• Journal of Korean Association for Spatial Structures
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• v.7 no.2 s.24
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• pp.75-82
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• 2007

Building costs means capital costs which include cost of land, cost of acquiring and preparing the site, construction costs, engineering fees, furnishings, cost of financing the project, and cost of management required to run and maintenance the building for use. An economic analysis is one of the most important factor to determine the project feasibility. The purpose of the this study is to analysis on the construction cost structure of steel truss stadium.

• Proceedings of the Korean Society of Disaster Information Conference
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• 2017.11a
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• pp.197-198
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• 2017

인공재해와 자연재해로 인해 발생하는 비정상 하중에 의해 국부손상이 발생된 철골 교량 구조물은 추가적인 2차 붕괴의 위험요소들을 내재하고 있어 신속한 전면 해체가 요구된다. 본 시공 사례는 건설실패와 태풍 및 지진으로 국부손상이 발생된 철골 트러스 구조의 교량의 긴급해체를 위해 발파해체 공법을 적용한 사례이다. 철골 부재의 절단을 위해 성형폭약이 필요하지만 현지에서 수급이 불가능한 상태이기 때문에 장약용기를 직접 제작하고 에멀젼 폭약을 충전하여 만든 성형폭약을 이용하여 발파해체에 적용하였다. 직접 제작한 성형폭약을 이용하여 발파해체한 결과 철골 부재가 정확히 절단되면서 교량의 중앙부가 수직자유낙하하고, 교량의 양 끝단은 지지부를 중심으로 회전낙하 하였다. 또한 존치 구조물 및 주변에 피해가 발생하지 않았으며, 발파 후 파쇄 상태는 매우 양호하였다. 이로 인해 직접 제작한 성형폭약의 절단 성능을 확인할 수 있었으며, 신속하고 안전하게 국부손상이 발생된 구조물을 해체하였다.

• Computational Structural Engineering
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• v.6 no.2
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• pp.13-16
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• 1993

본 고에서는 철골 구조물에 있어서 일어나고 있는 좌굴에 대해, 현재 외국에서 진행중인 연구의 일부를 소개하였다. 이들의 기본 개념은 좌굴이 일어날 수 있는 압축부재에 있어서 최대내력, 즉 좌굴이 일어나기 이전에 부재를 압축에 대해 항복시킴으로써, 좌굴을 방지하려는 연구의 일종으로서, 부재의 강도면에 있어서는 큰 손실이 뒤따르게 된다. 하지만, 트러스 등의 구조물에 있어서 압축보다 인장에 대해서 사전에 항복하도록 설계(선인장 항복설계)가 이루어진 경우일지라도, 인장항복만으로 붕괴기구가 형성된다. 또한, 일반적으로 트러스를 제작함에 있어서 시공상의 오차가 발생할 가능성이 상존하고 있으며, 부정확하게 시공된 구조물에 있어서는 설계시 상정된 파괴기구와는 다른 형태의 파괴기구가 형성될 가능성이 있다. 따라서, 안정항복하여 큰 소성변형이 필요한 경우에는 상기의 방법이 유효하다고 사료된다. 한편 본 고에서 예로 다루고 있는 2중 강관구조에 있어서는, 외관과 내관의 단면적비가 약 1:1.5 정도이며, 보강재로 사용되는 내관을 아무리 저급의 제품을 사용한다해도 불경제적이 될 가능성이 크다. 따라서 금후, 내관의 단면 결정을 위한 많은 연구가 이루어져야 한다고 생각한다.

• Journal of the Korean Society for Nondestructive Testing
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• v.31 no.4
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• pp.335-342
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• 2011

Application of FBG (Fiber Bragg Grating) sensors to measure strain of steel roof trusses has been performed. This is to check and confirm the structural integrity of an unusually shaped, reverse shell structure made of reinforced concrete. The issue was to place sensors at proper location and compare the measured values to the results from structural analysis. It has been learned that a deliberate measurement scheme is needed in order to monitor a complex structure during construction. In this study, the measured values were within allowable range of strain, thus confirming the safety of the structure during measurement and construction.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.30 no.5
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• pp.397-404
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• 2017

The purpose of this study is to evaluate the seismic performance of Staggered Truss Frame(STF) system while changing a shape of truss. The model of this project is a office building of ten floors with Pratt, Howe, Warren, K and Vierendeel truss system applied on each model. Next step is to select the section of elements which satisfy the highest demand capacity ratio by structure design considering gravity load, earthquake load and wind load and then calculate natural period, base shear and story drifts. On the basis of these values, Capacity Spectrum Method(CSM) shows the plastic behavior of STF system such as performance point of Design Earthquake(DE) and Maximum Considered Earthquake(MCE), yield state, plastic hinge etc. to be compared with other truss systems. As a result, Vierendeel STF system especially was found to have the highest strength and stiffness to the corresponding earthquake and all the models for each truss shape fulfilled the target performance level.

• Explosives and Blasting
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• v.36 no.1
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• pp.20-33
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• 2018

A locally damaged structure is a structure that cannot be reused due to having parts that have lost their structural function as a result of abnormal load across the interior or exterior of the structure. The causes of the abnormal load occurrences can be classified into natural disaster and artificial disaster. Locally damaged structures caused by this abnormal load have risk factors that may lead to the possibility of additional secondary collapses, so such structures require immediate and complete dismantling. The case presented in this study involves the application of explosive demolition to a steel truss structured bridge in the Philippines that was damaged due to construction failures and the hurricane. Although shaped charges were needed in explosive demolitions, difficulties in locally obtaining such material. So, we made a charge container to charging of emulsion explosive during the explosive demolition. The explosive demolition resulted in the vertical free fall of the mid-section of the bridge and the free fall rotating of the both end section of the bridge. The neighboring posts and bridge piers did not show signs of damages, while post-demolition fragmentation of removed parts was found to be satisfactory.

• 한국공간정보시스템학회:학술대회논문집
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• 2004.05a
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• pp.255-263
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• 2004

광명시 경륜 경기장은 국민 체육진흥공단에서 턴키(Turn key)공사로 발주하였고, CS구조+공간건축+대우건설, 삼성건설, 태영건설의 제출안이 당선되어 현재 시공중에 있다. 경기장의 저층부는 PC로 설계되었고, 지붕은 철골 트러스를 사용한 Dome 형상으로 이루어져 있다. 돔 지붕의 개념은 지붕에 물을 부었을 때 가장 흘러가기 쉬운 방향으로 트러스를 배치하여 유연한 힘의 흐름을 유도하는 것이다. 143.6m(폭)${\times}$183.5m(길이)${\times}$21m(높이)의 지붕엔 지붕의 개념인 Flow Truss를 물이 흐르는 방향의 방사형으로 배치하고, 내부에 압축링(Compression Ring Truss)과 외부에 인장링(Tension Ring Truss)를 설치하여 힘의 흐름을 단순화시켰고, 실내에서 보기에 플로우 트러스의 간격을 넓게 유지함으로써 개방감을 극대화시켰다. 또한 Flow Truss는 동일한 곡률과 길이로 설계하여 표준화시킴으로써 시공성과 경제성을 동시에 만족토록 하였다. 현재 저층부 시공은 거의 완료된 상황이고, 곧 지붕을 설치할 예정이다. 본 고에서는 돔 지붕의 형성 개념과 설계 과정을 살펴보고, 접합상세 등의 해결에 대해 살펴보겠다.

• Journal of Korean Society of Steel Construction
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• v.12 no.5 s.48
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• pp.503-513
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• 2000

This study treats the criteria, considering the fuzziness occurred by optimization design. And we applied two weighting methods to show the relative importance of criteria. This study develops multi-objective optimization programs implementing plain stress analysis by FEM and discrete optimization design uniformaly. The developed program performs a sample design of 10-member steel truss. This study can carry over the multi-objective optimization based on total system fuzzy-genetic algorithms while performing the stress analysis and optimization design. Especially, when general optimization with unreliable constraints is cannot be solve this study can make optimization design closed to realistic with fuzzy theory.

• Journal of Korean Society of Steel Construction
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• v.21 no.1
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• pp.37-44
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• 2009

A truss deck system that has replaced the slab form conventional method has become widely used in the construction of reinforced concrete structures as well as steel structures. The current commercial products, however, have some problems. The discontinuity between the lattice wires on the joint of the bottom wire induces vierendeel behavior, which increases the deflection of the system. In this research, a new truss deck system with continuous lattice wires on the level of the bottom wire was developed to reduce the system's vierendeel behavior and to improve its deformation capacity. To investigate the system's structural behavior, an experimental test and an analysis were performed. The main parameters of the test and analysis were the longitudinal shape and spacing of the lattices. To simulate the loading condition in the construction field, uniform construction loads were directly applied on the deck plates of the analysis model and the test specimens. The results of such analysis and test revealed that the longitudinal shape of the lattice wires is a major factor affecting the structural behavior of a steel wire truss deck. Thus, continuous lattice wires could result in decreased vierendeel behavior in the steel wire truss deck. It was also found that the truss deck system with lattices spaced longer than in the conventional products could be effectively used without increasing the member stresses.

• Journal of the Korea Society of Computer and Information
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• v.14 no.1
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• pp.65-72
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• 2009

This study presents a structural design optimizing sizes of high-rise steel plane truss members by maximizing stiffness subjected to given volume constraints. The sizing optimum design is evaluated by using a well-known optimality criteria (OC) of gradient-based optimization methods. In typical size optimization methods, truss structures are optimized with respect to minimum weight with constraints on the value of some displacement and on the member stresses. The proposed method is an inversed size optimization process in comparisons with the typical size optimization methods since it maximizes stiffness associated with stresses or displacements subjected to volume constraints related to weight. The inversed approach is another alternative to classical size optimization methods in order to optimize members' sizes in truss structures. Numerical applications of a round shape steel pipe truss structure are studied to verify that the proposed maximum stiffness-based size optimization design is suitable for optimally developing truss members's sizes.