Lateral Force Resisting Systems Made of Cold-Formed Steel Material: Proposal of Seismic Design Criteria for 2nd Generation of Eurocode 8

2021 ◽  
Vol 885 ◽  
pp. 127-132
Author(s):  
Sarmad Shakeel ◽  
Alessia Campiche
Keyword(s):  
Seismic Design ◽  
Shear Walls ◽  
Lateral Force ◽  
Background Information ◽  
Design Criteria ◽  
Eurocode 8 ◽  
Building Structures ◽  
Design Standards ◽  
Design Strength ◽  
Cold Formed Steel

The current edition of Eurocode 8 does not cover the design of the Cold-Formed steel (CFS) building structures under the seismic design condition. As part of the revision process of Euro-code 8 to reflect the outcomes of extensive research carried out in the past decade, University of Naples “Federico II” is involved in the validation of existing seismic design criteria and development of new rules for the design of CFS systems. In particular, different types of Lateral Force Resisting System (LFRS) are analyzed that can be listed in the second generation of Eurocode 8. The investigated LFRS’s include CFS strap braced walls and CFS shear walls with steel sheets, wood, or gypsum sheathing. This paper provides the background information on the research works and the reference design standards, already being used in some parts of the world, which formed the basis of design criteria for these LFRS systems. The design criteria for the LFRS-s common to CFS buildings would include rules necessary for ensuring the dissipative behavior, appropriate values of the behavior factor, guidelines to predict the design strength, geometrical and mechanical limitations.

scholarly journals Reliability basis for assessment of existing building structures with reference to sans 10160

2021 ◽  
Vol 63 (1) ◽  
Author(s):  
M Holický ◽  
J V Retief ◽  
C Viljoen
Keyword(s):  
South Africa ◽  
Alternative Assessment ◽  
Structural Reliability ◽  
Background Information ◽  
Design Stage ◽  
Engineering Practice ◽  
Building Structures ◽  
Design Standards ◽  
Structural Assessment ◽  
Existing Building

The principles of structural reliability are firmly established to provide the basis for structural performance as incorporated in design standards. Reliability-based procedures provide for variabilities and uncertainties that could reasonably be expected during the design service life of the structure. However, not all possible conditions to which all structures are exposed during such an extended service period can be accounted for effectively and economically at the design stage. The assessment of the reliability performance of an existing structure therefore forms an integral part of structural management and engineering practice. Despite the lag between the development and implementation of a basis for design and assessment of structures, the extensive body of information on structural assessment progresses steadily towards standardisation. This paper provides a review of the progress to provide background information towards extending the scope of South African structural standards to include guidance on structural assessment. The focus is on such developments to include provisions for existing structures in Eurocode, together with related investigations. In addition to a general review of background investigations, interrelationships between the basis of design and assessment for Eurocode (potentially also for South Africa) are considered. The main elements of a standardised basis for assessment are defined, and alternative assessment approaches are presented and demonstrated by representative examples. In conclusion, an outline of a possible development path for implementation in South Africa is provided.

scholarly journals Methods for conceptual and preliminary seismic design of buildings with steel structure

2019 ◽  
Vol 11 (2) ◽  
Author(s):  
Tiago Ribeiro ◽  
Ana Sousa
Keyword(s):  
Seismic Design ◽  
Steel Structure ◽  
Steel Structures ◽  
Eurocode 8 ◽  
Seismic Action ◽  
The European Union ◽  
Design Standards ◽  
Design Guide ◽  
Current Context ◽  
Earthquake Effects

Throughout the last two decades, seismic design standards evolved to ever more comprehensive and detailed prescriptions, stressing out the need for design methods that deal with earthquake effects not as actions, but as a design philosophy. The Eurocode 8 adoption as national law throughout the European Union countries and informally in many parts of Africa, Asia and Latin America is the pretext for the current study. It aims to provide some guidance to the seismic design of steel structures as well as to the Eurocode 8 implementation by the designers.Some lines on the preliminary design of structural systems were written based on several real cases of structures designed taking into account the seismic action. Such a content is, usually, relevant in any design guide, given its value in enhancing the design technical and economical content. However, it is now of utter significance at the current context as an essential tool to facilitate the safety checking of several code requirements.Some of the Eurocode 8 prescriptions are then decoded, explained and justified based on the supportive bibliography. The information is subsequently ordered as a design guide, where some procedures are proposed to cope with the code interrelated prescriptions and one structural solution is proposed in order to overcome a design challenge while complying with the code.One last but not less relevant addressed issue is the fact that some Eurocode 8 prescriptions may be reviewed, in the eyes of a designer, given its practical outcome. Such issues are identified, explained and some slight code adjustments are suggested.

Comparison between Contemporary Architectural Form in Cities with High versus Low Seismicity

2009 ◽  
Vol 25 (1) ◽  
pp. 1-15 ◽  
Author(s):  
Andrew Charleson
Keyword(s):  
Seismic Design ◽  
Shear Walls ◽  
Lateral Force ◽  
Unexpected Result ◽  
Structural Elements ◽  
Structural Walls ◽  
Design Constraints ◽  
Architectural Form ◽  
System A ◽  
High Seismicity

This study investigates whether seismic design constraints reduce the architectural interest of buildings in areas subject to high rather than low seismicity. Sixty-three of the most architecturally interesting low-rise buildings from 20 cities, half of which are located in high-seismicity zones, were assessed aesthetically and analyzed structurally. On average, each group of buildings was found to possess the same level of architectural interest and degree of configuration irregularity. Reinforced concrete shear walls were found to be the predominant lateral force resisting system. A concentration of building types in the low-seismicity set of buildings that used structural walls for physical security and other purposes led to the unexpected result of those buildings possessing significantly greater structural footprints than buildings from high-seismicity areas. This finding serves as a reminder that structural elements play far more roles in architecture than merely resisting lateral forces.

New Provisions for the Seismic Design of Composite and Hybrid Structures

2000 ◽  
Vol 16 (1) ◽  
pp. 163-178 ◽  
Author(s):  
Gregory G. Deierlein
Keyword(s):  
Seismic Design ◽  
Composite Structures ◽  
Seismic Loading ◽  
Building Code ◽  
Design Criteria ◽  
Building Structures ◽  
Seismic Safety ◽  
Steel Reinforced Concrete ◽  
Concrete Building ◽  
Composite Steel

While there have been significant advances in the design and construction of composite steel-concrete building structures, their use in regions of high seismicity has been hindered by the lack of design criteria in building codes and specifications. This has prompted initiatives in the Building Seismic Safety Council and the American Institute of Steel Construction to develop seismic design provisions for composite structures. The 1997 edition of the AISC Seismic Provisions includes a new section with requirements for composite steel-concrete structures that are cross-referenced by the general seismic loading and design criteria in the 1997 NEHRP Provisions and the 2000 International Building Code (final draft). Intended to complement existing provisions for steel, reinforced concrete and composite structures in the AISC-LRFD Specification and the ACI 318 Building Code, these new provisions provide an important resource for seismic design of composite structural systems, members, and connections.

scholarly journals COUPLING BEAM DESIGN WITH SPECIAL MOMENT FRAME AND SPECIAL REINFORCED CONCRETE SHEAR WALLS

Neutron ◽  
2019 ◽  
Vol 18 (2) ◽  
pp. 28-41
Author(s):  
Agyanata Tua Munthe ◽  
Muklish Nalahuddin
Keyword(s):  
Shear Walls ◽  
Shear Wall ◽  
Lateral Force ◽  
Structure Design ◽  
Structural Deformation ◽  
Building Structures ◽  
Coupling Beam ◽  
Moment Frame ◽  
Beam Design ◽  
Earthquake Force

An Earthquake is on of the natural phenomena that cannot be avoided or cannot be prevented by its appearance which is very difficult to accurately predict both from the time and place of its occurrence. Shear wall system is used to increase the sitffness of many multi-storey building, in this case building that have more than 20 floors. Building structures with shear wall as retaining element of lateral force generally have good performance during an earthquake. Coupling beam is an connecting beam betweem two shear walls, this beam makes a series of shear walls works as a system that is able to withstand earthquake force. Coupling beam also make the working structure rigid and absorbs energy due to the very high rigidity of the coupling beam with shear wall behaving link two free cantilevers. Coupling beam is considered to be able to transmit shear force from one wall to another so that it can withstand large structural deformation. Structure design material strenght for concrete  fc’ 35MPa ~ fc 55’MPA and rebar (D10 & D13) using fy 520MPa and fy 420MPa for diameter >16mm. While the regulations used are SNI 1726: 2012, SNI 1727: 2013, and SNI 2847: 2013. Structural loading is given according to loading rules which are then analyzed using ETABS 2016 software.

scholarly journals Comparative Analysis of RC Irregular Buildings Designed According to Different Seismic Design Codes

2013 ◽  
Vol 7 (1) ◽  
pp. 221-229 ◽  
Author(s):  
Jaime Landingin ◽  
Hugo Rodrigues ◽  
Humberto Varum ◽  
António Arêde ◽  
Aníbal Costa
Keyword(s):  
Seismic Design ◽  
Residential Buildings ◽  
Response Spectrum ◽  
Bending Moment ◽  
Lateral Force ◽  
Frame Structure ◽  
Eurocode 8 ◽  
Design Codes ◽  
Concrete Frames ◽  
Rc Frame Structure

The present paper presents a comparison of seismic provisions of three seismic design codes, the Philippine code, Eurocode 8 and the American code, to the most common ordinary residential frames of standard occupancy. Regular and irregular reinforced concrete frames were analyzed and compared for four storey building types. The response spectrum and the seismic parameters of NSCP 2010 were considered for the horizontal load action with different load combinations. Response spectrum analysis and equivalent lateral force analysis were performed using SAP2000 software package. Five representative columns for each RC frame structure were analyzed. Based on the results of column axial load - bending moment interaction diagrams, EC8 was found to be conservative when compared to NSCP 2010 and 2009 IBC. The conclusion is that for the design and analysis of ordinary RC residential buildings with certain irregularity, EC8 provisions were considered to be safer.

scholarly journals Lateral resistance of mass timber shear wall connected by withdrawal-type connectors

2021 ◽  
Vol 67 (1) ◽  
Author(s):  
Sung-Jun Pang ◽  
Kyung-Sun Ahn ◽  
Seog Goo Kang ◽  
Jung-Kwon Oh
Keyword(s):  
Experimental Data ◽  
Seismic Design ◽  
Shear Walls ◽  
Shear Wall ◽  
Vertical Load ◽  
Lateral Resistance ◽  
Kinematic Models ◽  
Mass Timber ◽  
Timber Shear Walls ◽  
Timber Shear Wall

AbstractIn this study, the lateral resistances of mass timber shear walls were investigated for seismic design. The lateral resistances were predicted by kinematic models with mechanical properties of connectors, and compared with experimental data. Four out of 7 shear wall specimens consisted of a single Ply-lam panel and withdrawal-type connectors. Three out of 7 shear wall specimens consisted of two panels made by dividing a single panel in half. The divided panels were connected by 2 or 4 connectors like a single panel before being divided. The applied vertical load was 0, 24, or 120 kN, and the number of connectors for connecting the Ply-lam wall-to-floor was 2 or 4. As a result, the tested data were 6.3 to 52.7% higher than the predicted value by kinematic models, and it means that the lateral resistance can be designed by the behavior of the connector, and the prediction will be safe. The effects of wall-to-wall connectors, wall-to-floor connectors and vertical loads on the shear wall were analyzed with the experimental data.

scholarly journals Parametric Analysis of Rotational Effects in Seismic Design of Tall Structures

2021 ◽  
Vol 11 (2) ◽  
pp. 597
Author(s):  
Milan Sokol ◽  
Rudolf Ároch ◽  
Katarína Lamperová ◽  
Martin Marton ◽  
Justo García-Sanz-Calcedo
Keyword(s):  
Seismic Design ◽  
Parametric Study ◽  
Tall Buildings ◽  
Soil Parameters ◽  
Eurocode 8 ◽  
Tall Structures ◽  
Rotational Components ◽  
Different Types ◽  
Depth Study

This paper uses a parametric study to evaluate the significance of the rotational components of Earth’s motion in a seismic design. The parametric study is based on the procedures included in Eurocode 8, Part 6. Although the answer to the question of when the effects of rotational components are important is quite a complex one and requires a more in-depth study, our aim was to try to assess this question in a relatively quick manner and with acceptable accuracy. The first part of the paper is devoted to derivation of a simple formula that can be used for expressing the importance of rotational components in comparison with the classic seismic design without their usage. The quasi-static analysis, assuming inertial forces, is used. A crucial role plays the shape of the fundamental mode of the vibration. Due to simplicity reasons, well-known expression for estimation of the first eigenmode as an exponential function with different power coefficients that vary for different types of buildings is used. The possibility of changing the soil parameters is subsequently included into the formula for estimation of the fundamental frequency of tall buildings. In the next part, the overall seismic analyses of complex FEM models of 3D buildings and chimneys are performed. The results from those analyses are then compared with those from simplified calculations. The importance of the soil characteristics for determination of whether it is necessary to take into account the rotational effects is further discussed.

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