Prediction of wall pressures and stresses developed by grainy materials in cylindrical ferrocement silo in static condition
Tóm tắt
Ferrocement (FC) is the most inexpensive and suitable substitute to conventional reinforced concrete. It has number of industrial applications. The flat bed and hopper bed silos are used in industry for various functions. Prediction of wall pressures and stresses developed by grainy materials in cylindrical ferrocement silo in the static condition govern its stability and safety. This paper presents analysis on normal pressure, vertical pressure, hoop stresses and longitudinal stresses on the wall of FC silo with various boundary conditions considering Drucker–Prager model and elastoplastic behavior of the stored materials by finite-element (FE) modeling using ANSYS 15 (APDL). The FE predictions are in good agreement with the analytical solutions. The vertical pressure predicted by FE model with a minimum value of 2.618 kPa and maximum intensity of 105.94 kPa in the vicinity of base of silo confirms the elephant foot phenomenon which is consistent with the work of Adam and Rotter (2001). Numerical results of hoop stresses are similar to and within the range of the models predicted by the Janssen equation. The friction coefficient has an influence on the hoop stress and reduction in the friction coefficient resulted in an increase in hoop stress. The analysis of horizontal and vertical pressures for the capacity of 600 m3 with for H/D ratio of 1–7 evaluated by FE simulations and that of calculated by analytical models found to be in good agreement for different H/D ratios. It is observed that the H/D ratio in the range of 3–4 provides optimum value of loads shared by wall and floor of FC silo for the given capacity. The silo constructed with the H/D ratio in the range of 3–4 provides optimal and economical design of FC silo.
Tài liệu tham khảo
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