This study focuses on dynamic behaviors of simply supported beams, especially, vertical displacements. Based on moving load model, the displacement is estimated by response superposition. The displacements tend to increase as load velocity increases except under resonance velocity and show very large values under resonance velocity. Therefore, we should investigate the resonance between train and structure.
In this study, the flexural test were carried out on a total eighteen reinforced concrete beams with different steel connection. From the results, reinforced concrete of not spliced showed higher ultimate loads and cracking loads than other specimens. Also the ultimate load of reinforced of parallel(tapered) threaded coupler is almost equal to that of lap spliced.
To evaluate the deformation of space frame dome structure in Daegu Athletic Center, horizontal displacements of all 32 supports and vertical deflections at 8 points are predicted through the elastic analysis. The result of a comparison with the measurement data shows that the analysis well predicts the measured horizontal displacements and vertical deflections
Test-bed site in Honam High Speed Railway is under construction for developing infra system core technology and speed-up test over 400km/h. High Speed Railway Infra System’s development are composed of comprehensive research developments which are comprising infra system such as railraod infrastructure, environmental noise reduction, catenary, train control and etc. For high speed-up, the review of track alignment, structural and running safety are required. In this paper, speed-up patterns of train by TPS and structural safety according to load variation are evaluated.
Transverse joints on upper flange of modular T-shaped girder bridge are composed of lapped splice and in-situ high strength concrete. Optimal shape induced by finite element analysis through the shape parameters.
In this study, experiments were performed in order to evaluate the concrete breakout strength of shear reinforcement considering anchorage type and embedment depth. and Using the result, we provide basic data for the design of shear reinforcement. According to the experimental results, If the concrete strength is relatively low and thin flat plate, we need a design considering the concrete breakout failure than concrete bearing failure.
In this study, tensile and axial buckling strength of corroded steel plates was evaluated based on the axially loading tests of corroded specimens, which were cut off at a temporary steel structures. The tensile and axial buckling strength of corroded specimens and non-corroded specimens could be evaluated identically by using effective thickness, which is equal to average thickness minus standard deviation of residual thickness.
For the optimized design of the wind turbine tower, demonstrate the superiority of ability to resist the lateral load on the ICH-CFT, i.e. ability to resist the moment, compared to Steel Tubular Type that is mainly used in the existing, by using P-M Diagram
Based on the yield line theory, a theoretical model to predict the ultimate strength of fiber reinforced slab-on-grade subjected to concentric load was developed. The validity of the developemd model was examined by comparing its predictions with the test results obtained from SOGs reinforced either with conventional steel fibers or amorphous steel fibers. The average ratio of the theoretical predictions to experimental results on ultimate strength was 1.06.
Deep beam is designed by flexure design method and shear provided by concrete (Vc) for deep flexure members are provided in special provisions section of 11.8 in ACI 318‐99 [1]. But in later version of ACI (after ACI 318‐99) deep beams shall be designed either by taking into account nonlinear distribution of strain or by Appendix A of Strut‐and‐Tie Models (STM). Different from ACI 318‐99, there is no specific provision of design method for deep beam. This study aims to find the different and efficiency of deep beam design based on variation of parameter compiled from many samples selected between ACI Traditional design method and Strut‐and‐Tie Models.
To establish how we can estimate the stability of traditional wood structures by using commercial structural analysis programs, it is important to calculate the stiffness of the Gong-Po. So, the estimating method of its axial stiffness is proposed on the deformation of each member which forms the Gong-Po.
In this study, the existing precise inspection reports were collected and analyzed to perform evaluation of load carrying capacity in bridge due to increase of serviced life. From this study, the evaluation method considering the difference of structural analysis and test truck according to serviced life was suggested
In order to realize these weight lightening, structure was used to high strength thin plate. If thin plate structure is used, buckling about compression is happen so we should consider buckling. Commonly, we use the girder with stiffener to prevent shear buckling but if we use corrugated web, it can be the role of stiffener to buckling This study is developed of program about optimum problem using structure design process and real-valued genetic algorithm. For the optimum design, the objective function is defined weight of sinusoidal corrugated web and conduct by optimization. The program is analyzed by example.
Recently, SC(Steel plate concrete) structure has been widely used in the design of the nuclear power plant structure because of its construction efficiency. In this study, the structural design program for SC structure was developed in accordance with KEPIC-SNG to provide optimal design condition. Especially, to reduce unnecessary simple repeat work in the design process, the design automation function was extensively included. The developed program is consist of three different design module: wall, slab, and connection design module.
The impact factor of general road bridges is typically calculated according to Korea Highway Design Code(KHDC) or Design Guidelines For Cable-Supported Bridges in Korea. Above design codes define the impact factor as the function of span length or effective span length. But calculated impadt factors from this function are different to the measured values of long-span bridges such as cable-stayed bridge, suspension bridge. There are several methods to estimate the impact factor of cable supported bridges. In this study, the impact factor of cable-stayed bridges is estimated from dynamic load tests and compared to calculated values from the various design codes.
This paper presents an analytical approach to evaluate a possibility of progressive collapse of reinforced concrete frame structure. In order to simulate adequate behavior of the structure, we considered the bond failure of lap spliced bars due to concrete crack in a plastic hinge region. Analysis result gave that there was additional deflection due to the bond failure of bar in beams at the node where the increasing displacement load was applied. The stress was concentrated to the beam where a column was removed, and as it goes up to higher stories, the moment change of an upper story appeared less.
There is a limit to the representation of finite element analysis modeling of the pure shear of corrugated plate. However, if the shear force is applied to the corrugated plate, the set of appropriate boundary can be obtained to the nearest theory value. In this study compared Shear buckling strength about each boundary condition with the plate shear theory. And then each boundary condition applied to sinusoidal corrugated plate, evaluate convergence of the minimum shear buckling strength of each boundary condition and shear buckling flow was observed through shear buckling mode shape.
In this study, the unique material characteristics of steel fiber-reinforced concrete were introduced to extend the application of the compression field models to evaluations of shear capacity and behavior of steel fiber-reinforced concrete (SFRC) members. To achieve this purpose, nonlinear finite element program is developed using secant stiffness-based formulations, and the proposed numerical model was verified using basic experimental results of SFRC shear panels.
Existing approaches on flexural analysis of unbonded post-tensioned concrete beams are very difficult to be applied to estimation of service load behavior up to failure. In this study, theorectical flexural behavior model for post-tensioned members with unbonded tendons was, therefore, proposed based on the basic concept of idealization of curvature distribution within maximum moment region in a simple manner, which was previously developed by authors. The proposed model can predict the service load behavior as well as ultimate strength, and it is confirmed that this concept can be extended to estimate the flexural behavior of continuous unbonded post-tensioned members.