斜交框构桥开裂系统分析及结构补强处理

Analysis of the Cracking of an Oblique Crossing Frame Bridge and Its Reinforcing Structure

经过对斜交框构立交桥板体开裂原因分折，提出了引起板体开裂的主要原因是弹性地基基础不均匀沉降、设计时未考虑顶板实际填土荷载、钢筋保护层过厚、斜交配筋不合理。研究了结构补强的可行性，分析了补强的效益。

The main factors are suggcstedl causing the cracking on the surface of an oblique crossing frame bridge It is revealed that the internal stress of the structure has bcen changed,which was induced by the uneven subsidence of the elastic bed,by the fault made in calculating the loads of placing the shock load as the structural weight itself,by too thick a safeguard layer around the structural steels,and by the disproportional oblique crossing steel bars. The procedure proposed to reinforce the structure has been proved to be feasible and effective.