【摘要】 倾斜基岩上的框架是山地、丘陵地区多见的一种结构形式,但以往对其抗震性能研究很少。本文针对一柱一桩,桩间设置地梁的基础形式,引入了多次透射边界以模拟场地的无限性,利用二次开发后的ANSYS对倾斜基岩上的框架在El-Centro波、Taft波作用下群桩桩顶的荷载分布进行了上下部共同作用分析,以定性的判断地震作用下不同位置桩的受力情况。为了探讨桩端不同约束方式对桩顶最大弯矩的影响,每个算例都分别计算了桩端铰接和桩端固接两种情况。对于倾斜基岩,在A类、B类土层情况下,各桩的最大弯矩分布形状仍呈∪形分布,但长桩所受最大弯矩大于短桩所受最大弯矩。在C类土层情况下,各桩最大弯矩呈∽形分布;当基岩斜率为9∶24时,对于桩端固接的情况,长桩的桩顶最大弯矩大于短桩的桩顶弯矩;对于桩端铰接的情况,则长桩的桩顶最大弯矩小于短桩的桩顶最大弯矩,随着基岩斜率减小,长短桩之间的最大桩顶弯矩差异减小。更多还原

【Abstract】 The frame on the inclined rock-base often appears in mountanious region,but the study of its seismic behavior is sparely done.Based on muli-transmitting boundary and the ANSYS of secondary development,the load distribution at the pile tops in pile groups under dynamic loads on the inclined rock-base is analyzed considering the soil-structure interraction.The effect on the maximum moment at the pile tops with different restraining conditions at the pile ends is proposed.The distribution of maximum moment at the pile tops is ∪ shape under A B kinds of soil,and under C kind of soil the distribution is ∽ shape on the inclined rock-base and ∩ shape on the plain base.更多还原