In this study, we focus on the feasibility of structural topology optimization for a steel-timber composite beam design of optimally allocating glue-laminated timbers into a web with openings under the condition of given steel flanges. The motivation of this study is to topologically take maximal stiffness harmonizing both tension and compression performance of the steel-timber composite beam and become the eco-frandly timber design for buidling members. As a result of this study, the key web-openings allocation becomes triangle spaces, i.e., empty or no materials, of optimal topologies of both a pure timber plate and a steel flange-web timber plate without web-openings. Several applicable examples verify the effectiveness of topology optimization for steel-timber beams with web-openings.

In this study, an experimental study was carried out to evaluate the bond shear performance according to the shear connector between the glue-laminated timber and steel interface. Ten block shear specimens were fabricated according to the configuration of the adhesive surface of wood and steel. In addition, four test specimens were produced according to the main variable shape of the wood-concrete shear connector. As a result of the block shear test, the shear strength of the steel-wood adhesive is shown to have a shear performance greater than the wood-wood shear strength. As a result of the push-out test according to the shape of the shear connector, the shear strength increased linearly with the attachment area. The complete composite behavior between the glued-laminated timber and the steel can be secured.

Synthetic wood has been widely used in place of wood such as the building exterior materials and/or the floor plate of moving path. However, it has many disadvantages such as relatively low strength, low durability, and heavy weight, etc. In this study, the synthetic wood deck combined with an aluminum profile was suggested to overcome these disadvantages. The flexural strength of the aluminum-synthetic wood deck was obtained through the theoretical equations under three-point bending conditions. In addition, the finite element analyses were also conducted to evaluate the flexural strength of the aluminum-synthetic wood deck.

Most of the cultural assets in Korea are wooden structures. Due to the material characteristics of wood, the preservation of traditional wooden structure is impossible by simple maintenance. Damaged member is replaced with new member or completely dissolve and restore them. But member has a cultural value, so that it is impossible to arbitrarily replace each member. Although the preservation treatment method using synthetic resin is emphasized, there is no exact standard for proper reinforcement ratio. This paper is experimental study for reinforcement ratio of wooden flexural member with synthetic resins, Reinforced ratio on section area of flexural member. As a result, synthetic resin reinforcement are selected as experimental variables by proper ratio enhanced flexural capacity of reinforced wooden member than new wooden member.

Preservation of wooden structure due to deterioration and corrosion is based on preservation of original form, and wooden member should not be arbitrarily replaced or damaged. Accordingly, preservation processing method with synthetic resins is embossed. But it has an adverse effect because there is no exact standard for the reinforcement ratio with the synthetic. This paper experimental study for reinforcement ratio of wooden compressive member with synthetic resins, Reinforced ratio on section area of compressive member and direction. As a result, synthetic resin reinforcement selected as experimental variables by proper ratio enhanced compressive capacity of reinforced wooden member, than new wooden member.

The functional wood plastic composite(WPC) is one of the noted materials for landscape architecture and residential construction. Iron band, embossing and drain holes are improve the strength and skid resistance of the WPC. In this study, we had developed an automatic manufacturing system for the functional WPC that has vertical pattern embossing and drain holes. The system is consist of an automatic vertical pattern embossing device, multi-spindle drilling M/C, sanding device, inspection equipment, and some facilities developed in the previous research. The performance tests on the several functional items of the system and manufactured WPC represented satisfactory values except the skid resistance and absorption thickness expansion rate.

In this study, we have developed an automatic manufacturing system for functional wood plastic composites(WPC) which are one of spotlighting materials for landscape architecture and residential construction material. In addition to the existing facilities, this manufacturing system is consist of an automatic hole manufacturing device, iron band supply and winding device, mold with the iron band insert system, calibration unit, control system, etc. We have performed the performance tests for the system such as the specific gravity, bending strength, screw holding power, percentage of moisture content, formaldehyde, absorption thickness, expansion rate, cold resistance(appearance & bending strength), and shock resistance. As a result, the performance of the prototype system satisfies all the objects of this study.

최근 문화유산에 대한 관심이 고조 되면서 노후화된 건조물문화재의 보존에 대한 중요성이 대두되고 있다. 건조물문화재의 대부분이 목재를 주재료로 사용하였으며, 이들 건조물문화재의 노후화에 따른 부식 및 손상에 대한 보존수리는 부재자체의 문화재적 가치를 고려하여 원형유지를 기본원칙으로 한다. 이에 따라, 합성수지를 이용한 보존처리방법이 부각되고 있다. 이에 본 논문은 합성수지로 보강한 원형단면 목재의 압축보강 성능에 관한 실험적 연구로서 합성수지의 보강단면적비율, 단면의 보강방향, 보강길이, 합성수지강도를 변수로 하여 총 14개의 시험체를 제작하여 실험하였다. 실험결과 합성수지를 이용하여 적절하게 보강할 경우 신재이상의 보강효과가 있는 것으로 나타났으며 문화재의 보수 및 보강에서 가장 중요한 오센티시티(authenticity)를 확보할 수 있을 것이다.

This paper aims at developing an environmentally friendly modular dome structure system with highly filled extrusion wood-plastic composite (WPC) member, and manufacturing a real-size specimen by modularizing members and nodes. The member used in the model is the WPC member with 70% wooden fiber contests, which is higher then previous WPC one. Its members and nodes are modularized by analyzing geometric characteristics of icosahedral-based geodetic dome. Applicapability of the 6ea prototype nodes and 3ea prototype members to the modular dome is examined with the results of the modulaization and the making process for the real-size specimen. Besides, from the analysis results, the lowest buckling mode is expected to be a nodal buckling on a node near the boundary.

This study investigates the geodesic dome based on an icosahedron and development of joint modules that make up a dome structure in order to model the modular dome using the wood-plastic composite member with 70% of wooden fiber contests. The purpose of this work is used as a basis for verification of structural performance of WPC in the real structures.

건조물문화재의 부식 및 노후화에 대한 보존수리는 원형유지를 기본원칙으로 하며, 수리로 인해 인위적인 훼손을 가하는 과오를 범해서도 안 된다. 따라서 합성수지를 이용한 보존처리방법이 부각되어지고 있다. 본 연구의 목적은 합성수지로 보강한 사각단면 목재의 휨 성능에 관한 연구로서 합성수지의 보강길이, 보강면적비율, 합성수지 재료강도, 보강위치를 변수로 하여 총 11개의 시험체를 제작하여 실험하였다. 이 연구의 결과는 목재의 휨 보강재로 합성수지의 보강효과가 있는 것으로 나타났으며, 사용 가능성을 확인할 수 있었다.