Crack Behaviour of Retrofitted Pre-Tensioned Concrete Beam

2015 ◽  
Vol 752-753 ◽  
pp. 605-609
Author(s):  
Nurul Huda Suliman ◽  
A. Abu Bakar ◽  
Siti Hawa Hamzah ◽  
Norzahiah Shahar
Keyword(s):  
Critical Load ◽  
Concrete Beam ◽  
Static Load ◽  
Load Capacity ◽  
Maximum Load ◽  
Load Test ◽  
Static Load Test ◽  
Structural Durability ◽  
Before And After ◽  
Maintenance Process

Crack is a common cause of the degradation of concrete and may affect its structural durability. In order to ensure the bridge is safe utilized in anticipated period of their future service, a proper maintenance process and procedure should be taken. Therefore in this study, static load test were performed on a pre-tensioned (PRT) concrete beam to investigate crack behaviour before and after retrofitting process as well as to determine the effectiveness of the retrofitting method. A control beam named PRTB1 will fully loaded until fail to determine its maximum load capacity and critical load of the beam. Hence another beam named PRTB-FRP will be loaded until it reached it critical load capacity before retrofitted using Fiber Reinforced Polymer (FRP) plates located beneath the centre of the beam. After the retrofitting process PRTB-FRP will be put again under the static load. The load capacity of PRTB-FRP increased compared to PRTB1 with some improvement in crack propagation behaviour after retrofitted.

scholarly journals Static load test curve (Q–s) conversion in to pile of different size

2018 ◽  
Vol 50 (2) ◽  
pp. 171-182
Author(s):  
Zygmunt Meyer ◽  
Kamil Stachecki
Keyword(s):  
Mathematical Description ◽  
Static Load ◽  
Load Capacity ◽  
Limit Load ◽  
Load Test ◽  
Static Load Test ◽  
Load Curve ◽  
Load Tests ◽  
Different Diameters ◽  
Calculation Analysis

Abstract In the work authors analysed possibility of obtaining static load tests curve for a pile in case of changed diameter, using load curve based on results of static load tests for given diameter. In calculation analysis authors used Meyer–Kowalów (M-K) method. A mathematical description was shown of determining new M-K curve for a pile with changed diameter, taking as a basis original M-K curve obtained from static load tests. Then an example of calculations is presented in which parameters of M-K model for a new curve were determined. Simulation calculations were carried out in the original computer program, the results of which includes load curves for piles with different diameters and relations between diameter changes, limit load capacity and settlement of a pile.

Strengthening Experiment of a Hollow Slab Bridge by External Transverse Prestressing

2011 ◽  
Vol 243-249 ◽  
pp. 1561-1566
Author(s):  
Fu Ming Wang ◽  
Sheng Zhen Kang ◽  
Xiao Long Li ◽  
Ying Chun Cai
Keyword(s):  
Static Load ◽  
Load Test ◽  
Strengthening Effect ◽  
Construction Technology ◽  
Test Results ◽  
Static Load Test ◽  
Hinge Joint ◽  
External Prestressing ◽  
Before And After ◽  
Strengthening Method

For hollow slab bridge, its concrete hinge joint is prone to be damaged under overload vehicles, as weakens the transverse integrity of bridge, leads to single slab bearing and threatens the safety of service. Aiming at the problem, a strengthening experiment of an actual concrete hollow slab bridge, which has experienced a destructive test with its transverse connections seriously damaged, was performed by applying external transverse prestressing to it. The strengthening design and construction technology of external prestressing were introduced. By means of truck static load test, the variation of deflections and strains of the bridge before and after strengthening under different tension force was obtained, and the influence of tension value to strengthening effect was emphatically analyzed. The test results proved the effectiveness of the strengthening method and some improvement suggestions were also presented.

Research on the Effect of Injury Beams Strengthened with Carbon Fiber Reinforced Polymer (CFRP) of the Unloading Degree

2010 ◽  
Vol 163-167 ◽  
pp. 3713-3717
Author(s):  
Shao Wei Zhao ◽  
Shi Feng Fu ◽  
Zeng Zhao Xu
Keyword(s):  
Carbon Fiber ◽  
Concrete Beam ◽  
Static Load ◽  
Reinforced Concrete Beam ◽  
Load Level ◽  
Load Test ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Static Load Test ◽  
Reinforced Polymer

The static load test is done on 5 concrete beams. One beam is loaded to the destruction as a contrast specimen, and the other 4 are loaded to the predetermined damage load (80kN), then unloaded to the different load level separately, keeping the load invariable, and tested the improvement in flexing resistance after structural strengthening by CFRP.The research indicates: The ultimate capabilities of the reinforced concrete beam specimens reinforced by carbon fiber sheets can increase 20.93%~39.80% compared with the specimen without CFRP.

The Comparison of Pile Load Capacity Based on the Results of Analytical Calculations and Static Tests

2015 ◽  
Vol 725-726 ◽  
pp. 190-194
Author(s):  
Andrey Badanin ◽  
Victor Melnikov ◽  
Darya Filippova
Keyword(s):  
Static Load ◽  
Load Capacity ◽  
Load Test ◽  
Construction Technology ◽  
Construction Site ◽  
Static Load Test ◽  
Static Tests ◽  
Saint Petersburg

The article discusses the causes of discrepancies in the values of the pile load capacity based on the results of calculations made on the basis of existing regulations and the pile load capacity after static load test on the construction site. A brief overview of the causes of discrepancies in analytical and practical values ​​of pile load capacity is provided in the article. The possible ways to solve this problem are suggested, namely, the development of the methods of analytical calculations of pile load capacity and the improvement of embedding technical processes. There is an example of such a discrepancy in the construction of a residential complex in Saint-Petersburg presented in the article. It was found that the variation in the results is not caused by the imperfections in the method of calculations, but by the infringements of construction technology. The article provides recommendations to minimize the discrepancies between the calculated and actual values of pile load capacity.

scholarly journals MODELING OF THE JACKED PILE STATIC LOAD TEST WITH PLAXIS 3D / SPAUSTINIO POLIO BANDYMO STATINE APKROVA MODELIAVIMAS PLAXIS 3D

2016 ◽  
Vol 8 (5) ◽  
pp. 495-498
Author(s):  
Tautvydas Statkus
Keyword(s):  
Building Materials ◽  
Model Building ◽  
Static Load ◽  
Load Test ◽  
Static Load Test ◽  
Model Geometry ◽  
Comparison Of The Results ◽  
3D Software ◽  
Installation Technology ◽  
Plaxis 3D

In this article jacked pile installation technology and its current processes, altering the base physical and mechanical characteristics are discussed. For the jacked pile static load test simulation Plax 3D software was selected, the opportunities and developments were described. Model building, materials, models, model geometry, finite elements, boundary conditions and assumptions adopted in addressing problems described in detail. Three different tasks formulated and load-settlement dependence a comparison of the results with the experiment given. Conclusions are formulated according to the modeling results. Šiame straipsnyje aptarta spaustinių polių įrengimo technologija ir ją taikant vykstantys procesai, keičiantys pagrindo fizines ir mechanines charakteristikas. Spaustinio polio bandymui statine apkrova modeliuoti pasirinktas PLAXIS 3D programinis paketas ir aprašytos jo galimybės bei raida. Detaliai nupasakotas modelio kūrimas, medžiagų modeliai, modelio geometrija, baigtiniai elementai, kraštinės sąlygos ir priimamos prielaidos sprendžiant problemą. Suformuluoti trys sprendžiami uždaviniai ir apkrovos bei nuosėdžio priklausomybe pateikiamas rezultatų palyginimas su eksperimentu. Atsižvelgiant į modeliavimo rezultatus suformuluotos išvados.

Static Load Test of Frame-Structure Slab

2013 ◽  
Vol 790 ◽  
pp. 227-230
Author(s):  
Jian Feng Su ◽  
Yu Feng Xu
Keyword(s):  
Carrying Capacity ◽  
Static Load ◽  
Load Test ◽  
Frame Structure ◽  
Test Results ◽  
Static Load Test ◽  
Important Method ◽  
Floor Slab ◽  
Testing Scheme

Floor slab static load test is a important method to judge the performance and carrying capacity of the slab. This paper, with the background of a factory frame-structure slab, introduced the testing scheme, the details of the testing process as well as the test results. The testing cases provide a useful reference for the same type of project.

scholarly journals Comparison of Numerical Analyses with a Static Load Test of a Continuous Flight Auger Pile

2014 ◽  
Vol 22 (4) ◽  
pp. 1-10 ◽  
Author(s):  
Michal Hoľko ◽  
Jakub Stacho
Keyword(s):  
Load Distribution ◽  
Static Load ◽  
Numerical Models ◽  
Load Test ◽  
Numerical Analyses ◽  
Static Load Test ◽  
Material Models ◽  
The Common ◽  
Constitutive Material ◽  
The Impact

Abstract The article deals with numerical analyses of a Continuous Flight Auger (CFA) pile. The analyses include a comparison of calculated and measured load-settlement curves as well as a comparison of the load distribution over a pile's length. The numerical analyses were executed using two types of software, i.e., Ansys and Plaxis, which are based on FEM calculations. Both types of software are different from each other in the way they create numerical models, model the interface between the pile and soil, and use constitutive material models. The analyses have been prepared in the form of a parametric study, where the method of modelling the interface and the material models of the soil are compared and analysed. Our analyses show that both types of software permit the modelling of pile foundations. The Plaxis software uses advanced material models as well as the modelling of the impact of groundwater or overconsolidation. The load-settlement curve calculated using Plaxis is equal to the results of a static load test with a more than 95 % degree of accuracy. In comparison, the load-settlement curve calculated using Ansys allows for the obtaining of only an approximate estimate, but the software allows for the common modelling of large structure systems together with a foundation system.

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