Study on Effect of Load Contact Area on the Strength of Partially Loaded Carbon Fiber Reinforced Concrete Circular Cylindrical Shells

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The main purpose of this study is to investigate, both theoretically and experimentally, the effects of contact area of vertical partial load on the strength of carbon fiber reinforced concrete (CFRC) circular cylindrical shells supported by pins at the four corners. The load carrying capacities, crack strength and the nonlinear mechanical characteristics of roof-type shells were studied for different load contact areas. Two kinds of numerical models were used in the study. One was Square Type, the load contact shape of the loaded portion of which was square, and the other was Circular Type, the load contact shape of the loaded portion of which was circular. The former is a normal model with the same material conditions and same shell thickness and was analyzed only numerically, while the latter is a model that corresponds to shell specimens and was investigated both numerically and experimentally. The theoretical study was conducted using the material and geometrical nonlinear finite element analyses considering concrete cracking and tension stiffening effects. Shell elements employing a layered discretization through the thickness were adopted. The Square Type was investigated with five different kinds of side-lengths, while the Circular Type was investigated for three different kinds of diameters. The experimental study was conducted on small-scaled CFRC shell specimens. Partial load was applied vertically at the center of shell surface up to the final failure. The measured load carrying capacities and nonlinear behaviors at the ultimate failure states of CFRC shells were compared with the theoretical values and discussed.

Study on Effect of Load Contact Area on the Strength of Partially Loaded Carbon Fiber Reinforced Concrete Circular Cylindrical Shells

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