Seismic behavior and cross-scale refinement model of damage evolution for RC shear walls

Dong, Yao‐Rong; Xu, Zhao‐Dong; Zeng, Kai; Cheng, Yu; Xu, Chunxiang

doi:10.1016/j.engstruct.2018.03.096

Cited by 35 publications

(14 citation statements)

References 22 publications

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“…Although present simulation did not achieve good agreement with experimental behavior by using standard CDP parameters, numerous works do [5,16,17,21,22,23]; most of them varies only the dilation angle, as shown in Table 1.…”

Section: Resultsmentioning

confidence: 58%

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Calibration of Concrete Damaged Plasticity Model parameters for shear walls

2021

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Reinforced concrete structures are relatively complex to analyze, with nonlinear effects like cracking, crushing, steel yielding, aggregate interlock, dowel effect, concrete-rebar interaction and so on. The concrete damaged plasticity CDP model is a consolidated smeared-crack model which accounts for multiaxial behavior with good agreement to experimental results. One particular relevant application which benefits greatly from such feature is the shear wall, as shear stress significantly influences its overall behavior, therefore multiaxial constitutive models and three-dimensional finite elements usage consist in a fitting modeling approach. Reinforced concrete shear walls are structures especially useful for lateral force-resisting systems, as they provide ductility, stiffness and strength. Albeit CDP is widely applied, its parameters are not consensus in the literature, which represents a relevant research gap. The present work considers and compares CDP parameters from relevant literature, in order to calibrate those parameters for the case of reinforced concrete shear walls. To this purpose, four wall experiments related in the bibliography are modeled using solid finite elements for concrete and trusses for rebars using commercial package ABAQUS. All walls are flexure-controlled with aspect ratio greater than 2.0. By varying those parameters and comparing obtained force vs. displacement curves and interesting values attained, like yield lateral force and displacement, stiffness and maximum lateral force, it is settled a set of parameters with acceptable response focusing in the post-peak response based on the lower estimated error of displacement capacity. Those parameters agree reasonably with literature, although it is possible that obtained calibration is restricted to flexure controlled shear walls scope. It is possible that usage of trusses to represent reinforcement does not consider dowel effect, so a suggestion for future studies is to change trusses for elements with transverse stiffness, like beams or solids.

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Section: Resultsmentioning

confidence: 58%

“…The steel rebars are modeled as truss elements (T3D2) embedded in the concrete solid elements (C3D4). The modeling approach considering trusses embedded on solids is quite common for reinforced concrete analysis [14,16,17,21,23]. Figure 5 illustrates applied finite elements.…”

Section: Methodsmentioning

confidence: 99%

Calibration of Concrete Damaged Plasticity Model parameters for shear walls

2021

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“…The concrete damage plasticity (CDP) model built in ABAQUS is adopted in this study, which employs concepts of isotropic damaged elasticity in combination with isotropic tensile and compressive plasticity to represent the inelastic behavior of concrete. The CDP model is capable of simulating loading cases of concrete subjected to monotonic, cyclic, and/or dynamic loading under low confining pressures [ 36 ]. In the cases of uniaxial tension and compression, assumptions are made that the two main failure mechanisms are tensile cracking and compressive crushing of concrete, as shown in Figure 8 [ 37 ].…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

Damage Evolution of RC Beams Under Simultaneous Reinforcement Corrosion and Sustained Load

Shen

Gao

et al. 2019

Materials

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To accurately obtain the performance of concrete structures in coastal regions, it is necessary to correctly understand the damage evolution law of reinforced concrete (RC) members under real working conditions. In this paper, four RC beams, subjected to different levels of corrosion and sustained load, are first tested. Reinforcement corrosion coupled with sustained load increases the number and width of cracks at the soffit of beams but decreases their loading capacities. Crack width of the corroded beam under 50% of designed load is two times of that under 30% of designed load. Residual loading capacities of the corroded beams subjected to 30% and 50% of designed load are 87.5% and 81.8% of the control beam. A finite element model is developed for the corroded RC beams. Due to less confinement, concrete below and at the sides of reinforcements is subjected to a higher stress, compared to concrete above the reinforcements. Corrosion expansion of reinforcements is successfully modelled by a temperature-filed method, as it properly simulates the damage evolution of the corroded RC beams. As a result, concrete cracking, caused by the reinforcement corrosion, is well captured. Coupling reinforcement corrosion with sustained load significantly increases the damage level in RC beams, particularly for those subjected to a high sustained load. The whole damage evolution process of concrete cracking due to corrosion expansion under the coupling effect of sustained loading and environment can be simulated, thus providing a reference for the durability evaluation, life prediction, and numerical simulation of concrete structure.

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“…The classic concrete damage plasticity model from the current code is employed for the constitutive relationship of concrete 40 . The tri‐linear stress–strain model is employed for the constitutive relationship of steel 41 . The elements of C3D8R and T3D2 are used to model the concrete and steel of frame structures separately, and the embedded command is used for degree‐of‐freedom coupling.…”

Section: Numerical Investigations On Seismic Upgraded Rc Frames By Vhbdmentioning

confidence: 99%

Design parameters and material‐scale damage evolution of seismic upgraded RC frames by viscoelastic haunch bracing‐dampers

Dong

et al. 2020

Earthq Engng Struct Dyn

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To improve the seismic design of reinforced concrete (RC) frame structures and upgrade existing RC frame structures that have insufficient seismic design, a new suitable seismic upgraded solution, the installation of viscoelastic haunch bracing‐dampers (VHBD) to increase the seismic performance of RC frames, is proposed in this paper. For a comprehensive and systematical research about this new upgraded frames system, a comparative study on the seismic performance between 15 RC frame structure specimens by adding the VHBD with different design parameters and one common RC frame structure specimen is performed under sinusoidal dynamic loading. The specific items of seismic performance mainly include hysteresis performance, load‐bearing capacity, stiffness degradation, energy dissipation capacity, and additional damping ratio, and so on. First, on the basic of this, the material‐scale damage evolution of structure specimens at each stage is qualitatively analyzed. Then, six reasonable material‐scale damage indexes that can describe the damage evolution of the structures precisely are proposed. Finally, a quantitative comparative analysis on the material‐scale damage evolution of structure specimens in the whole process is carried out under different design parameters. The research results indicate that the upgraded scheme (reasonable design parameters of λ and θ) proposed in this study can improve the seismic performance of RC frame structures to the appropriate level required for the design, in terms of load‐bearing capacity, stiffness, energy dissipation capacity, and damping ratio. At the same time, the failure mode of the structures can be well controlled. The occurred damage at beam‐column joints is reasonably transferred to the beam area, which can guarantee the seismic design requirements of “strong joints and weak components.”

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Seismic behavior and cross-scale refinement model of damage evolution for RC shear walls

Cited by 35 publications

References 22 publications

Calibration of Concrete Damaged Plasticity Model parameters for shear walls

Calibration of Concrete Damaged Plasticity Model parameters for shear walls

Damage Evolution of RC Beams Under Simultaneous Reinforcement Corrosion and Sustained Load

Design parameters and material‐scale damage evolution of seismic upgraded RC frames by viscoelastic haunch bracing‐dampers

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