본 연구는 옥산서원의 입지 및 공간구성의 특성을 풍수의 관점에서 살펴보았다. 그 결과 옥산서원의 입지는 전체적으로 풍수적 길지에 해당되었다. 구체적으로, 풍수의 길격 요건을 갖춘 내룡이 서원 영역으로 이어져 와 멈춘 풍수적 혈에 강당이 정확히 자리해 있다. 주변 산줄기 또한 서원 영역을 바람의 피해로부터 막아주고 있으며, 옥산천 물길은 그 형태 및 역수의 측면에서 길한 요건을 갖추고 있다. 옥산서원 공간구성의 특징은 밀폐된 건물배치이며, 그것은 무변루의 내부 지향적인 구조에 기인한다. 무변루의 내부지향적 구조의 원인은 크게 세 가지 이며, 그것은 회재의 학문에 대한 열정과 은거관이 무변루의 폐쇄적 구조로 재현된 점, 세심대가 서원 영역과 인접해 있는 점, 서원 영역과 옥산천 건너 대안의 표고 차에 따른 바람의 피해를 막기 위한 점으로 요약된다.

The first instrumental earthquake observation in Korea was started in 1905 by installing mechanical seismometers at the Incheon Observatory. Since then, the largest earthquake with a magnitude of 5.8 has occurred in Gyeongju in 2016. The seismic data on the Gyeongju earthquake are provided in the form of Mini Seed from the Korea National Earthquake Comprehensive Information System (http://necis.kma.go.kr/). In this study, it is aimed to understand the response characteristics of Gyeongju seismic waves. The response spectra of El Centro, Taft and the 2016 Kumamoto earthquake are compared and analyzed. In the response spectrum analysis, the acceleration response and the energy response were mainly considered.

In this study, effectiveness of seismic retrofitting methods using passive damping devices was investigated through numerical analyses of short-period structures under earthquakes which have short-duration and high-frequency impulse characteristics similar to Geyongju earthquakes. Displacement spectra of elastic systems and ductility demand of inelastic systems were evaluated by increasing viscous or friction damping. The damping devices could reduce responses of the structures with shorter structural period than 0.2s. The earthquakes similar to impulse load did not induce the responses of the structures with longer period than 0.4s, and the effects of the damping devices which generates damping forces proportional to structural responses became insignificant.

In this paper, time and frequency domain characteristics of Gyeong-ju earthquakes were investigated, and nonlinear time history analyses were conducted for bi-linear hysteretic structures excited by short-duration ground accelerations. Previous studies showed that larger inelastic displacements than the peak displacement of the corresponding elastic system were observed especially for the structures with structural period shorter than 0.3s, and the similar results could be obtained when long-duration ground accelerations were used as excitation loads. For the short-duration earthquakes, however, the inelastic displacements were not so large and almost identical to the peak elastic displacements.

The Gyeong-Ju earthquake in the magnitude of 5.8 on the Richter scaleoccurred in September 12, 2016. Because there are many nuclear power plants (NPP) near the epicenter of the Gyeong-Ju earthquake, the seismic stability of nuclear power plants is becoming a social problem. In order to evaluate the safety of seismically isolated NPP, the seismic response of a NPP subjected to the Gyeong-Ju earthquake was compared with those of 30 sets of artificial earthquakes corresponding to the nuclear standard design spectrum (NSDS). A 2-node model and a simple beam-stick model were used for the seismic analysis of seismically isolated NPP structures. Using 2-node model, the effect of internal temperature rise, decrease of shear stiffness, increase of lateral displacement and decrease of vertical stiffness according to nonlinear behavior of lead-rubber bearing (LRB) were evaluated. The displacement response, the acceleration response, and the shear force response of the seismically isolated nuclear containment structure were evaluated using the simple beam-stick model. It can be observed that the seismic responses of the isolated nuclear structure subjected to Gyeong-Ju earthquake is significantly less than those to the artificial earthquakes corresponding to NSDS.

The purpose of measuring a dam operated after design & construction is to properly operate reservoir and maintain dam structural safety by comparing the really measured data for the behavior of dam with the data for design & construction, the past mesured data and analyzing them. In this paper, the really measured data is analized for a dam facilitiy located near a seismic epicenter of earthquake that occurred on 12th, Nov. 2016 in Gyeong-ju and the results of safety inspection for a dam is shown by comparing the behavior of dam before and after occuring earthquake

The purpose of measuring a dam operated after design & construction is to properly operate reservoir and maintain dam structural safety by comparing the really measured data for the behavior of dam with the data for design & construction, the past mesured data and analyzing them. In this paper, the really measured data is analized for a dam facilitiy located near a seismic epicenter of earthquake that occurred on 12th, Nov. 2016 in Gyeong-ju and the results of safety inspection for a dam is shown by comparing the behavior of dam before and after occuring earthquake.