CRCP reinforcement ratio design method based on dense fracture punching estimation

Abstract

The invention discloses a CRCP reinforcement rate design method based on dense crack punching estimation. The method comprises the following steps: 1) initially simulating a pavement structure and a reinforcement rate; 2) determining material parameters required by pavement structure design; 3) calculating and determining the load fatigue stress sigma pr of the continuous reinforced concrete pavement under the condition that the average crack spacing is 0.3 m; 4) calculating and determining the temperature fatigue stress sigma tr of the continuous reinforced concrete pavement under the condition that the average crack spacing is 0.3 m; and (5) determining a reliability coefficient gamma r according to the road grade, judging whether the continuous reinforced concrete pavement is broken bypunching or not by judging the relationship between gamma r*(sigma prr + sigma tr) and fr, judging that the preliminary scheme is reasonable if the requirements are met, and otherwise, redesigning thereinforcement ratio and the pavement thickness until the requirements are met. According to the method, the vacancy that the thrust estimation is not considered when the CRCP pavement reinforcement ratio is calculated is filled up. The reinforcement ratio is crucial to CRCP performance and economy, so that the method has remarkable social and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and in particular relates to a CRCP reinforcement ratio design method based on thrust estimation at dense cracks. Background technique [0002] Continuously Reinforced Concrete Pavement (CRCP) refers to the cement concrete pavement that is equipped with longitudinal continuous steel bars and transverse continuous steel bars in the surface layer, and there are no expansion joints or shrinkage joints (except construction joints and expansion joints required for construction) in the transverse direction of the pavement. Compared with ordinary cement concrete pavement, CRCP runs smoothly, has a long service life, is easy to maintain, and has a good development prospect. [0003] Thrust refers to two transverse fractures with small spacing (generally less than 0.6m). The area enclosed by short longitudinal cracks and pavement edges or longitudinal joints and serious Y-shaped cracks such as s...

AI Technical Summary

Problems solved by technology

However, thrusts generally occur in dense fractures, so foreign methods for estimating thrusts are obviously inappropriate

In addition, there are many material parameters in the calculation process, and the material parameters and temperature parameters of each hour within the pavement design period are required. For developing countries such as China, these parameters are difficult to obtain

Images