墩间横系梁对连续刚构桥刚度影响分析

归纳了桥梁刚度的衡量指标,挠度、周期、稳定系数和抗推刚度,分析了各指标的适用前提。以一实际连续刚构桥为例,建立了五个不同的计算模型,对不同的横系梁设置方案对刚度的影响做了分析。计算表明,横系梁的设置对主梁静力刚度几乎无影响,对结构一阶周期影响明显;高墩连续刚构的稳定取决于墩的刚度,随着横系梁的增加,稳定系数也逐步提高,同时墩的抗推刚度也增大,这和连续刚构需要较小的抗推刚度矛盾,在设计时应考虑合理的横系梁设置。

Analysis on Stiffness of Continuous Rigid Frame Bridge with Horizontal Tie Beams between Piers

The indexes to measure of the stiffness of the bridge including deflection, cycle stability factor and anti-push rigidity were summed up, and applicable premise of each index was analyzed. Taking an actual continuous rigid frame bridge as an example, five different calculation models were established to analyze the stiffness. The results show that the horizontal tie beam has no effect on the static stiffness,but on the period significantly; The stability of high pier continuous rigid bridges depends on the stiffness of the pier, with the increasing number of tie beams, the stability factor increasing, while the anti-push pier stiffness also increases, which is contradictory to demand of slenderness of piers. A reasonable cross-tie beam settings should be considered in the design.