Tension-stiffening behaviour of reinforced concrete ties of various strength classes

Abstract

A new law of tension-stiffening for reinforced concrete (RC) ties is proposed in the present study. It is based on the test data of 11 experimental programs of RC elements of various strength classes reported in the literature. The experimental programs covered a wide range of characteristics of mechanical and geometrical parameters of specimens such as compressive strength of concrete, reinforcement ratio and diameter of reinforcement bars. By eliminating the effect of shrinkage from the test load-strain diagrams of the ties, a simple model with no dependence on reinforcement ratio could be derived. The proposed tension-stiffening law is compared with the formulation in Eurocode 2. Statistical analysis of strain predictions of RC ties based on Eurocode 2 was conducted. It is found that the Eurocode 2 significantly underestimated strains in the RC ties with the errors reaching 50% for the lightly reinforced members. Nevertheless, when shrinkage effect was accounted for in the test load-strain diagrams, the predictive capability of the Eurocode 2 formulation could be significantly improved.

Long-Term Concrete Shrinkage Influence on the Performance of Reinforced Concrete Structures

“…Abundant research on the topic both in the previous century [ 30 ] and in the current one [ 31 , 32 ] has derived multiple tension stiffening relationships based on different assumptions and testing methodologies [ 33 , 34 , 35 ]. Worth of mention are the ones presented in the Euro Code 2 [ 36 ] (henceforth referred to as EC2) and the CEB-fib Model Code 2010 [ 37 ] (henceforth referred to as MC2010). It should be noted that the deformative response of the former has been found to be particularly stiff, especially for small reinforcement ratios [ 38 ], whereas the latter also overestimates the member stiffness only at advance loading stages [ 39 ].…”

Predicting Crack Spacing of Reinforced Concrete Tension Members Using Strain Compliance Approach With Debonding

“…The key results are summarised in Table 1 where they are compared with the experimental data and the values estimated per Eurocode 2 (CEN, 2004) and Model Code 2010 (FIB, 2013). A tension stiffening model was proposed by Kaklauskas et al (2015) as an alternative of the Eurocode 2 provisions for mean strain calculations, and the corresponding crack spacing calculation results are included in Table 1. Additionally, a simplified crack spacing equation is provided in expression (7), whose calculation results are given in the last column of Table 1 for comparison.…”

Centriškai tempiamųjų armuoto betono elementų įtempių ir deformacijų būvio analizė

“…Disertacijos tema paskelbti 9 straipsniai: 5 -žurnaluose, įtrauktuose į Mokslinės informacijos instituto (Clarivate Analytics, Web of Science) pagrindinį sąrašą (Gribniak et al 2010b(Gribniak et al , 2015b(Gribniak et al , 2016bKaklauskas et al 2012;Jakubovskis et al 2018), 2 -konferencijų straipsnių rinkiniuose, įrašytuose į Mokslinės informacijos instituto (Clarivate Analytics, Proceedings) duomenų bazę (Kaklauskas et al 2013;Rimkus et al 2017), 2 -konferencijų straipsnių rinkiniuose (Gudonis et al 2013; Kaklauskas et al 2015). Disertacijos tema skaityti 4 pranešimai šiose tarptautinėse konferencijose:  2-oji konferencija "Performance-based and Life-cycle Structural Engineering (PLSE 2015)", vykusi 2016 m. gruodžio 9-11 d., Brisbane, Australijoje.…”

“…Prognozių (a posteriori) tikimybinis pasiskirstymas nustatomas pagal sugeneruotų rezultatų rinkinį. Kartu su bendraautoriais skyriaus tematika paskelbti du disertacijos autoriaus straipsniai (Gribniak et al 2015b;Kaklauskas et al 2015).…”

“…Nine scientific publications were issued on the research topic: five articles were published in the journals listed in the Clarivate Analytics, Web of Science database (Gribniak et al 2010(Gribniak et al , 2015(Gribniak et al , 2016Kaklauskas et al 2012;Jakubovskis et al 2018); two publications are included in the Clarivate Analytics, Proceedings database (Kaklauskas et al 2013;Rimkus et al 2017); two articles are published in conference proceedings (Gudonis et al 2013;Kaklauskas et al 2015). Four presentations were made at international conferences.…”