Abstract
The structural systems such as road bridge beam systems (span superstructure) or beam systems used in high-rise buildings with precast pre-stressed reinforced concrete might be subjected to the load higher than the calculated load of the design process. In the process of operation the internal forces of the beams reach to a certain value, the section stiffness in elements will be changed. The change in section stiffness will lead to redistribution of internal forces in the whole system. However, that has not been included in the design process. The paper presents nonlinear deformation analysis of precast pre-stressed beam system used in road bridge span superstructure or high-rise buildings using nonlinear model of materials according to Russian construction codes to build the relationship between internal forces and section stiffness. From the calculation results, some comments will be recommended about increased load capacity in comparison with the results obtained from analysis using linear model of material.
Highlights
Today, in Vietnam for reinforced concrete structures, the design based on the construction standard TCVN 5574-2012 [1] which recommends considering plastic deformation of concrete and reinforcement or linear elastic material assumption
This paper presents a calculation method that can explain higher load bearing capacity during operation process. This calculation method includes the following main steps: Nonlinear deformation analysis for each beams using nonlinear material models of Russian codes SP 52-101-2003 [2], SP 52-102-2004 [3]; Using the results of the nonlinear deformation analysis for each beam, in particular, using the diagram of the section stiffness depending on the internal forces appearing in each beam into the overall of beam system using structural analysis software of the FEM method
The results of the above example using nonlinear deformation analysis showed that the evaluation criterion of above mentioned "limit state including the stress-strain state before fracture" allows explaining higher load capacity of the beam system compared to evaluation criterion according to the common limit state
Summary
In Vietnam for reinforced concrete structures, the design based on the construction standard TCVN 5574-2012 [1] which recommends considering plastic deformation of concrete and reinforcement or linear elastic material assumption. In order to design and evaluate the load capacity of precast pre-stressed reinforced concrete beams, it has been carried out to calculate according to the common limit state theory for determination the caculated values of internal forces Mc and Qc (caculated bending moment and shear force) in beams under the effect of different types of loads. This paper presents a calculation method that can explain higher load bearing capacity during operation process This calculation method includes the following main steps: Nonlinear deformation analysis for each beams using nonlinear material models of Russian codes SP 52-101-2003 [2], SP 52-102-2004 [3]; Using the results of the nonlinear deformation analysis for each beam, in particular, using the diagram of the section stiffness depending on the internal forces appearing in each beam into the overall of beam system using structural analysis software of the FEM method. Consider that the load (here is the live load) gradually increases
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