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桩基承受水平地震作用时,桩与承台处的弯矩和剪力值都为最大,为避免连接处过早发生破坏,需要对连接处构造进行加强。通过制作普通双桩基础和增设连接墙双桩基础两种形式的缩尺模型,进行低周往复加载对比试验,对两种试件在各级荷载下的荷载-位移曲线和桩身弯矩分布进行比较,得出增设连接墙的双桩基础水平承载力、耗能能力及抗弯刚度都较普通双桩基础有大幅度提高,且连接墙的存在使桩身弯矩峰值所在位置发生改变。
When the pile foundation is subjected to horizontal seismic action, the bending moment and shear force at the pile and cap are the maximum. To avoid the premature failure of the joint, the structure of the joint should be strengthened. By making ordinary double-pile foundation and adding double-foundation model of double-wall foundation with connecting wall, the low-cycle reciprocating loading contrast test is carried out. The load-displacement curve and bending moment distribution of two kinds of specimens under different loads The results show that the horizontal bearing capacity, energy dissipation capacity and flexural rigidity of double wall foundation with connecting wall are greatly increased compared with ordinary double pile foundation, and the existence of connecting wall changes the position of pile bending moment.