Discussion of “Full-Range Analysis of Concrete Frames”

1974 ◽  
Vol 100 (6) ◽  
pp. 1319-1321
Author(s):  
Vladimir C. Kalevras
Keyword(s):  
Full Range ◽  
Concrete Frames ◽  
Range Analysis

Full-Range Analysis of Concrete Frames

1973 ◽  
Vol 99 (8) ◽  
pp. 1761-1783
Author(s):  
Angel L. Lazaro ◽  
Rowland Richards
Keyword(s):  
Full Range ◽  
Concrete Frames ◽  
Range Analysis

scholarly journals NONLINEAR MULTILEVEL ANALYSIS OF REINFORCED CONCRETE FRAMES

2016 ◽  
Vol 7 (4) ◽  
pp. 168-176 ◽  
Author(s):  
Pui Lam Ng ◽  
Jeffery Yuet Kee Lam ◽  
Albert Kwok Hung Kwan
Keyword(s):  
Reinforced Concrete ◽  
Multilevel Analysis ◽  
Crack Opening ◽  
Full Range ◽  
Analysis Method ◽  
Concrete Frames ◽  
Range Analysis ◽  
Strength Deterioration ◽  
Rc Frames ◽  
Frame Member

Full range analysis of reinforced concrete (RC) members covering the post-crack and post-peak regimes is important for obtaining the deformation response and failure mode of structural members. When a RC member is subject to an increasing external load, the critical sections would exhibit cracking and/or softening. Due to stress relief effect in the proximity of crack opening and plastic hinging, unloading may occur at the adjacent regions. The variable stress states of discrete sections would lead to sectional variation of stiffness, which could not be accounted for by conventional structural analysis methods. In this paper, a nonlinear multilevel analysis method for RC frames whereby the frame members are divided into sub-elements and sectional analysis is utilised to evaluate stiffness degradation and strength deterioration is developed. At sectional level, the secant stiffness is determined from moment-curvature relation, where the curvature is evaluated based on both transverse displacements and section rotations of the frame member. Unloading and reloading behaviour of concrete and reinforcing steel is simulated. In implementing the multilevel analysis, secant iteration is performed in each step of displacement increment to obtain the convergent solution satisfying equilibrium. Numerical example of RC frame is presented to demonstrate the applicability and accuracy of the proposed nonlinear multilevel analysis method.

Plastic Hinge Lengths of Normal and High-Strength Concrete in Flexure

2002 ◽  
Vol 4 (4) ◽  
pp. 189-195 ◽  
Author(s):  
P. Mendis
Keyword(s):  
High Strength Concrete ◽  
Strain Softening ◽  
Plastic Hinge ◽  
Full Range ◽  
High Strength ◽  
Upper And Lower Bounds ◽  
Range Analysis ◽  
Strength Concrete ◽  
Plastic Phase ◽  
Flexural Hinges

Full-range analysis methods are becoming popular in design of reinforced concrete structures. These methods require a knowledge of the behaviour of plastic hinges up to advanced curvatures. Concrete sections characteristically soften beyond the plastic phase. To analyse a strain-softening structure, many researchers have used a finite hinge length. In this paper, existing formulae are re-examined and the effects of different variables on hinge length are discussed. Experimentally measured values are compared with the values predicted by using these formulae. It is shown that the upper and lower bounds suggested by the ACI committee 428 provide reliable estimates of hinge lengths for both normal and high-strength concrete flexural hinges up to 80 MPa.

scholarly journals Axial Compression Behavior of Circular Concrete-Filled High-Strength Thin-Walled Steel Tubular Columns with Out-of-Code D/t Ratios

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Jun-Xin Li ◽  
Jian-Tao Wang ◽  
Qing Sun ◽  
Yan-Ru Wu ◽  
Shi-Ming Zhou ◽  
...  
Keyword(s):  
Axial Compression ◽  
Full Range ◽  
High Strength ◽  
Displacement Curve ◽  
Fe Model ◽  
Range Analysis ◽  
Cross Sectional ◽  
Compression Behavior ◽  
Thin Walled ◽  
Cfst Columns

This paper systematically investigated the axial compression behavior of circular concrete-filled high-strength thin-walled steel tubular (CFHTST) columns with out-of-code diameter-to-thickness (D/t) ratios. The axial compression test was first conducted to examine the failure mode, load-displacement curves, and composite mechanism effect. The finite element (FE) model was thereafter established to perform full-range analysis on the load versus displacement curve as well as the interaction behavior, where the parametric study was performed to investigate the influences of the material strengths and geometric sizes. Subsequently, the applicability of typical design methods was evaluated, and a revised equation for determining strain εscy corresponding to ultimate strength was established to assess the plastic deformation capacity of CFHTST columns. Finally, a theoretical model for calculating axial bearing capacity was derived based on unified twin-shear strength theory by considering the influence of intermediate principal stress. The research results indicate that a relatively high confine effect can be guaranteed for CFHTST columns under out-of-code D/t ratios, given that the ratio Nu/Nnom between the measured capacity (Nu) and nominal cross-sectional capacity (Nnom) mainly distributes within 1.179∼1.292; the full-range analysis reflects that the axial load-deformation curve can be distinguished by four various loading stages; the scope b = 0.3∼0.55 of intermediate stress coefficient is generally suggested for predicting axial strength of circular CFST columns within an error of ±5%. The abovementioned study can provide the meaningful design reference for the analysis and application of CFHTST columns.

scholarly journals Numerical Behaviour of Composite K-Joints Subjected to Combined Loading and Corrosive Environment

2018 ◽  
Author(s):  
Chao Hou ◽  
Shameer Saleh ◽  
Lin-Hai Han ◽  
You-Xing Hua
Keyword(s):  
Failure Modes ◽  
Full Range ◽  
Steel Tube ◽  
Combined Loading ◽  
Truss Structures ◽  
Mechanism Analysis ◽  
Corrosive Environment ◽  
Range Analysis ◽  
Element Analysis ◽  
Fea Model

Concrete filled steel tubular (CFST) truss structures have been adopted in various infrastructures worldwide for past several decades. Application of CFST truss is more prevalent especially in areas where harsh marine condition with chloride corrosion limits the design life of structures. Design of joints is one of the most complicated issues in CFST truss structures; and it becomes more critical when corrosion causes section loss in the outer steel tube. Improved designs in terms of economy and durability need to be suggested based on rational research on composite K-joints in corrosive environment, whilst such research is very limited up until now. This paper thus attempts to study the behaviour of circular concrete filled steel tubular (CFST) K-joints under combined effect of long-term loading and corrosion. A finite element analysis (FEA) model is presented and verified against existing test results. The model is then utilized to perform mechanism analysis of CFST K-joints under varying loading and corrosion situations. Failure modes, detailed propagation of yield and stress distribution between the core concrete in chord and the tubular steel is investigated, based on which a favourable mode of failure is suggested in terms of maximum joint capacity. Finally, a full range analysis of the load-deformation characteristics is carried out for various corrosion situations, with the corresponding joint strength as well as ductility predicted.

Finite Element Analysis of Concrete-Filled Double Skin Steel Tubes with Simply Supported under Lateral Impact

2013 ◽  
Vol 405-408 ◽  
pp. 1106-1109 ◽  
Author(s):  
Xian Hui Li ◽  
Jian Ping Lei ◽  
Rui Wang
Keyword(s):  
Boundary Condition ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Full Range ◽  
Lateral Impact ◽  
Range Analysis ◽  
Steel Tubes ◽  
Element Analysis ◽  
Simply Supported ◽  
Double Skin

In this paper, the behavior of concrete-filled double skin steel tubes (CFDST) with simply supported boundary condition was analyzed by Finite Element Analysis method. The Finite Element analysis mode was established and the results have a good consistent with experimental results. The work mechanic and full range analysis of concrete filled double steel tube under lateral impact were analyzed, the results show that the damage of CFDST with simply supported boundary condition under lateral impact is in ductile manner.

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