Research And Finite Element Analysis Of The Hole Reinforcement Technology Of The Coupling Beam Of Super High-rise Building

In the building structure,due to the need to consider the use of function and space aesthetic requirements,it is inevitable that there will be a collision between the installation of pipeline equipment and the building structure,so the pipeline equipment should pass through the structure.This situation often occurs in the small span to height ratio connecting beams of super high-rise buildings.In the construction,the casing should be embedded to form the small span to height ratio connecting beams with pipe holes,which not only damages the integrity of the structure,but also reduces the seismic performance of the structure.In this regard,the construction manual of concrete structure has made relevant provisions under the limit of the hole size of the continuous beam.However,when the actual engineering requires the hole size to be slightly larger than the limit condition,the reinforcement measures should be developed to ensure that its seismic performance meets the requirements.Therefore,this paper designed a reinforcement scheme to reinforce the hole,and established a finite element model for numerical simulation.This paper firstly describes the background of the development of connected beams,combs the reinforcement scheme of connected beams at home and abroad,defines the research content of this paper,and then designs the reinforcement scheme of connected beams through pipe holes.Secondly,the basic theory of ABAQUS and the main evaluation parameters of seismic performance are introduced.Thirdly,based on the existing test results,ABAQUS related parameters were selected to establish a model,and the simulation results were compared with the test results.Then,based on an example of a shantytown reconstruction project in Guiyang City,the seismic performance of small-span ratio pipe-perforated tunnel connecting beams in super highrise buildings under different reinforcement schemes is analyzed,and the bearing capacity at the weakened section of the mid-span opening is checked.Finally,in order to further study the law of seismic performance of small-span to high-ratio pipeperforated beam under single factor variation,five main influencing factors were selected,orthogonal test was designed,parameterized analysis was carried out and the bearing capacity at the weakened section of mid-span hole was checked.The results show that:(1)The simulation results are basically consistent with the test results in terms of the seismic performance evaluation parameters.The ABAQUS parameters selected in this paper have good reliability and accuracy.(2)The bearing capacity,hysteretic performance and ductility of the small span to height ratio of diamond-shaped reinforcement are better than others.Therefore,it is suggested that the diamond reinforcement scheme should be the first choice for the small span to height ratio of pipe-perforated connecting beams in super high-rise buildings.The proposed reinforcement scheme is consistent with the design drawings,indicating that it is feasible in practical engineering.(3)The span to height ratio and the effective height up and down of the hole are the main factors affecting the bearing capacity,deformation capacity and energy dissipation performance of the small span to height ratio of the pipe tunnel connected beam.The stiffness degradation rate slows down with the increase of span to height ratio and the decrease of the effective height up and down of the hole,while it first speeds up and then slows down with the increase of the concrete strength grade,but it is similar under the condition of different reinforcement diameters.This paper provides a reference for the design and analysis of the small span to height ratio pipe hole connected beam.