Substructure design optimization and nonlinear responses control analysis of the mega-sub controlled structural system (MSCSS) under earthquake action

2021 ◽  
Vol 20 (3) ◽  
pp. 687-704
Author(s):  
Mustapha Abdulhadi ◽  
Zhang Xun’an ◽  
Buqiao Fan ◽  
Muhammad Moman
Keyword(s):  
Design Optimization ◽  
Control Analysis ◽  
Structural System ◽  
Nonlinear Responses ◽  
Earthquake Action

Design, Optimization and Nonlinear Response Control Analysis of the Mega Sub-Controlled Structural System (MSCSS) Under Earthquake Action

2020 ◽  
Vol 14 (03) ◽  
pp. 2050013
Author(s):  
Mustapha Abdulhadi ◽  
Zhang Xun’an ◽  
Buqiao Fan ◽  
Muhammad Moman
Keyword(s):  
Structural Response ◽  
Frame Structure ◽  
Control Analysis ◽  
Percentage Reduction ◽  
Optimal Arrangement ◽  
Control Effectiveness ◽  
Rubber Bearing ◽  
Earthquake Action ◽  
Controlled Structure ◽  
Rubber Bearings

The lately proposed mega sub-controlled structure (MSCSS) remarkably improved the seismic resistance ability and reduced vibration effects much more than the mega substructure (MSS). However, the controlling effectiveness and its optimization remain a significant concern. In this paper, a new configuration of MSCSS is analyzed in which viscous dampers are optimally arranged between mega-frame and substructural frame and optimal damper parameters are investigated. Also, rubber bearings are designed and introduced at the top of the additional column to ease the horizontal constraints between the additional column and mega-floor beam and improve the structural design of MSCSS, so that the structure has a larger span and further reduces the structural response. The result showed that optimal parameters of the damper and its optimal arrangement have a significant influence in the control effectiveness of MSCSS. Furthermore, the addition of a rubber bearing at the top of the additional column improves the mechanical behavior of the column and further reduces the acceleration response of both the mega-frame structure and the substructure. This paper also shows that the percentage reduction of the acceleration is more within the substructure than at the mega-frame structure. The seismic response of this structure under El Centro is less than the Taft (NE) wave and the percentage reduction is more under the Taft wave than under the El Centro wave.

The Influence of the Characteristics of the Structural System on the Results of the Calculation of High-Rise Building on Seismic Action

2018 ◽  
Vol 931 ◽  
pp. 196-199
Author(s):  
Vladimir N. Aksenov ◽  
Nikolay B. Aksenov ◽  
Muhammad V. Aushev
Keyword(s):  
Seismic Activity ◽  
Simulation Experiment ◽  
Seismic Action ◽  
Stiffness Ratio ◽  
Structural System ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
High Rise ◽  
Earthquake Action ◽  
Modal Mass

This paper presents the results of the simulation experiment performed in Lira-SAPR. The purpose of the experiment is modal analysis of various structural schemes of the high-rise reinforced concrete frame under pulsation and earthquake action. Calculations have been made for three series of samples, differing in the stiffness ratio of the frame and diaphragm of the scheme (from 20% to 65.9%), considering seismic rating of 7, 8 and 9 magnitude and subsoils of the 1st, 2nd and 3rd categories of seismic activity. It has been established, that the ratio of stiffness influences the distribution of the modal mass. The acceleration of the cover nodes does not depend on the stiffness ratio – they grow as seismic activity of the site increases. Stiffness ratio influences the total reinforcement requirement. This influence is significant in the range of ratio values from 20.5% to 42.5%. Further increase in the stiffness ratio has little influence on the reinforcement requirement.

Design Optimization and Control Analysis of Mechanical Arm Equipped on Wheelchair

2014 ◽  
Vol 983 ◽  
pp. 363-367
Author(s):  
Gui Bin Luo ◽  
Can Can Zeng ◽  
Li Da Zhu
Keyword(s):  
Design Optimization ◽  
Motion Control ◽  
Linear Interpolation ◽  
Assistive Devices ◽  
Control Analysis ◽  
Kinematics Analysis ◽  
Key Points ◽  
Optimization And Control ◽  
Strength And Stiffness ◽  
And Control

Aiming at the phenomenon that our country has a large number of disabled due to illness or accident while the corresponding assistive devices is extremely deficient, we have designed a kind of mechanical arm which is intended to be equipped on wheelchair. We adopt articulated mechanical arm with multi-DOF as its mechanical structure, and choose MCU as the main controller; therefore it can make all kinds of flexible action to achieve a variety of functions. In order to improve the accuracy of manipulator, based on experimental results, we optimize the mechanical arm’s structure, improving its strength and stiffness; in order to realize the motion control of the manipulator, the kinematics analysis is conducted, when solving the mechanical arm’s anthropomorphic action problem, we set key points and then optimize the trajectory with linear interpolation, at last achieve anthropomorphic movement.

scholarly journals Assessment of structural nonlinearities employing extremes of dynamic responses

2016 ◽  
Vol 24 (1) ◽  
pp. 137-152 ◽  
Author(s):  
Vikram Pakrashi ◽  
Paul Fitzgerald ◽  
Michael O’Leary ◽  
Vesna Jaksic ◽  
Kevin Ryan ◽  
...  
Keyword(s):  
Experimental Studies ◽  
Theoretical Models ◽  
Parameter Tuning ◽  
Dynamic Responses ◽  
Structural Systems ◽  
Structural System ◽  
Single Degree Of Freedom ◽  
Nonlinear Responses ◽  
Structural Nonlinearities ◽  
Measurement Devices

A range of methodologies exist for estimating nonlinear responses of structural systems using numerical simulations. However, efforts in relation to experimental methods in this regard still warrant further investigation. This paper presents an approach for assessing structural nonlinearities using the extremes of dynamic responses of the structural system under consideration. The approach allows revisiting and parameter tuning of theoretical models of structures based on experimental studies. A single degree of freedom system was excited in this study using broadband input excitations and the output dynamic responses were measured using different devices. The type and extent of experimentation required for implementation of the presented technique was investigated along with the effects of the estimates of the measured variables and the effects related to different measurement devices.

Reliability Assessment and Reliability-Based Design Optimization of Large Scale Box-Girder Structural System

2014 ◽  
Vol 1065-1069 ◽  
pp. 1087-1091
Author(s):  
Chang Li Yu ◽  
Joo Sung Lee
Keyword(s):  
Design Optimization ◽  
Large Scale ◽  
Optimization Problem ◽  
Reliability Assessment ◽  
Safety Margin ◽  
Structural System ◽  
Reliability Based Design Optimization ◽  
Box Girder ◽  
Reliability Based Design ◽  
Structural Resistance

Reliability analysis and reliability-based design optimization of large scale box-girder structural system is an interesting topic in the field of structural design. Structural resistance, loading, plating thickness and cross-sectional area of beam are considered as stochastic variables. Safety margin equations of both beam and plate element are constructed. Since the safety margin equations are implicit function of random variables, the stochastic finite element method (SFEM) is adequate for sensitivity analysis. The advanced first order second moment (AFOSM) method is used to calculate the safety indices of structural components. In addition to this, branch and bound method is used to identify the dominant failure paths. Probabilistic Network Evaluation Technique (PNET) method is used to assess failure probability of structural system. The optimization problem of structure is formulated as a nonlinear programming problem that aims at minimizing structural weight with constraints on reliability and range constraints of design variables. An optimum vector algorithm is applied to solve the optimization problem. One illustrative example is carried out to elucidate present process of reliability assessment and reliability-based design optimization.

scholarly journals Comparison of nonlinear solution techniques named arc-length for the geometrically nonlinear analysis of structural systems

2021 ◽  
Vol 9 (3B) ◽  
Author(s):  
TALASLIOĞLU Tuğrul ◽  
Keyword(s):  
Nonlinear Analysis ◽  
Geometric Nonlinearity ◽  
Nonlinear Behavior ◽  
Structural Systems ◽  
Geometrically Nonlinear ◽  
Arc Length ◽  
Structural System ◽  
Geometrically Nonlinear Analysis ◽  
Benchmark Tests ◽  
Nonlinear Responses

The nonlinearity issue is one of the promising fields in the engineering area. Particularly, the geometric nonlinearity bears big importance for the structural systems showing a tendency of larger deflection. In order to obtain a correct load-deflection relation for the structural system subjected to any external load, an advanced incremental-iterative based approach has to be utilized in the analysis of nonlinear responses. Arc length method has been proven to be the most perfect one among the nonlinear analysis approaches. Thus, it is extensively applied to the structural systems with pin-connected joints. This study attempts to compare two variations of arc length method named “spherical” and “linearized” for the nonlinear analysis of structural system with rigid-connected joints. Also, two different element formulations are utilized to discretize the structural systems. Two open-source coded programs, Opensees and FEAP, are employed for six benchmark structural systems in order to compare the performance of employed arc-length techniques. Furthermore, in order to make a further observation in the nonlinear behavior of application examples, their simulations are not only sketched using graphs, but also displayed through the movies for each of benchmark tests. Consequently, the linearized type arc length technique implemented in FEAP shows a more success with a better prediction of load-deflection relation, noting that Opensees has a big advantage of having an element, which is capable of simulating the geometric nonlinearity.

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