Post-earthquake Emergency Response and Recovery Through City-Scale Nonlinear Time-History Analysis

2021 ◽  
pp. 797-876
Author(s):  
Xinzheng Lu ◽  
Hong Guan
Keyword(s):  
Emergency Response ◽  
Time History ◽  
Time History Analysis ◽  
Nonlinear Time History Analysis ◽  
History Analysis ◽  
Response And Recovery ◽  
Earthquake Emergency Response ◽  
Nonlinear Time History

Direct Displacement Procedure for Performance-Based Seismic Design of Mid-Rise Wood-Framed Structures

2009 ◽  
Vol 25 (3) ◽  
pp. 583-605 ◽  
Author(s):  
Wei Chiang Pang ◽  
David V. Rosowsky
Keyword(s):  
Seismic Design ◽  
Response Spectrum ◽  
Design Procedure ◽  
Time History ◽  
Time History Analysis ◽  
Nonlinear Time History Analysis ◽  
Framed Structures ◽  
History Analysis ◽  
Performance Based Seismic Design ◽  
Nonlinear Time History

This paper presents a direct displacement design (DDD) procedure that can be used for seismic design of multistory wood-framed structures. The proposed procedure is applicable to any pure shear deforming system. The design procedure is a promising design tool for performance-based seismic design since it allows consideration of multiple performance objectives (e.g., damage limitation, safety requirements) without requiring the engineer to perform a complex finite element or nonlinear time-history analysis of the complete structure. A simple procedure based on normalized modal analysis is used to convert the code-specified acceleration response spectrum into a set of interstory drift spectra. These spectra can be used to determine the minimum stiffness required for each floor based on the drift limit requirements. Specific shear walls can then be directly selected from a database of backbone curves. The procedure is illustrated on the design of two three-story ATC-63 archetype buildings, and the results are validated using nonlinear time-history analysis.

An open-source framework for regional earthquake loss estimation using the city-scale nonlinear time history analysis

2020 ◽  
Vol 36 (2) ◽  
pp. 806-831 ◽  
Author(s):  
Xinzheng Lu ◽  
Frank McKenna ◽  
Qingle Cheng ◽  
Zhen Xu ◽  
Xiang Zeng ◽  
...  
Keyword(s):  
Open Source ◽  
Time History ◽  
Seismic Damage ◽  
Scientific Workflow ◽  
Time History Analysis ◽  
Nonlinear Time History Analysis ◽  
History Analysis ◽  
Loss Prediction ◽  
Nonlinear Time History ◽  
Damage Simulation

Regional seismic damage simulation of buildings provides decision-makers with important information for earthquake disaster prevention and mitigation. Utilizing nonlinear time history analysis using multiple-degree-of-freedom (MDOF) models for buildings, and the next-generation performance-based earthquake engineering, an open-source general-purpose scientific workflow for seismic damage simulation and loss prediction of urban buildings (referred to as SimCenter Workflow) is presented in this study. To introduce the SimCenter Workflow process in detail and demonstrate its advantages, a seismic damage simulation and loss prediction for 1.8 million buildings in the San Francisco Bay Area were performed using the SimCenter Workflow. The open nature and modularization of the SimCenter Workflow facilitate its extensibility and make it practical for researchers to apply to seismic damage simulations in other regions.

Research on the Seismic Response Characteristic of a Curved Ramp Bridge

2011 ◽  
Vol 243-249 ◽  
pp. 3889-3892 ◽  
Author(s):  
Tian Li Wang ◽  
Qing Ning Li ◽  
Hai Jun Yin
Keyword(s):  
Seismic Response ◽  
Time History ◽  
Response Characteristic ◽  
Time History Analysis ◽  
Nonlinear Time History Analysis ◽  
Expansion Joints ◽  
History Analysis ◽  
Nonlinear Time History

In order to analyze seismic response of the curved ramp bridge, this paper selected a single curved ramp bridge in a multilevel junction system as its research object. Considering the piers, beams, bearings and expansion joints simulation, it respectively built the calculating models for a curved ramp bridge and a corresponding linear one. Using nonlinear time history analysis, the paper contrasts seismic response of the curved ramp bridge with that of the linear one in several different seismic inputs. Finally the seismic response characteristic of a curved ramp bridge is put forward.

THE BRIDGES WITH UNSEATING PREVENTION DEVICES ANALYZED THROUGH NONLINEAR TIME HISTORY ANALYSIS AND HILBERT–HUANG TRANSFORM

2010 ◽  
Vol 02 (01) ◽  
pp. 115-134
Author(s):  
YEOU-FONG LI ◽  
TSENG-HSING HSU ◽  
K. H. LEN
Keyword(s):  
Time History ◽  
Time History Analysis ◽  
Nonlinear Time History Analysis ◽  
Hilbert Huang Transform ◽  
Time Frequency ◽  
Rubber Bearing ◽  
History Analysis ◽  
Time History Response ◽  
Nonlinear Time History ◽  
Seismic Forces

In this paper, the mechanical behaviors of bridges with unseating prevention devices in the superstructure were investigated. These devices can prevent bridge from unseating and divert most of the seismic forces from transferring to the bridge columns. The models of the rubber bearing, restrainer, and shear key were proposed and implemented into the SAP 2000 to obtain the seismic response of the bridge. The nonlinear time history analysis was used to determine the time history response of the superstructure of the bridge. In the meantime, the Hilbert–Huang Transform (HHT) was used to transfer the displacement–time responses of the superstructure of the bridge into the time–frequency domain, while the spectra are a function of both frequency and time. The spectra of the HHT can be used to determine the operation sequences of the unseating prevention devices.

scholarly journals Analisis Kinerja Bangunan Rangka Baja dengan Bresing Tahan Tekuk terhadap Beban Gempa

2021 ◽  
Vol 6 (2) ◽  
pp. 98
Author(s):  
Ilham Ilham
Keyword(s):  
Pushover Analysis ◽  
Time History ◽  
Steel Structures ◽  
Time History Analysis ◽  
Nonlinear Time History Analysis ◽  
Structural Performance ◽  
History Analysis ◽  
Immediate Occupancy ◽  
Nonlinear Time History ◽  
Modal Pushover

ABSTRAKPenggunaan bresing tahan tekuk dapat menjadi solusi atas kebutuhan struktur tahan gempa di Indonesia. Disipasi energi pada elemen bresing tahan tekuk dilakukan melalui kinerja plastifikasi bagian inti bresing akibat beban tarik dan tekan. Penelitian ini berisi kajian kinerja dari bangunan rangka baja beraturan dengan bresing tahan tekuk (BRB) dengan variasi level ketinggian lantai yaitu 3 lantai, 8 lantai dan 15 lantai. Analisis struktur 3D dilakukan dengan dua prosedur analisis yaitu modal pushover dan nonlinear time history pada program ETABS. Hasil analisis menunjukkan bahwa pemilihan elemen BRB sangat mempengaruhi kinerja struktur, yang terlihat dari pola drift yang terjadi. Untuk struktur beraturan dengan berbagai ketinggian, tingkat kinerja struktur dengan BRB cukup baik, yaitu Immediate Occupancy (IO) akibat beban gempa rencana. Plastifikasi hanya terjadi pada BRB, dan kelelehan pada balok mulai terbentuk sampai mekanisme keruntuhan terjadi. Hasil modal pushover dengan nonlinear time history pada bangunan 15 lantai yang cukup mirip menunjukkan bahwa modal pushover dapat digunakan untuk memprediksi kinerja struktur BRB yang beraturan.Kata kunci: kinerja struktur, bresing tahan tekuk, immediate occupancy, modal pushover, nonlinear time history ABSTRACTBuckling restrained braces (BRB) can be an alternative solution for earthquake resistant steel structure in Indonesia. The energy dissipation for buckling restrained elements is conducted through yielding of the core due to tension or compression forces. This study presents an evaluation of the structural performance of steel structures with BRB varying in heights, 3-story, 8-story and 15-story. The 3D structural analysis was carried out with ETABS software using 2 methods, Modal Pushover and Nonlinear Time History. The results shows that the selection of BRB elements greatly affected the structural performance, showed by the drift pattern. For regular structures with variation in heights, structures with BRB behaved satisfactory under the design load with the performance level of Immediate Occupancy (IO). Yielding was limited to BRB members, and afterwards the yielding occurred on beams until collapse. The results of modal pushover and time history analysis for 15-story structure are similar, thus modal pushover can be used to predict the performance of regular structural system with BRB.Keywords: structural performance, buckling restrained brace, immediate occupancy, modal pushover analysis, nonlinear time history analysis

Damage Assessment of Inelastic Structures under Simulated Critical Earthquakes

2012 ◽  
pp. 128-151
Author(s):  
Abbas Moustafa
Keyword(s):  
Damage Assessment ◽  
Time History ◽  
Life Time ◽  
Soil Condition ◽  
Time History Analysis ◽  
Nonlinear Time History Analysis ◽  
Inelastic Structures ◽  
History Analysis ◽  
Fault Properties ◽  
Nonlinear Time History

Damage of structures can be significantly reduced through robust prediction of possible future earthquakes that can occur during the life-time of the structure and through accurate modeling of the nonlinear behavior of the structure under seismic loads. Modern seismic codes specify natural records and artificially generated ground accelerations as input to the nonlinear time-history analysis of the structure. The advantage of using natural records is the inclusion of all important characteristics of the ground motion (fault properties, path effects and local soil condition) in the design input. This option requires selecting and scaling a set of proper accelerograms from the available records. However, the site under consideration may have limited or scarce earthquake data. In such case, numerically simulated ground motions can be employed as input to the dynamic analysis of the structure. This chapter deals with the damage assessment of inelastic structures under numerically simulated critical earthquakes using nonlinear optimization, inelastic time-history analysis, and damage indices.

Structural Integrity Evaluation of Spent Fuel Storage Racks and Support Frame for a Research Reactor

2012 ◽  
Author(s):  
Jinho Oh ◽  
Jeong-Soo Ryu ◽  
Young-Ki Kim
Keyword(s):  
Structural Integrity ◽  
Time History ◽  
Time History Analysis ◽  
Nonlinear Time History Analysis ◽  
Seismic Loads ◽  
Spent Fuel ◽  
Support Frame ◽  
History Analysis ◽  
Fuel Storage ◽  
Nonlinear Time History

The objective of this study is to design the spent fuel storage rack (SFSR) and their support frame as well as to evaluate the structural integrity of those during and after the seismic events. The main function of these racks is to store and protect the irradiated fuel assemblies generated during the operation of the research reactor. Their support frame is used for maintaining the structural stability of these racks. The SFSRs and their support frame are classified into safety class NNS and seismic category I according with ANSI 51.1 [1] and Regulatory Guide 1.29 [2]. The design of those has been performed according to the guideline of Regulatory Guide 1.13 [3] and IAEA safety standards DS 350 [4]. Specially, the pitch among storage cells should be decided from the criticality calculation with all postulated assumptions according to the NUREG 1537 [5] (Effective Neutron Multiplication Factor, keff < 0.9), conservatively. These racks are installed in their support frame having free standing type boundary conditions in the pool. Since the dynamic behavior of structures can be significantly affected by the water, the hydrodynamic effect is considered by using added mass. All materials of submerged racks and their support frame are made of austenitic stainless steel to prevent the corrosion. To evaluate the structural integrity of these racks and their support frame, the response spectrum analysis (RSA) and response time history analysis have been performed under the seismic loads of OBE (Operating Basis Earthquake) and SSE (Safe Shutdown Earthquake) by using ANSYS software. In addition, the possibility of impact between the side wall of the pool and the support frame is investigated by using a nonlinear time history analysis considering the structural nonlinearity such as the contact and the friction problem. The analysis results show that the maximum stress values of these racks and their support frame under the seismic loads are within the specified code limits. Since the sliding distance calculated from the nonlinear time history analysis is less than the gap, the impact does not occur. It is confirmed that those cannot be overturned but slide under an SSE event. Therefore, any damage on the structural integrity is not expected when those are installed and utilized in the pool.

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