The Experimental Study On The Cast-in-situ Concrete Hollow Floor Under Vertical Load

Cast-in-situ concrete hollow floor is a ne w type of str uctural system, which is developed by t wo-way ribbed a flat bea m floor structure.It has the advantage of suitable for large span, light weight, low cost, less consumption of materials, floor bottom surface level of f,good for decoration engineer ing.Compared with the traditional ribbed slab f loor, its f lexural rigidity bigger, coordinated with adjacent components deformation under vertical lo ad and mechanical properties of more complex problems.This paper, through the water load test and numerical analysis, to study the mechanism of the hollow floor under vertical load, the research results are as follows:(1) two adjacent cr oss hollow floor and wi de flat beam live tank loadi ng test results show that in the wide flat beam line stiffness ratio and per m width of hollow slab line stif fness ratio of 2. 0, wide flat beam can't form effective constraint of hollow slab, crack and deflection is one-way slab's mechanical characteristics, can be designed according to one-way slab.(2) hollow slab- shear wall at the sc ene of tank loading test results show that under the condition of she ar wall wit h hollow slab t hickness, the shear wall out-of-plane flexural deformation is opposite bigger, hollow slab end be nding moment on the properties of the shear wall out-of-plane stress influence should not be neglected.(3) based on la yered shell finite element analysis results show that when the beam line stiffness ratio is 8.5, wi de flat beam of hollow floor to take to the constraint effect, achieve the transition of the one-way slab stress and the two-way plate stress form, show that in most cases, to the hollow floor slab can be designed according to one-way slab.