Influence Of Detailed Formations On Seismic Resistant Behavior Of Reinforced Concrete Box Culvert

With the further exploitation of underground space and continuous increasingconstruction of underground structures, performance-based seismic design of undergroundstructures and its security evaluation is more and more important and urgent. Obviously,we should pay more attention to the shallow-embedded reinforced concrete boxculvert of seismic behavior and anti-seismic performance design because its seismicresponse is more significant under less soil on the top.To research the shallow-embedded reinforced concrete box culvert of seismicbehavior and ensure reinforcement yieldingof lateral wall earlier thanslab’s subjectedto earthquake action, the discrete modeling of reinforced concrete box culvert’s scalespecimens under low-cyclic reversed loading is proposed by Final-v11. In this case,concrete is modeled by three-dimensional solid elements while the reinforcing steel ismodeled by truss elements, the connectivity between concrete and reinforcing steel issimulated by quadrilateral slide elements. Comparative analysis of numericalsimulation results and experimental results are carried out in aspect of hystereticbehavior, energy dissipation capacity, failure position and steel strain. The numericalsimulation results agree with the experimental data, reinforcement yielding anddestroyed conditions of concrete structures are also well reproduced. The case studyshows that the numerical simulation method for reinforced concrete box culvert iscorrect and the bond-slip relationship between concrete and reinforcing steel is alsoreasonable.Subsequently, based on four variable parameter models, research on seismicbehavior of strengthening reinforcement of slab and lengthening haunch dimensionhorizontally is discussed, both of two methods can improve energy dissipationcapacity of box culvert and ensure reinforcement yielding of lateral wall earlier thanslab’s subjected to low-cyclic reversed loading. Some useful conclusions in this thesiswill provide a theoretical basis for the design of reinforced concrete box culvert.Finally, this paper discussed the analytical results of shallow-embeddedreinforced concrete box culvert with2-D and3-D FEM, which shows that lengtheninghaunch dimension horizontally is an effective detail of seismic design in improvingenergy dissipation capacity of box culvert and ensuring reinforcement yielding of lateral wall earlier. Meanwhile, the analytical method that the result of2-D FEMapplied to3-D FEM is also efficient, which can be referred to in solving similar3-DFEM problems.