承压板位置对混合塔结合部承载性能影响

Influence of Bearing Plate Position on Carring Properties of Connection in Hybrid Tower

为揭示混合塔结合部承压板位置对承载性能及传力机理的影响,以两座混合塔斜拉桥为工程背景,进行了前承压板式和后承压板式结合部缩尺模型承载性能试验,测试了钢与混凝土的应变及相对滑移的分布,并对两种结合部的差异进行了比较分析.研究结果表明,混合塔前、后承压板式结合部的承压板传力比例均为40%左右,减少了连接件传递剪力的比例;由于承压板发挥较大作用,前、后承压板式结合部钢与混凝土间相对滑移较小;连接件剪力分布取决于承压板位置;前、后承压板式结合部均能发挥承压板传压和连接件传剪的复合作用,可作为混合塔结合部构造形式.

To investigate position on load bearing the influence of bearing plate properties and mechanism of connections in hybrid towers, tests of reduced-scale specimens with front bearing plate or back bearing plate, which are related to two hybrid towers in cable-stayed bridges, were conducted. In these studies, strains of both concrete and steel plate and the slip between two materials were measured, and the differences between the specimen with front bearing plate and that with back bearing plate were compared as well. The results show that the existence of a bearing plate, which will bear approximately 40% of the loadings, can lead to a reduction in the shear force taken by shear connectors. Because of the important role played by the bearing plate, the slip between steel and concrete in the joint connection will decrease. In addition, the distribution of shear connectors is highly related to the location of bearing plate. Generally speaking, the joint connection with bearing plate with front bearing plate or back bearing plate can be considered as an excellent construction type in hybrid towers due to their outstanding performance in the cooperation of the bearing plate and shear connectors.