scholarly journals Analysis of second-order effects of constructions behaviour

2019 ◽  
Author(s):  
Raminta Venslavavičiūtė ◽  
Kęstutis Urbonas
Keyword(s):  
Steel Frame ◽  
Second Order ◽  
Frame Structure ◽  
Frame Structures ◽  
Order Effects ◽  
Rotational Stiffness ◽  
Frame Building ◽  
Steel Frame Structures ◽  
Second Order Effects ◽  
Rigid Joints

This paper presents the importance of the second-order effects in behaviour of steel frame structures. EN 1993-1-1 were distinguished three main methods: taking / without taking into account second order effects depending on the sensitivity of horizontal design effects and tolerance. Using these methods, the susceptibility of steel frame structures to second-order impacts is considered in accordance with EN 1993-1-1. The study was performed taking into account also the rotational stiffness of the joints of the frame structure. In this way, trying to determine the effect of the joint on the rotational rigidity makes the frame structure more sensitive to second order impacts. It is also considered a semi-rigid joints effects the general frame-tailed P-Δ and the second row stress. This establishes the link between the effects of the second-order and the semi-rigid joints in the overall (general) analysis. Frame-building sensitivity makes it possible to compare and measure the importance of such dependencies.

scholarly journals ANALYSIS OF SECOND-ORDER EFFECTS EVALUATION OF STEEL FRAMES BEHAVIOUR

2020 ◽  
Vol 12 (1) ◽  
pp. 8-14
Author(s):  
Raminta Venslavavičiūtė ◽  
Kęstutis Urbonas ◽  
Vaidotas Šapalas
Keyword(s):  
Structural Engineering ◽  
Steel Frame ◽  
Second Order ◽  
Order Effects ◽  
Rotational Stiffness ◽  
Framed Structures ◽  
Calculation Results ◽  
Steel Frame Structures ◽  
Second Order Effects ◽  
Rigid Joints

The evaluation of second-order effects of steel framed structures can provide different analysis results than using linear analysis methods. In various structural engineering literature were distinguished different methods of analysis: taking or without taking into account second-order effects. It depends on the sensitivity to the horizontal actions. The slenderer the structure, the more sensitive it is to horizontal actions. Using nonlinear methods, the sensitivity of steel frame to second-order impact is considered. This paper shows the importance of evaluations of the second-order effects in behaviour of steel frame structures. Performed investigations reveal the influence of the rotational stiffness of the joints to the behaviour of whole framed structure. Calculation results show that decreased flexibility of the semi-rigid joints increase sensitivity of the framed structure to the second-order effects and vice versa. The identified interdependence between the sensitivity to the second-order effects and the flexibility of the semi-rigid joints highlights the importance of evaluation of such dependencies.

A Second-Order Inelastic Analytical Method on Semirigid Connections Steel Frame

2010 ◽  
Vol 163-167 ◽  
pp. 760-765
Author(s):  
Jian Liu ◽  
Xiang Yun Huang ◽  
Ji Ping Hao ◽  
Guan Gen Zhou ◽  
Deng Feng Peng
Keyword(s):  
Axial Force ◽  
Steel Structure ◽  
Steel Frame ◽  
Second Order ◽  
Frame Structures ◽  
Stability Function ◽  
Inelastic Analysis ◽  
Semirigid Connections ◽  
Steel Frame Structures ◽  
Shearing Deformation

A second-order inelastic analysis of semirigid connection steel frame structures is developed. Therein, shearing deformation and axial force simultaneously are considered. A new stability function considered shearing deformation and axial force simultaneously is proposed and the analysis methods for steel structure of semirigid connection based on the structural ultimate bearing capacity are established. The calculatical programe of second-order inelastic analysis semirigid connection steel frame structures is compiled. The numerical examples of steel frames for semirigid connection are analysed using the second-order inelastic analysis in the paper. Load–displacements predicted by the proposed analysis compare well with those given by other approaches. The analysis results show that the proposed method is suitable for adoption in practice.

scholarly journals Optimization of concentrically braced steel frame structures based on SNI 1726:2019, SNI 1727:2020, SNI 1729:2020, and AISC 341-16

2021 ◽  
Vol 907 (1) ◽  
pp. 012010
Author(s):  
J Aloysius ◽  
J A Sumito ◽  
D Prayogo ◽  
H Santoso
Keyword(s):  
Steel Frame ◽  
Frame Structure ◽  
Frame Structures ◽  
Symbiotic Organisms Search ◽  
Safety Requirements ◽  
Concentrically Braced ◽  
Steel Frame Structures ◽  
Concentrically Braced Steel Frame ◽  
Symbiotic Organisms ◽  
Steel Frame Structure

Abstract Damages resulted from earthquakes are a loss in the economic sector. The structure of multi-story buildings needs an earthquake-proof design with higher performance to reduce such losses. By utilizing the metaheuristic algorithm, this study aims to identify the most compatible brace configuration and profile used in a concentrically braced steel frame structures with minimal total weight and that will meet the safety requirements. This algorithm is suitable owing to the fact that it is able to find solutions to any known optimization problem either through Particle Swarm Optimization (PSO), Symbiotic Organisms Search (SOS), or Differential Evolution (DE). The performance of these algorithms will demonstrated in a form of comparison through a case study of optimizing a 5-span, 6-story steel frame structure. These systems will determine the lightest frame weight, which also correlates to a lower construction cost, without compromising the constraints of SNI 1726:2019, SNI 1727:2020, SNI 1729:2020, and AISC 341-16. Based on the results of data processing, SOS is shown to achieve the highest algorithm performance compared to PSO and DE.

Investigating the effect of infill walls on steel frame structures

2018 ◽  
Vol 4 (1) ◽  
pp. 27
Author(s):  
Osman Fatih Bayrak ◽  
Seda Yedek ◽  
Muhammet Musab Erdem ◽  
Murat Bikce
Keyword(s):  
Steel Frames ◽  
Steel Frame ◽  
Frame Structure ◽  
Frame Structures ◽  
Infill Walls ◽  
Soft Story ◽  
Deformation Properties ◽  
Steel Frame Structures ◽  
Aerated Concrete ◽  
Steel Frame Structure

Infill walls consisting of materials such as hollow concrete, hollow clay and autoclaved aerated concrete bricks are not only preferred in reinforced concrete buildings but also in steel frame structures. It is a well-known fact that infill walls limit the displacement of frames under horizontal loads. However, they may also bring about certain problems due to being placed randomly in horizontal and discontinuously in vertical directions for some architectural reasons. Moreover, cracks in frame-wall joints are observed in steel frame structures in which ductile behaving steel and brittle behaving infill walls are used together. In this study, the effect of infill walls on steel frames has been investigated. In the steel frame structure chosen for the study, four different situations consisting of different combinations of infill walls have been modeled by using ETABS Software. Later, the pushover analyses have been performed for all the models and their results have been compared. As a result of the analyses done by using the equivalent diagonal strut model, it has been found out that infill walls limit the displacement of steel frames and increase the performance of a structure. However, it has been also determined that in the steel frame structure in which the infill walls have been placed discontinuously in vertical and asymmetrically in horizontal, infill walls may lead to torsional and soft story irregularities. As a result, it is possible to observe cracks in the joints of infill walls and steel frame, the deformation properties of which differ, unless necessary precautions are taken.

Standardization Study of Assembly Floor Slab in Steel Frame Structure

2014 ◽  
Vol 638-640 ◽  
pp. 244-249
Author(s):  
Ya Bo Wang ◽  
Gao Feng Dou ◽  
Chuan Hao Xi ◽  
Lei Qian ◽  
Han Ting Liu
Keyword(s):  
Steel Frame ◽  
Frame Structure ◽  
Frame Structures ◽  
Floor Slab ◽  
Steel Frame Structures ◽  
Assembly Floor ◽  
Steel Frame Structure ◽  
At Home

The types of assembly floor slab member and the present development situation of assembly floor slab standardization at home and abroad is presented in the article, as well as assembly floor slab layout schemes and its advantage and disadvantage is presented, and the assembly floor slab standardization scheme is proposed to promote the application of assembly floor slab in steel frame structures.

scholarly journals A Simple Approach for the Design of Ductile Earthquake-Resisting Frame Structures Counting for P-Delta Effect

Buildings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 216
Author(s):  
Shehu ◽  
Angjeliu ◽  
Bilgin
Keyword(s):  
Order Effect ◽  
Simple Approach ◽  
Second Order ◽  
Frame Structures ◽  
Order Effects ◽  
Lateral Loads ◽  
Stability Coefficient ◽  
Internal Forces ◽  
Second Order Effects ◽  
The Stability

In the last decades, the possibility to use the inelastic capacities of structures have driven the seismic design philosophy to conceive structures with ductile elements, able to obtain large deformations without compromising structural safety. In particular, the utilization of high-strength elements combined with the purpose of reducing inertial masses of the construction has highlighted the second-order effect as a result of the “lightweight” structure’s flexibility. Computational aspects of inclusion of the second-order effects in the structural analysis remain an open issue and the most common method in the current design practices uses the stability coefficient θ. The stability coefficient estimates the ratio between the second-order effect and lateral loads’ effects. This coefficient is used then to amplify the lateral loads’ effects in order to consider the second-order effects, within a certain range proposed by codes of practices. In the present paper, we propose a simple approach, as an alternative to the stability coefficient method, in order to take into consideration P-Delta effects for earthquake-resisting ductile frame structures in the design process. The expected plastic deformations, which can be assessed by the behavior factor and the elastic deformations of the structure, are expected to magnify the P-Delta effects compared to those estimated from an elastic approach. The real internal forces are approximated by modifying the stiffness matrix of the structure in such a way as to provide a compatible amplification effect. This concept is herein implemented with a three-step procedure and illustrated with well-documented case studies from the current literature. The obtained results show that the method, although simple, provides a good approximation compared to more refined and computationally expensive methods. The proposed method seems promising for facilitating the design computations and increasing the accuracy of the internal forces considering the second-order effects and the amplification from the inelastic deformations.

scholarly journals The trends and practical look of advanced steel frame structures

2020 ◽  
Vol 16 (3) ◽  
pp. 203-208
Author(s):  
Nikolay I. Vatin ◽  
Tesfaldet Hadgembes Gebre ◽  
Shishay Berhane Gebreslassie
Keyword(s):  
Case Studies ◽  
Steel Frame ◽  
Second Order ◽  
Frame Structures ◽  
Analysis Method ◽  
First Order ◽  
Inelastic Analysis ◽  
Analysis Methods ◽  
Steel Frame Structures ◽  
Advanced Analysis

The aim of the work is to present the trend of the advancement of steel design code and practical approach of steel frame design from the current AISC-LFDR to the advanced analysis. As the trend of steel frame analysis method is from first-order elastic analysis to second-order inelastic analysis which is an advanced analysis. Methods. In this paper the comparison between the load - displacement curves of several structural analysis methods is presented. Case studies are considered to analyze by different methods and comparison of practical advanced analysis method with PROKON software. The case studies includes a two-story one bay steel frame and four bays of twelve-stories steel frame. The results of first-order elastic, elastic buckling, second-order and nonlinear analyses of an unbraced frame are compared and their difference is presents. The proposed software for advanced methods demonstrates the accuracy and the computational efficiency in predicting the nonlinear analysis response of steel frame structures.

Sign in / Sign up

Export Citation Format

Share Document