Failure Mechanisms and Parameters of Elastoplastic Deformations of Anchorage in a Damaged Concrete Base under Seismic Loading

Oleg Kabantsev,Mikhail Kovalev

doi:10.3390/buildings12010078

Abstract

The article addresses mechanisms of anchorage failure in a concrete base studied within the framework of physical experiments. The authors investigated the most frequently used types of anchors, such as the cast-in-place and post-installed ones. The anchorages were studied under static and dynamic loading, similar to the seismic type. During the experiments, the post-earthquake condition of a concrete base was simulated. Within the framework of the study, the authors modified the values of such parameters, such as the anchor embedment depth, anchor steel strength, base concrete class, and base crack width. As a result of the experimental studies, the authors identified all possible failure mechanisms for versatile types of anchorages, including steel and concrete cone failures, anchor slippage at the interface with the base concrete (two types of failure mechanisms were identified), as well as the failure involving the slippage of the adhesive composition at the interface with the concrete of the anchor embedment area. The data obtained by the authors encompasses total displacements in the elastic and plastic phases of deformation, values of the bearing capacity for each type of anchorage, values of the bearing capacity reduction, and displacements following multi-cyclic loading compared to static loading. As a result of the research, the authors identified two types of patterns that anchorages follow approaching the limit state: elastic-brittle and elastoplastic mechanisms. The findings of the experimental research allowed the authors to determine the plasticity coefficients for the studied types of anchors and different failure mechanisms. The research findings can be used to justify seismic load reduction factors to be further used in the seismic design of anchorages.

Highlights

IntroductionThe findings of the experimental research allowed the authors to determine the plasticity coefficients for the studied types of anchors and different failure mechanisms
Reinforced Concrete and Masonry Structures Department, National Research Moscow State University of Scientific and Research Institute of Experimental Mechanics, National Research Moscow State University of
The results of the study demonstrate four failure mechanisms of anchors embedded in a concrete base that has a crack: the anchor material failure (Figure 8a), the base concrete failure (Figure 8b), the slippage at the interface between the anchor and the concrete base (Figure 8c), and the failure at the interface between the adhesive composition and the concrete base (Figure 8d)

Summary

Introduction

The findings of the experimental research allowed the authors to determine the plasticity coefficients for the studied types of anchors and different failure mechanisms. 1. Introduction with regard to jurisdictional claims in Buildings in earthquake-prone areas are substantially different from those in less seismically active regions. Introduction with regard to jurisdictional claims in Buildings in earthquake-prone areas are substantially different from those in less seismically active regions Their most important distinctive features include the ability to absorb seismic impacts (some of which are very strong in certain cases), their addition to regular loads, and the ability to maintain the pre-set bearing capacity. The value of the plasticity coefficient is identified using various methods [3,4,5,6,7,8,9], based on versatile parameters, such as the curvature of a reinforced concrete section, the plastic rotation angle of a reinforced concrete section, accumulation of damages, reduction of stiffness, among others

Methods

Results

Conclusion