Damage Model Test of Prestressed T-Beam Under Explosion Load

Han Guozhen,Yang Zan,Yan Bo

doi:10.1109/access.2019.2940037

Han Guozhen, Yang Zan + Show 1 more

Open Access

https://doi.org/10.1109/access.2019.2940037

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Abstract

Bridge is an important infrastructure in road traffic, which may bear the accidental load of terrorist attacks and transportation accidents and explosions in its life cycle. In this paper, three groups of prestressed T-beam model tests were carried out in response to the terrorist explosion on the bridge deck. The results show that with the increase of explosive equivalent, the failure degree of prestressed steel reinforcement is aggravated, the number of anchorage falling off is increased, and the normal steel reinforcement evolved from failure to fracture. The fracture shape of the web of prestressed T-beam was “X”, and the failure form on both sides of the web was roughly “I” shape. The number of concrete cracks increased, and the crack depth and the size of the crack increased. The local failure mode of T-beam evolved from seismic collapse to penetrating failure, and the residual bearing capacity of prestressed T-beam gradually decreased.

Highlights

As the throat of the transportation network, bridge plays a significant role in the national economy status and belongs to the third level of the five rings theory: infrastructure construction
Because PRC-T beam belongs to the typical bridge target, conducting study about dynamic response of the blast loadings is practically valuable for engineering application
REINFORCEMENT FAILURE OF PRC-T BEAMS AND ANALYSIS 1) PRESTRESS LOSS AND FAILURE ANALYSIS OF PRC-T BEAMS Fig.8 shows the mid-span damage mode and failure of reinforcement of three specimens, which consist the bond between prestressed steel bars and concrete in the mid-span and the mid-span deflection

Summary

Introduction

As the throat of the transportation network, bridge plays a significant role in the national economy status and belongs to the third level of the five rings theory: infrastructure construction. By contrastive analyzing of three groups of PRC-T beam on the anchorage falling off, the concrete stripping and the bonding state between concrete and prestressed reinforcement, the result showed that with the increasing of explosive equivalent, the cohesive condition of prestressed reinforcement and concrete was even worse, the external concrete of PRC-T beam loss more, the damaged condition in the mid-span gradually aggravated, upward deflection decreased.

Results

Conclusion