Study On Behavior Of Precast Hollow-core Slabs Strengthened With HPFL

Due to the problems of precast hollow-core slabs such as poor assembling plates integrity, poor ductility, weak shear resistance in plates plane on both sides and plates seams prone to cracking, huge difference of the two directions’ stiffness in plates plane and earthquake performance is poor, low ability to resisit uneven settlement, brittle fracture and so on, in recent years, it’s obvious to find that China’s earthquake damage have been produced by these problems, but it’s advantages on suitable for industrialized production, low cost, less construction process and wet operation, shorten the construction period, high degree of industrialization and effectively solve the shrinkage crack of cast-in-place structure is also huge. The stand or fall of building roof structure’s aseismatic ability is not on the use of precast-hollow slabs of it or not, but on the technical measures and the reinforcement method to solve the precast-hollow slabs’ problem of poor integrity inside and outside of plane, to popularize economic and environmental precast-hollow slabs that conform to the assembly and the development trend of industrialization. HPFL is used to reinforce the precast-hollow slabs in this paper, and bending performance of outside of plane and shearing performance of inside of plane is mainly discussed, the work performed in this paper are as follows:Out-of-plane bending performance test on four HPFL reinforced specimens and one contrast specimen is conducted, and the out-of-plane bending performance is studied. And ANSYS is used to establish out-of-plane bending performance finite element space model. Research results show that the finite element space model in good agreement with test results, the effect of using HPFL reinforcement technique to improve the precast hollow slab out-of-plane bending ability is huge. And theoretical analysis is conducted to analyze the out-of-plane bending performance, and it’s consistent with the test results.Parallel seam direction in-plane shear test on five HPFL reinforced specimens and vertical seam direction in-plane shear test on one HPFL reinforced specimen is conducted, and the in-plane shear properties is studied. And ANSYS is used to establish in-plane shear performance finite element space model. Research results show that the finite element space model in good agreement with test results, HPFL can significantly improve reinforced specimen in-plane shear properties of the two directions, reinforced specimen can guarantee good integrity and carrying capacity. And theoretical analysis is conducted to calculate the in-plane shear bearing capacity of two directions, and it’s consistent with the test results.Based on the established finite element space model, factors that affecting the HPFL reinforcement plate bending and shear performance is analyzed. Through comparison, a reference basis for various factors in actual reinforcement and selection is proposed. And some suggestions of HPFL reinforced precast-hollow slabs integration is given, a reference for practical engineering is provided. The rural residential project practical application is also introduced, by adopting HPFL reinforcement has achieved good economic benefit and good use of seismic strengthening effects.