随机车流作用下T梁桥的整体刚度特性

采用有限元程序ANSYS建立T梁桥的铰接、湿接及湿接加整体层3种不同联结方式的空间杆单元模型, 编制了随机车流荷载谱, 利用桥梁动力分析软件系统(BDANS)计算了T梁桥在随机车流下的动挠度, 分析了其整体刚度特性。研究结果表明: 动力响应的横向分布规律和静力反应规律基本一致, 铰接联结T梁桥各片梁动力响应差异最大, 表明其整体刚度最差, 在各种运营状态下的最大动挠度是湿接与湿接加整体层联结方式时的1.30倍以上, 在一般运营单车道作用下达到了2.02倍, 而湿接和湿接加整体层联结各片梁动力响应一致性较好, 因此, 后2种联结方式显著提高T梁桥整体刚度。

Whole rigidity characteristic of T-beam bridge under random traffic flow

ANSYS program was used to establish the space bar element models of T-beam bridges with three different transverse connections, such as hinging, wet seaming and wet seaming with integral layer.The load spectrum of random traffic flow was programmed.Bridge dynamic analysis system(BDANS)was used to calculate the dynamic deflection of T-beam bridge under random traffic flow, and its whole rigidity characteristic was analyzed.The result shows that the rule of transverse distribution of dynamic response is consistent with that of static reaction.The dynamic response of every beam for T-beam bridge with hinging connection is very different, which shows that its whole rigidity is worst.Its maximum deflections under various traffic operations are 1.30 times larger than those with other two connections, and can reach 2.02 times as much as those under regular one-lane traffic operation.The dynamic response of every beam for wet seaming connection and wet seaming connection with integral layer is similar.Therefore, the whole rigidities of T-beam bridges with the latter two connections increase evidently.