A concrete-filled arch rib causes to increase effectively sectional strength and resistance against buckling, and minimize stiffeners. Since a reduced beam theory includes the effect of variable section properties, it is suitable to structural analysis of new composite girder such as SB-Arch girder. Analysis results are verified by experimental method, and arch behaviors and/or arching effects are shown to be increased for SB-arch girder with 20m span.
A cut slope mudstone formed due to construction work has usually been accompanied such as a joint and fracture zone so it especially is required to be significant care when cutting rock construction.
Therefore, in this study was analyzed about engineering characteristics through case of a slope activity. In addition, two-dimensional finite element analysis with construction stages and actual measurement results were compared by each displacements.
Through this, application between finite element analysis and actual field condition was investigated for stable slope design and construction.
While construction of dams have provided a solution for the depletion of fresh water which has brought up a demand for the storage capacity of such structures, On the other hand, dam failures cause serious damages to human lives and properties. Most studies for the stability analysis of dams have been performed by 2-dimensional modelling, which cannot take into account for various up/downstream shapes and boundary conditions related to various geological conditions. Considering such circumstances, 3-dimensional FEM analysis has tremendous advantages compared to 2-dimensional analysis because 3-dimensional modelling can catch the stress-strain behavior of dam more accurately.
In this study, experimental research was carried out to improve and evaluate the seismic performance of reinforced exterior concrete beam-column joint strengthened with different anchorage length of embedded CFRP Rods in existing reinforced concrete building.
Test result shows that retrofitting specimen(RBCJ-SR2T1, SR2T2) designed by the improvement of seismic performance of reinforced concrete beam-column joints, maximum load-carrying capacities were increased 2.24 ~ 2.24 times in comparison with the standard specimen(RBCJC). Also, retrofitting specimens showed stable hysteretic behavior compared to the standard specimen(RBCJC).
Numerical Analysis of corrugated-metal culvert is mainly related with corrugated shape, plate thickness, and load transmission mechanism, and these elements especially should be treated consistently in the analysis of 3-Dimensional analysis of behavior of skewed corrugated-metal culvert. And so, the modelling technic, 3-dimensional equivalent plate modelling, is required to be modified.
In this study, four reinforced concrete beams, replacing recycled coarse aggregate with PVA fiber(BSPG-R series), were constructed and tested under monotonic loading. Experimental programs were carried out to improve and evaluate the structural performance of such test specimens, such as the load-displacement, the failure mode and the maximum load carrying capacity. all the specimens were modeled in 1/2 scale-down size.
This study aims at understanding of the importance of modeling boundary conditions for connections of modules in 12-story modular building. The peak roof drifts under fixed condition and pinned condition are compared at design intensity levels in this paper.
In case of Enlargement method using Post-installed Anchors, mechanical expansion anchors were resisting tensile and shear force of Modular extension structure in exist building. The purpose of this study is to investigate strength of Post-installed Anchor on 16 MPa low strength Concrete under less than standard effective depth(hef). The fracture pattern of the specimens in Pull-out tests was pull-out failure and concrete break out failure. In monotonic load shear tests the fracture pattern was steel failure of anchor and concrete break out failure.
In case of Enlargement method using Post-installed Anchors, mechanical expansion anchors were resisting tensile and shear force of Modular extension structure in exist building. The purpose of this study is to investigate cyclic load shear strength of Post-installed Anchor on 16 MPa low strength Concrete under less than standard effective depth(hef). The fracture pattern of the specimens in cyclic load shear tests was steel failure of anchor and the strength showed 19% less than that of the design strength on test anchor manufacturer.
The SPC wall girder is connected to the vertical walls to enhance performance of wall-wall girder connection. The purpose of this study is to investigate the structural characteristics such as strength, Load-displacement relation of wall-wall girder connection under the monotonic load tests. The fracture pattern of the specimens induced positive moment at connection was steel plate separation from concrete in SPC Wall.
Based on the study of development of motor-driven electric tool, it was found that the use of the mechanism developed was effective to bolt unit modules. On the other hand, an additional study is required such as torque of the tool.
It has becoming issue of damage in finishing materials of the exterior and interior when have to the transportation and lifting. So the purpose of this study is analyze for correlation of load on connecting part of unit modular when transporting unit modular by vehicle
Through the analysis of load behavior for two fixing equipments, the suggested fixing equipment shows higher limit load than an existing fixing equipment, which proves that the suggested fixing equipment have higher safety.
This is preliminary study for development of specialized seismic performance evaluation and reinforce guidelines for piloti-type buildings. A residential Building with Pilotis was selected and the seismic performance evaluation was performed. The vulnerable parts of the piloti-type building for earthquake and the risks are verified. Finally, the necessity of evaluation and reinforce guidelines for the building with pilotis is presented.
Through The Japanese case that they prevent earthquake damage by using seismic design, we design a building that before reform seismic design and conduct a seismic design evaluation.
For detail evaluation, we use Nonlinear Static Analysis and find performance point that using by Capacity Spectrum Method of procedure B and Displacement Coefficient Method.
We compared performance point of Capacity Spectrum Method of procedure B and target displacement of using Displacement Coefficient Method. Consequently we obtain a result that those are similar.
Result of understanding each element performance level that base on performance point, some elements are unsatisfactory. Thus, We have come to conclusion that re-evaluate after reinforce structure.
This paper presents a parametric study of the effect of vertical ground motion on a simple RC frame with different geometric configurations including span length, span ratio and story height. The effects of a suite of earthquake ground motion records on RC frames are presented and the results are compared with the case of horizontal-only excitation. The structural response was investigated at both the global and the local levels. Interstory drift was considered as a global failure criterion, while the curvature ductility and shear capacity of structural members were monitored to assess failure on a local level. The effect of vertical ground motion on axial force and shear capacity is also investigated.
This study is about an earthquake disaster response system and an application technology for post-earthquake safety evaluation. The mobile application supports field survey on earthquake damage buildings and shortens the surveying time. The results from the mobile are transmitted to a data managing program. And it displays a surveyed-place, result and suggests statics. This system is expected to support local governments to effectively respond to earthquake disasters.
Recently, the demand for the damper-frame system has increased due to earthquake damage. And related researches are increasing in response while the researches considering the various design parameters such as strength and stiffness ratios between the damper and frame are insufficient. Therefore, in this study, propose for design characteristics value of the damper-frame system by setting the parameters related to strength and stiffness ratios between two systems and prediction formula through nonlinear dynamic analysis.
For the seismic performance assessment of a building, a lot of time and manpower are needed. In this paper, alternative procedure based on modeling transformation for the effective seismic performance assessment of the buildings is suggested. The suggested procedure is applied for the seismic performance assessment of an apartment building consisted of the ordinary reinforced concrete shear walls as the example model and its effectiveness is reviewed
The dynamic loads such as wind and wave loads are consistently applied to the offshore structure. These dynamic loads affect to the safety and the durability of offshore structure. Tuned Liquid Damper (TLD) was applied to control the vibration of an offshore structure due to dynamic loads. The target structure is jacket structure with PC House for 5-MW offshore wind turbine.