无伸缩缝桥梁合成梁式结点的受力性能和试验研究

Study on the Bearing Capacity of Jointless Bridges with Composite Crunode and Test

提出一种受力性能介于整体式和半整体式桥台无伸缩缝桥梁之间的新型的结点构造方式———合成梁式的结点构造。通过有限元通用程序ANSYS建立该结点的有限元模型,研究在最不利荷载情况下的结点受力性能及结点参数对受力性能的影响,并进行了结点模型试验。研究表明,合成梁式的结点可用于无伸缩缝桥梁设计;在满足设计承载力的情况下,桥台的高度和长度宜取小值;桩存在一个合适的相对刚度,当桩相对刚度超过这个值时,对合成梁式的结点受力几乎没有影响。

composite crunode structure of Jointless Bridges, a new type of crunode structure with bearing capacity between that of the integral abutment bridges and that of the part integral abutment bridges was brought out.Ihe FE model of the composite crunode was built through the FE program ANSYS, then the bearing capacity of the crunode was analyzed under the condition of unfavorahle loading, and the parmetric analysis was conducted, What is more, the model experiment of the composite crunode was done.The study showed that the composite crtmode can be adopted in the design of the Joinfless Bridge, that the height and length of the abutment should be minimized when the design capacity satisfied, that there was a proper value of the relative stiffness in the piles and the relative stiffness has little effect on the bearing capacity of the crunode when it was above the proper value.