홍갑표 교수

Abstract Drift design methods based on resizing algorithms are presented to control lateral displacements of steel‐frame shear‐wall systems for tall buildings. Three algorithms for resizing of structural members of the steel‐frame shear‐wall systems are derived by formulating the drift design process into an optimization problem that minimizes lateral displacement of the system without changing the weight of a structure. During the drift design process, cost‐effective displacement participation

When a concrete structure is exposed to heat such as a fire, its material properties, such as weight, compressive strength and elasticity, are degraded. The exposure also accompanies cracking, spalling and color changes. Therefore, a structure's quantitative damage assessment is very critical in determining whether to dismantle or strengthen the structure after a fire. The purpose of this study is to consider the color change of heat exposed concrete as a major parameter in conjunction with mate

A practical data recovery method is proposed for the strain data lost during the safety monitoring of mega columns. The analytical relations among the measured strains are derived to recover the data lost due to unexpected errors in long-term measurement during construction. The proposed technique is applied to recovery of axial strain data of a mega column in an irregular building structure during construction. The axial strain monitoring using the wireless strain sensing system was carried out

A strain-based load identification model for beam structures subjected to multiple loads is presented. The number of sensors for the load identification model is the same as the number of load conditions acting on a beam structure. In the model, the contribution of each load to the strains measured by strain sensors is defined. In this paper, the longitudinal strains measured from multiplexed fiber Bragg grating (FBG) strain sensors are used in the load identification. To avoid the dependency on

Abstract It is well known that the weight of the structural system for a high‐rise building to resist lateral loads increases in nonlinear fashion with increase in building height and slenderness ratio. For a given building height or slenderness ratio, the weight of the structural system for a high‐rise building subjected to lateral loads depends on the degree of stiffness of the building structure. Therefore, at the final stage of the structural design process, it has been a challenge to struct

In Korea recently, interest is increasing in slim floor systems that have superior structural performance and fire resistance. This paper contains the results of tests to confirm the fire resistance behavior of the composite asymmetric slim floor beam. The fire resistance behavior was analyzed using the finite element program ANSYS and the finite element models were validated against the test results. The validated thermal and structural models were used to predict the fire resistance of the Kor

The structure systems of slab in the steel structure to increase the efficiency of the internal structure system use the long span and the lightweight construction materials. However, the floor structure system with the long span and the lightweight materials will increase the response of the vibration by the people's walking, the vibration of equipment/facilities, and the other impact force. Because the response of the vibration according to the serviceability of the building is increasing, eff

The serviceability evaluation methods regarding floor vibration can be found in foreign building codes or design guides regarding vibration. NBC, LRFD, ISO, DIN, and AISC Design Guide #11 are such examples. However, because the foreign vibration evaluation methods are based on each country's research results, they use partially different tolerance levels or evaluation scales, and thus, at times, produce different evaluation results for the same conditions. Under such circumstances, our country h

비대칭 슬림플로어 합성보(Asymmetric Slimfloor Beam, 이하 ASB)는 비대칭 형강의 일부를 콘크리트슬래브에 삽입한 합성보로서, 유럽에서 개발되었다. 근래 국내에서도 건축물의 층고저감, 물량감소, 내화성능 증대 등의 목적으로 ASB의 연구가 진행되고 있다. 본 연구에서는 실험을 통하여 ASB의 내화성능을 확인하고, 열전달해석을 통하여 내화성능 시간에서의 모멘트 내력(Moment capacity)을 산정하였다. 그결과를 바탕으로 방화석고보드와 ASB로 구성된 3시간 내화구조를 선정하고, 내화 성능을 검토하였다.

In this study, the genetic algorithm based optimal structural design method is proposed. The objective functions are to minimize the cost and CO2 emissions, simultaneously. The cost and CO2 emissions are calculated based on the cross-sectional dimensions, length, material strength, and reinforcement ratio of beam and column members. Thus, the cost and CO2 emissions are evaluated by using the amounts of concrete and reinforcement used to construct a building. In this study, the cost and CO2 emiss

This study suggests a joint design using an X-brace bar to identify the stability and structural performance of a precast concrete (PC) beam-column joint design, which may cause problems when used in a segmented PC beam system for a long-span structure. For this, an experimental PC beam-column model at half scale was designed and veri­fied for applicability of X-braced bars in a panel zone. While previous studies suggested the development of a long-span structural system using precast concrete (

Floor structure system with long span and lightweight material increases vibration response by people's jumping and heel drop, etc. To achieve comfortable serviceability of residents in a building, excessive vibration response is needed to be reduced by taking effective method, rather than increasing stiffness, which causes enlarging the size of structural members. Increasing stiffness method takes a lot of costs, so we need to find another method. The most effective method is increasing structu