A new numerical approach in the seismic failure analysis of concrete gravity dams using extended finite element method

Haghani, Majid; Neya, Bahram Navayi; Ahmadi, Mohammad Taghi; Amiri, Javad Vaseghi

doi:10.1016/j.engfailanal.2021.105835

Cited by 10 publications

(3 citation statements)

References 32 publications

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“…Tie constraints in the ABAQUS software are used to define the connection between the anchor and the pile, so that the anchor head and the pile have the same degree of freedom at the tied nodes. The parameter settings in the model are listed in Table 1, which are based on previous studies [33,46,47]. In the simulations, the piles and anchors were modeled as linear elastic materials, while the soil was modeled by the Mohr-Coulomb failure criterion.…”

Section: Model Descriptionmentioning

confidence: 99%

Research on the Dynamic Response of a Slope Reinforced by a Pile-Anchor Structure under Seismic Loading

Li,

Chu,

Zhang

et al. 2023

Buildings

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In earthquake-prone areas, pile-anchor structures are widely employed for slope reinforcement due to their reliable performance. Current research has primarily focused on static and quasi-static analyses of slopes reinforced by using pile-anchor structures, with limited investigation into their dynamic response. In this work, the finite element method (FEM) is used to study the dynamic behavior of a pile-anchor slope system, and the extended finite element method (XFEM) is used to simulate the progressive failure processes of piles. Three different reinforcement schemes, which include no support, pile support, and pile-anchor support, are considered to examine the performance of the pile-anchor structure. The simulation results suggest that the pile-anchor structure displays a reduction of 39.6% and 40.6% in the maximum shear force and bending moment of the piles, respectively, compared to the pile structure. The XFEM is utilized to model the progressive failure process of the piles subjected to seismic loading. We find that crack initiation in the pile body near the slip surface, for both the pile supported and the pile-anchor supported conditions, occurs when the peak ground acceleration arrives. Crack growth in the piles completes in a very short period, with two distinct increments of crack area observed. The first increment occurs when the peak ground acceleration arrives and is significantly larger than the second increment. Consequently, for the seismic design of piles, it is necessary to strengthen the pile body around slip surfaces. The novelty of this paper is that we realize the simulation of crack initiation and propagation in piles subjected to seismic loading.

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Section: Model Descriptionmentioning

confidence: 99%

Research on the Dynamic Response of a Slope Reinforced by a Pile-Anchor Structure under Seismic Loading

Li,

Chu,

Zhang

et al. 2023

Buildings

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“…Actually, the length of meso-crack propagation is of importance for determining the instability failure of a concrete structure, according to recent four decades of research into concrete fracture behavior [ 2 ]. Unfortunately, the instability failure of the concrete structure, including building, pavement and dam structures, always occurs instantaneously without exhibiting enough information except for the crack length [ 3 , 4 ]. Actually, tracking the length of a crack growing in a concrete structure, especially for plain concrete, is also complicated due to the accuracy of the measuring equipment, as well as the fact that the crack length always increases irregularly without a fixed time rate.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Simulation Study of the Fracture Instability Behavior in Polypropylene Fiber-Reinforced Concrete

Cao

Shi

et al. 2023

Materials

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This study investigated the fracture characteristics of plain concrete and polypropylene fiber-reinforced concrete (PFRC) using pre-notched three-point bending beam tests with the digital speckle correlation method (DSCM). Then, the fracture instability behavior of the two types of beams was simulated in finite elements based on the plastic damage model and the cohesion model, for which the applicability was assessed. Furthermore, the stability of the Big Gang Mountain Dam made from plain concrete or PFRC subjected to the earth-quake loading was simulated with the plastic damage model. The results show that the limiting length of the non-local deformation zone can be used as an indicator of instability damage in a concrete structure. The simulation results of the plastic damage model agreed well with the local deformation in the pre-notched three-point bending beam test obtained from the DSCM. The plastic damage model was found to be capable of describing the residual strength phenomenon, which the cohesive model was not capable of. The damage evolution regions of the PFRC dam are strictly constrained in some regions without the occurrence of the local deformation band across the dam, and PFRC can dramatically reduce the failure risk under earthquake loading. The numerical solution proves that PFRC is an advisable material for avoiding failure in concrete dams.

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“…These approaches are classified into two categories: the first, the family of continuum cracking approaches, includes the smeared crack approach [2][3][4] and the plastic-damage constitutive model [5][6][7][8]. The fracture mechanics approach [9,10] and the extended finite element method (XFEM) [11][12][13][14], which belong to the family of discrete crack approaches, constitute the second category. The continuum crack approaches can introduce an excellent framework to characterise the first damage phase and insert parameters of internal failure to depict the stiffness degradation of solid materials without variating the topology of finite element model.…”

Section: Introductionmentioning

confidence: 99%

Deterministic Seismic Damage Analysis for Concrete Gravity Dams: A Case Study of Oued Fodda Dam

Ouzandja

Berrabah

2023

Acta Mechanica Et Automatica

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One of the major dangers for seismic damage of concrete dams is the propagation of cracks in dam concrete. The present study undertakes a numerical investigation of the seismic damage for Oued Fodda concrete gravity dam, located in the northwest of Algeria, considering the impacts of properties of joints along the dam-foundation rock interface and cross-stream earthquake excitation. Three-dimensional transient analyses for coupled dam-foundation rock system are carried out using Ansys software. The hydrodynamic effect of reservoir fluid is modelled using the added mass approach. The smeared crack approach is utilised to present the seismic damage of dam concrete using the Willam and Warnke failure criterion. The dam-foundation rock interface joints are presented with two ways, adhesive joints and frictional joints. The Drucker–Prager model is considered for dam concrete in nonlinear analyses. Consideration of the study results indicates that the frictional joints model can reduce the seismic response and damage hazard of the dam body to a better extent compared with the adhesive joints model. Furthermore, the application of cross-stream earthquake excitation reveals the significant effect on cracking response of the dam in the two models of joints.

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A new numerical approach in the seismic failure analysis of concrete gravity dams using extended finite element method

Cited by 10 publications

References 32 publications

Research on the Dynamic Response of a Slope Reinforced by a Pile-Anchor Structure under Seismic Loading

Research on the Dynamic Response of a Slope Reinforced by a Pile-Anchor Structure under Seismic Loading

Experimental and Simulation Study of the Fracture Instability Behavior in Polypropylene Fiber-Reinforced Concrete

Deterministic Seismic Damage Analysis for Concrete Gravity Dams: A Case Study of Oued Fodda Dam

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