刚性铺面的平衡刚度设计理念与原型结构

Balance-Stiffness Design Concept and Prototype Structure of Rigid Pavement

针对传统刚性铺面结构在设计年限内板边、角易开裂的问题,基于美国国家机场铺面测试中心的CC1和CC2试验段的测试结果,结合Westergaard的理论解,提出了结构刚度概念与刚性铺面结构平衡刚度设计理念,即增加铺面板边、角的结构刚度,使整个铺面板在板边、板角和板中3个荷位处的结构刚度处于平衡状态。随后,通过CC6足尺加速加载试验,验证了基于平衡刚度设计理念的铺面结构可以有效缓解和预防板边、角裂缝的产生,并且设有刚性基层的等厚度面层板可以达到同样的效果。最终,结合平衡刚度设计理念及试验结果,提出了平衡刚度刚性铺面结构的一般形式,同时考虑工程应用设计了一种基于平衡刚度设计的刚性铺面的原型结构。研究成果可为刚性铺面结构的平衡刚度设计提供理论基础。

Aiming at the early crack at the edges and corners in the design life of the traditional rigid pavement structure,based on the experiment result of the full-scale tests in FAA’s NAPTF CC1 and CC2,combined with the Westergaard theorical solution,a balance-stiffness design concept and a structural stiffness concept are proposed in this paper,that is,increasing the structural stiffness in the slab edges and slab corner,balancing them with the centroid of the slab approximately. According to the result of the full-scale test CC6,the effect of crack alleviating of this concept has been verified,and the rigid pavement with flexible base can also reach the same goal. The general form of the rigid pavement structure and a prototype structure considering engineer application has been proposed based on the balance-stiffness design concept. The research results can provide a theoretical basis for the balance stiffness design of rigid pavement structures.