腋角构造对叠合板式拼装综合管廊下部节点受力性能影响分析

Influence Research on Haunch on the Mechanical Performance of Bottom Connec-tions of Municipal Tunnel Composed of Composite Walls and CIP Bottom Slabs

开展了2个叠合板式拼装综合管廊下部边节点足尺模型的低周反复荷载试验,在试验基础上,建立了叠合板式拼装综合管廊下部中节点的有限元分析模型,进一步开展了腋角构造对下部边节点和中节点受力性能的影响分析。结果表明,腋角构造对节点的破坏形态影响较小,2个边节点均发生壁板或底板端部截面受弯破坏;腋角构造对边节点正向(管廊内侧受压)承载力影响较小(二者相差1.9%),但对反向(管廊内侧受拉)承载力影响较大(无腋角节点比有腋角节点低约31%);腋角构造对中节点的总体影响较小。

To investigate the haunch dimension influence for bottom connections of municipal tunnel consis-ted of composite walls and CIP bottom slabs,two specimens were tested under low reversed cyclic loading and a nonlinear finite element analysis model by ABAQUS software was established.Results demonstrated that for exterior composite connection,the failure pattern of the composite connections and CIP connections are both characterized by flexural failure at the end section of the vertical or bottom slabs.The seam position is less influenced by exterior joints,the bearing capacity of the specimen without haunch is close to that of the specimen with haunch.For interior joints,the influence of the haunch dimension is small,but the bearing capacity in-creases with the increase of the seam position.The bearing capacity increases with the increase of axial compres-sion ratio for exterior and interior joints.