NONLINEAR STRUT–AND–TIE MODEL WITH BOND–SLIP EFFECT FOR ANALYSIS OF RC BEAM–COLUMN JOINTS UNDER LATERAL LOADING

2018 ◽  
Vol 15 (47) ◽  
Author(s):  
Rattapon Ketiyot
Keyword(s):  
Lateral Loading ◽  
Rc Beam ◽  
Slip Effect ◽  
Bond Slip ◽  
Strut And Tie ◽  
Strut And Tie Model

scholarly journals Behavior predictions of deep beams with short straight bar anchorages using strut-and-tie models and nonlinear analysis

2016 ◽  
Vol 9 (5) ◽  
pp. 710-721
Author(s):  
R. A. SOUZA ◽  
S. BREÑA
Keyword(s):  
Nonlinear Analysis ◽  
Longitudinal Reinforcement ◽  
Deep Beams ◽  
Bond Slip ◽  
Crack Control ◽  
Strength Factor ◽  
Strut And Tie ◽  
Effective Strength ◽  
Laboratory Test Results ◽  
Strut And Tie Model

Abstract This paper investigates the laboratory test results of 12 deep beams available in the literature, where the longitudinal reinforcement was anchored into the support using short straight bar anchorages. Four different specimen groups with three different shear span-to-depth ratios (a/d) were selected and most of the deep beams failed by strut crushing after yielding of the main longitudinal reinforcement. In order to investigate the behavior of the selected deep beams, an enhanced strut-and-tie model assuming geometrical adaptability (possibility of update in the dimensions of the struts and ties as the main tie starts to yield) is proposed. The analytical results obtained using this approach may be considered as much as accurate than some conducted complex nonlinear analysis considering smeared fixed cracking model and bond-slip behavior. However, an improvement on the effective strength factor of bottle-shaped struts by means of an iterative strut-and-tie model is needed, once the effective strength factor prescribed by NBR6118 (2014) has shown to be over conservative for all ranges of span-to-depth ratio (a/d) investigated. Finally, the obtained results indicated that short bar anchorages did not seem to influence significantly the shear strength of the deep beams investigated, especially the strength of bottled-shaped struts when appropriate crack control reinforcement is present.

Shear Strength Prediction of RC Beam-column Sandwich Interior Joints Based on Simplified Softened Strut-and-Tie

2017 ◽  
Vol 11 (1) ◽  
pp. 933-939
Author(s):  
Liqun Hou ◽  
Weiming Yan ◽  
Shicai Chen ◽  
Ruiyun Zhang ◽  
Yue Qi
Keyword(s):  
Shear Strength ◽  
Core Area ◽  
Rc Beam ◽  
Calculation Methods ◽  
Joint Shear Strength ◽  
Strength Concrete ◽  
Rational Models ◽  
Strut And Tie ◽  
Rational Calculation ◽  
Strut And Tie Model

Introduction: The sandwich joints casted core area with weaker strength concrete of beam, has more advantages than the traditional joints casted core area with higher strength concrete of column, such as the simple construction and quality assurance, while China design codes are too simple about the sandwich joints and have no clear calculation methods. Methods: Due to the scarcity of rational models for predicting the strength of RC beam-column sandwich joints, a modified simplified softened strut-and-tie model suggests a more rational calculation method for the effective compressive strength and the height of the joint concrete based on the simplified softened strut-and-tie. The shear strength of existing tested 15 sandwich interior joints is calculated by using the modified simplified softened strut-and-tie model. Furthermore, the theory results are compared with those of the code method and those of the simplified softened strut-and-tie model. Results and Conclusion: The results indicate that the code method is more conservative, and the modified simplified softened strut-and-tie can more precisely predict the joint shear strength than that of the softened strut-and-tie model and more secure than that of the code method. Thus, the modified simplified softened strut-and-tie model can reasonable reveal the failure mechanism of RC beam-column sandwich interior joints.

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