The Impact of Degradation on MSW Shear Strength

2008 ◽  
Author(s):  
Edward Kavazanjian, Jr.
Keyword(s):  
Shear Strength ◽  
The Impact

scholarly journals Experimental and Numerical Study on Ultimate Shear Load Carrying Capacity of Corroded RC Beams

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Zhanzhan Tang ◽  
Zhixiang He ◽  
Zheng Chen ◽  
Lingkun Chen ◽  
Hanyang Xue ◽  
...  
Keyword(s):  
Shear Strength ◽  
Bearing Capacity ◽  
Cross Section ◽  
Loss Rate ◽  
Numerical Study ◽  
Rc Beams ◽  
Load Carrying ◽  
Shear Bearing Capacity ◽  
The Cross ◽  
The Impact

For an RC beam, the strength of steel rebar, the bonding strength between the concrete and reinforcement, and the bite action between the aggregates will deteriorate significantly due to corrosion. In the present study, 10 RC beams were designed to study the impact of corrosion on the shear bearing capacity. The mechanism of corrosion for stirrups and longitudinal bars and their effects were analyzed. Based on the existing experimental data, the correlation between the stirrup corrosion factor and the cross section loss rate was obtained. An effective prediction formula on the shear bearing capacity of the corroded RC beams was proposed and validated by the experimental results. Moreover, a numerical analysis approach based on the FE technique was proposed for the prediction of the shear strength. The results show that corrosion of the reinforcements could reduce the shear strength of the RC beams. The corrosion of stirrups can be numerically simulated by the reduction of the cross section. The formulae in the literature are conservative and the predictions are very dispersed, while the predictions by the proposed formula agree very well with the experiment results.

scholarly journals Wetland shear strength with emphasis on the impact of nutrients, sediments, and sea level rise

2019 ◽  
Vol 229 ◽  
pp. 106394 ◽  
Author(s):  
Navid H. Jafari ◽  
Brian D. Harris ◽  
Jack A. Cadigan ◽  
John W. Day ◽  
Charles E. Sasser ◽  
...  
Keyword(s):  
Shear Strength ◽  
Sea Level Rise ◽  
Sea Level ◽  
The Impact ◽  
And Sea Level

scholarly journals The Impact of surface perturbations on snow-slope stability

1998 ◽  
Vol 26 ◽  
pp. 307-312 ◽  
Author(s):  
H. Conway
Keyword(s):  
Shear Stress ◽  
Shear Strength ◽  
Slope Stability ◽  
Crack Growth ◽  
Basal Layer ◽  
Field Measurements ◽  
Critical Crack ◽  
Small Surface ◽  
Weak Layer ◽  
The Impact

Measurements and observations by others indicate that a potential slab avalanche consists of a relatively cohesive slab of snow overlying a thin weak layer that coniains flaws where locally the shear stress from the overburden is not fully supported. Under favorable conditions, snow will shear strain-soften, which provides the basis for applying a slip-weakening model to examine the size of flaw needed to initiate sub-critical crack propagation along the weak layer. Using typical values for snow properties, the model predicts sub-critical crack growth can initiate from a relatively small flaw well before the shear stress from the overburden approaches the peak shear strength at tin-bed. The occurrence of small flaws or imperfections in the basal layer would explain field measurements which usually indicate that avalanching occurs before the applied shear stress exceeds the shear strength at the basal layer.Widespread slab-avalanche activity often increases significantly soon after the onset of rain on new snow. Measurements of temperature and mechanical properties show that only the upper 0.15 m or less of the slab has been altered at the time of avalanching; alterations at the sliding layer have not yet been detected. Results from the slip-weakening model indicate that the rain-induced alterations would reduce the size of flaw needed to initiate sub-critical crack growth by 10–20%. The observations and model results show clearly the importance of the slab properties; it is evident that both the slab and the weak layer act together to control slope stability. A further implication is that the stability of freshly deposited snow is often close to critical, because a relatively small surface perturbation is often sufficient to cause avalanching. This is not surprising, because it is well known from field observations that new snow on slopes should be treated with caution.

Experimental Study on Mechanical Property of Steel Reinforced Concrete Short Columns of T-Shaped

2007 ◽  
Vol 340-341 ◽  
pp. 1121-1126
Author(s):  
Zhe Li ◽  
Xiao Feng Zhang ◽  
Yan Feng Zhao ◽  
De Fa Wang
Keyword(s):  
Shear Strength ◽  
Mechanical Performance ◽  
Pressure Ratio ◽  
Large Degree ◽  
Seismic Intensity ◽  
Axial Pressure ◽  
Displacement Ductility ◽  
Short Columns ◽  
Test Study ◽  
The Impact

The horizontal press performance of column is deteriorated because of special-shaped section. Moreover, because the antiseismic performance of columns is worse, it is only used in regions where seismic intensity is lower. So the main problem is to enhance the ductility. This test study on mechanical performance has been carried out through fourteen SRCTSSC and RCTSSC. The study focuses on the impact of test axial pressure ratio(nt), hooped reinforcement ratio(ρv), shear span ratio(λ) and steel ratio(ρss) to the shear strength and the antiseismic performance of SRCTSSC. It can be concluded that the shear strength of SRCTSSC is increasing with the increasing of nt and ρss , but the degree of increasing is small when nt is a certainty value, and that the shear strength of SRCTSSC is decreasing with increasing of λ; The shear resistance formula of T-shaped column is derived through tests, the calculated results are in correspondence with those of the tests. It also can be concluded that the hysteretic loops of the SRCTSSC are full and the hysteretic behaviors are improved and that the displacement ductility is increasing with increasing of ρv and ρss , but decreasing with the increasing of nt and the degree of variety in high axial pressure ratio is larger than in low axial pressure ratio. If steel bars are added, the shear strength and displacement ductility of SRCTSSC is increased in a large degree, and the capacity of energy dissipation is also enhanced. This test, for applying the special-shape column to higher intensity region, has the certain instructive significance.

scholarly journals The impact of bone mineral density and disc degeneration on shear strength and stiffness of the lumbar spine following laminectomy

2011 ◽  
Vol 21 (3) ◽  
pp. 530-536 ◽  
Author(s):  
Arno Bisschop ◽  
Margriet G. Mullender ◽  
Idsart Kingma ◽  
Timothy U. Jiya ◽  
Albert J. van der Veen ◽  
...  
Keyword(s):  
Bone Mineral Density ◽  
Shear Strength ◽  
Lumbar Spine ◽  
Disc Degeneration ◽  
Bone Mineral ◽  
Mineral Density ◽  
Strength And Stiffness ◽  
The Impact

scholarly journals The Impact of Carbon Nanofibres on the Interfacial Properties of CFRPs Produced with Sized Carbon Fibres

Polymers ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 3457
Author(s):  
Zhenxue Zhang ◽  
Xiaoying Li ◽  
Simon Jestin ◽  
Stefania Termine ◽  
Aikaterini-Flora Trompeta ◽  
...  
Keyword(s):  
Shear Strength ◽  
Interfacial Shear Strength ◽  
Fibre Diameter ◽  
Sheet Thickness ◽  
Interfacial Properties ◽  
Interfacial Shear ◽  
Nanoindentation Test ◽  
Carbon Nanofibres ◽  
The Impact ◽  
Push Out

In this work, different amounts of CNFs were added into a complex formulation to coat the CFs surfaces via sizing in order to enhance the bonding between the fibre and the resin in the CF-reinforced polymer composites. The sized CFs bundles were characterised by SEM and Raman. The nanomechanical properties of the composite materials produced were assessed by the nanoindentation test. The interfacial properties of the fibre and resin were evaluated by a push-out method developed on nanoindentation. The average interfacial shear strength of the fibre/matrix interface could be calculated by the critical load, sheet thickness and fibre diameter. The contact angle measurements and resin spreadability were performed prior to nanoindentation to investigate the wetting properties of the fibre. After the push-out tests, the characterisation via optical microscopy/SEM was carried out to ratify the results. It was found the CFs sizing with CNFs (1 to 10 wt%) could generally increase the interfacial shear strength but it was more cost-effective with a small amount of evenly distributed CNFs on CFs.

scholarly journals Change Mechanism of Strength of Soil-rock Mixture Freezing-thawing Interface under Different Rock

2021 ◽  
Author(s):  
Li Gang ◽  
Huang Tao ◽  
Li Zhen ◽  
Bai Miaomaio
Keyword(s):  
Shear Strength ◽  
Shear Failure ◽  
Laser Scanner ◽  
Shear Plane ◽  
Failure Surface ◽  
Calculation Model ◽  
Bite Force ◽  
Direct Shear Tests ◽  
Change Mechanism ◽  
The Impact

With global warming and accelerated degradation of permafrost, the engineering problems caused by the formation of weak zones between the shallow and permafrost layers of soil–rock mixture (S-RM) slopes in permafrost regions have become increasingly prominent. To explore the influence of rock content on the shear strength of the S-RM freezing–thawing interface, the variation in the shear strength for different rock content is studied herein using direct shear tests. In addition, a 3D laser scanner is used for obtaining the topography of the shear failure surface. Combined with the analysis results of the shear band-particle calculation model, the influence of the rock content on the shear strength of the interface is explored. It was found that the impact threshold of the rock content on the interface strength and failure mode is approximately 30%, when the rock content (R) is > 30% and that the shear strength increases rapidly with increasing rock content. When R ≤ 30%, the actual shear plane is similar to waves; when R > 30%, the shear plane appears as gnawing failure. The shear strength of S-RM freezing–thawing interface mainly comes from the bite force and friction between particles. The main reason for the increase in shear strength with increasing rock content is the increase in bite force between particles, which makes the ratio of bite force to friction force approximately 1:1.

scholarly journals Stability of Soil Cutting and Side Slope Based on Stress Route Theory

2015 ◽  
Vol 2 ◽  
pp. 1
Author(s):  
Zhaohong Ji
Keyword(s):  
Shear Strength ◽  
Slope Stability ◽  
Effective Stress ◽  
Analytical Method ◽  
Soil Slope ◽  
Safety Coefficient ◽  
Side Slope ◽  
Stress Changes ◽  
Soil Cutting ◽  
The Impact

<p>The stress route analytical method compensates for the limitation of traditional soil slope stability analytical method. Since it disregards the impact of effective stress route on the stress status and anti-shear strength of soil slope, it maps out the soil stress route drawing in the excavation process, and marks the anti-shear strength and shear stress changes under various conditions of soil. It causes the changes of the safety coefficient rules in the excavation of soil slope and affects the excavation stability of soil cutting and side slope. The result reveals: (1) The main analytical method of side slope stability which covers both the limit balance method and finite unit method fails to consider the impact of effective stress route on the existing stress status and anti-shear strength of soil slope; the stress route analytical method is able to overcome this limitation to a certain degree. (2) The stress route theory is adopted for analysis, in which, it can projected the whole stress of typical and most dangerous area of the slope, able to analyse the anti-shear strength of soil in a real-time manner, manage to express the safety coefficient changes in the stress route drawing and provides a selection of a suitable excavation plan by contrast. (3) In the overall excavation, the slope toe suffers from obvious stress concentration which expands to the surrounding areas and inconvenient for the side slope stability in the excavation.</p>

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