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双柱框架式桥墩在山区中等跨径桥梁中应用广泛,但目前对其上横系梁的布置方式还是凭经验进行设计,缺少客观依据。该文以一采用双柱式框架墩的三跨连续梁桥为例,基于不同墩高下横系梁不同布置时结构静动力性能的参数分析,研究了不同墩高下墩底横系梁和中横系梁的不同布置对下部结构及整体结构受力的影响规律。结果表明:双柱框架式桥墩应设置墩底横系梁;墩高小于10m时,只需设置墩底横系梁;墩高介于10~50m之间时,在设置墩底横系梁的同时,应加设1~3道中横系梁。
The double-column frame pier is widely used in medium-span bridges in the mountainous area. However, the layout of the upper cross-beam is still based on experience and lacks objective evidence. Taking a three-span continuous girder bridge with double-column frame pier as an example, based on the parameter analysis of the static and dynamic behavior of the cross-girder with different piers under different piers, the transverse girder and cross- The effect of different arrangement of tie beam on the force of the lower structure and the whole structure. The results show that the pier should be set at the bottom of the pier. When the pier height is less than 10m, only the pier at the pier bottom is required. When pier height is between 10m and 50m, At the same time, should be added 1 to 3 in the cross-beam.