Seismic response of underwater concrete pipes conveying fluid covered with nano-fiber reinforced polymer layer. Issue 110 (July 2018)

• Record Type: Journal Article
• Authors: Hajmohammad, Mohammad Hadi; Maleki, Mostafa; Kolahchi, Reza
• Is Part Of: Soil dynamics and earthquake engineering. Issue 110(2018)
• Page Start: 18
• Page End: 27
• Publication Date: 2018-07
• Subjects: Seismic response -- Concrete pipes -- NFRP -- Sinusoidal shear deformation theory -- Agglomeration effect -- DQM; Soil dynamics -- Periodicals; Earthquake engineering -- Periodicals; Sols -- Dynamique -- Périodiques; Génie parasismique -- Périodiques; 624.176205
• DOI: 10.1016/j.soildyn.2018.04.002
• Languages: English
• ISSNs: 0267-7261

Abstract

Abstract: This research deals with seismic response of underwater fluid-conveying concrete pipes during the earthquake in Kobe. The pipe is reinforced with nano-fiber reinforced polymer (NFRP) layer. The displacement filed of the structure is considered based on the sinusoidal shear deformation theory. Navier-Stokes equation is applied to estimate the force due to the inner fluid. Furthermore, the effect of the outer fluid is taken into consideration as an equivalent force. The governing equations are derived on the basis of energy method and using Hamilton's principle. Differential quadrature method (DQM) and Newmark method are applied to obtain the dynamic deflection of the system. The effect of parameters such as NFRP layer, volume percent and agglomeration of nano-fibers, boundary conditions, inner and outer fluids, thickness to radius and length to thickness ratios on the dynamic deflection of the structure is examined. The results show that with increasing the thickness to radius ratio and volume percent of nano fiber and using NFRP layer, the dynamic deflection decreases while considering the inner and outer fluids and agglomeration effect of nano fiber and increasing the length to thickness ratio, the dynamic deflection of the structure increases. Highlights: Seismic response of the concrete pipes covered with NFRP is studied. The structure is subjected to inner and outer fluids. The agglomeration effect of SiO2 nanoparticles is assumed. The structure is modeled by sinusoidal shear deformation theory. DQM and Newmark method are applied for solution.