The dynamic behaviour of container crane under seismic loading is a complex issue, especially for assessing uplift. The pin support is commonly used to model the contact between crane’s legs and the ground/rails in low seismicity area. However, the behaviour of the structure is quite different under high seismic intensity because the crane’s wheels are not fixed to the rails in operation. In this study, therefore, a 3-D finite element (FE) model was simulated with gap elements to consider the uplift behavior. In addition, the vertical reaction of the crane’s legs were investigated as well.

Most of systems and components in nuclear power plants (NPPs) are anchored to the concrete structure and other components by means of post installed anchors. In order to develop more accurate seismic analysis model of equipment in NPPs, a deep consideration of concrete-anchor connection behavior is required. In this paper, the nonlinear finite element analysis was conducted for the concrete-anchor connection zone details. From the analysis results including strength and load-displacement relation was derived according to design variables including geometry and material properties.

The purpose of this study was to improve the buckling strength of steel plate shear wall system. The variable of this study was arrangement and aspect ratio of steel plate. The arrangement of continuity and both sides were compared. And the aspect ratio 1.3 and 0.8 were compared. As a result, there was no significant difference between the arrangement of continuity and both sides, and it was observed that there was no significant difference of behavior when the aspect ratio was decreased.

The purpose of this study was to experimentally evaluate seismic performance of connection of modular system. As a result of experiment study, two specimens did not show the strength reduction and brittle fracture at connection until 2% story drift. Thus, requirements for intermediate moment frame(IMF) was satisfied in two specimens.

In this study, the seismic retrofitting effect of existing frame was evaluated. The strength and energy dissipation capacities of three reinforcement methods were evaluated based on the existing literatures. In the case of strength and energy dissipation capacity, it was evaluated that reinforcing effect of specimen reinforced with damper by installing K brace inside the frame was excellent. Also, it was evaluated that there is an effect of seismic reinforcement in the external retrofitting case. Therefore, proper seismic retrofit planning is expected to ensure the seismic safety of buildings.

In this study, seismic strengthening method using precast concrete rocking wall is considered in the literature studies. As a result of reviewing the two studies, it is considered necessary to develop a sequential study on development of lightweight precast wall panel, application of post-tension method, and development of location and shape of energy dissipation devices.

An advanced lumped-mass stick (LMS) model introduced in this paper is to overcome the disadvantages of the conventional lumped mass stick model, such as frequency error and low accuracy of dynamic responses. In order to show the performance of the advanced lumped-mass stick model, the experimental test using shaking table is conducted, considering a scaled four-story frame structure. The material of the frame model is stainless and the total mass of the model is about 39kg. The displacement and acceleration responses resulted from the advanced LMS model are compared with those of experimental results, including the response results of the conventional LMS model of the frame model.

Eight small scale circular reinforced concrete columns were tested under cyclic lateral load with 4.5 aspect ratio. The test variables are longitudinal steel ratio, transverse steel ratio, and axial load ratio. Eight flexurally dominated columns were tested. In all specimens, initial flexural-shear cracks occurred at 1.5% drift ratio. The multiple flexural-shear crack width and length gradually increased until the final stage. The angles of the major inclined cracks measured from the vertical column axis ranged between 40 and 48 degrees. In particular, this study focused on assessing transverse reinforcement contribution to the column shear strength. Transverse reinforcement contribution measured during test. Each three components of transverse reinforcement contribution, axial force contribution and concrete contribution were investigated and compared.

Nuclear power plants in operation are composed of many electrical equipment, and various types of safety related components are installed in the electrical equipment. These internal components are repeatedly replaced due to aging and their performance improvements during the operation of nuclear power plants. Replacement of safety-related shall demonstrate that no malfunction occurs even under amplified seismic load at the level where the components are mounted on the electrical equipment. Therefore, it is necessary to derive the accurate seismic load from the level where the target components are mounted on electrical equipment through the equipment seismic analysis. To perform seismic analysis of electrical equipment, dynamic characteristics should be extracted through in-situ test and utilize to improve the electrical equipment seismic analysis model. In this study, in-situ test of typical NPP’s electrical equipment is performed to derive a natural frequency and mode shapes in the horizontal direction.

Even though Korea is located rather far away from the active fault area, it was thought to have never been completely immune from the earthquake hazards. Many historic records and recent Gyeongju seismic indicated that Korea should belong to a moderate or low seismic region. Through the analysis of classification for each type, we have chosen 2 reinforced concrete bridge. This paper presents a seismic performance evaluation of existing 2 circular reinforced concrete pier.

In this paper, structural behavior of internal and external connection of modular system was evaluated by finite element analysis(FEA). As a result of FEA, results of experiment and analysis were nearly similar to validate analysis model. Parametric analysis will be necessary using this valid analysis model

In this study, the seismic performance of a Low-rise Pilotis Building with Central Core is investigated. Low-rise Pilotis Buildings are very popular in Korea, but regarded as very weak structure to earthquake.

In this study, the seismic performance of a Low-rise Pilotis Building with Eccentric Core is investigated. Low-rise Pilotis Buildings are very popular in Korea, but regarded as very weak structure to earthquake.

This paper presents the seismic performance of the steel damper under reversed cyclic loading. The U-shaped steel damper used in this study was designed to have energy dissipation zone with an external diameter of 120 mm, a width of 15 mm, and a thickness of 15 mm. The cyclic loading test was carried out using an uniaxial universal testing machine with a capacity of 2,000 kN. The test results indicated that no strength deterioration of the specimen was found as well as the equivalent damping ratio of the specimen was excellent.

In this study, we propose a structural modeling method to analyze the seismic behavior characteristics of arched stone bridge. For this purpose, we select the representative model of arched stone bridge, and various arch types are set in consideration of the width and height. Accordingly, this study applies the discrete element method for the modelling of discontinuum structure to analyze the seismic behavior characteristics according to the various arched types.

The target in the design of base isolated structures is the selection of isolation system properties so that optimal performance is achieved among seismic levels and performance metrics. To withstand very rare ground motions, isolation system are frequently designed with significant strength or damping, and as a result such devices provide reduced isolation effect for more frequent seismic events. To investigate improvements to the design of isolated structures, a lot of research program is performed. Experimental investigations are presented to characterize smart base isolation capable of progressively exhibiting different hysteretic properties at different stages of response. Shear tests are conducted along the ISO standard, including harmonic characterizations tests. These tests included various input intensities, multi-component excitation. Behavior of the new smart base isolation system is compared with that of linear isolation systems with both nonlinear viscous and bilinear hysteretic energy dissipation mechanisms.

This paper analyzed design bearing capacities of pile foundations strengthened by pre-loading method for vertical expansion. The bearing capacities were investigated for two different pre-loading strategies: (1) after partial removals of structural/non-structural elements (e.g. finish, masonry wall etc.); and (2) after vertical expansions. Based on the numerical studies, more than 60% of the existing piles exceeded the design bearing capacities due to the difference of pre-loading strategies, which should be considered in structural design.

This paper presents the basic data for the structural safety study of the extension wall by evaluating the bending stresses of the existing and extension walls varying according to the plan change of the extension building through the numerical analysis on the horizontal load as follows: 1) the stress variation of the divided wall when the wall opening due to a partial demolition is evaluated by comparing the result of analysis on whether or not the opening of the bearing wall is demolished as a variable; 2) the stress variation of the existing wall due to the increase of the stiffness of the extension wall is also evaluated by comparing the result of analysis on the thickness of the extension wall as a variable.

This study evaluates a prestressing effect of reinforced concrete (RC) beam strengthened with a pre-strained iron shape-memory alloy (Fe-SMA) strip. A pre-strained value was chosen as experimental variable to investigated the prestressing effect on the RC beams. A recovery stress on the pre-strained Fe-SMA strip occurred by heating, when the deformation of the strip was restricted. The recovery stress introduced a compressive force to the surrounding concrete, resuting in the upward deflection (camber effect). With this finiding from experimental tests, it could be concluded that the Fe-SMA strip can be used as the strengthening material to strengthen the damaged structure and to increase its durability.

The 'Housing Act (‘14.04), which permits the remodeling of old apartment buildings, has been implemented. In particular, vertical remodeling is generally implemented by adding 2~3 floors above the top floor of existing apartments. Technically, it is necessary to reinforce the existing pile due to the increase of vertical, horizontal, seismic load, etc. However, the existing piles are loaded simultaneously and so each pile was constructed at limited base space for application of reinforcement method. The bearing capacity of existing piles decreases due to vertical expansion so the bearing capacity of the piles must be confirmed by the indirect method(laboratory test etc.) in the first safety diagnosis and by the direct method(field test etc.) in the second safety diagnosis.