽  
Load Test ◽  
Beam Model ◽  
Test Analysis ◽  
Single Beam ◽  
Long Span ◽  
Continuous Beam Bridge ◽  
Girder Bridge

This paper takes a 45+60+45m prestressed concrete continuous box Girder Bridge as background, based on “Specification for Inspection and Evaluation of Load-bearing Capacity of Highway Bridges” (JTG/T J21-2011), single beam model and solid model are built for schematic design of load test. Compare the measured value and the theoretical value, and evaluate the bridge bearing capacity, finally provide technical base for project checking and accepting.

Study on Crack Causes and Strengthening Measures of Large Span PC Continuous Box Girder Bridges

2010 ◽  
Vol 163-167 ◽  
pp. 3551-3554
Author(s):  
Wei Peng ◽  
Zhi Xiang Zha
Keyword(s):  
Prestressed Concrete ◽  
Load Test ◽  
Box Girder Bridges ◽  
Element Analysis ◽  
Box Girder ◽  
Girder Bridges ◽  
Long Span ◽  
Concrete Box Girder Bridges ◽  
Girder Bridge ◽  
Engineering Projects

This template Based on cracks observation and finite element analysis of real engineering projects as well as bridge load test after reinforcement, causes and types of cracks in prestressed concrete box girder bridges and treating measurements are systematically studied. The results obtained from the calculation are presented to demonstrate the effect of sensitive factors, such as arrangement of longitudinal prestressed tendons, the magnitude of vertical prestressed force, temperature gradient, etc. The results show that the arrangement of longitudinal prestressed tendons and the magnitude of vertical prestressed force take key roles in cracks control of box girder webs. Lots of treating measurements are presented in accordance with different types of cracks, some of them are applied to a reinforcement engineering of a long span pretressed concrete continuous box girder bridge with cracks. Load test after reinforcement of the bridge demonstrates the reasonability of the treating measurements. Several design recommendations and construction measures about reinforcements and some sensitive factors mentioned above are proposed to control cracks.

Single Beam Load Test of Continuous Beam

2014 ◽  
Vol 578-579 ◽  
pp. 801-804
Author(s):  
Ya Xun Yang ◽  
Wei Ya Fan
Keyword(s):  
Prestressed Concrete ◽  
Static Load ◽  
Load Test ◽  
Static Load Test ◽  
Box Girder ◽  
Single Beam ◽  
Control Section ◽  
Design Requirements ◽  
Girder Bridge ◽  
Actual Control

GengYuHe bridge was a prestressed concrete continuous box girder bridge,based on the static load test of single beam bridges compared with theoretical calculation value,check whether the actual control section stress of the bridge are in conformity with the design requirements,and give advice.

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>

Experiment Study on Mechanical Characteristics Box Girder Bridge Considering Deck Pavement

2011 ◽  
Vol 90-93 ◽  
pp. 1216-1219
Author(s):  
Yan Zeng ◽  
Guang Bin Zhang ◽  
Zhi Yong Wang
Keyword(s):  
Bearing Capacity ◽  
Work Performance ◽  
Mechanical Characteristics ◽  
Load Test ◽  
Experiment Study ◽  
Box Girder ◽  
Bonding Performance ◽  
Girder Bridge ◽  
Test Result ◽  
Actual Stress

In order to understand the mechanical characteristics of shenqiu Zhidian Bridge considering the influence of pavement, On the basis of installing steel mesh in rigid bridge or consecution to enhance the bonding performance between the pavement and girder, the load test is conducted. According to the test result and the calculations result the bearing capacity and work performance of bridge are evaluated. The results show that in the design of bridge, by enhancing the bonding performance between the pavement and girder, considering the overlaid pavement participating in force corresponds with the actual stress structure.

scholarly journals Seismic Behavior of Shear Connectors of Steel Vierendeel Sandwich Plate

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
Lan Jiang ◽  
Kejian Ma ◽  
Huagang Zhang ◽  
Qin Wu ◽  
Hongna Lu ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Failure Modes ◽  
Load Test ◽  
Flexion Deformity ◽  
Test Analysis ◽  
Shear Connectors ◽  
Floor Structure ◽  
New Type ◽  
Scale Test ◽  
Energy Dissipation Coefficient

As a new type of floor structure, steel vierendeel sandwich plates are widely applied in large-span buildings with multiple storeys. Shear connectors are important stressed members of such plates. To evaluate the seismic performance of the shear connectors, a full-scale test piece in two different connection forms, namely, A and B, is designed and tested under alternating load. Test analysis of the two connection specimens covers the failure modes, hysteresis curves, and main parameters (e.g., bearing capacity, ductility, stiffness degradation, and energy dissipation coefficient). The following results concerning type A connection are obtained: First, it exhibits good ductility and long yielding platform; second, elastoplasticity of steel is fully exerted with it; third, it absorbs and dissipates energy well with strong energy consumption; and fourth, when failure occurs, cracks usually happen in the heat-affected zone of the weld in the core zone. The following conclusions about type B are drawn: first, it has large bearing capacity with high stiffness; also, when failure occurs, the ribbed stiffeners crack and flexion deformity happen.

Experimental Studies on Bearing Capacity of Post-Tensioned Unbonded Prestressed Concrete Hollowed Floors

2011 ◽  
Vol 368-373 ◽  
pp. 159-163 ◽  
Author(s):  
Xiao Hua Yang ◽  
Chao Yang Zhou ◽  
Xue Jun He ◽  
Zhi Qing Yang
Keyword(s):  
Bearing Capacity ◽  
Prestressed Concrete ◽  
Plastic Hinge ◽  
Experimental Studies ◽  
Load Test ◽  
Test Results ◽  
Three Stages ◽  
Hinge Model ◽  
Good Agreement ◽  
Post Tensioned

A 1/4 scales four-storey model of post-tensioned unbonded prestressed concrete hollow slab-column structure has been made to do the ultimate load test on the second-storey floor. By measuring the floor deflection, stresses of steel bars and cracks of floors, the bearing capacity of floor is explored. The bearing capacity tests of floor are divided into three stages: elastic stage, crack growth stage and destruction stage. Based on the test results and crack developments in floor, a improved plastic hinge model is carried out to predict the ultimate loads. The calculated results of the ultimate loads with improved plastic hinge model are in good agreement with the experiment data.

Deflection Control Method Study of Long-Span PC Continuous Rigid-Frame Highway Bridge Compared with Railway Bridge

2014 ◽  
Vol 638-640 ◽  
pp. 933-936
Author(s):  
Xun Wu ◽  
Jian Jun Yue ◽  
Xian Zheng Huang
Keyword(s):  
Prestressed Concrete ◽  
Control Method ◽  
Highway Bridges ◽  
Highway Bridge ◽  
Railway Bridge ◽  
Railway Bridges ◽  
Long Span ◽  
Rigid Frame ◽  
Stress States

Down-deflection of long-span prestressed concrete (PC) continuous rigid-frame bridges in highway is more serious than in railway. Deflection comparison of highway bridges and railway bridges can provide a reference for the deflection control of highway bridges. Differences of highway and railway design codes about deflection were firstly analyzed. Then, the whole construction processes of a highway bridge and a similar span railway bridge were simulated by Midas/Civil. Both the stress state and long-term deformation were compared. The results show that stress states of the railway bridge will reduce the down-deflection. Finally, for highway bridges, we propose the compressive stress at upper edge of pier-top section should be slightly larger than that at lower edge during the layout of prestressed tendons.

scholarly journals Research on the evaluation method of bearing capacity of existing Bridges based on dynamic load test

2021 ◽  
Vol 233 ◽  
pp. 03020
Author(s):  
Qingcheng Yang ◽  
Yufeng Ning ◽  
Weiwei Sun ◽  
Shunchao Cheng
Keyword(s):  
Bearing Capacity ◽  
Dynamic Load ◽  
Prestressed Concrete ◽  
Evaluation Method ◽  
Load Level ◽  
Load Test ◽  
Dynamic Strain ◽  
Rigid Frame ◽  
Dynamic Load Test ◽  
Impact Coefficient

The author carried out dynamic load test research on a prestressed concrete rigid frame bridge. Under dynamic load, the ratios of the measured and theoretical frequencies of the first four vertical vibrations of the bridge were 1.081, 1.153 respectively. The corresponding measured damping ratios are 0.011, 0.010 respectively. The maximum dynamic coefficient of bridge sports car test is 1.049, and the corresponding dynamic strain increment coefficient is 0.059. The measured impact coefficient is between 0.012 and 0.049, which is basically equivalent to the design impact coefficient of 0.05.The test results show that the existing bridge works well under the test load, and the bearing capacity of the structure meets the requirements of the design load level.

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