STC钢桥面铺装新体系的力学计算与实桥试验对比分析

Comparison of Mechanical Calculation and Actual Test for New STC Steel Bridge Paving System

为解决当前钢桥面铺装层易破损及桥面钢结构疲劳开裂两大病害难题，提出了超高韧性混凝土（Super Toughness Concrete，STC）钢桥面铺装新体系，并首次应用于广东马房大桥上；采用有限元计算结果与第三方实桥检测数据相对比的方法分析了新体系的铺装效果。研究结果表明：钢-STC组合桥面结构大幅提升了桥面的刚度，新铺装体系正交异性桥面板各控制点的应变及竖向位移峰值降幅达46．82％～90．89％，改善效果远超过原有的沥青铺装；STC材料抗拉强度完全能满足最大拉应力7．97MPa的受力要求；基于薄层STC的钢桥铺装新体系可以有效降低钢桥面结构的应力及变形，改善铺装层的受力状况，从而消除钢桥面疲劳开裂及铺装层开裂、车辙等风险。

In order to solve the problems of early damage in bridge paving and fatigue crack in steel deck, a new super toughness concrete （STC） steel bridge paving system was presented and applied firstly to the Mafang Bridge, Guangdong Province. The effect of STC paving system was evaluated with the finite element analysis and the actual test. The results indicate that the paving stiffness of steel plate -STC composite structure is improved greatly, and the maximum strain and vertical displacement decrease by 46. 82%-90. 89% at each control point. Compared with the asphalt pavement, the new system is more effective. The tensile strength of the STC satisfies the required maximum stress of 7. 97 MPa. STC paving system can effectively reduce the strain amplitude and vertical displacement of the bridge deck and improve the mechanical performance of paving layers, thus eliminating the risks of steel plate fatigue cracking, pavement cracking and rutting damage.