Papers by Keyword: T-Beam

Abstract: Through the investigation, detection, analysis and study of cracks in concrete beam and concrete floorslab of a residential project in Shandong Province, this paper aims to determine the cracks type and the causes, and assess the impact on the project. Then, the appropriate and corresponding schemes for handling concrete cracks will be developed and for similar projects, this paper proposes some reasonable suggestions as well.

Abstract: The prestressed composite T beam with concrete-filled steel tube is made through welding with half I-beam to connect the concrete-filled circular steel tube. The prestressed reinforcement was equipped on the T-beam. The load-bearing capacity and rigidity of the composite beam was enhanced by using prestressed force. In consideration of applying prestress, the corresponding parts stress and strain from the beginning of applying prestress to the phase of elimination of the pressure is calculated through the process of applying prestress; establish the equation of elastic flexural capacity with different location of neutral axis according to the theoretical analyses. Also use the superposition method to build the equation of the deflection. The computational results show that applying prestress reduces the deformation of the composite structure and the mechanic performance has improved which provide important theoretical basis with practical application in engineering.

Abstract: Creep age forming (CAF) is an effective process to manufacture aircraft panels with better performance including improved strength and toughness, lower weight and increased resistance to fatigue and corrosion. Due to restrictions of aging cycle to create the desired property, springback in CAF is larger than other forming processes. That makes its prediction one of the key technologies in CAF. A solution is developed to predict springback in CAF of aluminium components. The studies are mainly concentrated on the pure bending of aluminium strips. Comparisons of predictions with experimental data yield agreement. Effects of T-beam’s structural factors, like width, skin thickness, rib width and transitional radius on springback are investigated. And a relationship between geometrical data and springback is given by the proposed algorithm.

Abstract: To investigate the influence of flange and loading pattern on shear strength of reinforced concrete (RC)T-beams with high strength stirrups, a total of 12 simply supported RC T-beams subjected to concentrated and uniform load have been made. The correlative provisions suggested by Code for Design of Concrete Structures (Consultative Paper GB50010-200X) are verified by results obtained from this paper and other scholars published in literatures, recently. Then, the reliability of the suggested formula is solved by analyzing the ratio of experiment results to calculations, which shown that the method for shear strength of RC beam with high strength stirrup is safe and has a reliability of above 95%, and the formula can satisfy the engineering requirement correctly. Moreover, to keep style uniform the effect of flange on shear strength of T-beam under uniform load are ignored.,To investigate the influence of flange and loading pattern on shear strength of reinforced concrete (RC)T-beams with high strength stirrups, a total of 12 simply supported RC T-beams subjected to concentrated and uniform load have been made. The correlative provisions suggested by Code for Design of Concrete Structures (Consultative Paper GB50010-200X) are verified by results obtained from this paper and other scholars published in literatures, recently. Then, the reliability of the suggested formula is solved by analyzing the ratio of experiment results to calculations, which shown that the method for shear strength of RC beam with high strength stirrup is safe and has a reliability of above 95%, and the formula can satisfy the engineering requirement correctly. Moreover, to keep style uniform the effect of flange on shear strength of T-beam under uniform load are ignored.,To investigate the influence of flange and loading pattern on shear strength of reinforced concrete (RC)T-beams with high strength stirrups, a total of 12 simply supported RC T-beams subjected to concentrated and uniform load have been made. The correlative provisions suggested by Code for Design of Concrete Structures (Consultative Paper GB50010-200X) are verified by results obtained from this paper and other scholars published in literatures, recently. Then, the reliability of the suggested formula is solved by analyzing the ratio of experiment results to calculations, which shown that the method for shear strength of RC beam with high strength stirrup is safe and has a reliability of above 95%, and the formula can satisfy the engineering requirement correctly. Moreover, to keep style uniform the effect of flange on shear strength of T-beam under uniform load are ignored.,To investigate the influence of flange and loading pattern on shear strength of reinforced concrete (RC)T-beams with high strength stirrups, a total of 12 simply supported RC T-beams subjected to concentrated and uniform load have been made. The correlative provisions suggested by Code for Design of Concrete Structures (Consultative Paper GB50010-200X) are verified by results obtained from this paper and other scholars published in literatures, recently. Then, the reliability of the suggested formula is solved by analyzing the ratio of experiment results to calculations, which shown that the method for shear strength of RC beam with high strength stirrup is safe and has a reliability of above 95%, and the formula can satisfy the engineering requirement correctly. Moreover, to keep style uniform the effect of flange on shear strength of T-beam under uniform load are ignored.

Abstract: In order to research on the stress change and influencing factor of whole construction process of simply supported to Continuous system T-beam bridge, combined with Guizhou Bai-long bridge, the stress change is carried out the real time inspection in each construction stage, and the finite element model is established to analyse Stress changes in whole construction process. The monitoring value is ​​more consistent with the theoretical value in each stage , monitoring dates and theoretical calculations showed that pre-stressed is the main factor of stress changes in construction process.Pre-stressed tension in negative moment region has obvious influence on the stress of middle span, the stress of top and bottom plates in wet joints will be equivalent after tendons tension in negative moment Region.

Abstract: With the application of high strength concrete and rebar, the influence of concrete strength on cracking width of reinforced concrete beam with high strength rebar is becoming more and more important. To investigate the effect of concrete strength on cracking width of reinforced concrete beam with high strength rebar, the experiment including 6 simply supported T-beams with high-strength rebar and 2 beams with ordinary-strength rebar have been made. Then the relevant specifications advised in Code for Design of Concreter Structure (GB50010-2002) are revised according to the experiment results so as to considering the influence of concrete on cracking width. A new cracking width method considering the influence of concrete strength on cracking width for reinforced concrete beam with high strength rebar is proposed. Finally, the comparisons between predictions and experiment results have been conducted, which shown that the proposed new cracking width method agreed with experiment results well.

Abstract: This paper proposes a concept of layered fiber reinforced concrete (LFRC) beam. In the concept of a LFRC beam, low-modulus fiber and high-modulus fiber are randomly dispersed and uniformly distributed into the concrete matries of the compression and tension zones, respectively. The static behaviors of LFRC beam are investigated from both experimental and numerical aspects. Four-point bending tests are performed on two simply supported T-shaped LFRC beam specimens and an ordinary T-shaped RC beam specimen with large scales. Comparison between the testing results of LFRC and RC beam specimens shows that the initial cracking load, flexural toughness and post-yielding stiffness of a LFRC beam can be significantly improved, but the ultimate loads are nearly without change. Numerical simulations are also carried out to investigate the static behaviors of the LFRC beam specimens. It is found that the simulation results are agreed well with that of tests. Further numerical parameter analysis for the LFRC beam specimens is conducted. The effects of high-modulus fiber volume fraction on the static behaviors of LFRC beams are studied. The research results show that the additions of high-modulus fibers have little effect on the initial stiffness, yielding loads and ultimate loads of LFRC beams; both the load and displacement at the initial cracking point increase linearly with the increasing volume fraction of the high-modulus fiber, but both the yielding displacement and ultimate displacement decrease linearly with the increasing volume fraction of the high-modulus fiber.

Abstract: Composite T-beam in general use is composed of concrete and steel. Compared with mechanical analysis, little research has been carried on deriving the theoretical model for back analysis of composite T-beam. Firstly for composite T-beam, degraded solid element theory is deduced and the displacement function is obtained. Then Markov error function of mechanical parameters of composite T-beam is founded. The back analysis computing formulas are also obtained by adopting optimization method including revised Powell method. Then the steps of back analysis of mechanical parameters of the composite T-beam are given. Through analysis of a classic example, some important conclusions about revised Powell back analysis of mechanical parameters of composite T-beam are obtained.