某大桥桩柱-盖梁结构体系开裂研究

Cracking of Pile and Capping Beam Structure System of One Bridge

针对衡水市某大桥盖梁与桩柱上出现严重裂缝的情况,通过对桥面汽车加载条件下的盖梁截面应变、柱身应变、基桩沉降、裂缝扩展等方面的测试,研究裂缝开裂的力学机理,并应用有限元分析进行模拟验算。然后进行桩周土瞬态面波测试,研究桩周土面波速度随深度的变化。最终总结出裂缝开裂原因。

In allusion to the situation of cracking of piles and capping City, by tests of sectional strain of capping beam, pillar strain, pile settlement beams of one bridge in Hengshui and crack propagation under vehi- cle loading of bridge pavement, it analyzes the mechanical mechanism of cracking and uses finite element analy- sis to conduct simulation checking calculation. Then via transient surface wave test of soil around pile, the change of surface wave velocity of soil around pile along with depth is analyzed and the reasons of cracking are put for- ward finally.