scholarly journals Experimental Study on Strengthening Effect Analysis of a Deteriorated Bridge Using External Prestressing Method

2021 ◽  
Vol 11 (6) ◽  
pp. 2478
Author(s):  
Sang-Hyun Kim ◽  
Jong-Sup Park ◽  
Woo-Tai Jung ◽  
Tae-Kyun Kim ◽  
Hee-Beom Park
Keyword(s):  
Prestressed Concrete ◽  
Carrying Capacity ◽  
Concrete Bridges ◽  
Strengthening Effect ◽  
Load Carrying Capacity ◽  
Design Data ◽  
Effect Analysis ◽  
External Prestressing ◽  
Load Carrying ◽  
Before And After

The external prestressing method was developed to improve the load carrying capacity of concrete bridges damaged by ageing or other external environmental factors. Therefore, it is necessary to examine the performance of the structure before and after strengthening, and verification and confirmation of the actual strengthening effect should be preceded. However, for reasons such as securing deteriorated bridges and the absence of design data, the strengthening effect of an actual bridge is rarely analyzed. Hence, in this study, the strengthening effect was verified by conducting a set of material property tests and four-point loading tests before and after strengthening of an actual bridge, which had been utilized for over 45 years. As a result, it was determined that confirming the strengthening effect before cracking is challenging due to the nature of the external prestressing method, which has an insignificant effect on the stiffness; however, the effect of increasing the crack load of the external prestressing method was experimentally verified. The result of the study is expected to contribute to the determination of the load carrying capacity and required strengthening amount when strengthening existing prestressed concrete girder bridges.

Determination of Load-Carrying Capacity of Railway Concrete Bridges According to New Guideline

2017 ◽  
Vol 738 ◽  
pp. 100-109
Author(s):  
Josef Vican ◽  
Peter Kotes ◽  
Martin Moravcik ◽  
Jaroslav Odrobinak
Keyword(s):  
Prestressed Concrete ◽  
Carrying Capacity ◽  
Additional Data ◽  
Global Analysis ◽  
Concrete Bridges ◽  
Load Carrying Capacity ◽  
Railway Bridges ◽  
Load Carrying ◽  
Real State

The handbook "Determination of load-carrying capacity of railway bridges" [1] has grown up due to updating of old Slovak guideline [2] taking into account Eurocodes. In the case of railway bridges, there are about 2300 bridges in Slovakia and about 78 % of them are from concrete or masonry. About 28 % of bridge total number is older than 77 years and about 18 % of them are even older than 100 years. Therefore, there is need to make regular inspections, recalculate them – determine of load-carrying capacity and then to decide, which of them should be repaired or reconstructed [3,4]. The paper presents general concepts and basic assumptions for determining the load-carrying capacity of reinforced and prestressed concrete railway bridges. In contrast to design of a new bridge, additional data related to existing bridge condition and its behaviour like information from regular inspections and real state of degradation can be taken into account. Special recommendation and allowances for global analysis of existing concrete superstructures for the purpose of the load-carrying capacity estimation are discussed, as well.

Hydrodynamic Lubrication of Finite Slider Bearings: Effect of One Dimensional Film Shape, and Their Computer Aided Optimum Designs

1983 ◽  
Vol 105 (1) ◽  
pp. 48-63 ◽  
Author(s):  
C. Bagci ◽  
A. P. Singh
Keyword(s):  
Numerical Solution ◽  
Carrying Capacity ◽  
Reynolds Equation ◽  
Hydrodynamic Lubrication ◽  
Load Carrying Capacity ◽  
Slider Bearing ◽  
Design Data ◽  
Slider Bearings ◽  
Load Carrying ◽  
Computer Aided

The effect of the film shape on the load carrying capacity of a hydrodynamically lubricated bearing has not been considered an important factor in the past. Flat-faced tapered bearing and the Raileigh’s step bearing of constant film thickness have been the primary forms of film shapes for slider bearing studies and design data developments. This article, by the computer aided numerical solution of the Reynolds equation for two dimensional incompressible lubricant flow, investigates hydrodynamically lubricated slider bearings having different film shapes and studies the effect of the film shape on the performance characteristics of finite bearings; and it shows that optimized bearing with film shapes having descending slope toward the trailing edge of the bearing has considerably higher load carrying capacity than the optimized flat-faced tapered bearing of the same properties. For example the truncated cycloidal film shape yields 26.3 percent higher load carrying capacity for Lz/Lx = 1 size ratio, and 44 percent higher for Lz/Lx = 1/2. The article then presents charts for the optimum designs of finite slider bearings having tapered, exponential, catenoidal, polynomial, and truncated-cycloidal film shapes, and illustrates their use in numerical bearing design examples. These charts also furnish information on flow rate, side leakage, temperature rise, coefficient of friction, and friction power loss in optimum bearings. Appended to the article are analytical solutions for infinitely wide bearings with optimum bearing characteristics. The computer aided numerical solution of the Reynolds equation in most general form is presented by which finite or infinitely wide hydrodynamically or hydrostatically lubricated bearings, externally pressurized or not, can be studied. A digital computer program is made available.

scholarly journals Experimental and Numerical Study of Seismic Performance of Precast Prestressed Concrete Frame Internal Connection

2015 ◽  
pp. 406-413
Author(s):  
Xiandong Liao ◽  
Xiang Hu
Keyword(s):  
Seismic Performance ◽  
Prestressed Concrete ◽  
Carrying Capacity ◽  
Numerical Study ◽  
Scale Model ◽  
Load Carrying Capacity ◽  
Concrete Frame ◽  
Internal Connection ◽  
Load Carrying ◽  
Precast Prestressed Concrete

The seismic performance of the internal connection of precast prestressed concrete frame was studied systematically, based on the experiment of full-scale model under low cyclic reversed loading. This study was mainly focused on failure pattern, load-carrying capacity, skeleton curves, and hysteresis curves. Furthermore, a nonlinear finite element analysis using Abaqus was carried out to study the characteristics of the internal connection of precast prestressed concrete frame. Results revealed that the damage was concentrated mainly on beam end owing to flexural action, while steel bars in the columns and stirrups in the core region remained elastic until failure occurred. The calculated value of the load-carrying capacity of the internal connection was similar to the experimental one. Present study can be referenced for the application of precast prestressed concrete frame in high seismic zones.

scholarly journals Load Carrying Capacity and Safety Check of Prestressed Concrete Rock-Shed.

1994 ◽  
pp. 83-92
Author(s):  
Yoshimi Sonoda ◽  
Nobutaka Ishikawa ◽  
Keiichiro Sonoda ◽  
Toshiaki Ohta
Keyword(s):  
Prestressed Concrete ◽  
Carrying Capacity ◽  
Load Carrying Capacity ◽  
Load Carrying

scholarly journals Double Shear Load Carrying Capacity of Kempas and GFRP Dowelled Connections

2020 ◽  
Vol 9 (3) ◽  
pp. 2820-2824
Keyword(s):  
Shear Strength ◽  
Carrying Capacity ◽  
Timber Species ◽  
Fibre Reinforcement ◽  
Shear Load ◽  
Load Carrying Capacity ◽  
Ultimate Shear Strength ◽  
Design Data ◽  
Double Shear ◽  
Load Carrying

Glass fibre reinforcement polymers (GFRP) application for reinforcement of wood, concrete and steel member is relatively becoming more variety in construction applications. Although it is possible to build large monolithic structures with composite materials, there are still several reasons for the structure to fail. One of the main reasons that contribute to this failure is the connection performance due to its function in carrying load across the structure. Thus having the right fundamental data for connection design purposes according to the specific and technological upgraded materials is very important. One of the basic methodologies in gaining the design data is through experimental double shear test which can be verified by European Yield Model (EYM) theory. Therefore, the objective of this research is to determine the load carrying capacity of double shear strength behaviour connections made of Kempas timber species as the main member and dowelled by the GFRP or the Kempas rod. The specimens were tested under the shear load with 2mm/min rate and tested until failure. From the experiment, it was found that the average ultimate shear strength of member dowelled with GFRP rod is 21.36% higher compared to one doweled with Kempas rod. According to mode of failure between two types of bolt, GFRP dowelled performs well (Mode I& IV) rather than Kempas dowelled (Mode IV).

The Application of CFRP Reinforcement Scheme in a Overpass Bridge Reinforcement Engineering

2013 ◽  
Vol 753-755 ◽  
pp. 520-524
Author(s):  
Xin Zhao
Keyword(s):  
Stress State ◽  
Carbon Fiber ◽  
Carrying Capacity ◽  
Shear Load ◽  
Load Carrying Capacity ◽  
Flexural Capacity ◽  
Reinforcement Scheme ◽  
Load Carrying ◽  
Before And After ◽  
Carbon Fiber Polymer

Taking a flyover as the background, this paper compares two reinforcement scheme, and ultimately chooses the paste carbon fiber polymer method to reinforce the bridge. It calculates and analyzes the structure before and after the reinforcement, then compares the stress state , shear load-carrying capacity and flexural capacity. At last ,it evaluates the effect of the paste carbon fiber polymer method and puts forward some suggestions.

scholarly journals MECHANICAL PROPERTIES OF AN ALFISSOL SUBMITTED TO AGRICULTURAL MACHINERY TRAFFIC IN A SEMIARID REGION IN BRAZIL - DOI: 10.13083/1414-3984.v22n06a05

2014 ◽  
Vol 22 (6) ◽  
pp. 543-551
Author(s):  
Renildo Luiz Mion ◽  
Virginia Pires Pereira ◽  
Webert Alan Sombra ◽  
Karla Lúcia Batista Araújo ◽  
Silvia Ferreira da Silva
Keyword(s):  
Water Content ◽  
Carrying Capacity ◽  
Soil Samples ◽  
Semiarid Region ◽  
Load Carrying Capacity ◽  
Ground Contact ◽  
Inflation Pressure ◽  
Load Bearing Capacity ◽  
Load Carrying ◽  
Before And After

The load carrying capacity of the soil can be determined from preconsolidation curves, being sensitive to the variation of loads and extremely sensitive to changes in soil moisture. For this study, the water content in soil was 2.50% and 10.58% for the layer from 0 to 0.15 m. Soil samples were collected before and after traffic with one and two passes of a tractor weighing 7100 kg, equipped with 14.4-24 R1 bias tires on the front with inflation pressure of 82.74 kPa and 18.9-34 R1 rear tires with inflation pressure of 96.53 kPa, and a tire ground contact area of 0.11 m2 and 0.13 respectively for the front and rear tires. The speed at the time of the pass for each treatment was 2.22 m s-1. Regardless of the soil water content, the load carrying capacity increases with the traffic of machines due to reduction of voids. Preconsolidation curves should be used with caution due to the use of samples for determining the points in saturated conditions, and when recommended for load-bearing capacity, unsaturated samples should be used.

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