• 한국산학기술학회논문지
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• 제14권9호
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• pp.4580-4586
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• 2013

대부분의 학교 건물은 내진설계기준이 적용되기 이전인 1988년 이전에 설계되었으며, 이후에 지어진 학교의 경우도 내진설계 적용대상에서 제외된 5층 이하의 건물로서 내진성능이 없을 것으로 판단된다. 건물의 특성상 많은 아이들이 밀집하여 있고, 재난 시 대피시설로 이용된다는 점에서 학교 건물의 내진성능보유는 특히 중요하다. 본 연구에서는 우리나라 학교건물의 대표적인 유형을 모델구조물로 선정하여 학교건축물에 대한 내진성능 평가를 수행하였다. 보유강도와 보유성능을 기초로 내진성능을 평가한 결과 모두 내진성능이 미흡한 것으로 나타났다.

• Structural Monitoring and Maintenance
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• 제2권3호
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• pp.269-282
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• 2015

Civil structures should be designed with the lowest cost and longest lifetime possible and without service failure. The efficient and sustainable use of materials in building design and construction has always been at the forefront for civil engineers and environmentalists. Timber is one of the best contenders for these purposes particularly in terms of aesthetics; fire protection; strength-to-weight ratio; acoustic properties and seismic resistance. In recent years, timber has been used in commercial and taller buildings due to these significant advantages. It should be noted that, since the launch of the modern building standards and codes, a number of different structural systems have been developed to stabilise steel or concrete multistorey buildings, however, structural analysis of high-rise and multi-storey timber frame buildings subjected to lateral loads has not yet been fully understood. Additionally, timber degradation can occur as a result of biological decay of the elements and overloading that can result in structural damage. In such structures, the deficient members and joints require strengthening in order to satisfy new code requirements; determine acceptable level of safety; and avoid brittle failure following earthquake actions. This paper investigates performance assessment and damage assessment of older multi-storey timber buildings. One approach is to retrofit the beams in order to increase the ductility of the frame. Experimental studies indicate that Sprayed Fibre Reinforced Polymer (SFRP) repairing/retrofitting not only updates the integrity of the joint, but also increases its strength; stiffness; and ductility in such a way that the joint remains elastic. Non-linear finite element analysis ('pushover') is carried out to study the behaviour of the structure subjected to simulated gravity and lateral loads. A new global index is re-assessed for damage assessment of the plain and SFRP-retrofitted frames using capacity curves obtained from pushover analysis. This study shows that the proposed method is suitable for structural damage assessment of aged timber buildings. Also SFRP retrofitting can potentially improve the performance and load carrying capacity of the structure.

• 한국전산구조공학회논문집
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• 제35권4호
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• pp.235-242
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• 2022

시공 중인 건물은 시공이 완료된 건물과는 다르게 콘크리트의 강도발현이 충분히 이루어지지 않았기 때문에 지진과 같은 자연재해에 더 취약한 모습을 가질 수 있다. 현재 국내 기준은 건축물의 내진등급별 최소성능 목표를 제시하고 있지만, 설계를 위한 지진하중은 재현주기 2,400년의 지진위험도를 기반으로 한다. 하지만 건물의 시공기간은 건물의 사용기간보다 훨씬 짧기 때문에 재현주기 2,400년의 지진을 시공 중인 건물에 적용하는 것은 과도하다. 따라서 이 연구는 주거용으로 사용되는 철근콘크리트 건물의 시공 중 지진하중을 분석하기 위해 5층, 15층, 25층, 60층 건물의 시공단계모델을 작성하고 재현주기에 따라 저감한 지진하중을 적용하여 구조적 안정성을 확인하였다. 그 결과, 시공기간에 따라 선정한 재현주기의 지진을 적용할 때 구조적 안정성을 확인하였으며, 건물의 규모의 따라 구조적 안전성을 확보할 수 있는 지진재현주기를 확인하였다.

• 국제초고층학회논문집
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• 제5권3호
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• pp.187-193
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• 2016

Busan's Haeundae Resort project, which is currently being constructed by POSCO E&C, comprises the 101-story Landmark Tower and two 85-story residential towers. Presently, foundation and basement construction is complete, with a final completion date set for 2019. Considerations about the construction and design of the three reinforced concrete high-rise buildings will be discussed in this paper.

• Structural Engineering and Mechanics
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• 제38권2호
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• pp.249-259
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• 2011

Band windows are commonly used in reinforced concrete structures for the purpose of ventilation and lighting. These applications shorten the lengths of the columns and, consequently, they are subject to higher shear forces as compared with those of hollow frames. Such short columns may cause some damages during earthquakes. Hence, these effects of short columns should be minimized by choosing the dimensions of the band windows properly in order to prevent serious damages in the structure. This can be achieved by taking into account the parameters that are crucial in causing short column effect. Hence, in this study, the effects of those parameters such as the widths and heights of the band windows, the number of bays and storeys within the frame, and the heights of storeys are examined. The effects of the parameters are analyzed using time history analysis. One of the important results of these analyses, is that, the widths of the band windows should be less than 60% of the clear span between the columns, whereas, their heights should be greater than 35% of the clear storey height in order to decrease the short column effects substantially during the design of the reinforced concrete structures.

• 콘크리트학회지
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• 제26권5호
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• pp.42-46
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• 2014

• 콘크리트학회지
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• 제7권3호
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• pp.12-23
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• 1995

• 콘크리트학회지
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• 제13권5호
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• pp.49-56
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• 2001

• 콘크리트학회지
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• 제4권2호
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• pp.20-28
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• 1992

• Steel and Composite Structures
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• 제23권1호
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• pp.95-105
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• 2017

The use of superelastic shape memory alloys (SMAs) as reinforcements in concrete structures is gradually gaining interest among researchers. Because of different mechanical properties of SMAs compared to the regular steel bars, the use of SMAs as reinforcement in the concrete may change the response of structures under seismic loads. In this study, the effect of SMAs as reinforcement in concrete structures is analytically investigated for 3-, 6- and 8-story reinforced concrete (RC) buildings. For each concrete building, three different reinforcement details are considered: (1) steel reinforcement (Steel) only, (2) SMA bar used in the plastic hinge region of the beams and steel bar in other regions (Steel-SMA), and (3), beams fully reinforced with SMA bar (SMA) and steel bar in other regions. For each case, columns are reinforced with steel bar. Incremental Dynamic Analyses (IDA) are performed using ten different ground motion records to determine the seismic performance of Steel, Steel-SMA and SMA RC buildings. Then fragility curves for each type of RC building by using IDA results for IO, LS and CP performance levels are calculated. Results obtained from the analyses indicate that 3-story frames have approximately the same spectral acceleration corresponding with failure of frames, but in the cases of 6 and 8-story frames, the spectral acceleration is higher in frames equipped with steel reinforcements. Furthermore, the probability of fragility in all frames increases by the building height for all performance levels. Finally, economic evaluation of the three systems are compared.