횡-비틀림 거동하는 고차모드 지배 저층구조물의 내진보강 전략
Seismic Retrofit Strategy Reducing Torsion-Induced Higher Mode Effects of Torsionally-Coupled Low-Rise Buildings
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초록
저층 건축물의 횡-비틀림 거동은 고차모드 효과를 증폭시킬 수 있으며, 내진성능평가 시 관련 기준은 고차모드 지배 구조물에 대해 비선형정적해석과 함께 선형동적해석을 추가로 수행하도록 규정하고 있다. 선형동적절차에는 상당한 안전계수가 적용되므로, 이는 과도한 내진보강설계로 이어질 수 있다. 이를 방지하기 위해 엔지니어들은 내진보강 시 고차모드 효과를 줄이기 위해 시행착오법을 사용해 왔다. 그러나 시행착오법에는 많은 시간과 노력이 소요되며, 결정된 보강안이 최적인지 확인하기 어렵다. 본 연구는 저층 건축물의 수학적 모델을 수립하고 응답스펙트럼해석을 통해 고차모드 효과에 비틀림이 독립적으로 미치는 영향을 파악하였다. 이를 바탕으로 효율적인 내진보강 설계를 위해 활용될 수 있는 도표와 절차를 제시하였다. 제시된 절차를 통해 최소한의 내진보강으로 횡-비틀림 거동하는 저층 건축물의 고차모드 효과를 효율적으로 감소시킬 수 있음을 확인하였다.
Abstract
The lateral-torsional behavior of low-rise buildings may amplify higher mode effects, requiring both nonlinear static and linear dynamic analyses for seismic performance evaluation according to relevant standards. The linear dynamic procedures involve significant safety factors, unintentionally leading to excessive seismic retrofitting designs. Engineers have employed trial-and-error methods to mitigate higher mode effects during seismic retrofit design. However, this approach requires substantial time and effort, and it is challenging to verify the optimality of the retrofit solutions. The current study establishes a mathematical model of low-rise buildings and conducts response spectrum analysis to independently assess the influence of torsion on higher mode effects. Based on these investigations, this study presents graphs and procedures that can be utilized for efficient seismic retrofit design. The proposed procedures demonstrate that the higher mode effects in low-rise buildings exhibiting lateral-torsional behavior can be reduced with minimal seismic retrofit.
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