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| The mechanical behavior and effects of reinforced concrete members under different loadings |
| WANG De-bin，LI Hong-nan |
| Faculty of Infrastructure Engineering; Dalian University of Technology; Liaoning Dalian 116024，China |
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Abstract Based on Beam with Hinges Element in OpenSees, the linear elastic shear restoring force model that defined on section is adopted. The zero length section element with bond-slip material is introduced to simulate the bond-slip at the end of element. Meanwhile, the geometric non-linearity caused by the P-D effect is taken into consideration. The Mohle-Kunnath constitutive model which is able to accurately simulate the low-cycle fatigue damage and cracking phenomenon of steel is used to analysis the mechanical property of component under different loading history. This paper studies the mechanical properties of component under monotonic loading, asymmetric cyclic loading and symmetric cyclic loading. Under different cycle numbers, the mechanical properties of component with symmetric and asymmetric loading and the changing characteristics of steel strain with displacement loading history are further analysed. The results indicate that under cyclic loading conditions stiffness degradation and strength degradation phenomena of the reinforced concrete frame columns are obvious. The damage of the component gradually exacerbates with the decrease of shear span ratio and the increase of shaft pressure ratio, while the damage is more obvious with the increase of the cycle numbers. The strain of reinforced materials change significantly with the increase of cycle numbers, the stiffness degradation and strength degradation become more obvious with the increase of axial compression ratio and the decrease of shear span ratio, the strain of steel also increase to some extent.
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Received: 09 December 2011
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2013, Vol. 32 
