Earthquake‐Induced Domino‐Type Progressive Collapse in Regular, Semiregular, and Irregular Bridges

Seyedkhoei, Amir; Akbari, Ramin; Maalek, Shahrokh

doi:10.1155/2019/8348596

Cited by 11 publications

(4 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Slope blasting uses pre-split controlled blasting; it can protect the retained rock mass to a certain degree, but the rock mass will still be damaged to a certain extent [ 14 ]. According to the effect of explosives, there is a crushed zone, a fractured zone and a vibrated zone in order from the blast hole outward.…”

Section: Analysis On the Deformation Mechanism Of The Shallow Layer O...mentioning

confidence: 99%

Shallow Failure of Weak Slopes in Bayan Obo West Mine

Wang

Yan

Qu³

et al. 2022

IJERPH

View full text Add to dashboard Cite

The slope stability of large open-pit mines has always been a concern and the analysis of large-scale slope landslides is a focus. However, shallow failure in soft rock slopes also has a serious impact on safe production. The northern slope of Baiyunebo West Mine has many shallow landslides in the final slope, resulting in damage of the maintenance channel of the belt transportation system, which has a serious impact on the safety of production. In order to reduce the shallow failure in weak rock slope, it is necessary to analyze the behavior and characteristics of shallow failure in weak rock. Firstly, the mechanical parameters of the intact rock were obtained by using the exploration data; secondly, through the analysis of blasting-damage range, the distribution characteristics of fractures after the failure of weak rock were obtained. Finally, through theoretical analysis, numerical simulation, surface displacement monitoring and on-site shallow-failure case analysis, the deformation and characteristics of shallow failure of weak rock slope in West Mine were obtained. It was found that the mechanical parameters of rock mass strength on the surface of weak rock slope and the original rock were quite different after mining disturbance. The mode of failure of shallow weak rock slope in the West Mine was creep-cracking; the numerical modelling analysis was carried out by using the assignment method of shallow lithology weakening and gradual change, which is more in line with the deformation characteristics of weak rock slope in West Mine. The lower deformation of the soft rock slope in West Mine is 3–5 times that of the upper deformation. The research results are helpful to understand the influence of blasting on the stability of soft rock slope. At present, West Mine has started to adjust blasting parameters according to the research results, so as to reduce the excessive damage of blasting to rock mass, so the stability of the slope is improved.

show abstract

Section: Analysis On the Deformation Mechanism Of The Shallow Layer O...mentioning

confidence: 99%

Shallow Failure of Weak Slopes in Bayan Obo West Mine

Wang

Yan

Qu³

et al. 2022

IJERPH

View full text Add to dashboard Cite

show abstract

“…e used earthquake ground motion was artificial; it followed the work of Guedes [8]. Also, the mentioned artificial ground motion is previously used by Chiara and Rui [19], Lau and Wibowo [20], and Seyedkhoei et al [21]. e peak ground acceleration (PGA) was 1.05 g. Based on the estimated bridge design capacity, the PGA is increased by 1.2. e total time used for the analysis from the artificial earthquake record is 4 seconds, and it is applied in the transverse direction (Figure 7).…”

Section: Artificial Earthquake Ground Accelerationmentioning

confidence: 99%

Progressive Collapse of RC Box Girder Bridges due to Seismic Actions

Mohamed

Husain

Aboraya

2020

Advances in Civil Engineering

View full text Add to dashboard Cite

Most of the recent studies focus on the progressive collapse of ordinary structures due to gravity and blast loads. A few focus on studying progressive collapse due to seismic actions, especially of bridge structures. The past major earthquakes have shown that it is possible to develop improved earthquake-resistant design techniques for new bridges if the process of damage from initial failure to ultimate collapse and its effects on structural failure mechanisms could be analyzed and monitored. This paper presents a simulation and analysis of bridge progressive collapse behavior during seismic actions using the Applied Element Method (AEM) which can take into account the separation of structural components resulted from fracture failure and falling debris contact or impact forces. Simple, continuous, and monolithic bridges’ superstructures were numerically analyzed under the influence of the severe ground motions not considering the live loads. The parameters studied were the superstructure redundancy and the effect of severe ground motion such as Kobe, Chi-Chi, and Northridge ground motions on different bridge structural systems. The effect of reducing the reinforcement ratio on the collapse behavior of RC box girders and the variation of columns height were also studied. The results showed that monolithic bridge models with reduced reinforcement to the minimum reinforcement according to ECP 203/2018 showed a collapse behavior under the effect of severe seismic ground motions. However, changing the bridge structural system from monolithic to continuous or simple on bearing bridge models could prevent the bridge models from collapse.

show abstract

“…Curved bridges with subtended angles greater than certain limits are considered irregular bridges in bridge design codes [3,4]. It has been shown in the past that irregular bridges are more vulnerable to seismic excitations compared to regular bridges [5][6][7][8][9][10][11]. Experience with past earthquakes proved that this class of bridges is more vulnerable to seismic excitations than that of bridges with straight and skewed typologies.…”

Section: Introductionmentioning

confidence: 99%

Influence of Abutment Stiffness and Strength on the Seismic Response of Horizontally Curved RC Bridges in Comparison with Equivalent Straight Bridges at Different Seismic Intensity Levels

Heydarpour

Tehrani

2022

Shock and Vibration

View full text Add to dashboard Cite

Seismic design codes have imposed some limitations on the maximum subtended angle of curved bridges and allow engineers to analyze and design them using an equivalent straight bridge. This paper investigates these limitations and evaluates the AASHTO code recommendations regarding the prediction of the seismic responses of curved bridges using an equivalent straight bridge for bridges with different abutment properties at different seismic hazard levels. In this regard, the seismic responses of 21 horizontally curved and straight RC four-span bridges with different abutment types are investigated. In 7 bridge models, soil-abutment-bridge interaction is neglected, while in the rest of the bridge models, the seat-type abutments with the participation of the nonlinear backfill soil, gap, and abutment piles are used in structural modeling. First, nonlinear static (pushover) analyses are carried out to evaluate the overall behavior of the bridges with different abutment configurations in the two perpendicular principal directions. Subsequently, nonlinear time history analyses are performed to predict the seismic response of bridge elements, including column drifts and deck displacements at the place of the abutments in the radial and tangential directions at different seismic intensity levels, including the design basis earthquake (DBE) and maximum credible earthquake (MCE) excitation levels. In addition, the actual maximum displacements of the components of the bridges (i.e., the total absolute displacements) were also predicted and evaluated for different cases. It was found that the abutment properties and boundary conditions had a significant effect on the seismic response assessment of curved bridges compared to straight bridges, while such parameters are not currently considered by the design codes. The results also indicated that by increasing the seismic intensity level, more limitations should be imposed on the use of the equivalent straight bridges.

show abstract

Earthquake‐Induced Domino‐Type Progressive Collapse in Regular, Semiregular, and Irregular Bridges

Cited by 11 publications

References 21 publications

Shallow Failure of Weak Slopes in Bayan Obo West Mine

Shallow Failure of Weak Slopes in Bayan Obo West Mine

Progressive Collapse of RC Box Girder Bridges due to Seismic Actions

Influence of Abutment Stiffness and Strength on the Seismic Response of Horizontally Curved RC Bridges in Comparison with Equivalent Straight Bridges at Different Seismic Intensity Levels

Contact Info

Product

Resources

About