| Cast-in-situ reinforced concrete hollow slab floor system is a new floor structural system which can suit multilayer or tall buildings with big column gridding or big spaces. It can offer owners flexible spaces economically, and have a wide used foreground. Whereas, as a new technics, it's properties have not been comprehended adequately. And, it's calculating theoretics and design measures are still not consummate.Based on the contrast experiments and finite element analysis of some groups of parallel slabs and perpendicular slabs, and finite element analysis of big concrete hollow slabs, the property dissimilarity of parallel slabs and perpendicular slab and the load transfer path has been studied; The changing rule of the dissimilarity influenced by the diameter and interval of hollow tubes and the thickness of concrete up and under the tubes has been studied; Also, the effect of transverse ribs has been studyed. Finally, some conclusions have been made. When tube's diameter is small and endlong ribs and concrete up and down the tube is comparatively thicker, the dissimilarity of parallel slabs's flexural rigidity and perpendicular slabs's flexural rigidity is not evidence. When tube's diameter is big and endlong ribs and concrete up and down the tube is comparatively thiner, the dissimilarity of parallel slabs's flexural rigidity and perpendicular slabs's flexural rigidity is become evidence.When the interval of hollow tubes and the thickness of concrete up and under the tubes are not changed, with the diameter of tube becoming biger, the dissimilarity of parallel slab and perpendicular slab is becoming biger linearly. The shearing rigidity of slabs is great effected by the cavum, especially to perpendicular slabs, slanting cracks always arises on endlong ribs.Contraflexure is disadvantageous to hollow slabs; Because of the reverse displacements of concrete on and down the tube , endlong ribs always be laniated. And tearing cracks always appear abruptly, the break is friable.
|
PDF Full Text Request