Seismic response analysis of steel–concrete hybrid wind turbine tower

2021 ◽  
pp. 107754632110075
Author(s):  
Junling Chen ◽  
Jinwei Li ◽  
Dawei Wang ◽  
Youquan Feng
Keyword(s):  
Wind Turbine ◽  
Response Spectrum ◽  
Ground Motions ◽  
Time History ◽  
Seismic Action ◽  
Response Spectrum Method ◽  
Spectrum Method ◽  
Wind Turbine Tower ◽  
Ground Types ◽  
Nonlinear Time History

The steel–concrete hybrid wind turbine tower is characterized by the concrete tubular segment at the lower part and the traditional steel tubular segment at the upper part. Because of the great change of mass and stiffness along the height of the tower at the connection of steel segment and concrete segment, its dynamic responses under seismic ground motions are significantly different from those of the traditional steel tubular wind turbine tower. Two detailed finite element models of a full steel tubular tower and a steel–concrete hybrid tower for 2.0 MW wind turbine built in the same wind farm are, respectively, developed by using the finite element software ABAQUS. The response spectrum method is applied to analyze the seismic action effects of these two towers under three different ground types. Three groups of ground motions corresponding to three ground types are used to analyze the dynamic response of the steel–concrete hybrid tower by the nonlinear time history method. The numerical results show that the seismic action effect by the response spectrum method is lower than those by the nonlinear time history method. And then it can be concluded that the response spectrum method is not suitable for calculating the seismic action effects of the steel–concrete hybrid tower directly and the time history analyses should be a necessary supplement for its seismic design. The first three modes have obvious contributions on the dynamic response of the steel–concrete hybrid tower.

scholarly journals Floor response spectrum method of multiply supported piping system assisted by time history analysis

2020 ◽  
Vol 86 (888) ◽  
pp. 20-00129-20-00129
Author(s):  
Yoshihiro TAKAYAMA ◽  
Ayaka YOSHIDA ◽  
Nobuyoshi IRIKI ◽  
Eiichi MAEDA
Keyword(s):  
Response Spectrum ◽  
Time History ◽  
Time History Analysis ◽  
Piping System ◽  
Response Spectrum Method ◽  
Spectrum Method ◽  
History Analysis

Insights Gleaned From NRC-BNL Benchmark Evaluation of Seismic Analysis Methods for Non-Classically Damped Coupled Systems

2004 ◽  
Vol 126 (1) ◽  
pp. 75-84 ◽  
Author(s):  
J. Xu ◽  
G. DeGrassi ◽  
N. Chokshi
Keyword(s):  
Normal Mode ◽  
Seismic Analysis ◽  
Response Spectrum ◽  
Time History ◽  
Computer Programs ◽  
Coupled Systems ◽  
Response Spectrum Method ◽  
Complex Mode ◽  
Spectrum Method ◽  
Mode Response

Under the auspices of the US Nuclear Regulatory Commission (NRC), Brookhaven National Laboratory (BNL) developed a comprehensive program to evaluate state-of-the-art methods and computer programs for seismic analysis of typical coupled nuclear power plant (NPP) systems with non-classical damping. In this program, four benchmark models of coupled building-piping/equipment systems with different damping characteristics were developed and analyzed by BNL for a suite of earthquakes. The BNL analysis was carried out by the Wilson-θ time domain integration method with the system-damping matrix computed using a synthesis formulation as presented in a companion paper [Xu, J., 2003, Nuclear Eng. Des. These benchmark problems were subsequently distributed to and analyzed by program participants applying their uniquely developed methods and computer programs. This paper presents the insights gleaned from the participants’ analyses, and the comparison of their results to the BNL time history solutions. The participant’s results established using complex modal time history methods showed close agreement with the BNL solutions, while the analyses produced with either complex-mode response spectrum methods or classical normal-mode response spectrum method, in general, produced relatively conservative results, when averaged over a suite of earthquakes. However, when coupling due to damping is significant, complex-mode response spectrum methods performed better than the classical normal-mode response spectrum method. Furthermore, as part of the program objectives, a parametric assessment is performed aiming at evaluating the applicability and sensitivity of various analysis methods to problems with different dynamic characteristics unique to coupled NPP systems. It is believed that the findings and insights learned from this program are useful in developing new acceptance criteria and providing guidance for future regulatory activities involving licensing applications of these alternate methods to coupled systems.

Floor Response Spectrum Method of Multiply Supported Piping System Assisted by Time History Analysis

2020 ◽  
Author(s):  
Yoshihiro Takayama ◽  
Ayaka Yoshida ◽  
Iriki Nobuyoshi ◽  
Eiichi Maeda
Keyword(s):  
Seismic Analysis ◽  
Response Spectrum ◽  
Time History ◽  
Correlation Coefficients ◽  
Time History Analysis ◽  
Piping System ◽  
Response Spectrum Method ◽  
Sum Rule ◽  
Spectrum Method ◽  
History Analysis

Abstract The independent support motion response spectrum method (ISM) is currently used for seismic analysis to calculate the response of multiply supported piping with independent inputs of support excitations. This approach may derive considerable overestimation in the combination of group responses under the absolute sum rule of NUREG-1061 [1]. Then authors have developed an advanced method of the ISM approach named SATH (Spectrum Method Assisted by Time History Analysis). In the SATH method, both of floor response spectra and time histories of floor acceleration are used as independent inputs of support excitations. The group responses are summed with correlation coefficients which are calculated by considering each time history of modal response by independent inputs of support excitations. In this paper, the necessity of taking the effects of correlation coefficients for the group responses into account in the ISM approach is examined. The SATH method has advantage to derive a more realistic sum rule of the group responses and applicability for the actual design.

Vertical seismic response analysis of long-span composite open-web grid floor

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Qizhu Yang ◽  
Kejian Ma ◽  
Huagang Zhang ◽  
Yanhui Wei ◽  
Ze Xiang
Keyword(s):  
Seismic Performance ◽  
Response Spectrum ◽  
Time History ◽  
Grid Floor ◽  
Time History Analysis ◽  
Analysis Method ◽  
Response Spectrum Method ◽  
Content Type ◽  
Spectrum Method ◽  
History Analysis

PurposeThe purpose of this paper is to study the dynamic characteristics and seismic performance of the composite open-web grid floor structure.Design/methodology/approachStudied by using mode-superposition response spectrum method and time history analysis method.FindingsThe results show that the vertical mode-superposition response spectrum method is close to the time history analysis method. The floor has strong seismic performance, and the deflection and internal force are not large under vertical seism. The vertical seismic action suggested that 10% of the representative value of gravity load should be used to ensure the safety of the structure.Originality/valueIn the design, the mid-span section should be properly strengthened or the variable section design should be adopted.

scholarly journals Seismic Performance Analysis of Continuous Rigid Frame Bridges in Expressway under Non-linear Interactions of Soil-Piles

2018 ◽  
Vol 175 ◽  
pp. 04037
Author(s):  
FENG Yongbing
Keyword(s):  
Response Spectrum ◽  
Time History ◽  
Time History Analysis ◽  
Structural Safety ◽  
Response Spectrum Method ◽  
Spectrum Method ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
History Analysis ◽  
Rigid Frame Bridge

Taking the three-span pre-stressed concrete continuous rigid frame bridge as an engineering example, MIDAS Civil was utilized to establish a spatial finite element model and the interaction between pile foundation and the soil was simulated by equivalent soil spring. In addition to analyzing shearing force, bending moment and stress of the primary beam's characteristic section under different loads, a response spectrum method and time history analysis were adopted to conduct seismic response analysis respectively. In this case, performance of the bridge could be comprehensively evaluated. Relevant analysis results indicate that internal force of the large-span pre-stressed concrete continuous rigid frame bridge is mainly induced by gravity and pre-stress of the structure; section stresses of the primary beam satisfy the corresponding specification and structural safety can be achieved in a state of operation. Moreover, computed results obtained by the response spectrum method is more conservative than those of the time history analysis. In terms of continuous rigid frame bridge, different seismic directions should be taken into consideration during structural seismic analysis at different construction stages.

scholarly journals Comparative Study on the Analysis Methods for the Seismic Resistance of Bridge Structure

2019 ◽  
Vol 267 ◽  
pp. 04014
Author(s):  
Danling Wang
Keyword(s):  
Comparative Study ◽  
Response Spectrum ◽  
Time History ◽  
Time History Analysis ◽  
Seismic Resistance ◽  
Bridge Structure ◽  
Response Spectrum Method ◽  
Spectrum Method ◽  
Analysis Methods ◽  
History Analysis

As a kind of destructive natural disasters, earthquake can cause serious damage to the bridges of lifeline projects, which will bring great difficulties to the rescue and relief work. The bridge structure is complex, and people pay increasingly more attention to the research on its seismic resistance. It is very important for designers and researchers to adopt an appropriate analysis method in seismic resistance analysis. This paper briefly summarizes the hazards caused by earthquakes to long-span bridges, and introduces the calculation principles of response spectrum method and time history analysis in detail. Through the comparative study of the two commonly used seismic resistance analysis methods for bridges, it summarizes the advantages and disadvantages and the application scope of each method, providing reference for selecting suitable design methods for seismic resistance design. Lastly, it describes the future research trends of response spectrum method and time history analysis.

Dynamic Analyses of a Self-Anchored Suspension Bridge under Seismic Excitations

2014 ◽  
Vol 580-583 ◽  
pp. 1687-1691
Author(s):  
Cheng Wang ◽  
Yan Xu Wang
Keyword(s):  
Seismic Response ◽  
Response Spectrum ◽  
Time History ◽  
Suspension Bridge ◽  
Main Beam ◽  
Response Spectrum Method ◽  
Seismic Excitations ◽  
Spectrum Method ◽  
History Analysis ◽  
Standard Response

The seismic response of the Wusong bridge was analyzed though the response spectrum method and the time-history method by adopting the MIDAS/CIVIL. The analysis results show that the longitudinal displacement of the main girder is much larger under longitudinal seismic input, so some inhibiting device or dampers should be used to avoid impacting. There is not coupling between longitudinal and lateral seismic excitations, while the seismic response of moment and shear force at the bottom of the main tower is much larger. On the contrary the seismic response of main beam and the main cable should be calculated under the longitudinal and vertical seismic excitations because of the coupling between the both of them. Furthermore, the artificial seismic wave fitting standard response spectrum was generated to conduct the time-history analysis and the results are much larger than the results from the response spectrum method.

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