Papers by Keyword: Steel Reinforced Concrete

Abstract: The aim of the work was to determine the possibility of not taking into account the orientation (vertical or horizontal) of the studied elements of steel-reinforced concrete slabs with a corrugated profile during their heating in a modular small-sized fire furnace. The work investigated the temperature distributions on the outer surface of the corrugated ceiling profile of a steel-reinforced concrete slab of horizontal orientation simulated in the fire furnace chamber. To create geometric models of the fire furnace chamber and the studied element, a CAD software complex was used. To solve the heat engineering problem, mathematical (numerical) methods were used, based on solving systems of differential equations of continuous media such as the Navier-Stokes equation and the Fourier heat conductivity equation. According to the results obtained, the temperature distribution on the outer surface of the steel profile of the reinforced concrete slab is uniform, the temperature deviation in different places on the surface does not exceed 7 %. The maximum temperature on the heating surface of the steel profile of the reinforced concrete slab in the last minute of computer simulation reached 921 °С and the average temperature at this time over the entire surface of the structure was 917 °С. To determine the appropriate orientation of the test sample during fire tests, a comparison of the obtained temperature distributions on the outer surface of the corrugated profile of a horizontally placed reinforced concrete slab with the temperature distributions on the outer surface of the corrugated profile of a vertically placed reinforced concrete slab, which were given in the previous work was made. Analysis of the average surface temperatures of the corrugated profile of a reinforced concrete slab of horizontal and vertical orientation showed that the temperature distribution over the surface of the profile was uniform in both cases and the results obtained show good reproducibility of the experiment during computer simulation. And the orientation of the tested elements does not affect the temperature distribution over the outer surface of the corrugated profile of a reinforced concrete slab in the simulated furnace.

Abstract: In the article, the results of experimental researches of elements of structural steel reinforced slabs are presented. And the particularities of the work of structural designs under load are identified.

Abstract: Prediction of time-to-cracking and crack-width of concrete cover provides useful information for decision making on maintenance and rehabilitation of reinforced concrete structures. Comparison of prediction models for time-to-cracking has been done in a recently published study, which indicated simple prediction models provide better good fit to various sets of experimental data than complex models. As a follow-up, this study uses published crack-width data to compare different models, developed in the literature to predict crack-width of concrete cover.

Abstract: Application of a very wide range of engineering and construction of concrete beam, generally by the concrete and steel components, plays an important role in civil engineering. The unit adopts the structure of what will maximize the load, is the key problem in the design of concrete beam. This paper analyzes the structural characteristics of the Steel Reinforced Concrete and the bearing capacity, the design of a new type of structure. Application of ANSYS software to carry on the numerical simulation to it, and the concrete materials with different strength grades were bearing contrast; through continuous optimization of steel and concrete structure, complete the optimal combination between material, find Steel Reinforced Concrete structure best, and eventually realize the reasonable design of concrete beam.

Abstract: As one of the forms of composite structure system,the steel reinforced concrete(SRC) frame structure has the advantages of high carrying capacity and excellent elastic - plastic.The SRC has been widely used in high-rise structures and bridges. Meanwhile, it has promising application prospects in industrial plant construction. However, there are not many researches on the entity SRC structure in China at present, and many issues need to be explored. In this paper, we will give suggestions of application in the SRC industrial main plant , during designing of SRC frame structure in Daqing city, Heilongjiang province.

Abstract: Steel Reinforce Concrete Beam (SRCB) has a better flexural strength and excellent performances of ductility and seismic resistance in contrast to reinforce concrete beam.Six SRCB have been done with different compressive strength of concrete,rebar ratio,rebar cover thickness and steel cover thickness. The paper analyses the character of deflection and crack development process in following aspects: the development of maximum width and average width of crack, the law between strain of rebar and steel with the width of crack and the crack closing character. Experimental study indicates that the deflection and crack development can be devided into three stages. SRCB with reasonable rebar and H-section steel arrangement manner has excellent serviceable performance,such as deflection, resistance to crack, crack width and crack closing performance.

Abstract: Taking the optimization of steel reinforced concrete frame structure as background, the searching and optimizing of structural were taken as optimization objectives by introducing failure modes. Incremental dynamic analysis (IDA) was used to search the seismic wave, which had important significance of the structure, thus, the failure modes under the seismic waves could be obtained. And three optimization methods were proposed. Finally, an example was analyzed to verify the rationality of the proposed optimization thought and method.

Abstract: Through the experimental test, influences of axial compression ratio on seismic ductility of SRC columns are analyzed. The limit values of axial compression ratio of the columns are obtained, corresponding to different stirrup ratios at a certain level of displacement ductility.

Abstract: Monitoring the condition of steel corrosion in reinforced concrete (RC) is imperative for ensuring structural serviceability and durability of RC structures. The techniques based on ultrasonic guided wave (UGW) gain more and more popularities as they have many advantages for monitoring corrosion in reinforced concrete. In this paper, UGW based monitoring techniques in the past decade are reviewed, including corrosion monitoring mechanism and feature extraction, monitoring corrosion induced deboning, monitoring pitting corrosion, monitoring corrosion induced interface roughness. Finally, the challenges and future trends in the development of UGW based monitoring techniques for condition assessment of corrosion inreinforced concrete are put forward in this paper.

Abstract: It is imperative to develop effective techniques to monitor the condition of steel corrosion in reinforced concrete (RC) for ensuring structural serviceability and durability. In the past decade, some physical based techniques have been proposed as alternative tools for monitoring corrosion. These physical based monitoring techniques can conduct accurate condition assessment of steel corrosion through direct measurements on embedded steels. In this paper, some primary physical based monitoring techniques for condition assessment of steel corrosion in reinforced concrete in the recent years are presented and the challenges and future trends in the development of physical based monitoring techniques for condition assessment of corrosion in reinforced concrete are also put forward.