The Out-of-Plane Strength Of The Precast Hollow Floor Plate After Integrity Reinforcement By HPFL

In this paper, the out-of-plane strength of the precast hollow hloor plate was investigated after integrity reinforcement by HPFL composite covers. HPFL is an abbreviation of the high performance Ferro-cement laminates. HPFL precast hollow floor slab is a perfect combination of both precast hollow circular hole and HPFL, by paving different widths HPFL of narrow strip on the surface of precast hollow slabs, so as to make HPFL composite covers and precast hollow slabs form a whole, enhancing the integrity of the floor and overcoming the fatal pro blem of precast hollow floors.This interity way could make HPFL precast hollow floor slab becoming monolithic assembly slab systems. We had research ed on the out-of-plane strength of the slabs reinforcement by measuring the deflection of each assembly prec ast hollow, crack development,and whether either precast hollow slabs collapsed in all cases.In the experience, the out-of-plane strength of the precast hollow hloor plate was investigated after integrity reinforcement by HPFL composite covers by three conditions under simulate earthquakes action. First case was used sands to add live load by four levels in consideration of twice times dynamic coefficient, after the loading ended, second case was emptied the wall under the first hollow slab at the side slabs of A-axis of wall, third case was emptied the wall of B-axis under the hollow slabs. Second case and third case were aimed to simulated wall collapsed at uncertain positions in earthquake. We also used Abaqus finite element analysis program to simulate and analyze the test model. The calculated deflections of hollow slabs in finite element model were match with the actual test results well.As the composite cover of precast hollow plate, HPFL can effectively improve the integrity of precast hollow floor slab, also increase the the out-of-plane strength of slab, made hollow slab continuous at both vertical directions of horizontal direction, and any stiffness of the horizontal components in this plane approaches infinity, so structural integrity and earthquake resistant performance o f hollow slabs are guaranteed. HPFL integrity reinforcement for precast hollow plate not only can be a reference in engineering design, but also in the majority of towns and villages areas using quality and inexpensive precast concrete hollow slab s in new buildings.