Tohoku University · 공학
Xu Chen 교수의 연구실은 주로 고지대 및 지진 활동이 높은 사면지역의 고경간교의 지진 성능을 연구하며, 특히 고경간의 고유진동수 모드 영향, near-fault 지진동 특성, 그리고 복합적 구조요소(예: 링크 빔, 롤링 기초, 에너지 흡수 장치)의 영향을 분석합니다. 다단계의 실험적(진동대 시험)과 수치적(위험도 분석, 최적화 모델링) 접근을 통해 높은 경간 다단위 경간교의 내진 설계 및 복원성 향상을 목표로 합니다. 특히 고경간교의 비선형 거동과 지진 동적 반응에 대한 종합적 이해를 기반으로 한 실용적 설계 지침 개발에 기여하고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
More than 40% of the bridges in mountainous areas of Southwest China are constructed with piers having a height of over 40 m. Such piers are characterized by large structural flexibility and distributed mass. To investigate the effects of higher modes on the seismic performance of this class of bridges, shake table tests on two 1/7-scale, tall-pier models were conducted at Tongji University, Shanghai. This paper describes the design, instrumentation, and loading protocols for the tests and discu
Numerous bridges with piers over 40 m are constructed in Southwest China, which is known as a region of high seismicity. In current research, this type of bridge is commonly simplified as a single-column system, and researchers mainly focused on how seismic performance is affected by the higher modes of columns. This study aims to investigate the seismic behavior of the entire system of tall-pier bridges subjected to near-fault ground motions, using probability-based fragility analysis. A numeri
Abstract Seismic performance of double‐column tall pier bents has to date scarcely been investigated. The deployment of link beams between columns, including numbers and locations, is generally designed according to the experience of engineers, without any sophisticated procedure. This paper proposes a response surface‐based optimization procedure that searches for optimal configurations of link beams of double‐column tall pier bents, considering multiple performance objectives. The response sur
More than 40% of bridges in Southwest China have piers over 40 m height. The seismic behaviour of these bridges is critical, especially exposed to near-fault pulse-like ground motions. This paper conducts fragility analyses to assess the seismic vulnerability of tall pier bridges under near-fault motions. Fragility curves are developed for a typical 50-m tall pier and a 10 m conventional pier with probabilistic seismic demand models (PSDMs). When developing the PSDMs, curvature ductility at pier
While conventional seismic isolation bearings are usually inefficient for bridges with tall piers, rocking foundation is a promising approach mitigating their seismic demands and improving post-earthquake resilience. However, excessive tilt angle might occur at rocking interface and lead to overturning during strong earthquake excitations. This paper investigates the efficiency of various energy dissipation devices in improving the seismic performance of rocking foundations employed in tall pier
