• Ecology and Resilient Infrastructure
• /
• 제7권3호
• /
• pp.199-207
• /
• 2020

전 세계적으로 홍수, 가뭄, 열파 등 기상재해가 빈발하는 환경에서 도시공원은 휴식, 문화, 생태적 기능뿐만 아니라 도시민의 안전을 위한 기능도 제공해야 한다. 본 연구는 도시 내 기후변화에 대응하는 녹색 공간인 생활권 공원에 복합기능을 확보하는 목적으로 도시인의 안전을 위한 도시방재공원의 분류체계를 제안하였다. 문헌 조사를 통해 분석지표를 추출하고, 대상지 현장조사 및 관련자 인터뷰를 통해 분류체계를 검증하였다. 평가를 위한 대분류는 도시공원의 입지, 공간구성, 방재복합시설 3가지로 구분하고, 실증 분석을 통하여 도출된 문제점에 대한 개선방향을 제안하였다.

• 터널과지하공간
• /
• 제25권1호
• /
• pp.37-45
• /
• 2015

최근 많은 도시에서 홍수와 산사태 같은 자연재해가 빈번하게 발생하고 있다. 기상이변으로 인한 집중강우로 우수유출량이 증가되어 침수피해 위험이 가중되고 있다. 부정적인 유출량 변화를 합리적으로 조절하여 도시홍수 등의 피해를 경감하려는 목적에서 우수유출 저감시설을 적극적으로 도입하려는 노력이 시도되고 있다. 따라서 이러한 시설을 적극적으로 보급하기 위하여 지하 우수저류시설 설치사업의 합리적인 분석과 대책을 마련할 수 있는 연구가 절실히 필요하게 되었다. 본 연구에서는 도시방재를 위한 부산지역 우수저류시설 설치사업의 현황과 문제점을 분석하여, 도시방재를 위한 우수저류시설 설치사업의 대책을 제안하였다.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2008년도 추계 학술발표회
• /
• pp.1452-1455
• /
• 2008

In order to establish active and effective recycling plans on construction wastes, the study seeks to built unit generation data per construction waste types on each sector, prepare units data on urban construction waste generation and serve as meaningful data on the establishment of policies on construction waste recycling targeting urban regions. The significance of the study is on the establishment of construction waste recycling plan prior to generation, not as complementary measures on construction waste generated.

• 한국방재학회 논문집
• /
• 제10권4호
• /
• pp.33-46
• /
• 2010

강원도내 14개 시군을 3개 지역(도농통합형 지역, 도시형 지역, 농촌해안형 지역)으로 나누고 지역에 거주하는 지역자율방재단을 표본집단으로 하여 설문조사한 결과, 도농통합형 지역과 도시형 지역이 농촌해안형 지역보다 재해위험인지능력, 피난유도능력, 자주피난 대비정도, 방재체제 정비정도, 감시경계능력, 정보전달능력 등 모든 분야에서 낮은 것으로 분석되었다. 특히 정보전달능력은 3개 지역 모두 높게 나타났으나 자주피난 대비정도는 매우 낮은 것으로 분석되었는데 이는 정보전달능력의 경우 지방정부의 예 경보시스템 증설과 신규 설치로 인하여 재난정보를 신속히 제공할 수 있는 기반이 구축되었지만 자주피난 대비 정도는 주민 스스로가 재해 상황을 정확히 파악할 수 있도록 지속적인 재난대비 교육과 홍보를 실시하고 더불어 사전에 안전한 대피장소 확보방안 등을 모색하여야 할 것이다.

• Earthquakes and Structures
• /
• 제9권1호
• /
• pp.93-109
• /
• 2015

Based on the reconnaissance of buildings in Dujiangyan City during 2008 Wenchuan earthquake, China, structural damage characteristics and the spatial distribution of structural damage are investigated, and the possible reasons for the extraordinary features are discussed with consideration of the influence of urban historical evolution and spatial variation of earthquake motions. Firstly, the urban plan and typical characteristics of structural seismic damage are briefly presented and summarized. Spatial distribution of structural damage is then comparatively analyzed by classifying all surveyed buildings in accordance with different construction age, considering the influence of seismic design code on urban buildings. Finally, the influences of evolution of seismic design code, topographic condition, local site and distance from fault rupture on spatial distribution of structural damage are comprehensively discussed. It is concluded that spatial variation of earthquake motions, resulting from topography, local site effect and fault rupture, are very important factor leading to the extraordinary spatial distribution of building damage except the evolution of seismic design codes. It is necessary that the spatial distribution of earthquake motions should be considered in seismic design of structures located in complicated topography area and near active faults.

• Wind and Structures
• /
• 제22권1호
• /
• pp.89-106
• /
• 2016

With an aim to assess the wind damage to urban trees in more realistic conditions, the nonlinear dynamics of structured trees subjected to strong winds with different levels is investigated in the present paper. For the logical treatment of dynamical behavior of trees, material nonlinearities of green wood associated with tree biomechanics and geometric nonlinearity of tree configuration are included. Applying simulated fluctuating wind velocity to the numerical model, the dynamical behavior of the structured tree is explored. A comparative study against the linear dynamics analysis usually involved in the previous researches is carried out. The failure wind velocity of urban trees is then defined, whereby the failure percentages of the tree components are exposed. Numerical investigations reveal that the nonlinear dynamics analysis of urban trees results in a more accurate solution of wind-induced response than the classical linear dynamics analysis, where the nonlinear effect of the tree behavior gives rise to be strengthened as increasing of the levels of wind velocity, i.e., the amplitude of 10-min mean wind velocity. The study of relationship between the failure percentage and the failure wind velocity provides a new perspective towards the vulnerability assessment of urban trees likely to fail due to wind actions, which is potential to link with the practical engineering.

• 한국화재소방학회논문지
• /
• 제29권5호
• /
• pp.67-72
• /
• 2015

우리나라는 급속한 경재성장 및 도시화로 인해 도시지역의 건축물이 밀집되어 있다. 이러한 지역에서 화재가 발생할 경우, 강풍에 의한 불티의 비산으로 화재가 확대될 위험성이 존재한다. 하지한 현재 불티의 성상에 대한 모델 구축 및 연구가 부족한 실정이다. 본 연구에서는 일본 건축연구소(BRI)의 풍동 시설을 이용한 불티의 성상 실험을 통하여 비산모델을 구축하고 기존의 도시화재 시뮬레이션을 개선하였다.

• Earthquakes and Structures
• /
• 제9권1호
• /
• pp.173-194
• /
• 2015

Site response analysis is an important topic in earthquake engineering. A time-domain numerical method called as one-dimensional (1D) finite element artificial boundary method is proposed to simulate the homogeneous plane elastic wave propagation in a layered half space subjected to the obliquely incident plane body wave. In this method, an exact artificial boundary condition combining the absorbing boundary condition with the inputting boundary condition is developed to model the wave absorption and input effects of the truncated half space under layer system. The spatially two-dimensional (2D) problem consisting of the layer system with the artificial boundary condition is transformed equivalently into a 1D one along the vertical direction according to Snell's law. The resulting 1D problem is solved by the finite element method with a new explicit time integration algorithm. The 1D finite element artificial boundary method is verified by analyzing two engineering sites in time domain and by comparing with the frequency-domain transfer matrix method with fast Fourier transform.

• Structural Monitoring and Maintenance
• /
• 제5권2호
• /
• pp.313-323
• /
• 2018

The presence of water inside concrete structures is an essential condition for the deterioration of the structures. The free water in the concrete pores and micro-cracks is the culprit for the durability related problems, such as alkali-aggregate reaction, carbonation, freeze-thaw damage, and corrosion of steel reinforcement. To ensure the integrity and safe operation of the concrete structures, it is very important to monitor water seepage inside the concrete. This paper presents the experimental investigation of water seepage monitoring in a concrete slab using piezoelectric-based smart aggregates. In the experimental setup, an $800mm{\times}800mm{\times}100mm$ concrete slab was fabricated with 15 SAs distributed inside the slab. The water seepage process was monitored through interrogating the SA pairs. In each SA pair, one SA was used as actuator to emit harmonic sine wave, and the other was used as sensor to receive the transmitted stress wave. The amplitudes of the received signals were able to indicate the water seepage process inside the concrete slab.

• Earthquakes and Structures
• /
• 제9권5호
• /
• pp.1029-1044
• /
• 2015

To investigate the seismic pounding response of long-span bridges with high-piers under strong ground motions, shaking table tests were performed on a 1/10-scaled bridge model consisting of three continuous spans with rigid frames and one simply-supported span. The seismic pounding responses of this bridge model under different earthquake excitations including the uniform excitation and the traveling wave excitations were experimentally studied. The influence of dampers to the seismic pounding effects at the expansion joints was analyzed through nonlinear dynamic analyses in this research. The seismic pounding effects obtained from numerical analyses of the bridge model are in favorable agreement with the experimental results. Seismic pounding effect of bridge superstructures is dependent on the structural dynamic properties of the adjacent spans and characteristics of ground motions. Moreover, supplemental damping can effectively mitigate pounding effects of the bridge superstructures, and reduce the base shear forces of the bridge piers.