双层板水泥混凝土路面板层间粘结状态理论研究

发布时间：2018-04-02 04:09

本文选题：双层板水泥混凝土路面板　切入点：Z模型　出处：《长安大学》2015年硕士论文

【摘要】：我国水泥混凝土路面设计规范中关于双层板水泥混凝土路面只有结合式与分离式两种粘结状态的设计方法,缺少半粘结状态下双层板中拉应力的理论解。本文以文献[1]提出的模型,即Z模型为基础,根据Kirchhoff假设,推导出不同层间粘结状态双层板的中性面公式,中性面位置决定了上下板沿厚度方向应力分布。根据中性面公式再推导出不同粘结状态下双层板板的抗弯刚度,板的抗弯刚度决定了双层板相对刚度半径,进一步可求得板的挠度和弯拉应力。本文分析了Winkler地基上的不同粘结状态时双层板水泥混凝土路面板受力状态,认为存在一个临界状态,临界状态为上下板中性面由一个变为两个的特殊粘结状态。粘结状态介于结合式与临界状态之间的双层板水泥混凝土路面具有一个中性面,粘结状态介于临界状态与分离式之间的双层板水泥混凝土路面具有两个中性面。通过对临界状态的研究导出了中性面和板的抗弯刚度与粘结状态的关系公式,分析上下板厚度和模量的影响规律。运用VB语言自编了计算板弯拉应力的程序,可以求解Winkler地基上不同粘结状态双层水泥混凝土板的任意位置的弯拉应力分布。最后将本文结果与弹性半空间地基双层板的应力进行了对比,找到两者之间关系,使得本文研究结果能应用于弹性半空间地基双层板的应力求解,为半粘结状态双层板水泥混凝土路面设计提供一种新的思路。
[Abstract]:In the design code of cement concrete pavement in our country, there are only two kinds of design methods of bond state of cement concrete pavement with double-deck slab, one is combination and the other is separated. In this paper, based on the model proposed in reference [1], Z model, according to Kirchhoff hypothesis, the neutral plane formula of bilayer plates with different interlaminar bonding states is derived. The position of neutral plane determines the stress distribution of upper and lower plates along the thickness direction. According to the neutral plane formula, the bending stiffness of bilayer plates under different bonding states is derived, and the relative stiffness radius of bilayer plates is determined by the bending stiffness of plates. The deflection and flexural stress of the slab can be obtained further. In this paper, the stress state of double-deck slab cement concrete pavement slab under different bond states on Winkler foundation is analyzed, and it is considered that there is a critical state. The critical state is a special bond state in which the neutral surface of the upper and lower slab is changed from one to two. There are two neutral surfaces in the cement concrete pavement with double-deck slab which is between the critical state and the separated form. The relationship between the bending stiffness of the neutral plane and the slab and the bond state is derived through the study of the critical state. The influence law of thickness and modulus of upper and lower plate is analyzed. The program of calculating bending tensile stress of plate is compiled by VB language. The flexural stress distribution of bilayer cement concrete slabs with different bond states on Winkler foundation can be solved at any position. Finally, the relationship between the results obtained in this paper and the stresses of bilayer slab on elastic half-space foundation is compared, and the relationship between them is found. The results of this paper can be applied to the stress solution of the bilayer slab on elastic half-space foundation and provide a new way of thinking for the design of semi-bonded double-layer slab cement concrete pavement.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.216

【共引文献】