Comparison of Seismic Behaviors of Interior Joints in PT and RC Flat Plate Systems

2007 ◽  
Vol 348-349 ◽  
pp. 741-745
Author(s):  
Young Mi Park ◽  
Sang Whan Han ◽  
Jong Hyuk Ryu
Keyword(s):  
Flat Plate ◽  
Seismic Performance ◽  
Shear Walls ◽  
Actual Behavior ◽  
Lateral Loads ◽  
Moment Frames ◽  
Gravity Load ◽  
Load Carrying ◽  
Rc Slab ◽  
Seismic Behaviors

The purpose of this study is to compare the seismic behaviors of interior post-tensioned (PT) and reinforced concrete (RC) flat plate slab-column connections designed to resist only gravity loads. In general, flat plate systems have been used to support gravity loads, which should be constructed with lateral system such as shear walls or moment frames. Flat plate systems should retain the ability to undergo the lateral drift associated with the lateral system without loss of gravity load carrying capacity. Although these systems are common, relatively little experimental study has been conducted to assess actual behavior under lateral loads. Therefore, this study was undertaken to assess the seismic performance of two PT and one RC slab-column interior connection under high gravity loads. This study observed that PT connections had a better seismic performance than corresponding RC connections in terms strength, deformability, energy absorption.

Experimental Study on Seismic Performance of Mid-Rise Composite Shear Walls with CFT Columns and Embedded Steel Plate

2010 ◽  
Vol 163-167 ◽  
pp. 2274-2284
Author(s):  
Jian Wei Zhang ◽  
Wan Lin Cao ◽  
Hong Ying Dong ◽  
Gang Li
Keyword(s):  
Seismic Performance ◽  
Steel Plate ◽  
Shear Walls ◽  
Shear Wall ◽  
Steel Tube ◽  
Steel Plates ◽  
Load Carrying ◽  
Practical Engineering ◽  
Composite Shear ◽  
Hysteresis Characteristics

The shear wall with concrete filled steel tube (CFT) columns and steel plate is a new kind of composite shear wall. In order to know its seismic performance and failure mechanism, six 1/5 scale specimens with the same shear span ratio 1.5, including 3 steel plate shear walls (SPSWs) with CFT columns and 3 reinforced concrete shear walls (RCSWs) with CFT columns and embedded steel plate, were tested under cyclic loading. The thickness of the steel plates in the shear walls changed from 2mm, 4mm to 6mm. Based on the experiment, the load-carrying capacity, hysteresis characteristics, ductility, stiffness degradation, energy dissipation and damage characteristics of the specimens were analyzed. Especially, the ratio of height to sectional thickness of the steel plates in the shear wall was considered. The result shows that both the SPSW with CFT columns and the RCSW with CFT columns and embedded steel plate have good seismic performance and are with important practical engineering value.

A FEMA P695 Study for the Proposed Seismic Performance Factors for Cold-Formed Steel Special Bolted Moment Frames

2013 ◽  
Vol 29 (1) ◽  
pp. 259-282 ◽  
Author(s):  
Atsushi Sato ◽  
Chia-Ming Uang
Keyword(s):  
Seismic Performance ◽  
Moment Frames ◽  
Acceptance Criteria ◽  
Performance Factors ◽  
Gravity Load ◽  
Cold Formed Steel

The objective of this study was to verify the adequacy of the proposed Seismic Performance Factors for the newly developed Cold-Formed Steel Special Bolted Moment Frames in the AISI S110 Seismic Standard. The FEMA P695 methodology, Qualification of Building Seismic Performance Factors, was used for this purpose. A total of 13 archetype designs, representing two seismicity and two gravity load levels, were designed and analyzed. The computed results from all individual archetypes and four performance groups showed that the proposed seismic performance factors met the acceptance criteria and could provide a sufficient margin against collapse under the maximum considered earthquake.

Experimental Study and Theoretical Analysis on Seismic Performance of RC Shear Wall with STRC Columns and Embedded Steel Plate

2012 ◽  
Vol 446-449 ◽  
pp. 1006-1013 ◽  
Author(s):  
Wan Lin Cao ◽  
Hong Ying Dong ◽  
Jian Wei Zhang
Keyword(s):  
Seismic Performance ◽  
Carrying Capacity ◽  
Steel Plate ◽  
Shear Walls ◽  
Shear Wall ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Rc Shear Wall ◽  
Composite Shear ◽  
Steel Trusses

RC shear wall with STRC (steel tube-reinforced concrete) columns and embedded steel plate has been proposed and used in the project of an International Conference Center. In order to ascertain the seismic performance of this kind of composite shear walls with different openings in the practical engineering, four 1/7 scale specimens with shear span ration 2.0 were tested under low-frequency cyclic loading. The load-carrying capacity, ductility, stiffness and its attenuation, hysteretic property, energy dissipation capacity and failure mode of the specimens were analyzed. The effect of the embedded steel plate and the concealed steel trusses on the seismic performance of the walls was studied. The results show that the ductility and load-carrying capacity of RC shear wall are improved greatly by setting the embedded steel plate or concealed steel trusses in the wall; The embedded steel plate and the concrete work very well through the stud connectors welded on the steel plate and the tie bars inserted in the walls; The STRC columns have the advantage of higher load-carrying capacity, not easy to crack and better ductility; The new composite shear wall has good seismic performance and important practical value. It is suitable for large and complex application of high-rise buildings in the seismic regions.

Safety of gravity-load columns in shear wall buildings designed to Canadian standard CSA A23.3

2010 ◽  
Vol 37 (11) ◽  
pp. 1451-1461 ◽  
Author(s):  
Perry Adebar ◽  
Poureya Bazargani ◽  
James Mutrie ◽  
Denis Mitchell
Keyword(s):  
Nonlinear Analysis ◽  
Plastic Hinge ◽  
Shear Walls ◽  
Canadian Standard Association ◽  
Design Rule ◽  
Seismic Demands ◽  
Gravity Load ◽  
Load Carrying ◽  
Bar Buckling ◽  
Design Earthquake

It has been a Canadian code requirement for 25 years to check whether concrete gravity-load columns can tolerate the building deformations due to the design earthquake; but the way this has typically been done using linear analysis significantly underestimates the seismic demands on gravity-load columns. Concern about the safety of gravity-load columns over the plastic hinge height of concrete shear walls, particularly elongated wall-like gravity-load columns, has resulted in new design requirements in Update No. 3 of Canadian Standard Association (CSA) A23.3–04 issued in August 2009. The current paper provides the background to these new requirements. If nonlinear analysis is not done, closely spaced seismic hoops shall be provided in all columns and walls that support gravity loads, and these members shall meet the same limit on maximum compression strain depth as concrete shear walls. The results of nonlinear analyses were used to validate this simple design rule, and to investigate factors that increase seismic demands on gravity-load columns such as diagonal cracking of concrete shear walls, localized damage of columns from cover spalling and bar buckling, and larger first storey heights. Nonlinear analysis has shown that 2.4 m (8 ft) long columns can lose over 50% of their axial load carrying capacity at an inelastic drift ratio of only 1%.

Experimental Study on Seismic Behavior of Meshwork Cold-Formed Thin-Wall Steel RC Shear Wall

2011 ◽  
Vol 368-373 ◽  
pp. 1943-1948 ◽  
Author(s):  
Liang Chen ◽  
Zhong Fan Chen
Keyword(s):  
Seismic Performance ◽  
Seismic Behavior ◽  
Failure Modes ◽  
Residential Buildings ◽  
Shear Walls ◽  
Shear Wall ◽  
Wall Structure ◽  
Thin Wall ◽  
Lateral Loads ◽  
Rc Shear Wall

CTSRC structure is a new composite structural system for residential buildings and it consists of walls and floors which are made of the prefabricated steel skeleton and the infill of concrete. Four pieces of CTSRC shear wall specimens and one piece of RC shear wall specimen are tested under low cyclic lateral loads to study the final failure modes and analyze its structural seismic performance. It shows that the CTSRC shear wall structure possess adequate bearing capacity, fine seismic performance and ductility. CTSRC shear walls are better than RC shear walls in the seismic behavior, and it could replace traditional shear walls structure applying to practical engineering. Inserting ring used for connecting profile steel can transfer stress well and it is recognized as a reasonable construction measure.

Seismic Performance of RC Shear Walls with Concealed Bracing

2003 ◽  
Vol 6 (1) ◽  
pp. 1-13 ◽  
Author(s):  
W. L. Cao ◽  
S. D. Xue ◽  
J. W. Zhang
Keyword(s):  
Seismic Performance ◽  
Carrying Capacity ◽  
Shear Walls ◽  
Shear Wall ◽  
Hysteretic Behavior ◽  
Load Carrying Capacity ◽  
Building Structures ◽  
Load Carrying ◽  
New Type ◽  
Rc Shear Wall

Reinforced concrete shear walls play an important role in improving seismic performance of building structures. In this paper, a new type of RC shear wall with concealed bracing is proposed and investigated. Four 1:3 scale medium-height specimens were designed and a detailed experimental investigation carried out. The load-carrying capacity, stiffness, ductility, hysteretic behavior and energy dissipation of the shear wall are discussed. The failure mechanism was revealed by the experiments. It is found that in comparison with a normal shear wall, the seismic performance of a shear wall can be significantly improved by adding concealed bracing within the wall panel. Finally, a mechanical model of the shear wall is proposed and formulae for calculating load-carrying capacity developed. It is shown that the theoretical results agree well with those from experiments.

scholarly journals Effect of Stiffener Characteristics on the Seismic Behavior and Fracture Tendency of Steel Shear Walls

2020 ◽  
Vol 14 (54) ◽  
pp. 104-115
Author(s):  
Osman Shallan ◽  
Hassan Maaly ◽  
Mohammed Elgiar ◽  
Alaaeldin Elsisi
Keyword(s):  
Energy Dissipation ◽  
Carrying Capacity ◽  
Seismic Behavior ◽  
High Performance ◽  
Shear Walls ◽  
Plane Wall ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Energy Dissipation Capacity ◽  
Seismic Behaviors

The steel plate shear walls (SPSW) are currently being considered as a lateral load resisting system. A numerical method was proposed to have a comprehensive comparison of seismic behaviors of the plane wall (PW) and stiffened plane wall (SPW) with different stiffener characteristics, having the same weight, by using finite element modeling (FEM). The model was validated by using previously published experimental works. The material and geometric nonlinearity were taken into consideration. In this paper, the effect of using stiffeners with different cross-section shapes and directions will be studied, and key issues, such as load-carrying capacity, stiffness, and energy dissipation capacity, were discussed in depth. It was found that the proposed SPW with horizontal L, T, and U stiffeners could effectively improve load-carrying capacity by about 4, 20, and 23%, respectively. Diagonally and horizontally, SPWs with U stiffeners have higher energy-dissipation capacity than PW by about 57, 50%, respectively. This method provides a combination of high-performance stiffeners form and material for improving the seismic behavior of SPW.

scholarly journals Seismic performance of steel moment and hinged frames with rocking shear walls

2021 ◽  
Author(s):  
Mehrdad Piri ◽  
Ali Massumi
Keyword(s):  
Seismic Performance ◽  
Time History ◽  
Shear Walls ◽  
Seismic Energy ◽  
Shear Wall ◽  
3D Models ◽  
Initial Position ◽  
Economic Effects ◽  
Moment Frames ◽  
Nonlinear Time History

Abstract The addition of a rocking structural system will soften the connection between a foundation and superstructure and help the beam-column connections to become softer than typical ones. These structures, with the addition of rocking structural systems, follow the elastic gap opening mechanism to soften the structural seismic response. Post-tensioned energy dissipating devices and dampers are used in rocking systems to enable the structure to return to its initial position (self-centering) and to dissipate seismic energy, respectively. The current study investigated the use of a rocking shear wall system in steel moment-resistant and hinged frames and determined the amount of damage and the economic effects on the structures. For this purpose, 3D models of 3-, 9-, and 20-story SAC-project steel frames were modeled and validated according to FEMA-355C and then a hybrid rocking shear wall was added to them. The structures were designed and modeled according to common seismic codes and were analyzed using nonlinear time history when subjected to a series of records from FEMA-355C. The results showed that the use of a hinged frame attached to a rocking concrete shear wall (HFR) increased the fundamental period and inter-story displacement and decreased the amount of steel used in the 3-, 9-, and 20-story models compared to similar models with fixed connections in moment frames (MFR). The HFR shear wall models exhibited better seismic performance than MFR models, which increased their load-bearing capacity and reduced their weight, which reduced construction costs.

The Studies of the High Seismic Performance RC Shear Walls

2006 ◽  
Author(s):  
Wen-I. Liao ◽  
Yi-Lung Mo
Keyword(s):  
Seismic Performance ◽  
Principal Direction ◽  
Shear Walls ◽  
Test Results ◽  
Tensile Direction ◽  
Model Based ◽  
Simulation Based ◽  
Seismic Behaviors ◽  
Critical Regions ◽  
Applied Stresses

In order to improve the ductility of shear walls under earthquake loading, high seismic performance shear walls have been proposed to have steel bars in the same direction as the principal direction of applied stresses in the critical regions of shear walls. This paper presents the test results and model-based simulation of two shear walls under shake table excitation and two shear walls under reversed cyclic loading. Based on the experimental results, the tested shear walls with reinforcement oriented close to the principal tensile direction of applied stresses have greater ductility than that of the conventional shear wall. The model-based simulation based on the Cyclic Softened Member Model (CSMM) is performed and compared with the test results. The comparison shows that CSMM can well predict the seismic behaviors of the shear walls.

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