Displacement-based seismic design of high-strength concrete frame columns

2008 ◽  
Vol 2 (1) ◽  
pp. 93-101
Author(s):  
Guojun Zhang ◽  
Jianxin Liu ◽  
Xilin Lu
Keyword(s):  
Seismic Design ◽  
High Strength Concrete ◽  
High Strength ◽  
Strength Concrete ◽  
Concrete Frame ◽  
Displacement Based ◽  
Displacement Based Seismic Design

Background to seismic design provisions in CSA A23.3–04 for high-strength concrete

2009 ◽  
Vol 36 (4) ◽  
pp. 565-579 ◽  
Author(s):  
Patrick Paultre ◽  
Denis Mitchell
Keyword(s):  
Compressive Strength ◽  
Seismic Design ◽  
High Strength Concrete ◽  
Concrete Strength ◽  
Concrete Structures ◽  
High Strength ◽  
Frame Structure ◽  
Concrete Compressive Strength ◽  
Strength Concrete ◽  
Loading Tests

This paper presents the background experimental and analytical research that was carried out to develop the provisions for the seismic design of high-strength concrete structures in the 2004 Canadian standard CSA A23.3–04. It is noted that the 1994 Canadian standard CSA A23.3–94 limited the concrete compressive strength to 55 MPa for the seismic design of nominally ductile and ductile structures, while the 1995 New Zealand Standard limited the concrete compressive strength to 70 MPa. In contrast, the 2008 American Concrete Institute (ACI) code ACI 318M has no upper limit on concrete strength, even for the seismic design of ductile structural elements. This tremendous variation in these limits indicated that more experimental evidence was needed. This paper presents experimental results of reversed cyclic loading tests on large-scale structural components as well as simulated seismic loading tests of a frame structure constructed with high-strength concrete. The goal of this collaborative research program at the University of Sherbrooke and McGill University was to determine the seismic design and detailing requirements for high-strength concrete structures to achieve the desired level of ductility and energy dissipation. The experimental programs include full-scale testing of the following: columns subjected to a pure axial load (square and circular columns); columns subjected to flexure and axial loads; beam-column subassemblages (square and circular columns); coupling beams in coupled wall structures; shear walls and a two-storey, three-dimensional frame structure. The results of the responses of the high-strength concrete structural specimens are compared with the responses of companion specimens constructed with normal-strength concrete.

scholarly journals Seismic Behavior Analysis of Damaged Steel Fiber-Reinforced High-Strength Concrete Frame Joints Strengthened by FRP

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Wang Tingyan ◽  
Zhou Yun ◽  
Zhang Junwei
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
High Strength Concrete ◽  
Seismic Behavior ◽  
Steel Fiber ◽  
High Strength ◽  
Fiber Reinforced ◽  
Strength Concrete ◽  
Concrete Frame ◽  
Capacity Degradation

In this paper, the seismic behavior of fiber-reinforced polymer (FRP) strengthened and unstrengthened steel fiber-reinforced high-strength concrete frame joints under low cyclic loading was tested. Then, the nonlinear finite element program was used to simulate the seismic behavior of FRP strengthened and unstrengthened steel fiber-reinforced high-strength concrete frame joints under low cyclic repeated load. The influence of FRP bond direction on the seismic behavior of steel fiber-reinforced high-strength concrete frame joints was studied. Through the comparison of the test values and numerical simulation values of the hysteretic curve, skeleton curve, energy dissipation capacity, displacement ductility, bearing capacity degradation, stiffness degradation, and other performance indexes of frame joints, the rule was obtained. The results showed that the 45° bonding direction of carbon fiber cloth is better than the 0° bonding direction, and the digital simulation results are in good agreement with the test results. Therefore, the constitutive model, element, end constraint, and loading method used in the finite element numerical simulation of this paper were reasonable, which can provide reference for the similar research in the future.

The Strain Change Rules of Full-Scale High Strength Concrete Frame Columns with High Axial Compression Rations

2014 ◽  
Vol 919-921 ◽  
pp. 288-291
Author(s):  
Guo Jun Zhang ◽  
Yong Bin Jia ◽  
Xi Lin Lu
Keyword(s):  
Axial Compression ◽  
High Strength Concrete ◽  
Tensile Strain ◽  
High Strength ◽  
Full Scale ◽  
Longitudinal Reinforcement ◽  
Strength Concrete ◽  
Concrete Frame ◽  
Strain Change ◽  
Maximum Tensile Strain

Based on experimental study of 9 full-scale high-strength concrete(HSC) rectangular frame columns with high axial compression ratios, high-strength longitudinal reinforcements and transverse reinforcements and rectangular interlocking ties, their strain change rules of longitudinal reinforcement, stirrups and concrete were discussed and analyzed. The main results indicate as follows. The maximum tensile strain of longitudinal reinforcement decrease and the tensile strain of concrete increase quickly as the axial compression ratios and the strength grades of concrete are higher; the strains of outer stirrups are all the time greater than those of inner stirrups; the single brace stirrups have the same action with the closed stirrups.

scholarly journals Some controversial aspects of the seismic design of reinforced concrete building structures

2003 ◽  
Vol 36 (3) ◽  
pp. 165-188 ◽  
Author(s):  
Bob Park
Keyword(s):  
Reinforced Concrete ◽  
Seismic Design ◽  
High Strength Concrete ◽  
Flexural Rigidity ◽  
Precast Concrete ◽  
High Strength ◽  
Steel Reinforcement ◽  
Capacity Design ◽  
Strength Concrete ◽  
Lateral Deflections

Significant differences exist between the recommendations for seismic design of the codes and guidelines for reinforced concrete of different countries. Performance criteria for building structure to avoid unacceptable damage during various levels of earthquake hazard need to be refined. More accurate recommendation for the effective flexural rigidity of reinforced concrete members are required for linear elastic structural analysis to enable better estimates of the periods of vibration and the lateral deflections of statically indeterminate structures including the effects of cracking of concrete. Current code recommended values for flexural rigidity will generally lead to estimates of the periods of vibration and lateral deflections, which are on the low side. The capacity design approach to ensure the most appropriate mechanism of yielding will occur in the event of a severe earthquake is generally recognized by codes but to varying degrees of clarity, and the degrees to which capacity design is incorporated in each code varies significantly. High strength concrete and high strength non-prestressed steel reinforcement can be used in the design of buildings but the brittle behaviour of high strength concrete and the unusable yield strength of high strength steel reinforcement need to be considered. Important differences between codes exist in the rules for the quantity of confining reinforcement placed in reinforced concrete columns to ensure ductile behaviour. Significant differences also exist between the quantities of shear and confining reinforcement required in beam-column joints and in the anchorage of length of longitudinal reinforcement passing through beam-column joints. Precast concrete structures can be designed successfully for earthquake resistance but design codes in seismic regions contain provisions for precast concrete to varying degrees.

Study on Resilience Model of High-Strength Concrete Frame Columns

2014 ◽  
Vol 919-921 ◽  
pp. 969-972
Author(s):  
Guo Jun Zhang ◽  
Xi Lin Lu ◽  
Bo Quan Liu
Keyword(s):  
High Strength Concrete ◽  
High Strength ◽  
Strength Concrete ◽  
Concrete Frame

Based on the horizontaldisplacements and loads of column at top end deduced according to sectionalbalanceable conditions at yield of high-strength frame columns, the lateralmaximum loads of column at top end calculated according to the Chinese currentconcrete code and involved regressive formulas, the resilience model ofhigh-strength concrete frame columns were established. The main results show:the resilience models of high-strength concrete frame columns proposed in thispaper consider influenced multi-facts and conveniently applied to engineering.

The Seismic Behavior of High-Strength Concrete Frame Joints

2012 ◽  
Vol 238 ◽  
pp. 838-843 ◽  
Author(s):  
Ting Yan Wang ◽  
Jun Wei Zhang ◽  
Dan Ying Gao
Keyword(s):  
High Strength Concrete ◽  
Seismic Behavior ◽  
Steel Fiber ◽  
High Strength ◽  
Element Analysis ◽  
Strength Concrete ◽  
Concrete Frame ◽  
Loading Method ◽  
Reversed Loading ◽  
Joint Core Area

By studying the two high-strength concrete frame joints by means of experimental investigate and finite element analysis with the low cycle reversed loading method, it discussed the influence of the steel fiber on the seismic behavior of the high-strength frame joints. The result shows that, mixed with steel fiber can enhance the constraint of the concrete at the joint core area, improve the seismic behavior. Amount of steel fiber can replace part of the stirrup.

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