scholarly journals Seismic performance of MR steel frames via Incremental Dynamic Analysis

ce/papers ◽  
2021 ◽  
Vol 4 (2-4) ◽  
pp. 1924-1931
Author(s):  
Claudio Bernuzzi ◽  
Davide Rodigari ◽  
Marco Simoncelli
Keyword(s):  
Dynamic Analysis ◽  
Seismic Performance ◽  
Steel Frames ◽  
Incremental Dynamic Analysis

Incremental Dynamic Analysis of Shape Memory Alloy Braced Steel Frames

2014 ◽  
Vol 680 ◽  
pp. 263-266
Author(s):  
Saber Moradi ◽  
M. Shahria Alam
Keyword(s):  
Shape Memory Alloy ◽  
Dynamic Analysis ◽  
Shape Memory ◽  
Seismic Performance ◽  
Steel Frames ◽  
Incremental Dynamic Analysis ◽  
Braced Frames ◽  
Earthquake Excitation ◽  
Uniform Drift ◽  
Buckling Restrained Braced Frames

Incremental Dynamic Analysis (IDA) is a technique to determine the overall seismic performance of structures under varied intensities of earthquakes. In this paper, the seismic performance of four-story steel braced frames equipped with superelastic Shape Memory Alloy (SMA) braces is assessed by performing IDA. The seismic response of SMA-braced frames was compared to that of corresponding Buckling-Restrained Braced Frames (BRBFs). Based on the results of this comparative study, the SMA-braced frames were generally effective in reducing maximum interstory drifts and permanent roof deformations. In addition, the SMA-braced frames demonstrated more uniform drift distribution over the height of the building. As the intensity of earthquake excitation increases, a higher response reduction can be expected for SMA-braced frames.

scholarly journals Seismic vulnerability assessment of a high-rise molten-salt solar tower based on incremental dynamic analysis

2020 ◽  
Vol 194 ◽  
pp. 01005
Author(s):  
Weiwei Sun ◽  
Dina D’Ayala ◽  
Jinxing Fu ◽  
Wentao Gu ◽  
Jun Feng
Keyword(s):  
Dynamic Analysis ◽  
Molten Salt ◽  
Seismic Performance ◽  
Vulnerability Assessment ◽  
Seismic Vulnerability ◽  
Incremental Dynamic Analysis ◽  
Seismic Excitations ◽  
Ground Acceleration ◽  
Seismic Vulnerability Assessment ◽  
High Rise

This paper investigates the seismic performance of a high-rise molten-salt solar tower by finite element modelling. The integrated and separated models for solar tower based on the concrete damage plastic model are validated by matching the behaviour of similar reinforced concrete chimney specimens. The modal analysis demonstrates the first four modes of the solar tower are translational vibration. Seismic simulations are developed through the incremental dynamic analysis. The most disadvantageous position of the tower is all concentrated in the opening section under multidirectional seismic excitations. The top displacement of the tower under bidirectional and three-directional earthquake actions is larger than that under unidirectional earthquake actions. The results of the seismic vulnerability assessment show that when the PGA equals to 0.035g, the tower will be intact; when the PGA equals to 0.1g (design peak ground acceleration), the probability of the moderate damage state is within 1.5%; when the PGA equals to 0.22g (maximum considered earthquake), the probability of the destruction state is below 0.7%. The seismic partitioned fragility analysis of the tower under multidirectional earthquake excitations illustrates that there are two peaks in the vulnerability surfaces. The anti-collapse analysis indicates the tower has a good seismic performance under multidirectional seismic excitations.

scholarly journals Incremental Dynamic Analysis for Estimating Seismic Performance of Multi-Story Buildings with Butterfly-Shaped Structural Dampers

Buildings ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 78 ◽  
Author(s):  
Alireza Farzampour ◽  
Iman Mansouri ◽  
Hamzeh Dehghani
Keyword(s):  
Dynamic Analysis ◽  
Seismic Performance ◽  
Structural Integrity ◽  
Specific Area ◽  
Load Resistance ◽  
Incremental Dynamic Analysis ◽  
Seismic Loads ◽  
Limit States ◽  
Braced Frame ◽  
Collapse Behavior

Structural strength and stiffness were previously investigated to sufficiently improve the lateral load resistance against major events. Many buildings require appropriate design to effectively withstand the lateral seismic loads and reduce the corresponding damages. Design methodologies and structural elements were recently introduced to improve the energy dissipation capability and limit the high force demands under seismic loadings. The new systems are designed to protect the structural integrity and concentrate the inelasticity in a specific area, while the remaining parts are kept undamaged and intact. This study introduces a new structural system with dampers having strategic cutouts, leaving butterfly-shaped shear dampers for dominating the yielding mechanism over other brittle limit states. The new system is designed for re-establishing the conventional eccentrically braced frame system with simple linking beams. The system with strategic cutouts is subsequently used and compared with the eccentrically braced frames (EBF) system for seismic performance investigation and incremental dynamic analysis (IDA), using the OpenSees program, which is used to indicate the collapse behavior under forty-four selected ground motions. Results show that the butterfly-shaped multi-story buildings, compared to the corresponding conventional systems, are capable of enhancing the system resistance against lateral seismic loads by postponing the collapse state to the larger drift ratio values.

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