APPLICATION FOR MARKET IMPACT OF STOCK PRICE USING A CUMULATIVE DAMAGE MODEL

As for the slope with fault fracture zone, the fault fracture zone is the main sliding surface, whose shear strength parameter is the main calculation parameter of landslide occurrence. In this paper, shaking table model tests and damage theory were used to study the change of shear strength and mechanical cumulative damage model of fault fracture zone under the blasting vibration cyclic load. At first, the slope of Daye Iron Mine is selected as a case to study the shear strength weakening law of fault fracture zone by the similarity theory and the principle of the orthogonal test, in which the influence of the characteristics of vibration loading on the shear strength parameters of fault fracture zone with different thicknesses was studied. Secondly, by the assumption of Lemaitre strain equivalence and according to the extreme value characteristics of the normal stress-shear stress curve, the damage theory model of the fault fracture zone was reconstructed, and the microelement of fault was selected for analysis and divided into two parts, including damaged and undamaged materials. Finally, the results of the shaking table model tests were compared with the results of the shear cumulative damage model to verify the rationality of the theoretical model. Moreover, the predicted results of the theoretical model can better reflect the degradation trend of the fault fracture zone with the loading amplitude, normal stress, and loading times. It can be used as a reference for slope stability prediction under the action of cumulative static and dynamic loads.

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A Cumulative Damage Model for the Analysis of Steel Frames Under Seismic Actions

Advances in Steel Structures (ICASS '99) ◽

10.1016/b978-008043015-7/50005-1 ◽

1999 ◽

pp. 13-24

Author(s):

Z SHEN

Keyword(s):

Damage Model ◽

Steel Frames ◽

Cumulative Damage ◽

Cumulative Damage Model

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Fatigue-Cumulative Damage Model of RC Crane Girders Strengthened with FRP Strips

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.385-387.165 ◽

2008 ◽

Vol 385-387 ◽

pp. 165-168

Author(s):

Shan Suo Zheng ◽

Bin Wang ◽

Lei Li ◽

Liang Zhang ◽

Pi Ji Hou

Keyword(s):

Damage Mechanics ◽

Flexural Rigidity ◽

Failure Process ◽

Damage Model ◽

Cumulative Damage ◽

Good Time ◽

Failure Patterns ◽

Damage And Fracture ◽

Cumulative Damage Model ◽

Frp Strips

The cumulative damage of the reinforced concrete (RC) crane girders occurred by overload, fatigue and other reasons in service may deteriorate the safety of RC crane girders seriously, so it is necessary to analyze the damage mechanism and rationally reinforce them in good time. In this paper, RC crane girder strengthened with CFRP strips is taken as a target, and the mechanical performance degradation under fatigue load is studied. According to the basic theory of continuum damage mechanics, a damage variable is defined by flexural rigidity, and fatigue- cumulative damage model, which describes the process of damage and fracture, is established. The variation law of cumulative damage of RC crane girders strengthened with FRP strips under crane load is discussed, and the failure patterns such as concrete cracking, debonding between CFRP strips and concrete, yield of steel bars etc., are studied. The criterion which can be used to estimate the cumulative damage degree of strengthened RC crane girders is proposed. Finally, the evolution of the fatigue damage in the RC crane girders strengthened with CFRP strips is numerically simulated, and the results show that the proposed model can correctly describe the damage and failure process of strengthened RC crane girders. The research will provide a reference for the damage analysis and reinforcement of RC crane girders strengthened with CFRP strips.

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