以UHPC作铰缝填料的高强空心板桥为研究对象, 利用通用有限元软件ABAQUS建立三主梁、两铰缝, 跨度为10m的空心板有限元模型, 计算在结合面光滑S、中度粗糙M和粗糙R这3种粗糙度状态下极限荷载作用时接触面的损伤特性, 并对不同位置接触面进行正应力和剪应力分析.结果表明:结合面光滑状态时仅自重作用下铰缝的接触面较负载铰缝先发生损伤, 其他两种状态则相反;结合面无论何种粗糙度状态, 接触面最下缘位置始终是损伤起始位置, 且接触面损伤主要是由横向受拉引起.若使用UHPC作铰缝填料, 甚至推广到作纵横接缝, 均可考虑将铰缝或接缝下部接触面做成粗糙结合面, 而上部及中部接触面做成中度粗糙结合面, 达到安全、耐久和经济的效果.%Based on high-strength concrete hollow slabs with UHPC as the filler of hinge joints, a FEM of a hollow slab with a span of 10 m, composed of three beams and two hinge joints, is established by the software ABAQUS to analyse the damage characteristics of contact surfaces under the ultimate load and the normal and shear stresses at different positions in three different roughness states:smooth (S) , midrough (M) , and rough (R) .Results show that, when the bonding surface is smooth, the hinge joint under no loads is damaged faster than that under loads.For the other two states, however, the opposite results are observed.The damage initiates at the bottom for any roughness conditions and the contact surface is damaged mainly due to the transverse tensile stress.If UHPC is used to fill hinge joints or served as longitudinal and horizontal joints, it is suggested that the rough bonding surface of UHPC joints should be made on the bottom contact surface, while the upper and middle contact surfaces are designed to be the midrough bonding surface of UHPC joints to achieve safety, durability, and economy.
展开▼
