| Continuously reinforced concrete pavement(CRCP) has enough longitudinal steels in the pavement so as to control extended cracks caused by longitudinal shrinkage along pavement slabs. It also can not set expansion joint and contraction joint at all in the construction, thus formed one complete and flat driving surface. CRCP has many advantages such as better driving comfort, better pavement bearing ability, longer service life, lower pavement maintenance etc. compared with common cement concrete. Development and application of CRCP will have broad prospects in the construction of high grade highway in China.Firstly, this article analyse the formation mechanism of transverse crack and introduce the design principle and method of CRCP. Secondly, according to different overlapping length and lashing length of longitudinal steels in pavement slabs,i calculate frictional resistance in the place of overlapping steel bars when using different overlapping length and lashing length. Meanwhile I use finite element analysis software ANSYS to make concrete and steel bars become different units in order to treat them individually. Considering bond-slip effects between concrete and steel bars, I use bond-slip unit—COMBIN39 to simulate bond-slip effect between concrete and steel bars, and establish calculation model of CRCP transverse crack, then calculate and analyse the behaviors of CRCP transverse crack and the effects to three design indexes of CRCP(transverse crack spacing, transverse crack width, the largest steel bar stress). I also calculate the influences which come from overlapping length to transverse crack spacing and transverse crack width of CRCP and achieve the aim which can guide practical construction by the calculation results. Make use of the finite element model and combine our criterion for crack space and crack width to design the CRCP reinforcing. Finally, I introduce features of transverse crack of CRCP and propose corresponding construction control measures.
|
PDF Full Text Request