• Title/Summary/Keyword: 중아부 하중

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Relationship between Concrete Pavement Stresses under Multi-Axle Interior and Edge Loads (중앙부와 모서리부 다축 차량 하중에 의한 콘크리트 도로포장의 응력 상관관계)

  • Kim Seong-Min;Cho Byoung-Hooi;Ryu Sung-Woo
    • International Journal of Highway Engineering
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    • v.8 no.3 s.29
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    • pp.143-153
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    • 2006
  • The differences in the stress distribution and the critical stresses in concrete pavement systems were analyzed when the dual-wheel single-, tandem-, and tridem-axle loads were applied at the interior and the edge of the pavement. The effects of the concrete elastic modulus, slab thickness, foundation stiffness, and tire contact pressure were investigated. The stresses under the interior loads were calculated using the transformed field domain analysis and stresses under the edge loads were obtained using the finite element method. The critical stresses under the interior and the edge loads were compared with respect to various parameters and the equations to predict the ratio between the stresses under the edge and the interior loads were developed and verified. From this study, it was found that the trends of the changes in the critical concrete stresses under the interior and the edge loads were very similar and the critical stress locations under those loads were identical. The critical stress ratio, which was obtained by dividing the critical stress under the edge loads into that under the interior loads, decreased with increasing the number of axles. That ratio became larger as the concrete elastic modulus increased, the slab thickness increased, the foundation stiffness decreased, and the tire contact pressure increased.

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A PHOTOELASTIC STUDY OF STRESS DISTRIBUTIONS AROUND SURROUNDING BONE TISSUES OF IMPLANTS DEPENDING UPON THE LENGTH OF IMPLANT FIXTURES SUPPORTING FIXED BRIDGES (고정성 가공의치를 지지하는 임프란트의 길이에 따른 임플란트 주위 골조직에서의 응력분산에 관한 광탄성 연구)

  • Bae Hyong-Su;Cho Sung-Am
    • The Journal of Korean Academy of Prosthodontics
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    • v.30 no.4
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    • pp.611-621
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    • 1992
  • The Present study was performed to evaluate the stress distribution patterns of bone tissues around two Branemark implant fixtures with varying lengths. Six models were used with the combination of 10mm, 7mm, 5mm Branemark implant fixture analogs. The load distribution characteristics of surrounding bone tissues were observed under 64kg vertical static loading on central part of fixed bridge using 2 dimensional photoelastic technique. Through observing the pattern of stress distribution around the implant fixtures, I got the results as follow : 1. Stress distribution pattern of model I(10mm, 10mm) was best among those of six models. 2. When two fixtures were in equal length, stress was increased in proportion to the reduction of implant surface area. 3. When two fixtures were in unequal length, stress was concentrated on the neck portion of the shorter one.

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