水泥混凝土板下脱空状况时接缝处弯沉的影响分析

以ANSYS有限元计算软件为基础，通过设置剪切弹簧采模拟接缝的传荷能力，建立了能考虑传力杆影响的水泥混凝土板三维有限元分析模型。通过分析得到了缝边中部脱空和板角脱空两种状态下，受荷板和非受荷板弯沉随脱空尺寸及剪切弹簧系数K的影响规律。研究表明，脱空状态下，受荷板和非受荷板弯沉都比较大，且随脱空尺寸的增大而增加，但在板角脱空状态时脱空尺寸对弯沉的影响更明显，同时脱空尺寸对接缝传荷能力也有一定影响，当受荷板和非受荷板下都存在脱空时，影响最明显．但仅受荷板脱空时脱空尺寸对接缝传荷的影响甚微。

Analysis of deflection at joint on the condition of PCC void subgrade

Using the software of ANSYS,three-dimension finite element model of cement concrete slab is established in this paper. This model can consider the influence of dowel bar through setting shearing spring. The forced and unforced deflection variation rules with the size of void and shearing spring coefficient K are obtained, when the void is under the middle of joint or the comer of slab. The research shows that the deflection of forced and unforced slab are both big, moreover the deflection is bigger with the void size increasing. But the influence of the void size on deflection is more obvious. Meanwhile the void size has an influence on the ability of load - transfer. When the void is under both forced slab and unforced slab, the influence is best obvious. When the void is only under forced slab , the void size affects load-transfer little.