UHPC华夫桥面单向板的荷载有效分布宽度及抗弯承载力计算方法

Calculation method for effective distribution width of load-distribution and flexural capacity of UHPC waffle one-way deck

为了研究UHPC华夫桥面单向板的荷载有效分布宽度及其抗弯承载力的计算方法,采用ANSYS软件建立了4_(1)组华夫板有限元模型.通过数值分析研究了华夫桥面单向板横向跨径、纵横肋尺寸与布置、荷载作用面积及支承条件对其弹性和塑性阶段荷载有效分布宽度的影响.考虑横向跨径和横肋间距,拟合了华夫桥面单向板荷载有效分布宽度的计算公式.基于平截面假定,推导出华夫桥面单向板抗弯承载力计算的有效分布宽度法.研究结果表明,固支华夫桥面单向板的荷载有效分布宽度较简支板小30%~50%.当华夫桥面板横向跨径L、肋宽b_(r)、纵肋间距S_(l)、横肋间距S_(t)及车轮荷载面积a_(1)b_(1)满足a_(1)<S_(l)-b_(r),b_(1)<S_(t)-b_(r),S_(t)≤0.6L时,建议使用所提公式来计算荷载有效分布宽度,且计算结果与试验结果吻合良好.

To research the effective width of load-distribution and the calculation method for the bending capacities of UHPC(ultra-high-performance concrete)waffle one-way decks,4_(1)finite element models of waffle decks were established by ANSYS.Through numerical analysis,the effects of the transverse span,the size and arrangement of longitudinal and transverse ribs,the load area and the supporting conditions on the effective widths of load-distribution of the waffle one-way deck in the elastic and plastic stages were studied.The calculation formula of the effective width of load-distribution of the waffle one-way deck was fitted by considering the transverse span and the spacing of the transverse ribs.The effective distribution width method for the flexural capacity of the UHPC waffle one-way deck was proposed based on the plane section assumption.The results show that the effective width of the load distribution of the fixed waffle one-way deck is 30%to 50%less than that of the simply supported waffle one-way deck.When the transverse span L,the rib width br,the longitudinal rib spacing Sl,the transverse rib spacing S_(t)and the wheel load area a_(1)b_(1)meet the requirements of a_(1)<S_(l)-b_(r),b_(1)<S_(t)-b_(r)and S_(t)≤0.6L,it is suggested to calculate the effective load distribution width of waffle one-way deck by using the proposed formula.The calculation results are in good agreement with the experimental results.