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Analysis and Computation on Structure Mechanism of Continuously Reinforced Concrete Pavement

Author: LiangZhongMin
Tutor: WangChangHeng
School: Hunan University
Course: Road and Railway Engineering
Keywords: CRCP Crack Horizontal load Finite Element Method Load stress Stress intensity factor
CLC: U416.216.2
Type: Master's thesis
Year: 2009
Downloads: 131
Quote: 0
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Abstract


In this paper, the finite element method will continuously reinforced concrete pavement (Continuously Reinforcement Concrete Pavement CRCP) reinforced simplified equivalent multilayer composite structure model for of orthotropic thin layer unit , the establishment of continuously reinforced concrete pavement structure of three-dimensional finite element model , based on the load side of the side of the transverse crack case load stress of continuously reinforced concrete pavement ; CRCP there are some tiny cracks caused due to some reason in the pores of the concrete material itself as well as the construction and maintenance process , and these cracks can easily repeat traffic load under expansion cracks through the bottom and the board caused by the destruction of the pavement structure , so the use of fracture mechanics theory to establish a state - of - the - art three - dimensional singular element of concrete pavement crack , and the introduction of surface effects unit SURF154 for applying horizontal load to calculate the stress intensity factor of the crack tip , pavement crack propagation mechanism . Continuously reinforced concrete pavement in three cases the normal running of the vehicle , normal stop , the emergency brake and overload concrete principal stress and the crack tip stress intensity factors were calculated according to the size of the horizontal coefficient of the pavement structure . This paper analyzes the above three horizontal loads and vertical loads together for continuously reinforced concrete pavement slab cracks , and the results showed that : when the road has been the presence of small surface cracks , consider horizontal load and vertical load together concrete principal stress and crack tip intensity factor compared to only consider the vertical loads have greatly improved ; spreading in the majority of crack propagation stage of the crack tip stress intensity factor than the shear due to horizontal load the cut stress intensity factor is much larger , horizontal loads is an important factor to promote crack propagation , so normal traffic ; calculated in normal driving , of CRCP structural parameters and the crack length of the the pavement crack tip stress intensity factor , and compare the changes with the crack length , the cracks and the bottom of the plate crack development in CRCP board , from which can be drawn reinforced configuration 1 /3 of the thickness of the surface of the surface layer can better reduce the concrete principal stress and the inhibition of pavement crack extension .

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CLC: > Transportation > Road transport > Road works > Roadbed, pavement engineering > Pavement Engineering > Road : use of the material points > Cement concrete pavement > Continuously reinforced concrete pavement
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