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The strength tests of 7 wooden columns were carried out to understand the service-beyond wooden members and their residual strength. Six of these specimens were reinforced with GFRP and the other one was not. The results show that the ultimate load, ductility and lateral stiffness of reinforced columns are significantly improved. Moreover, the improvement of the performances is closely related to...
The contrast experiments between 8 lightweight aggregate concrete entity beams and 4 common concrete entity beams are compared and failure modes are studied. The research indicates that the cracking moment for lightweight aggregate concrete of the same strength grade are slight larger than ordinary concrete beams . Aggregate categories have a little influence on the cracking moment. The cracking moment...
This paper presents a research on a simplified applied method for shear bearing capacity of externally prestressed concrete beams. According to shear failure process of externally prestressed concrete test beams, limited balanced method for shear bearing capacity of externally prestressed concrete beams is deduced, and failure strength criterion for concrete zone under shear and compression of externally...
Bond-slip relationship is very complex issue in the non-linear finite element analysis of beams. Three model beams with different bond length were constructed to study the mechanical properties. Based on the geometric parameters of the model beam as well as bond-slip curve obtained from experiments by former scholars, this paper has simulated the bond-slip relationship between steel bars and concrete...
Experiments of the fire-resistance and static loading tests before and after fire were carried out to study the mechanical behaviors of simple-supported reinforced ceramsite concrete beams. Compared with the beams before fire, the bending and shear capabilities of beams after fire all reduced in different degrees. The nonlinear FEM simulation was done for the bending experiment of the beam before...
To study mechanical properties and impact on components for existing concrete of different service life, uniaxial compression tests for existing un-carbonated concrete serviced 10, 20, 40 years respectively were carried out, and 14 complete stress-strain curves were obtained. Test results showed that The mechanical properties on elastic modulus, ductility, peak strain, ultimate strain and transverse...
This paper presents the mechanism production of the secondary moments of prestressed continuous beam. Generally, the prestressed secondary moments are calculated by subtracting the primary moments from the result moments, which involves extensive calculations. Based on the moment area method and deformation compatibility principle, the second moments can be figured out directly and simply and the...
In the earthquake, the beam-column joints with adequate strength and deformation is the key point to guarantee the overall seismic performance of the frame structures. View of their key role in the frame, it is necessary to systematically analysis on the shear strength. Based on the collection of test results on the seismic performance of the joints during the past few decades, the main factors, such...
This paper is present a review on the evaluation of concrete structure damage by utilizing the moment tensor analysis (MTA) of acoustic emission (AE) source technique. In general moment tensor analysis is concerning the quantitative information on kinematics of cracks according to the AE source. This concept of AE analysis has been developed and mostly applied in reinforced concrete structure. Furthermore,...
In the bridges' entire life cycle, it is inevitable for bridges to be degraded and damaged because of the environmental factors and the conditions of usage. Taking more than 1500 concrete bridges in Beijing as the background projects, it is summarized that the typical diseases, the manifestations of functional damages and structural damages of concrete bridges. Among them, the functional injury accounted...
Eight simply supported dry-mixed self-compacting concrete (DSCC) beams and two normal concrete beams were tested and flexural behavior of the tested DSCC beams (including deflection, strain and crack) were studied. The results showed that water ratio and coarse aggregate ratio played important role in deformation performance and bearing capacity of flexural members. Deflection and maximum crack width...
Employing a case of Ningxia TV Tower (NXTVT) as the background, the three-dimensional (3D) finite element model of NXTVT is established by resorting to SAP2000 software. The shape of NXTVT resembles a small bottom, large top, and slender-waist-middle vase. Likewise, its floors are arranged discontinuously, thus leading to the uneven distribution of the structural mass and stiffness. Hence, there is...
Eight simply supported dry-mixed self-compacting concrete (DSCC) beams and two normal concrete beams were tested and flexural behaviors of the tested DSCC beams were studied besides failure characteristics. When water ratio and coarse aggregate ratio are appropriate, based on the experimental results DSCC beams also have the failure process, including elastic, cracking, yield and ultimate point in...
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