Experimental study on dynamic damage evolution of concrete under multi-axial stresses

Chen, J.Y.; Zhang, Z.X.; Dong, Haiwei; Zhu, Jie

doi:10.1016/j.engfailanal.2011.04.006

Cited by 20 publications

(15 citation statements)

References 7 publications

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“…proposed index and that of Yu et al [35] both show a damage index of zero while Chen et al [37] and Amaziane and Dubé [38] models produce damage indices of 0.06 and 0.08, respectively. Figure 4-19b represents the damage of concrete at its maximum stress.…”

Section: Validation Of the Proposed Model For Concretementioning

confidence: 99%

“…Figure 4-19b represents the damage of concrete at its maximum stress. The Yu et al [35] model generates a damage index of zero and the proposed model gives a damage index varying from 0.01 to 0.06 while the other two models produce very large damage indices (0.33 for Chen et al [37] model and around 0.45 for the Amaziane and Dubé [38] model). Figure 4-19c represents the damage indices at the stress dropped by 15% which is also the damage index that Yu et al [35] model gives.…”

Section: Validation Of the Proposed Model For Concretementioning

confidence: 99%

“…Chen et al [37] defined the damage of concrete as the ratio of modulus loss to the initial modulus of elasticity defined by…”

Section: Damage Models For Concretementioning

confidence: 99%

“…The proposed damage model, together with the models proposed by Yu et al [35], Chen et al [37] and Amziane and Dubé [38], is applied to assess the damage of different concrete with the strengths [96] model is employed to calculate parameters for Yu et al [35], Chen et al [37] and Amziane and Dubé [38] models. proposed index and that of Yu et al [35] both show a damage index of zero while Chen et al [37] and Amaziane and Dubé [38] models produce damage indices of 0.06 and 0.08, respectively.…”

Section: Validation Of the Proposed Model For Concretementioning

confidence: 99%

“…The parameters employed in the damage models for concrete suggested in the past studies such as Yu et al [35], Soh and Bhalla [36], Chen et al [37], and Amziane and Dubé [38] are stress, stiffness and modulus. Instead of using these parameters, in the latter part of this chapter, the single parameter of "energy" is used.…”

Section: Introductionmentioning

confidence: 99%

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Seismic damage assessment and FRP retrofit of reinforced concrete structures

Cao¹

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Only a small percentage of existing buildings around the world have been designed and constructed based on modern seismic codes. Majority of these buildings were designed and built based on older codes and thus are now identified as potentially hazardous due to more stringent seismic requirements of newer seismic standards. Consequently, these structures are vulnerable to earthquakes as has become evident in the recent earthquake events. Mitigating the seismic hazards for these deficient structures, instead of replacement, has been increasingly looked at by the engineering community due to obvious economic reasons.An important first step towards this mitigation is called "Damage Assessment". Damage Assessment by definition is the evaluation of potential damage in a particular structure in a seismic event. There exist many indices such as drift based on which the extent of potential damage in a building can be described. Choosing the right index and understanding how a particular index would correlate with the seismic parameters or how sensitive it would be to a particular seismic event is quite important. Many structures, for example, are structurally sound under far fault earthquakes but may suffer from extensive damage if a near fault earthquake occurs.While many studies have been undertaken in the past towards methods of analysis that best simulate the damage and on the development of indices that better represent it, the efforts are isolated and in some instances contradictory. The current study thus attempts to address the gaps in the state of the art and presents a coherent and consistent understanding of the issue together with the introduction of a couple of damage mitigation methods.The main achievements of this thesis are as follows:A simplified model for inelastic analysis of RC structures subjected to earthquakes is developed.A new damage model that appropriately assesses the damage of RC structures is proposed. This new damage model is based on the single parameter of energy which naturally overrides and implicitly incorporates a number of parameters such as force, deformation and number of cycles.Damage assessment in RC structures using the new damage model is performed.Correlation between seismic parameters and damage indices of structures is investigated.A new definition for near-fault earthquakes is developed and regions with different damage potential are established.

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Section: Validation Of the Proposed Model For Concretementioning

confidence: 99%

Section: Validation Of the Proposed Model For Concretementioning

confidence: 99%

“…Chen et al [37] defined the damage of concrete as the ratio of modulus loss to the initial modulus of elasticity defined by…”

Section: Damage Models For Concretementioning

confidence: 99%

Section: Validation Of the Proposed Model For Concretementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Seismic damage assessment and FRP retrofit of reinforced concrete structures

Cao¹

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Die zweiaxiale dynamische Druckfestigkeit von Beton

Mosig

Quast

Curbach

2019

Beton und Stahlbetonbau

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Untersucht wurde die Druckfestigkeit von zwei Betonen unter zweiaxialer dynamischer Druckbeanspruchung. Dabei wurde ein zweiaxialer Split‐Hopkinson‐Bar verwendet, welcher die dynamische Beanspruchung in Form zweier senkrecht zueinander verlaufender Belastungswellen auf den Probekörper aufbringt. Zur Referenz wurden die statischen Druckfestigkeiten unter biaxialer Belastung mit verschiedenen Spannungsverhältnissen der beiden Belastungsachsen in einer Triaxialprüfmaschine ermittelt. Die Ergebnisse deuten auf eine teilweise Überlagerung, jedoch keine vollständige Superposition der beiden festigkeitssteigernden Effekte aus mehraxialer Druckbeanspruchung und erhöhter Dehnrate hin. Insbesondere sind deutliche Unterschiede im Bruch‐ und Rissbild bei den unterschiedlichen Belastungsarten zu erkennen.

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