# Simple equations for predicting the rotational ductility of fiber-reinforced-polymer strengthened reinforced concrete joints

2020-04-01
Abu Tahnat, Yazan B.
Dwaikat, Mahmud M. S.
Halahla, Abdulsamee M.
Achieving a certain limit of rotational ductility in retrofitted reinforced concrete (R.C) joints is very important in the design of earthquake-resistant structures. Strengthening of R.C joints using wraps of fiber-reinforced polymers (FRP) is a common attractive technique and has an effect on the ductility of such joints. This study focuses on developing simple conceptual equations to predict the ductility of exterior reinforced concrete (R.C) beamcolumn joints as a function of the applied FRP. The equations are derived based on statistical regression through parametric study using results from a high-fidelity finite element model created using ABAQUS. The validated model includes material and geometric nonlinearities, in addition to the use of realistic nonlinear contact behavior between FRP and concrete. The proposed simple equations can be used as an initial conceptual design step for checking the adequacy of R.C beam-column joints in seismic design of R.C buildings. The proposed equations consider FRP, relative column-to-beam inertia, and transverse reinforcement in the beam and joint as the main parameter. This study defines the types of failure based on the ductility, and it develops the equations for ductile and brittle failures for both CFRP-strengthened joints and non-strengthened joints. This research confirms quantitatively the effectiveness of using CFRP to increase the ductility in most cases of the R.C beamcolumn joints. However, contribution of the CFRP is limited for some cases.
STRUCTURES

# Suggestions

 A detailed seismic performance assessment procedure for RC frame buildings Yakut, Ahmet (2005-06-01) A detailed seismic performance assessment procedure has been developed for RC frames with masonry in-fill walls. The procedure is based on member damage functions developed for the primary components: columns, beams and in-fill walls. Investigations carried out to determine the influence of a number of parameters on the damageability of components were combined with experimental data to develop component damage functions expressed in terms of member deformations. The component damage states are combined tak...
 Seismic upgrading of reinforced concrete frames with structural steel elements Özçelik, Ramazan; Binici, Barış; Department of Civil Engineering (2011) This thesis examines the seismic internal retrofitting of existing deficient reinforced concrete (RC) structures by using structural steel members. Both experimental and numerical studies were performed. The strengthening methods utilized with the scope of this work are chevron braces, internal steel frames (ISFs), X-braces and column with shear plate. For this purpose, thirteen strengthened and two as built reference one bay one story portal frame specimens having 1/3 scales were tested under constant grav...
 Modeling Beam-Column Joints in Fragility Assessment of Gravity Load Designed Reinforced Concrete Frames Çelik, Ozan Cem (Informa UK Limited, 2008-3-14) Reinforced concrete (RC) frame structures customarily have been designed in regions of low-to-moderate seismicity with little or no consideration of their seismic resistance. The move toward performance-based seismic engineering requires accurate reliability-based structural analysis models of gravity load designed (GLD) RC frames for predicting their behavior under seismic effects and for developing seismic fragilities that can be used as a basis for risk-informed decision-making. This analytical approach ...
 Understanding the behaviour of modern reinforced concrete beam-column joints towards the development of a simplified structural model Şahutoğlu, Orhan; Ali Şahin, Taşlıgedik; Sustainable Environment and Energy Systems (2022-7) Beam-Column joints in reinforced concrete structures (RC) are important elements that connect beams and columns. For the proper transfer of lateral forces along a continuous load path, the integrity of these joints and sufficient strength are crucial. Modern seismic design philosophies dictate these joints to be designed and reinforced with the required joint shear reinforcements. Extreme principal compression stresses in these joints might cause joint shear failure even when the joints are properly reinfor...
 A Computer vision based method for semi-automated rebar detection and measurement of reinforced concrete columns / Hassan, Muhammad Usman; Kurç, Özgür; Department of Civil Engineering (2014) As-built information of reinforced sections is necessary to ascertain structural characteristics from load carrying capacity, serviceability, structural integrity and adherence to code perspective. The objective of this research is to develop a semi-automated structural information acquisition method that can be used to determine as-built information regarding rebar grids of reinforced concrete columns. The technique involves application of photogrammetry, image processing and computer vision knowledge to o...
Citation Formats
Y. B. Abu Tahnat, M. A. Samaaneh, M. M. S. Dwaikat, and A. M. Halahla, “Simple equations for predicting the rotational ductility of fiber-reinforced-polymer strengthened reinforced concrete joints,” STRUCTURES, pp. 73–86, 2020, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/67784.