• Structural Engineering and Mechanics
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• 제22권4호
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• pp.449-467
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• 2006

Most existing concrete structures in Taiwan are considered nonductile due to insufficient transverse reinforcement and poor detailing of frame elements. Such features are fairly typical for buildings constructed prior to 1997, at which time the local building code was revised based on ACI 318-95. Among these structures, many contain perimeter or partition walls made of concrete or clay brick for architectural purposes. These walls, though treated as non-structural components in common design practice, could affect the structural behavior of the buildings during an earthquake. To study the behavior of such structures under seismic load, experiments were conducted on concrete frames of various configurations to show the force-deformation relationships, damage patterns, and other characteristics of the frames. For further interest, similar units with columns jacketed by carbon-fiber-reinforced-polymer (CFRP) were also tested to illustrate the effectiveness of this technique in the retrofit of concrete frames.

• Earthquakes and Structures
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• 제9권5호
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• pp.999-1028
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• 2015

Despite the fact that the fundamental period appears to be one of the most critical parameters for the seismic design of structures according to the modal superposition method, the so far available in the literature proposals for its estimation are often conflicting with each other making their use uncertain. Furthermore, the majority of these proposals do not take into account the presence of infills walls into the structure despite the fact that infill walls increase the stiffness and mass of structure leading to significant changes in the fundamental period numerical value. Toward this end, this paper presents a detailed and indepth analytical investigation on the parameters that affect the fundamental period of reinforce concrete structure. The calculated values of the fundamental period are compared against those obtained from the seismic code and equations proposed by various researchers in the literature. From the analysis of the results it has been found that the number of storeys, the span length, the stiffness of the infill wall panels, the location of the soft storeys and the soil type are crucial parameters that influence the fundamental period of RC buildings.

• 한국전산구조공학회논문집
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• 제22권4호
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• pp.355-362
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• 2009

국내에 많이 건설되고 있는 빌라형 주택은 건축적인 요구를 위하여 저층부에 필로티를 두고 있는 경우가 많다. 구조물 상층부의 비내력벽에 의하여 저층에 연약층을 유발하고 따라서 지진에 매우 취약하다. 그러나 설계시 일반적인 설계방법과 동일하게 상부층의 칸막이벽은 비구조체로 간주되어 무시된다. 그러므로 설계단계에서 무시되는 비내력벽의 유무에 따라서 건축물이 어떠한 지진거동의 차이점을 보이는지 살펴볼 필요가 있다. 본 연구에서는 대상 건축물의 지진취약도 해석을 통하여 비내력벽의 유무에 따른 건축물의 지진거동을 평가하였다. 비내력벽의 유무에 따른 동일한 골조를 가지는 저층 철근콘크리트 건축물을 적용하여 지진거동에서 비내력벽의 영향을 평가하였다. 비내력벽은 보편화된 모형화 방법인 등가의 대각 압축 스트럿으로 고려하였다. 골조만 있는 모델과 연약층이 있는 모델의 취약도곡선을 비교하였다. 해석 결과로 연약층이 있는 RC 건물의 내진성능은 설계기준에서 제시하고 있는 성능수준을 만족하지 못하며 지진에 취약함을 보여준다.