scholarly journals Deterministic Wind Load Dynamic Analysis of High Rise Steel Buildings Including P-Delta Effects

2019 ◽  
Vol 26 (1) ◽  
pp. 129-135
Author(s):  
Rafaa M. Abbas ◽  
Ahmed Sada Dheeb
Keyword(s):  
Time History ◽  
Wind Load ◽  
Steel Buildings ◽  
High Rise ◽  
Building Models ◽  
History Analysis ◽  
Nonlinear Time History Analyses ◽  
Steel Building ◽  
Linear And Nonlinear ◽  
Nonlinear Time History

This study concerns with the investigation of the second-order geometric nonlinearity effects of P-Delta analysis on the dynamic response of high rise steel buildings due to deterministic wind load. Linear and nonlinear time history analyses were conducted to analyze different tall steel building models adopted in the study. Five steel building models ranging from 10 to 50 stories were numerically modeled and analyzed using finite element code ETABS (version 16.0.3). Deterministic dynamic wind load per ASCE 7-10 is applied to the buildings as a main lateral load. Comparative study between linear and nonlinear time history analyses reveals that nonlinear time history analysis including P-Delta effects displayed larger values of buildings lateral sway than those of linear time history analysis. Generally, including P-Delta effect in the nonlinear analysis increases the flexibility of the building structure, and thus increases response peak values and that peak values occur at a longer time periods indicating lesser response oscillations. The study recommends that P-Delta effect need to be addressed by any dynamic wind analysis for tall steel buildings with 20 story height or more.

Plastic Analysis on Buckling Restrained Braced Steel Frame

2013 ◽  
Vol 859 ◽  
pp. 157-162
Author(s):  
Xue Zou ◽  
Jun Zhao ◽  
En He Bao ◽  
Yi Hu Chen
Keyword(s):  
Parametric Analysis ◽  
Main Parameter ◽  
Plastic Hinge ◽  
Time History ◽  
Steel Frame ◽  
Buckling Restrained Brace ◽  
Participation Ratio ◽  
Building Models ◽  
Nonlinear Time History Analyses ◽  
Nonlinear Time History

Six pieces of building models were designed for studying the multilayer buckling restrained braced steel frame in this paper. The main parameter in the study included the frame strength and the level Participation ratio β. Second-order nonlinear time history analyses for models are conducted based on plastic hinge theory. The parametric analysis was performed on story displacement and shear. The results revealed that story bending deformation become more remarkable when the frame strength is increasing from 0.3 to 0.5 or the level Participation ratio β from 30% to 90%, and this situation is more obvious on the upper layer. The share of shear by the buckling restrained brace and the largest story shear ratio get larger in these models as the frame strength and the level Participation ratio β increasing.

scholarly journals Investigation of Behaviors of Concrete Shear Wall in High-Rise Steel Buildings

2018 ◽  
Vol 7 (3.2) ◽  
pp. 135
Author(s):  
Hajiyev Mukhlis Ahmad ◽  
Hasan Dabbaghasadollahi Poor
Keyword(s):  
Time History ◽  
Shear Walls ◽  
Steel Structures ◽  
Shear Wall ◽  
Target Point ◽  
Steel Buildings ◽  
High Rise ◽  
Reinforced Steel ◽  
Structural Plan ◽  
Nonlinear Time History

This study focuses on an analytical study on reinforced steel structures with concrete shear wall. The structures studied was analyzed using nonlinear time history method and the effect of installing  concrete shear walls in the structural plan on the target point displacement. By comparing the roofs' displacement diagrams in different structures with different layout of the shear wall in the plan, it is concluded that in order to achieve the proper result in the design of the structures, the shear walls must be located in the middle of the plan in form of core and enclosed with structural columns.  

scholarly journals Comparison of analysis techniques for the seismic evaluation of an 88-storey concrete building

2021 ◽  
Author(s):  
Andrew Shaffu
Keyword(s):  
Linear Time ◽  
Time History ◽  
Seismic Zone ◽  
Seismic Evaluation ◽  
Coupling Beams ◽  
Orthogonal Direction ◽  
History Analysis ◽  
Nonlinear Time History Analyses ◽  
Concrete Building ◽  
Nonlinear Time History

This thesis presents the comparison of results for an 88-storey reinforced concrete building subjected to static and dynamic analyses. Similar to a building designed in a moderate seismic zone, the structure is designed and detailed according to the ACI 318M (2002) Code provisions and the seismic provisions of the UBC (1997). The building is modeled according to structural drawings and element design specifications are used in describing members' deformation characteristics. Resistance to dynamic motion is provided through boxed core-wall assemblies acting as cantilevers walls in one direction and linked with coupling beams at storey levels in the orthogonal direction. The equivalent static, dynamic modal spectrum, linear time-history and nonlinear time-history analyses are employed and a comparison of maximum inter-storey drift response is provided. The results of the analyses show that the linear time-history analysis is the most appropriate method in capturing the behavior of this particular building under dynamic loading.

scholarly journals Optimal Location of Multiple Tuned Mass Dampers in Regular and Irregular Tall Steel Buildings Plan

2020 ◽  
Vol 2020 ◽  
pp. 1-20
Author(s):  
Mohsen Khazaei ◽  
Reza Vahdani ◽  
Ali Kheyroddin
Keyword(s):  
Passive Control ◽  
Time History ◽  
Optimal Location ◽  
Nonlinear Time History Analysis ◽  
Steel Buildings ◽  
Base Shear ◽  
Tuned Mass Dampers ◽  
History Analysis ◽  
Nonlinear Time History ◽  
Multiple Tuned Mass Dampers

Tuned mass dampers are one of the most common devices for the passive control of structures subjected to earthquakes. The structure of these dampers consists of three main parameters: mass, damping, and stiffness. Tuned mass dampers reduce the amplitude of the responses affecting on a mode. In most cases, only a single TMD (tuned mass damper) or a few dampers at several points above the building height are installed on the roof of the building, requiring considerable mass and space in some parts of the structure as overhead. It is also more important to predict the elements that will meet the required mass. In this research, the performance of multiple tuned mass dampers (MTMDs) is investigated in L- and U-shaped regular and irregular tall steel buildings with 10 and 20 floors, under the near- and far-field records. Nonlinear time history analysis is also applied to evaluate the multiple tuned mass dampers effects on the seismic responses of the structures. The SAP2000 API and MATLAB genetic algorithm are used to determine the optimal location of the MTMDs in the roof plans of the buildings. The results show the effects of multiple tuned mass dampers in reducing the seismic response of acceleration, displacement, and base shear up to 50, 40, and 40% in average, respectively. The results of determining the optimum location of MTMDs in the models indicate the importance of the symmetry of the dampers relative to the centre of mass of the building.

scholarly journals Comparison of analysis techniques for the seismic evaluation of an 88-storey concrete building

2021 ◽  
Author(s):  
Andrew Shaffu
Keyword(s):  
Linear Time ◽  
Time History ◽  
Seismic Zone ◽  
Seismic Evaluation ◽  
Coupling Beams ◽  
Orthogonal Direction ◽  
History Analysis ◽  
Nonlinear Time History Analyses ◽  
Concrete Building ◽  
Nonlinear Time History

This thesis presents the comparison of results for an 88-storey reinforced concrete building subjected to static and dynamic analyses. Similar to a building designed in a moderate seismic zone, the structure is designed and detailed according to the ACI 318M (2002) Code provisions and the seismic provisions of the UBC (1997). The building is modeled according to structural drawings and element design specifications are used in describing members' deformation characteristics. Resistance to dynamic motion is provided through boxed core-wall assemblies acting as cantilevers walls in one direction and linked with coupling beams at storey levels in the orthogonal direction. The equivalent static, dynamic modal spectrum, linear time-history and nonlinear time-history analyses are employed and a comparison of maximum inter-storey drift response is provided. The results of the analyses show that the linear time-history analysis is the most appropriate method in capturing the behavior of this particular building under dynamic loading.

Controls on Material and Mesh for Structural Nonlinear Time-History Analysis

2014 ◽  
Vol 580-583 ◽  
pp. 1564-1569 ◽  
Author(s):  
Xiao Ming Chen ◽  
Jin Duan ◽  
Hu Qi ◽  
Yun Gui Li
Keyword(s):  
Time History ◽  
Mesh Size ◽  
Time History Analysis ◽  
Nonlinear Time History Analysis ◽  
High Frequencies ◽  
High Rise ◽  
History Analysis ◽  
Damage Theory ◽  
Nonlinear Time History ◽  
Explicit Dynamic

<strong> </strong>In order to improve the solution of nonlinear time-history analysis for high-rise buildings, the concrete constitutive relation of Chinese code has been modified by using Najar damage theory, and based on the limitation of stable time increment in explicit dynamic analysis, a simplified Rayleigh damping form with tiny stiffness proportional damping is proposed to decrease the damage induced by those high frequencies, at last, the influence of mesh size on stress and damage is also discussed. The numerical results show that these principles are workable for more accurate results.

Rayleigh Damping in Abaqus/Explicit Dynamic Analysis

2014 ◽  
Vol 627 ◽  
pp. 288-294 ◽  
Author(s):  
Xiao Ming Chen ◽  
Jin Duan ◽  
Hu Qi ◽  
Yun Gui Li
Keyword(s):  
Time History ◽  
Nonlinear Time History Analysis ◽  
Damping Factor ◽  
High Frequencies ◽  
High Rise ◽  
Rayleigh Damping ◽  
History Analysis ◽  
Nonlinear Time History ◽  
Explicit Dynamic ◽  
Damping Model

In the nonlinear time-history analysis for high-rise building, different damping models may lead to results with great difference. Limited by the stable time increment, the stiffness proportional damping is usually neglected in Abaqus/Explicit, and only a simplified mass proportional damping is used, which can be derived from the fundamental frequency and the critical damping factor. In this paper, the influence on the results of this method has been researched by numerical examples, the numerical results also show that the stiffness proportional damping cannot be neglected. Based on these comparisons, a more reasonable damping model is presented for improving the results of high frequencies.

scholarly journals Seismic Performance of Damper Installed In High-Rise Steel Building In Bangladesh

2018 ◽  
Vol 9 (1) ◽  
pp. 1-12
Author(s):  
T. Tabassum ◽  
K.S. Ahmed
Keyword(s):  
Linear Time ◽  
Time History ◽  
Time History Analysis ◽  
Friction Damper ◽  
Maximum Displacement ◽  
Maximum Acceleration ◽  
High Rise ◽  
History Analysis ◽  
Steel Building ◽  
Joint Acceleration

This research paper describes the results of analysis of the seismic behavior of a thirty story steel building with and without damper under different earthquake acceleration signals. The proposed procedure placed the various types of damper like friction damper, bilinear damper and exponential damper on the top three floors of the building. The study compares the different performances such as the joint displacement, joint acceleration, the base force of structure with and without damper for a thirty-story steel building using ETAB2015. The study further performs time history analysis for different seismic accelerograms to observe the actual time domain responses of the structure. Linear time-history analysis on this steel building structure indicates that maximum displacement, maximum base force, and maximum acceleration effectively reduce in the presence of damper at top three floors of the building.

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