In this study, the pseudo-excitation method is introduced to perform random spatial seismic response analysis of such a structure considering different damper arrangements. The analysis results show the effects of nonproportional damping characteristics due to these arrangements, and the nonproportional damping characteristic index can estimate the strength of these characteristics. Moreover, the virtual excitation method can be used to determine the weak parts of the structure.

Earthquake Engineering and ResilienceVolume 1, Issue 4 p. 389-392 ISSUE INFORMATIONFree to Read Issue Information First published: 28 December 2022 https://doi.org/10.1002/eer2.4AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Volume1, Issue4Decemeber 2022Pages 389-392 RelatedInformation

Abstract A hybrid structure constructed by replacing external steel beams and columns in the steel frame (SF) to precast concrete shear walls with insulation (PCSWs) and precast concrete cladding panels (PCCPs, SFPCSW) is proposed in this paper to avoid the problem of columns protruding from walls and PCCPs directly connected with SF. Numerical models of the SF and SFPCSW structures are established in ETABS software based on an 18‐story assembled steel residential building to investigate the seismic performance and collapse resistance capacity of SFPCSW. Time history analysis results show that the SFPCSW exhibits bending‐shearing lateral deformation and has more uniform interstory drift ratios than the SF. Under major earthquakes (i.e., probability of exceedance of 2% in 50 years), the damage of SF is concentrated in stories 1–6; for SFPCSW, the plastic hinges mainly appear in the concrete beams between PCSWs at each story, and the damage in PCSWs and the internal frame is small. Using pinned connections between the steel beam and PCSW reduces the structural lateral stiffness and increases the earthquake load carried by the internal frame. The incremental dynamic analysis results show that the SF and SFPCSW have similar collapse resistance capacities.

This study proposed a novel forced vibration model based on pipe vibration and 1D–3D coupling methods. The established model could evaluate the overall performance of the pumped storage power station system under forced vibration

Abstract We present seismic zoning maps of the National Capital Region (NCR) of India in terms of uniform hazard spectrum (UHS) amplitudes using three different attenuation equations to model the contributions of local earthquakes around the region and distant earthquakes in northwestern Himalaya (NWH) and Hindu Kush Subduction (HKS) sources. Our results show that the shape of design spectra must depend on the nature of contributing earthquake sources, their relative activity, the potential to create large magnitudes, and their geographical placement relative to the site selected for hazard computation. Our results also show that specifying strong motion amplitudes for use in engineering design by means of peak ground acceleration and a standard spectral shape may result in significant underestimation of intermediate and long‐period ground motions critical for buildings higher than four to five stories and hence should not be used. We present zoning maps for nine possible combinations of three different local geological site conditions (sediments, intermediate sites, and basement rock sites) and three different soil site conditions (“rock,” stiff soil sites, and deep soil sites). One of these maps can be readily used to extract the UHS amplitudes of the pseudo relative velocity spectrum (PSV) at any site in the NCR by specifying the local geological site‐condition parameters from a high‐resolution surface geological map of the region and determining the local soil site conditions by experiments limited to the site alone. The paper also provides a geological map of NCR on a scale of 1:1 million for a rough idea of the local geological parameters for a site of interest.

Abstract Real‐time hybrid simulation combines experimental substructure and numerical substructure and is an effective method to study the dynamic response of coupled vibrations on high‐speed railway. This paper constructs a semi‐active suspension‐train‐suspension bridge coupling real‐time hybrid framework and a real‐time hybrid simulation method based on a neural network is proposed, which uses a long‐short‐term memory model instead of a complex train‐bridge structure model, evaluates the prediction performance of the trained network models through time history, regression analysis, and normalization error distribution. Finally, the network model is applied to a real‐time hybrid simulation, the accuracy and real‐time ability of the method are verified, and the results show that the proposed method can effectively improve the accuracy and efficiency of solving the numerical substructure.

Abstract Infrastructure systems play a crucial role in ensuring the safety of cities and the well‐being of residents after earthquakes. Meanwhile, infrastructure systems are vulnerable to earthquakes and may fail to provide necessary services, highlighting the significant need to improve seismic emergency performance. Nevertheless, the seismic emergency performance of infrastructure systems still lacks effective enhancement strategies and optimization models, which makes it challenging to devise and benchmark appropriate emergency enhancement actions. This study proposes an emergency performance optimization model for infrastructure systems against earthquakes. The model aims at maximizing the effects of resistance actions and short‐term recovery actions on infrastructure systems with consideration of residents' expectations of infrastructure performance after earthquakes. The efficacy of the proposed model is tested by a case study in China. Experiments and results illustrate advantages of the seismic emergency performance optimization and prioritize resistance and short‐term recovery activities within constraints set by available resources.

Abstract Pulse‐like ground motions significantly influence structural responses, indicating that more consideration should be given to the seismic design of structures in the near‐site region. However, less effort focuses on the seismic response of a cable‐stayed bridge under near‐field pulse‐like excitations, and the difference in structural responses caused by near‐field pulse‐like and far‐field ground motions is not fully captured. This paper, therefore, aims to investigate the effect of pulse‐like ground motions on a cable‐stayed bridge, and it presents a comparison of far‐field earthquakes. Considering the finite number of recorded ground motions, artificial pulse‐like ground motions are adopted in this study. Furthermore, two classical intensity measures (peak ground velocity [PGV] and peak ground acceleration) were used to establish the probabilistic seismic demand model for cable‐stayed bridges. Then, fragility curves associated with the pylon of the bridge were compared under the action of different types of excitations, and the damage state of the whole pylon is presented through the median point of the slight damage of the curvature of each pylon section. The results indicate that the bottom section of the pylon is damaged first under different seismic excitations, with the PGV as the index. Moreover, far‐fault ground motions have a greater impact on the curvature response of the longitudinal bridge section of the pylon than the near‐fault ground motions, so the damage is more serious.

Abstract The Tsinghua Group of Earthquake Resistance on Dams has conducted seismic analysis and safety evaluation of concrete dams since the early 1980s. This paper reviews the recent developments achieved by the group, including source–media–structure simulation, dynamic experimental tests and mesoscale numerical simulation of concrete, and seismic response analysis and risk evaluation. In the end, the development trends of seismic safety evaluation are summarized, and the earthquake disaster chain of cascade dams is introduced.

Abstract Deep‐water bridges are susceptible to severe damages under strong earthquakes. Water–structure interaction will considerably affect the dynamic performance of deep‐water bridges. In the past few decades, researchers have conducted extensive studies on the water–structure interaction and dynamic behavior of bridges through theoretical, numerical, and experimental investigations. This paper presents a comprehensive review on the calculation method for earthquake and wave‐induced hydrodynamic forces. The seismic responses of deep‐water bridges under individual or combined excitation of earthquake, wave, and current are discussed to explore the influence of water–structure interaction on the seismic capacity of deep‐water bridges. Finally, the development of testing facilities that can simulate the water–structure interaction is summarized. Particularly, a new multifunctional dual underwater shaking table system built‐in Tianjin University that can simulate multiple‐support excitation and water–structure interaction simultaneously is introduced in detail for the first time.