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由于梁桥为静定结构,由地基液化引起墩台下沉对梁桥而言引起的震害并不重。因此非刚性地基上的梁桥抗震加固的重点在于防止岸坡的滑移。其最有效的办法是在全桥范围内设置底支,或全河床在桥宽范围内铺砌。其次是加强下部结构的顺桥向抗弯能力,但投资大、施工困难,而且施工期长,有鉴于此,对一般性梁桥在不增大下部结构强度和刚度情况下尽可能的提高其抗震能力减轻震害,办法是: 一、烈度≥7°时,宜对摆柱式或滚动支座采取防止倾斜过大或脱落措施。
As the beam bridge is statically determinate, the seismic damage caused by the pier sinking caused by the foundation liquefaction is not serious. Therefore, the non-rigid foundation of the seismic reinforcement of the bridge is to prevent the bank slip. The most effective way is to set the bottom branch in the whole bridge, or the whole riverbed paved in a wide range of bridges. The second is to strengthen the lower structure along the bridge to the bending capacity, but the investment, construction difficulties, and the construction period is long, in view of this, the general beam bridge without increasing the intensity and stiffness of the substructure as possible Seismic capacity to reduce damage, the approach is: First, the intensity ≥ 7 °, should be on the pendulum column or rolling bearings to prevent excessive tilt or off measures.