The centrifuge model tests indicate that two failure types of soil slope are relevant to different water content, i.e.tensile crack failure occurs under low water content, in contrast, whole failure occurs.
Glass fibre reinforced plastic of epoxy resin has excellent anticorrosive ability, but the strength and brittleness are low and it is easy to be broken.
Based on the analysis of the crack in 0# and 1# abutment of the lower reaches part in Jingkou Bridge, this paper put up some countermeasures that start with upper bridge.
The limitation of conventional test with small samples was overcome,and the correspondence was built between original osmotic pressure and maximum destruction pressure during crack extension of coal sample. The mechanical mechanism of destructing coal mass structure by hydraulic crack is studied,and the scientific basis is provided for behavior control of crack development induced by hydraulic fracturing in coal-rock medium.
Design optimization of layered plate bonding process is conducted by considering uncertainties in a manufacturing process, to reduce the crack failure arising due to the difference of thermal expansion coefficients of the adherents.
Moreover, the results are used to identify locations of possible crack failure and to derive a fracture criterion for crack initiation at the local level.
In general, high carbide area fractions promote coalescence-dominated fatigue crack failure, while low area fractions promote propagation-dominated fatigue crack failure.
A significant aspect of the theory is the introduction of a crack damage state variable which quantifies submicroscopic crack damage prior to macroscopic failure of the material.
A first order differential equation governing the time evolution of the crack damage variable is developed based on first principles of statistical physics.
We have used the complex electrical data to produce a direction-sensitive (anisotropic) crack damage parameter, and used it to calculate the effective Young's modulus by employing the models of Walsh and Bruner.
Hypothesis tests are builtupon the (conditional) probability density function of crack damage that does not requirethe solution of stochastic differential equations in either Wiener integral or It? integralsettings.
Horizontal earthquake load has been generally assumed as the decisive role in damaging structures. According to our field investigation of damage to chimneys, it is shown that this traditional idea is not correct and the vertical seismic load does play the major role in the damage. Besides, the damage mechanism of multiple peripheral cracks on brick chimneys is described. Based on literature [1], both the maximum value of the horizontal seismic load and the minimum value of the vertical seismic load are com...
This paper provides the investigation results of the durability and the defects occuring in 70 mass concrete constructions in china. The defects of mass conrete gates and dams are summarized as follows: 1. crack damage; 2. leakage and leaching corrosion; 3. freeze-thaw erosion; 4. scouring and wearing; 5. reinforcement corrosion; 6. corrosion of surrounding water. All these defects are illustrated by typical constructions. For improving the durability of hydraulic concrete structures, some useful recommenda...
Through the experiments of 4 1/3 scale waffle slab models subjected to short-term service load and ultimate load, the structural behavior of prestressed concrete waffle slab floor with composite reinforcement (deflections, cracks, failure modes and ultimate stress states of unbonded tendons) at different loading stages have been investigated. The experimental data have been used to checkthe accuracy of the program PFG-1993[13] and the improved equation for predicting the stress in unbonded prestressing te...
裂缝破坏
crack failure
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