重力式桥台开裂的机理分析

针对重力式桥台经常出现开裂的情况,根据现行规范分析桥台的构造要求及桥台计算的适用条件,给出了侧墙滑动面受限制的土压力公式,将土压力值作为面荷载作用在前墙和侧墙,应用Nastran有限元程序对一座重力式桥台进行数值分析,计算结果与实际变形、开裂吻合较好.建议在设计重力式桥台时,应严格按照规范规定的构造要求,必要时还应验算台内填土对桥台产生的土压力影响,以确保桥台安全.

Mechanism study of a gravity abutment crack

Aiming at the case that a gravity abutment often cracked during construction and use stage, the abutment dimension and the appropriate for condition have been discussed according to the current specification. The formulas of soil pressure with the limited slide surface of wall were given in this paper. The value of soil pressure was acted on the forward wall and side wall as surface load. The numerical analysis by Nastran finite element program has been made for the actual gravity abutment. The calculation result was in agreement with the real crack and deformation in the position. To ensure the safety of construction and durability, we strongly suggest that must be abiding the specification about configurations. If necessary, it should be calculated the inner soil pressure of the acted on wall.