浅析T型空心桥台相对U型桥台的适用性

Initial Analysis on Advantage of T-type Hollow Abutment over U-type Abutment

T型空心桥台能够充分利用混凝土和钢筋的材料性能,从而节省材料;并能减轻自重,减少圬工,降低对地基承载力的要求.目前在工程实际当中,T型空心桥台已有使用.通过对在不同填土高度下的具有相近尺寸的T型空心桥台和U型桥台进行方案设计,并将两种桥台的自重以及在荷载作用下台底和基底的应力、偏心及其基础稳定性的检算结果进行分析,得出这两种桥台随台后填土高度变化时的自重、台底和基底应力、偏心以及基础稳定性的相应变化规律;进而探讨T型空心桥台相对U型桥台的适用性,并得到两种桥台的适宜填土高度范围.

T-type hollow abutment can take full advantage of material performance of concrete and rebar so that it can save materials.It can also reduce deadweight and masonry.And then,the requirement for foundation bearing capacity is low.Now T-type hollow abutment has been used in engineering.According to the schematic design about T-type hollow abutment and U-type abutment with similar overall dimension and under different depth of fill, and with the analysis of self weight,platform stresses and base stresses、partiality under loading action and even foundation’s stability of two kinds of abutment,then the relevant variation law of self weight,platform stresses and base stresses,partiality and foundation’s stability in the wake of height increase of depth of fill behind the abutments can be found;and then,the advantage of T-type hollow abutment over U-type abutment can be discussed.It would be obtained that the limits of appropriate depth of fill of the two kinds of abutment.