Effects of Corrosion on Compressive Arch Action and Catenary Action of RC Frames to Resist Progressive Collapse Based on Numerical Analysis.

Lu Zhang,Xiaofang Deng,Tingyu Wei,Jian Zeng,Hongyu Li

doi:10.3390/ma14102662

Lu Zhang, Xiaofang Deng + Show 3 more

Open Access

https://doi.org/10.3390/ma14102662

Copy DOI

Abstract

Many negative factors can influence the progressive collapse resistance of reinforced concrete (RC) frame structures. One of the most important factors is the corrosion of rebar within the structure. With increasing severity of corrosion, the duration, robustness, and mechanical performance can be greatly impaired. One specific side effect of rebar corrosion is the significant loss of protection against progressive collapse. In order to quantify the effects of rebar corrosion on load-resisting mechanisms (compressive arch action (CAA) and tensile catenary action (TCA)) of RC frames, a series of numerical investigations were carried out in this paper. The previous experimental results reported in the literature provide a benchmark for progressive collapse behavior as a sound condition and validate the proposed numerical model. Furthermore, based on the verified numerical model, the CAA and TCA with increasing corrosion and an elapsed time from 0 to 70 years are investigated. Comparing with the conventional empirical model, the proposed numerical model has shown the ability and feasibility in predicting the collapse resistance capacity in structures with corroded rebar. Therefore, this numerical modeling strategy provides comprehensive insights into the change of load-resisting mechanisms in these structures, which can be beneficial for optimizing the design.

Highlights

Progressive collapse is a procedure where a primary structural component fails, leading to the failure of the adjoining structural system due to the damage or failure of a vertical load-resisting component such as column, or wall; eventually, the disproportionate collapse or total collapse of the building happens
This paper proposed to understand the characteristics of compressive arch action (CAA) and TCA during the collapse based on the numerical model
The experimental results from our group’s previous works [23] are to build the benchmark, which can be used for characterizing the behaviors of progressive collapse without corrosion

Summary

Introduction

Progressive collapse is a procedure where a primary structural component fails, leading to the failure of the adjoining structural system due to the damage or failure of a vertical load-resisting component such as column, or wall; eventually, the disproportionate collapse or total collapse of the building happens. Some unexpected events may still cause one or more load-bearing members to fail This is especially important for columns, since the self-weight or any other loading will be transferred to the ground through these members. A department store building collapsed in Sampoong, Korea, in 1995 because a supporting column on the fifth floor lost most of its bearing capacity due to poor construction quality control [2]. From these events, the load-resisting mechanisms of RC frames due to failure in columns certainly warrant the attention of researchers

Methods

Results

Discussion

Conclusion