【摘要】 平板式筏板基础是多高层建筑常用的基础形式之一,其板厚一般是由冲切条件控制的,一般较厚.为减小筏板的厚度,提出了钢纤维增强筏板基础节点以提高其抗冲切承载力的方法,并进行了带柱头板的冲切性能试验.针对目前广泛采用商品混凝土,提出了现场分层铺撒钢纤维的施工方法.试验结果表明,相同条件下采用钢纤维局部增强的板冲切承载力高于无钢纤维的混凝土板;分层铺撒钢纤维的混凝土板和预先拌匀钢纤维的混凝土板冲切性能相近.推导了钢纤维混凝土板冲切破坏极限承载力的计算公式.更多还原

【Abstract】 Raft slab foundation is one of the frequent foundations of tier and high-rise buildings, the thickness of slab is determined by punching shear bearing capacity, the slab is usually thicker. In this paper, it gives raft foundation joint partially reinforced by steel fibers in order to reduce its thickness and the experiment of slab with column about punching shearing forcewas carried out. Thispaper also givesa construction method of laminar spreading steel fiberson site, which can be widely applied in product concrete at present. The test results indicate that the punching shear bearing capacity of the slab partially reinforced by steel fibers is higher than that of the concrete slab with no steel fibers, and the punching shear capacity of the slab made by different methods of laminar spreading steel fibers and mixing fibers in advance is simi-lar. It is deduced the equation of the punching shear bearing capacity of the slab reinforced by steel fibers.更多还原