Seismic Behavior Analysis of Damaged Steel Fiber-Reinforced High-Strength Concrete Frame Joints Strengthened by FRP

Wang Tingyan,Zhang Junwei,Zhou Yun

doi:10.1155/2020/8836516

Wang Tingyan, Zhang Junwei + Show 1 more

Open Access

https://doi.org/10.1155/2020/8836516

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Abstract

In this paper, the seismic behavior of fiber-reinforced polymer (FRP) strengthened and unstrengthened steel fiber-reinforced high-strength concrete frame joints under low cyclic loading was tested. Then, the nonlinear finite element program was used to simulate the seismic behavior of FRP strengthened and unstrengthened steel fiber-reinforced high-strength concrete frame joints under low cyclic repeated load. The influence of FRP bond direction on the seismic behavior of steel fiber-reinforced high-strength concrete frame joints was studied. Through the comparison of the test values and numerical simulation values of the hysteretic curve, skeleton curve, energy dissipation capacity, displacement ductility, bearing capacity degradation, stiffness degradation, and other performance indexes of frame joints, the rule was obtained. The results showed that the 45° bonding direction of carbon fiber cloth is better than the 0° bonding direction, and the digital simulation results are in good agreement with the test results. Therefore, the constitutive model, element, end constraint, and loading method used in the finite element numerical simulation of this paper were reasonable, which can provide reference for the similar research in the future.

Highlights

IntroductionA node is the pivot of transferring and distributing internal force and plays an important role in the whole structure without collapse
Frame joint is an important and key part of frame structure
In the high-strength concrete structure, the interface bonding performance between the high-strength concrete and the steel fiber is better, and the steel fiber distribution in the high-strength concrete can play a more active role. erefore, adding steel fiber into high-strength concrete frame joints is an effective measure to improve the mechanical properties of frame joints, improve the reinforcement crowding, and reduce the construction difficulty. erefore, adding steel fiber into the joints of high-strength concrete frame should play a positive role in improving the seismic performance of the joints [4, 5]

Summary

Introduction

A node is the pivot of transferring and distributing internal force and plays an important role in the whole structure without collapse. Many earthquake disasters at home and abroad show that, under the action of earthquake, the joint area is still the most vulnerable part of the high-strength concrete frame structure, and its damage often leads to the collapse of the whole building structure [1]. Erefore, adding steel fiber into high-strength concrete frame joints is an effective measure to improve the mechanical properties of frame joints, improve the reinforcement crowding, and reduce the construction difficulty. Erefore, adding steel fiber into the joints of high-strength concrete frame should play a positive role in improving the seismic performance of the joints [4, 5] In the high-strength concrete structure, the interface bonding performance between the high-strength concrete and the steel fiber is better, and the steel fiber distribution in the high-strength concrete can play a more active role. erefore, adding steel fiber into high-strength concrete frame joints is an effective measure to improve the mechanical properties of frame joints, improve the reinforcement crowding, and reduce the construction difficulty. erefore, adding steel fiber into the joints of high-strength concrete frame should play a positive role in improving the seismic performance of the joints [4, 5]

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Results

Conclusion