The full-scale indoor test of two spread foundation with same dimensions was carried out separately under uplift alone and uplift combined with horizontal loads in order to observe their bearing capacity and crack expansion regularity.The load displacement of foundation top plane

strain of reinforcing bars and concrete were measured and analyzed.The results show that the uplift load-displacement performance of foundations almost followed the same two-phase pattern in two kinds of load cases.However

under a combination of uplift and lateral load

the lateral displacement linearly increased with the horizontal load.And the lateral load reduces the uplift bearing capacity.The cross-section of the foundation is partially in tensile and partially in compressive stress state respectively.The crack do not break through the whole section.And the maximum tension stress is in the intersection of the foundation pillar and slab.The crack break through the whole section when the foundation is subjected to uplift load only.