STRESS STATE OF THE WEB OF REINFORCED CONCRETE I-BEAMS SUBJECTED TO TRANSVERSE BENDING

EPMESC VII ◽  
1999 ◽  
pp. 647-656
Author(s):  
Syuji Nakano
Author(s):  
Sarah Jane Blick ◽  
Chris West

Tame Valley Viaduct is a 620m long multi-span highway structure linking Birmingham city centre to the M6 motorway. An assessment in 2004 found the capacity of the structure to be inadequate for current loading, resulting in a requirement for strengthening. Before strengthening works were designed, a comprehensive, refined re-assessment of the structure was undertaken to fully define which areas needed strengthening and which did not. The composite structure comprises a reinforced-concrete slab and typically four longitudinal steel box girders. Each of these longitudinal girders comprises approximately 600 sets of web and flange panels. The scale of the task required automation of the assessment and design process. This paper discusses how the automation was undertaken including the preparation of models to calculate individual panel loading, assessment of the web and flange panels, and the checking of strengthening solutions.


2017 ◽  
Vol 737 ◽  
pp. 441-447 ◽  
Author(s):  
Stefanus Kristiawan ◽  
Agus Supriyadi ◽  
Senot Sangadji ◽  
Hapsara Brian Wicaksono

Degradation of reinforced concrete (RC) element could lead to a reduction of its strength and serviceability. The degradation may be identified in the form of spalling of concrete cover. For the case of RC beam, spalling of concrete cover could occur at the web of the shear span due to corrosion of the web reinfocements. The shear strength of the damaged-RC beam possibly will become less conservative compared to the corresponding flexural strength with a risk of brittle failure. Patch repair could be a choice to recover the size and strength of the damaged-RC beam. This research investigates the shear failure of patched RC beam without web reinforcements with a particular interest to compare the shear failure behaviour of patched RC beam and normal RC beam. The patch repair material used in this research was unsaturated polyester resin (UPR) mortar. The results indicate that the initial diagonal cracks leading to shear failure of patched RC beam occur at a lower level of loading. However, the patched RC beam could carry a greater load before the diagonal crack propagates in length and width causing the beam to fail in shear.


2012 ◽  
Vol 517 ◽  
pp. 928-931
Author(s):  
Yan Min Yang ◽  
Xiao Juan Xie

The steel roof truss rod is widely used in Chinese building industrue, because of the reasonable force, the design and simple construction, the good economic indicators, attractive appearance and many other advantages. Based on a pin 24m steel roof truss static test research and the results, which is based on the rigid and hinged to calculate, show that the steel roof truss which has the property that the web member axis intersection point and the chord member centroid are coincident, is in a good agreement according the calculation of rigid or hinge compared with the actual stress state.


Author(s):  
Юрий Владимирович Немировский ◽  
Сергей Владимирович Тихонов

В работе рассматриваются многослойные бетонные стержни постоянного поперечного сечения армированные стальной арматурой. Предполагается, что в стержне имеет место одноосное напряженное состояние. На примере армирования сталями марок А240, А400, А800 показано влияние степени армирования на несущую способность стержня. Рассматриваются случаи армирования как только одного из слоев стержня, так и армирование всех слоев одновременно. The paper deals with multilayer concrete rods of constant cross-section reinforced with steel reinforcement. It is assumed that there is a uniaxial stress state in the bar. Using the example of reinforcement with steels of grades A240, A400, A800, the influence of the degree of reinforcement on the bearing capacity of the bar is shown. Cases of reinforcement of both only one of the layers of the bar and reinforcement of all layers at the same time are considered


Vestnik MGSU ◽  
2019 ◽  
pp. 1121-1131
Author(s):  
Kristina I. Zarakovskaya ◽  
Vladimir F. Zakharov

Introduction. Considering that reinforced concrete is the most common material in construction and reconstruction of buildings and facilities, research of work of high-strength reinforcement in reinforced concrete elements, including compressed columns, are still relevant at present. Analysis of compound-section columns with high-strength longitudinal reinforcement is of particular interest since the method of sectional build-up is widespread enough in the reconstruction of buildings and facilities. However, no information on the work of this kind of reinforced concrete structures under long-term compression was found either in foreign or domestic literature; this fact provides relevance and academic novelty of the study. Materials and methods. The article provides the research of parameters of the strain-stress state of compound reinforced concrete bars with high-tensile reinforcement under long time compression employing the modern methods of mathematical simulation. Results. The developed calculation method allows determining additional parameters of the strain-stress state of the compressed compound-section reinforced concrete bars considering the concrete creep deformations forming in time of the long-term compression. When comparing the analytical study results with authors’ experimental data and previous results of other researchers, an adequate degree of reliability of the developed calculation method was confirmed. Conclusions. When applying the developed calculation method of stress-deformation state parameters for the compressed compound-section columns with high-strength longitudinal reinforcement, the study discovered that significant effort redistribution from concrete to high-strength reinforcement occurs under long-term compression. This fact was confirmed with the results of an experimental investigation on the resistance of the compound reinforced concrete bars with high-tensile reinforcement to the longtime compression.


Ferrocement is the composite of Ferro (Iron) and cement (cement mortar). Ferrocement can be considered as a type of thin-walled reinforced concrete construction in which small-diameter wire meshes are used uniformly throughout the cross-section instead of discretely placed reinforcing bars and in which Portland cement mortar is used instead of concrete. In this investigation, 23 reinforced concrete Tee beams were tested for their flexural strength. Three sets of Tee beams were predamaged up to 60, 70, and 80 percent of the ultimate load level of control beams respectively. Beams pre-damaged up to 60% are designated as W1 and F1. Similarly 70% as W2 and F2 and 80% as W3 and F3. Two beams are undamaged, but they are strengthened are designated UW and UF. UW, W1, W2 and W3 set (3 beams in each set) of beams were strengthened with three faces of the web using ferrocement. UF, F1, F2 and F3 set (3 beams in each set) of beams were strengthened with three side faces of the web + bottom of the flange using ferrocement. After proper curing, all the strengthened beam specimens were tested for their flexural strength. The results were compared with corresponding control beams and presented. From the experimental investigation, it is seen that the ultimate Flexural strength capacity of Reinforced concrete Tee beams strengthened with ferrocement is significantly increased.


2019 ◽  
Vol 196 ◽  
pp. 109280
Author(s):  
Javier Pereiro-Barceló ◽  
José Antonio López-Juárez ◽  
Salvador Ivorra ◽  
José L. Bonet

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