配筋方式对桩基厚承台承载性能影响的试验

为研究不同配筋方式对混凝土厚承台承载性能的影响,通过对3个配置不同形式钢筋的混凝土9桩承台进行破坏性试验,对不同配筋形式的承台受力机理和破坏模式进行探讨,证明厚承台符合空间桁架模式的受力特点,集中方式配筋有利于发挥钢筋的抗拉作用,在承台中部配置的钢筋网片能延缓混凝土压杆的劈裂破坏,在承台底部集中配筋的基础上增加中层钢筋网能有效提高承台的承载力。最后给出桩基承台配筋设计的建议。

EXPERIMENT ON THE FORMS OF REINFORCEMENT AFFECTING LOAD BEARING BEHAVIOR OF DEEP PILE CAPS

To study the effects of reinforcement forms on the load bearing behavior of deep pile caps,through the destructive tests of three nine-pile caps with different forms of reinforcement,the load-bearing mechanism and failure modes of the pile caps.The analytical results proved that the load bearing behavior of pile caps conforms to strut-and-tie models,reinforcement arranged in bunch can make full use of the tensile performance of reinforcement,mat reinforcement arranged in the middle of pile cap can delay the splitting of concrete struts,and the combination of bunch reinforcement and middle mat reinforcement can increase the bearing capacity of pile caps effectively.Finally, some suggestions on designing pile cap reinforcement are given.