This study introduces physical property of biodegradable construction materials and their possible methods of performance evaluation. The used biodegradable polymer was Polycarporlactone and additionally Starch and pMDI was also mixed to accelerate biodegradation of composites as well as reduce the cost of composites. Tensile strength, modulus and elongation was measured as to Starch and pMDI mixing ratio to PCL. Test results showed that the addition of Starch resulted in the reduction of tensile strength, modulus and elongation due to the weakness of PCL-Starch interfaces. On the other hand, the addition of pMDI to composites improved physical property and the best effect was revealed when the composites were PCL/Starch (80/20) resulting reinforcement of PCL-Starch interfaces. The performance evaluation of possible biodegradable construction materials was summarized by systematical methods. The requirement conditions for complex-type vegegation unit was first arranged and then transferred to requirement performance. The test performance was classified based on KS ISO standards from non-biodegradable plastics test methods. Finally, environmental performance was proposed by evaluating life cycle assessment of biodegradable construction materials from production of raw materials to decomposition of composites-type vegetation unit.

현재 저류시설과 같은 유출저감시설은 국내에 적용된 사례가 거의 없고, 구체적인 설치 기준 및 설계 방법에 대한 기준이 미비하며, 저감량을 정량화하는 것이 곤란한 문제점을 지니고 있다. 이에 따라 유출저감시설의 정량화 지표가 개발될 때까지 국내에서 보편화되어 있는 유역출구 저류시설인 저류지를 기본 저감시설의 형식으로 채택하고 추가적으로 침투형 저감시설을 최대한 적용하고 있는 실정이다. 이러한, 저류지의 설계는 저류용량 및 방류시설에 이르기까지 까다로운 절차를 거쳐 제원을 결정하고 있어 계획단계에서는 불필요한 인력 및 시간이 소모되기도 한다. 따라서 본 연구에서는 기존 FFC11-SimPOND 모형의 저류지 규모결정 과정과 방류암거의 간편설계절차를 일원화하여 계획단계에서 저류지 용량과 방류암거의 설계제원을 손쉽게 산출할 수 있도록 SimPOND-CO 모형을 구축하였다.

To evaluate residual settlement of the high-speed railway trackbed, it is hard to apply immediately settlement analysis because in-situ ground has additional creep or secondary consolidation behavior. To select the settlement analysis method, this study compared measurement data with hyperbolic, Asaoka, Hoshino method result. All residual settlement analysis method has a tendency to be underestimated because of in-situ creep behavior, however all the method are reliable because R2 is high(over 0.94) and RMSE(Root Mean Square Error) is low. The additional measurement data comparison shows that hyberbolic method is the most appropriate method with high accuracy and application.

잔류응력이 판의 파괴 특성에 미치는 영향의 정량적 평가를 위하여, 균열이 존재하는 CT(Compact Tension) 시편에 가스 토오치 (gas torch)를 이용한 국부 가열을 실시하여 인위적인 잔류응력을 생성시키고, 열탄소성 유한요소해석을 통하여 생성된 잔류응력장을 평가하였으며, 잔류응력이 존재하는 시편과 잔류응력이 존재하지 않는 시편에 대한 파괴인성 실험을 실시하여 이들의 결과를 파괴저항 선도 상에서 비교, 분석함으로써 압축 잔류응력이 파괴 특성에 미치는 영향을 정량화하였다.

For the rational and economic design of the structural elements of ships which is built using welding, the ultimate strength analyses of the plates having initial imperfections, such as welding residual stresses and strains, are needful. The welding deformation usually relied on approximative equations or based on expert's experience. But in this paper, for the thermal elasto-plastic analysis of plates, the finite element analysis was performed, based on initial strain method. In formulating the incremental analysis, unbalanced force terns were included. In the plastic domain during the incremental process, the 2nd order terns stress increment and yield stress increment were considered, so that time increment could be controlled for a more stable solution. The ultimate strength analysis program of the plates having initial imperfections was made. The ultimate strength analysis was carried out based on the results of the welding deformations of this paper. In the ultimate strength analysis the Rayleigh-Ritz method based on the minimum potential theory was used.

The main problems in structural analysis by Finite Eelement Method are difficulty in making data file and error estimation. For decreasing these problems' pays. have been suggesting the adaptive mesh refinement and error estimation method. Posteriory error estimation methods suggested by Jang[1], Babuska[2,3], Ohtsubo[8,9], and this paper. Comparing these methods and examine their properties. According this paper, In the problem supposed having singularity, the method suggested by this paper is good, But the problem supposed having no singularity, the method suggested by Jang[1] is good. For decreasing the effect of initial mesh in p-refinement, make application h-refinement at first and apply p-refinement, and confine polynomial's degree to two, for making program simply by plural mesh models are not needed.