论文部分内容阅读
对拱桥则既要考虑地基液化引起墩台下沉和岸坡滑移两个方面因素的影响,因此拱桥的抗震加固是比较困难的,到目前为止对下部结构进行加固的尚未有一座,其原因在于投资大,加固困难。因此仍宜区分一般和重点桥梁考虑。对一般性拱桥宣考虑: 一、烈度≥7度时,对小跨径单孔和连孔拱桥要防止端腹孔的落撰。二、烈度≥7度时,要防止主孔的落拱。三、对小跨径连孔拱桥可考虑在全桥范围内设置底撑防止岸坡滑移。对重点性桥梁,当岸坡滑移时,其最有效的途径在于设置底撑,当全桥设置底撑有困难时,可在岸坡突变处附近若干孔设置底撑,亦可有一定效果。其次是加大桩基在顺
For the arch bridge, it is necessary to consider the influence of foundation liquefaction caused by two factors of abutment sinking and bank slope slippage, therefore the seismic strengthening of the arch bridge is more difficult, so far there is not one for the reinforcement of the substructure Is investing, strengthening difficulties. Therefore, it is still appropriate to distinguish between general and key bridges. Proposed to consider the general arch bridge: First, the intensity of ≥ 7 degrees, the small-diameter single-hole and even the arch bridge to prevent the abdomen hole abortion. Second, the intensity ≥ 7 degrees, to prevent the main hole falls. Third, the small-span even arched bridge can be considered within the framework of setting the bridge to prevent shore slip. For the key bridges, the most effective way when the shore slope slips is to set the bottom support. When there is difficulty in setting the bottom support of the full bridge, the bottom support may be provided at a number of holes near the sudden change of the bank slope and may also have certain effects . Followed by increasing pile foundation in the cis