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박종면 ( Jong Myen Park ),이상열 ( Sang Youl Lee ),지효선 ( Hyo Seon Ji ),손병직 ( Byung Jik Son ) 한국복합신소재구조학회 2014 복합신소재학회논문집 Vol.5 No.1
This study analyzes performance-cost ratio of composite(GFRP) wind-towers by fiber reinforcement angle and determines their optimal fiber angle. The finite element models for composite structures using the ANSYS program described in this paper is attractive not only because it shows excellent accuracy in analysis but also it shows the effect of the geometrical combination. New results reported in this paper are focused on the significant effects of the cost for various parameters, such as thicknesses of outer shells and stiffeners. From the numerical examples, optimal fiber angles were determined as 80°∼90°.
단부격벽 일체형 PSC거더를 갖는 반일체식 교량의 시공성 연구
박종면 ( Jong Myen Park ),김진배 ( Jin Bae Kim ),전성용 ( Sung Yong Jun ),김층식 ( Chuang Sik Kim ),유성근 ( Sung Kun You ),박중배 ( Joong Bai Park ),임정훈 ( Jung Hoon Lim ) 한국복합신소재구조학회 2014 복합신소재학회논문집 Vol.5 No.2
This paper introduces general concepts of jointless bridges and field construction case of semi-integral bridge with psc girder integrating end-diaphragm. The expansion joints need to satisfy thermal and safety conditions of bridges. General bridges with joints have some problems, which are frequently replacement cycle time from mechanical damage or unstable movement, maintenance cost and more. To solve these problems, Integral Abutment Bridges(IAB) have been applied overseas in the 1930s. In Korea, first IAB was constructed in the early 2000s and precast IAB systems was invented and applied lately. Kyungshin overpass bridge in Incheon is the Semi-IAB constructed, the span length is 2@35=70m and the width is 13.9m. The original plan was to use general joint bridge but design field changed with expectations for advanced economic estimation and maintenance. This changed method of B.I.B bridge construction provided not only workability, construction cost but also safety improvement at the same time.
박종면 ( Jong Myen Park ),서현수 ( Hyun Su Seo ),권민호 ( Min Ho Kwon ),임정희 ( Jeong Hee Lim ) 한국복합신소재구조학회 2014 복합신소재학회논문집 Vol.5 No.1
In the study, tensile, compression and in-plane tests about longitudinal direction of glass fiber were performed. Also, to obtain the material properties of GFRP fabric composite, tensile test was performed. All test were performed by the test method of ASTM. Maximum compressive strength was smaller than the maximum tensile strength at the longitudinal direction test results. Elastic modulus of the tensile and compressive was almost similar at the compression test results in the longitudinal direction. Based on the GFRP fabric composite test results, GF91 was showed good performance at maximum compressive, maximum strain and elastic modulus.