Experimental Study On Vertical Loading Of Prefabr Icated Concrete Bucket Arch

Arch is a representative component of ancient Chinese architecture,and is also indispensable in modern antique buildings.However,due to the poor corrosion resistance,fire resistance,and durability of wood,and difficult repairs,bucket arches used in modern antique buildings all use concrete materials.After careful research on the installation process of bucket arches,it is found that the precast concrete bucket arch used in m odern antique buildings has different shapes except The load of its shared structure is also reduced accordingly.It is no longer the main load-bearing member,but still bears some vertical loads.At present,there is very little research on the vertical force failure of concrete bucket arches.In this paper,prefabricated concrete full-scale members were fabricated according to the actual engineering,vertical loading test research was carried out,and a finite element simulation model was established,and a single The directional and bidirectional seismic waves obtained the dynamic response of the bucket arch,revealed the weak parts of the bucket arch structure under the action of earthquake,and provided guidance for the actual project.In this paper,the vertical loading test research of prefabricated concrete bucket arch was carried out.A total of 5 sets of prefabricated concrete bucket arch full-size specimens were designed,one of which was an axial compression ratio of 0.4,and the loading point was 37.5cm away from the connection point of the bucket arch.The main parameters were the axial compression ratio and the change of the loading point.Several groups of axial compression ratios change to 0.3 and 0.2,and the load point distance changes to 30cm and 24cm,The results show that when the axial compression ratio is reduced,the damage of the bucket arch connection site will be more severe and faster,which shows that the axial compression ratio will affect the actual use of the bucket arch,so the axial compression ratio of the concrete column should be avoided as much as possible.much as possible.The finite element analysis software ABAQUS was used to simulate and analyze the test process.The plastic stress cloud map,steel bar stress cloud map,load-displacement curve,tensile damage stress cloud map and compressive damage stress cloud map of the connecting part of the bucket arch specimen were obtained.The results of the finite element analysis and the test are compared.The results show that the results of the finite element analysis and the test are in good agreement,which further verifies the accuracy of the finite element model.On this basis,one-way and two-way seismic waves are applied to the bucket arch model,respectively,to analyze the stress response of the bucket arch connection site under dynamic load.The results show that:under the action of one-way seismic wave and two-way seismic wave,the maximum peak value of acceleration of each component of the bucket arch connection part appears in the warp part;the displacement increases slowly in the bucket and the warp,and the growth rate of the ang and the head is accelerated;it is found that the bucket and the head are weak parts in the overall structure,so it is necessary to increase the appropriate amount of reinforcement or use steel fiber concrete to increase the stability of the bucket arch.