scholarly journals Effect of Various Structural Factors on Shear Strength Degradation after Yielding of RC Members under Cyclic Loads

2020 ◽  
Vol 18 (4) ◽  
pp. 211-226
Author(s):  
Li Fu ◽  
Hikaru Nakamura ◽  
Yoshihito Yamamoto ◽  
Taito Miura
Keyword(s):  
Shear Strength ◽  
Strength Degradation ◽  
Cyclic Loads ◽  
Structural Factors ◽  
Shear Strength Degradation

A Shear Strength Degradation Model for Anisotropic Conductive Adhesive Joints Under Hygrothermal Conditions

2013 ◽  
Vol 135 (4) ◽  
Author(s):  
Bo Tao ◽  
Guanghua Wu ◽  
Zhouping Yin ◽  
Youlun Xiong
Keyword(s):  
Shear Strength ◽  
Experimental Testing ◽  
Theoretical Models ◽  
Strength Degradation ◽  
Conductive Adhesive ◽  
Degradation Model ◽  
Anisotropic Conductive Adhesive ◽  
Degradation Data ◽  
Shear Strength Degradation ◽  
Relationship Of

Hygrothermal environments can degrade anisotropic conductive adhesive (ACA) joints by weakening the shear strength of adhesive interface. In this paper, the shear strength degradation model of ACA joints under hygrothermal conditions was formulated through experimental testing and theoretical modeling. The shear strength degradation data were obtained from different hygrothermal aging tests and the ACA moisture properties were characterized for the corresponding hygrothermal conditions. Theoretical models considering the hygrothermal factors of T (temperature), RH (relative humidity), and t (time), were used to fit the shear strength degradation data. It was found that the inverse exponential law was the best candidate model to predict the degradation data. The shear strength degradation model of ACA joints under hygrothermal conditions was proposed, where the relationship of the S (shear strength) and the hygrothermal factors (T, RH, and t) was expressed in an analytical model. The degradation model was validated by experiments, and the model predictions agreed well with the test results.

Runout simulation of seismic landslides using discontinuous deformation analysis (DDA) with state-dependent shear strength model

2020 ◽  
Vol 57 (8) ◽  
pp. 1183-1196 ◽  
Author(s):  
Ting-kai Nian ◽  
Yan-jun Zhang ◽  
Hao Wu ◽  
Guang-qi Chen ◽  
Lu Zheng
Keyword(s):  
Shear Strength ◽  
Strength Degradation ◽  
Discontinuous Deformation Analysis ◽  
Deformation Analysis ◽  
State Dependent ◽  
Discontinuous Deformation ◽  
Landslide Process ◽  
Global Safety Factor ◽  
Seismic Landslide ◽  
Shear Strength Degradation

The reliable numerical simulation of the landslide process contributes to the establishment of evidence-based disaster mitigation measures in seismically active zones. To achieve this goal, a simple and unified state-dependent shear strength model of discontinuities is presented to describe the shear strength degradation in a seismic landslide process. The proposed model establishes a relationship between the shear strength parameters and the global safety factor of the slope by assuming that the slope instability (or landslide initiation) is accompanied by an instantaneous shear strength degradation of discontinuities. To realize the model numerically, the algorithms for the computation of global safety factor and the modification of shear strength parameters were incorporated into the discontinuous deformation analysis (DDA). Subsequently, the kinematic accuracy of the improved DDA method was validated by comparisons with theoretical solutions for the dynamic sliding of a block on an inclined plane. Numerical simulations of the Daguangbao landslide triggered by the Wenchuan earthquake were performed using the improved DDA method. The results illustrate that the shear strength degradation of discontinuities affect the evolution process, travel distance, and post-failure shape of the seismic landslide significantly.

scholarly journals Shear strength degradation in claystones due to environmental effects

Géotechnique ◽  
2014 ◽  
Vol 64 (6) ◽  
pp. 493-501 ◽  
Author(s):  
J.A. PINEDA ◽  
E. ROMERO ◽  
M. DE GRACIA ◽  
D. SHENG
Keyword(s):  
Shear Strength ◽  
Environmental Effects ◽  
Strength Degradation ◽  
Shear Strength Degradation

scholarly journals Performance of Reinforced Reactive Powder Concrete Beam-Column Joints under Cyclic Loads

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Wenzhong Zheng ◽  
Dehong Wang ◽  
Yanzhong Ju
Keyword(s):  
Shear Strength ◽  
Concrete Beam ◽  
Safety Margin ◽  
Strength Degradation ◽  
Reactive Powder Concrete ◽  
Cyclic Loads ◽  
Failure Characteristics ◽  
Column Joint ◽  
Shear Cracking ◽  
Reactive Powder

An experimental research was carried out to investigate the seismic performance and shear strength of reactive powder concrete interior beam-column joints subjected to reverse cyclic loads. Four beam-column joint specimens were cast and tested in the investigation. The failure characteristics, deformational properties, ductility, and energy dissipation of reinforced reactive powder concrete interior beam-column joints were analyzed in this paper. The shear strength of joints was calculated according to the GB5001-2010 and ACI 318-14. The results shows that reactive powder concrete beam-column joints have a higher shear-cracking strength and shear carrying capacity and strength degradation and rigidity degradation are not notable. Additionally, the use of RPC for beam-column joints can reduce the congestion of stirrups in joints core. The shear force in the RPC joint is mainly carried by the diagonal strut mechanism; the design expression of ACI 318-14 can be used for calculating the shear strength of RPC joints, which has a safety margin of 22%∼38% in this test.

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