【摘要】 以澜沧江大桥为例， 阐述了公路大桥设计地震动参数确定的原理、方法与过程，其结果可供大桥抗震设计选用。指出： 用地震动峰加速度和峰速度标定高速公路大桥的设计地震动参数是合理的； 对于高速公路大桥的抗震设防， 应给出８０ 年代设计基准期６３ ％ 、１０ ％ 和２ ％ 三个超越概率水准的设计地震动参数； 对于重要的桥梁， 尚应考虑支座的差动。更多还原

【Abstract】 Taking the Lancangjiang bridge as an example, the paper discussed the principle, method and process of determining ground motion parameters to design bridge of high way, which can be used in aseismic bridge design. It pointed out that it is reasonable to calibrate designing ground motion parameter by the peak acceleration and peak velocity. To the aseismic fortification of bridge of high way, three designing ground motion parameters with surpassing probabilities of 63%, 10% and 2% for 80 years should be given. To the important bridges, the differential action on the abutment should be considered.更多还原