In cases of wooden structure and wooden house installed on the outside, metal goods used for basic connection are usually screw bolts, strainless nails and general iron nails. As metal connections on wood are directly exposed to exterior environment, friction resistibility of nails on metal connections declines and continual defects on this are generated and maintenance for it is required. However, experiments and analyses for preparing basic data for improvement of the problems have been not conducted so far and wooden structures with defects are abandoned. Accordingly, by analyzing friction resistibility of connections by each kind of woods and metal goods, the study aims to suggest to use metal goods appropriately by kinds of woods and manufacture conditions with analysis on characteristics of resistibility of extracting nails for solving such problems and to secure basic data for establishing maintenance, repair and reinforcement plans.

이 연구에서는 전단하중을 받는 부유식 콘크리트 구조물 모듈 접합부의 구조거동 실험연구를 수행하였다. 모듈 접합부 전단키의 균열 양상, 전단거동 및 전단강도를 파악하였다. 전단강도의 영향을 파악하기 위해 전단키의 경사각도, 횡방향 구속응력 및 콘크리트의 압축강도 등을 실험변수로 고려하였다. 전단키의 경사각도가 증가함에 따라 접합부의 전단강도가 증가하였다. 또한, 구속응력이 증가함에 따라 전단키의 전단강도가 증가하였다. 실험변수에 따른 전단거동 실험결과를 토대로 접합부의 전단강도 평가식을 제안하였으며, 제안식에 의한 전단강도 예측값은 실험값에 근접하는 것으로 나타났다.

In this study, shear assessment equation of reinforced concrete interior beam-column joints without shear reinforcement using high ductile fiber reinforced mortar based on the test results was proposed. Suggested equation was proposed to modify Hegger's seismic design equation. It was reflected the effect of high ductile fiber incorporated

In this study, experimental research was carried out to evaluate and improve the constructability and structural performance of high strength R/C interior beam-column joints regions, with or without the shear reinforcement, using high ductile fiber-reinforced mortar. Specimens designed by retrofitting the interior beam-column joint regions of existing reinforced concrete building showed a stable mode of failure and an increase in load-carrying capacity due to the effect of enhancing dispersion of crack control at the time of initial loading and bridging of fiber from retrofitting new high ductile materials during testing.

In order to reduce the carbon dioxide exhaust quantity and the energy amount and the waste which becomes the global warming primary reason recently, the most efficient method was focused on the long-life building in Structural field. So in order to improve seismic capacity, new shape steel damper may be used in bolted connection, which made reuse of member impossible owing to serious brittle fracture of main member such as beam and column. To solve above problem, new type connection was developed and tested. As result of test, new type connection was shown good seismic capacity and main member such as beam and column were stable behavior.

This paper presents analytical studies on the cyclic behavior of column-tree steel moment connections by FEA. The column-tree moment connections are composed shop welded beam-to-column connection and field bolted beam-to-beam splice. Two analytical model of column-tree moment connections were designed with beam splice lengths of 900mm and 1,100mm, which are roughly 1/6 and 1/7 of the span length of 7,500mm. In order to verify the FEA reliability, the analytical results was compared with experimental results. Meanwhile, the experimental results were understood better through analysis procedure.

The purpose of this study was to evaluate the seismic performance of high-performance steel. For this study, the hysteretic behavior and deformation shape of steel beam-to-column connections with SM570TMC was investigated using non-linear finite element analysis. The non-linear finite element analysis was carried out using ANSYS. The displacement analysis of steel beam-to-column connections was conducted according to the qualifying procedures of current korean building code(KBC2009).

To evaluate the ductility of high strength steel beam-to-column connections, Cycle loading connection test was conducted targeting HSA800 steel being developed in Korea and parameter is connection details. According to the study, The non-scallop detail and improved horizontal rib reinforcement detail used in this study enhanced deformation capacity of high strength steel connections which have brittle tendency by stress relaxation.

Connection details were developed for the composite column using high strength steel angles. Load-carrying capacity, deformation capacity, and load transfer mechanism of three beam-to-column joint specimens were evaluated under cyclic load tests. In the experiments, mega columns were used for the application in high-rise buildings

Under cyclic loading, the shear capacity of reinforced concrete (RC) beam-column connections is significantly decreased by the joint bond-slip and shear cracking as deformation increases. In the present study, Joint shear strength model on the basis of bond-slip was developed to evaluate deformability at the joint shear failure.

In this study, experimental research was carried out to study the high strength RC exterior beam-column joints regions, without the shear reinforcement, using high ductile fiber-reinforced mortar. Test results showed that specimen BCJNSP1.0 were increased th maximum load-carrying capacity and showed stable hysteresis behavior and satisfactory crack pattern in comparison with th specimen BCJNS without shear reinforcement in the beam-column joint region.

In this study, experimental research was carried out to study the high strength RC exterior beam-column joints regions, without the shear reinforcement, using high ductile fiber-reinforced mortar. Specimens designed by retrofitting the exterior beam-column joint regions of existing reinforced concrete building showed a stable mode of failure and an increase in shear strength capacity due to the effect of enhancing dispersion of crack control at the time of initial loading and bridging of fiber from retrofitting new high ductile materials during testing.

As an effort to enlarge the territory of the county, many researchers have been studying floating foundation system. The procedure to build such structure needs prestressing and the joint that unify the precast concrete modules. Most importantly, the performance of aqua-epoxy used joint between modules is a critical factor of the structure, thereby it is important to evaluate the performance of it. Hence, this study tests the performance of the joint due to the joint length and the material properties of aqua-epoxy. The result showed that the specimen of 1cm joint length using 2% silica-fume mixed aqua-epoxy has the optimum load carrying capacity.

In this paper, a moment resisting precast concrete beam-to-column connection is proposed for high seismic zones using bolt type connection. An experimental study was carried out to investigate the behavior of the proposed connection subjected to cyclic loading

Recently, study on the application of sustainable materials to building and civil structure fields has been increased. Especially, the usage of aluminum alloys can improve durability of structures due to it’s high corrosion resistance. In this study, to investigate the ultimate behaviors such as ultimate strength and fracture mode of single shear bolted connections with aluminum alloys (7075-T6), experiments were conducted. Main variables are bolt arrangement and end distance parallel to the direction of load. As a result, the specimens failed by shear out fracture and block shear fracture and also the specimens with long end distance were accompanied by curling (out of plane deformation). The curling led to reduction of ultimate strength or rigidity. Futhermore, pattern of strain distribution was investigated according to curling occurrence.

Hybrid coupled shear wall with steel coupling beam has often been used to resisting system of earthquake load and transverse load. This study addresses the strain characteristics of coupling beam in hybrid wall system.

by analyzing friction resistibility of connections by each kind of woods and metal goods, the study aims to suggest to use metal goods appropriately by kinds of woods and manufacture conditions with analysis on characteristics of resistibility of extracting nails for solving such problems and to secure basic data for establishing maintenance, repair and reinforcement plans.

In this study, experimental research was carried out to study the structural performance of slab-column joints designed by the application of reducing of joint regions damage using steel fiber reinforced concrete. Test results showed that specimens(RCFPS series) were increased the maximum load-carrying capacity by 1.12~1.23 times and showed stable hysteresis behavior in comparison with the standard specimen(SRCFP).

In this study, experimental research was carried out to improve and evaluate the seismic performance of reinforced concrete beam-column joint using carbon fiber sheets in existing reinforced concrete building. Test result shows that retrofitting specimen(LBCJ-CS1, CS2) designed by the improvement of seismic performance of reinforced concrete beam-column joints load-carrying capacities were increased 1.26～1.35 times in comparison with the standard specimen.

This study includes an analytical investigation of a composite beam consist of concrete, structural tees, and the reinforcement steel. The plastic hinge length theories are applied to this composite beam to calculate maximum deflection exactly. This composite beam can reduce the floor height compared with the reinforced concrete structure with same internal force. To calculate maximum deflection, we used plastic hinge length suggested by Corley, Sawyer and Mattock. Later, the experimental investigation should be performed to find out the plastic hinge length exactly.