Computation of unified bending capacity for flexural members of reinforce concrete bridge
When the partial coefficient approximate probabilistic limit state method is used to design the flexural members of reinforce concrete(RC)bridges,there are phenomena of splitting and isolating different design conditions and limit states,which leads to that different situations and states can not be compared quantitatively,and destroys the inherent unity of the design method to a certain extent.A unified flexural capacity framework was proposed,the calculation principle of the unified flexural capacity was established for flexural members of RC bridge,and the corresponding calculation formula of the unified flexural bearing capacity was derived.A new internal connection and quantitative difference between different limit states under different design conditions of the RC bridge flexural members designed based on the code were explored,so that the intrinsic unity of the partial coefficient approximate probabilistic limit state design method could be characterized.The results show that the different limit states of RC bridge flexural members under different design conditions can be unified in the flexural capacity under the established framework,and the transverse quantitative comparison between them can be realized.The design checking calculation under the presented framework of unified bending capacity can achieve the requirements of the checking calculation of the code only by one step comparison.It can also help expose potential and low risks of relative strength reserves for some limit states,so as to realize the beneficial supplement and perfection for the design checking calculation of the partial coefficient approximate probability limit state method.
RC bridgeflexural memberpartial coefficient approximate probability limit state design methodunified bending capacitydesign checking