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.

Seismic Performance Evaluation of SRC Frames Based on Incremental Dynamic Analysis

2010 ◽  
Vol 163-167 ◽  
pp. 4331-4335 ◽  
Author(s):  
Qiu Wei Wang ◽  
Qing Xuan Shi ◽  
Jin Jie Men
Keyword(s):  
Reinforced Concrete ◽  
Dynamic Analysis ◽  
Seismic Performance ◽  
Incremental Dynamic Analysis ◽  
Frame Structure ◽  
Reinforced Concrete Frame ◽  
Limit States ◽  
Performance Levels ◽  
Steel Reinforced Concrete ◽  
Forward Limit

Incremental dynamic analysis (IDA) is an effective method for evaluation of seismic performance of building structures. Based on the principle and characteristics of IDA method, evaluation steps of investigating deformation and ductility of steel reinforced concrete (SRC) structures under increasing earthquake loading are put forward. Limit states of different performance levels for structures are connected with IDA curve slope whose decrease amplitude is determined according to current test data. Based on the proposed constitutive model of steel and concrete, a regular steel reinforced concrete frame structure is analyzed with IDA method, and distribution of story drift angle and ductility for four performance levels are investigated. The calculation results show that the SRC frame has better seismic performance when subjected to random earthquake waves.

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.

Seismic collapse assessment of double-layer barrel vault roofs with double-layer vertical walls

2019 ◽  
Vol 22 (13) ◽  
pp. 2837-2852
Author(s):  
Mohammad Kheirollahi ◽  
Karim Abedi ◽  
Mohammad Reza Chenaghlou
Keyword(s):  
Dynamic Analysis ◽  
Double Layer ◽  
Incremental Dynamic Analysis ◽  
Structural System ◽  
Buckling Mode ◽  
Compression Members ◽  
Seismic Collapse ◽  
Vertical Walls ◽  
Collapse Behavior ◽  
Mode Failure

Double-layer barrel vault roofs with double-layer vertical walls are frequently used as a structural system for highly important public buildings; therefore, their seismic design needs special considerations. In this article, the seismic collapse behavior of these structures, used as a lateral load-resisting system, is evaluated by carrying out incremental dynamic analysis. For this purpose, different rise-to-span and height-to-span ratios are considered for the roofs and the walls, respectively. The structures are first designed in accordance with Iranian design codes and then they are modeled in OpenSees. The material and geometric nonlinearities are considered in the analyses, including the buckling response of the compression members. At the next stage, the models are subjected to incremental dynamic analysis and their median collapse capacities are extracted. Collapse margin ratios of various structures are finally derived, following FEMA-P695 methodology, and compared against the established acceptable limits. The obtained results show that collapse of the structures occurs mainly due to the buckling-mode failure of the roof. The collapse performance of the structures with large rise-to-span ratio of roofs and large height-to-span ratio of walls is unacceptable.

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
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