Effect of Compressive Strength of Core and Precast Concrete on the Behavior of Column Retrofitted by Precast Segment and FRP Wrapping – A Finite Element Study

Open Access

Year : 2024 | Volume : | : | Page : –
By

Chandini G M

L. Manjunatha

H Sharada Bai

  1. Department of Civil Engineering, Nitte Meenakshi Institute of Technology Karnataka India
  2. Department of Civil Engineering, Nitte Meenakshi Institute of Technology Karnataka India
  3. Department of Civil Engineering, University Visvesvaraya College of Engineering, Bengaluru Karnataka India

Abstract

In the present investigation the effect of compressive strength of core and precast concrete on the behavior of columns retrofitted by attaching precast segments and followed by FRP wrapping through Finite Element Analysis. A rectangular column converted into an elliptical column by attaching precast segment is modeled using ANSYS workbench, A Finite Element Analysis software. A Finite Element Model is developed, considering various structural parameters such as grades of core and pre-cast concrete, number of CFRP layers. The concrete is modeled using Solid 186 element, CFRP is modeled using solid 186 element and reinforcement is modeled using REINF264 element. The interface between the precast segment and core concrete and between precast segment and CFRP is assumed to be fully bonded. The size of the columns considered is 100mm×150mm×900 mm. To simulate the contact between precast segment and FRP wrapping, columns heads of size 300mm×300mm×350mm are considered at the ends of the column. The column is reinforced with 6 bars of 8 mm in the longitudinal direction and 8mm ties at 100mm c/c in the lateral direction having Grade of steel as Fe500. The Finite Element Model developed in the present study is validated by comparing the existing experimental results. A detailed parametric study is carried out by considering the grades of core concrete and precast segments as combination of 20 MPa, 40 MPa and 60 MPa and number of layers of CFRP as 0, 1 and 2 layers. Incremental axial displacement up to failure is ap-plied on the upper column head, corresponding reaction load obtained in the lower column head is considered axial load applied on the column. The failure load is considered as the load corresponding to CFRP wrapping reaching its ultimate strain of 1.5%. The axial displacement of the columns with respect to each incremental load is also obtained. From the Finite Element results it is observed that in case of CFRP wrapped columns as the core concrete grade increases, ultimate load carrying capacity of the column increases. However, the CFRP efficiency of columns with lower core concrete compressive strength is more, as core concrete under more dilation, hence CFRP confinement will be more active and effectively utilized. As the concrete grade of precast segment increases the ultimate load carrying capacity of column increases. Also, the ultimate load carrying capacity of the column increases by increasing the number of layers of CFRP.

Keywords: Rectangular Columns, precast segments, FRP wrapping, Finite Element Modelling, Ansys software, load carrying capacity.

How to cite this article: Chandini G M, L. Manjunatha, H Sharada Bai. Effect of Compressive Strength of Core and Precast Concrete on the Behavior of Column Retrofitted by Precast Segment and FRP Wrapping – A Finite Element Study. Journal of Polymer and Composites. 2024; ():-.
How to cite this URL: Chandini G M, L. Manjunatha, H Sharada Bai. Effect of Compressive Strength of Core and Precast Concrete on the Behavior of Column Retrofitted by Precast Segment and FRP Wrapping – A Finite Element Study. Journal of Polymer and Composites. 2024; ():-. Available from: https://journals.stmjournals.com/jopc/article=2024/view=145834

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Ahead of Print Open Access Original Research
Volume
Received October 28, 2023
Accepted February 16, 2024
Published May 13, 2024