| The corrugated steel web composite trough beam is one of the typical downbearing axial structures.It has the characteristics of small height-span ratio,low building height,light weight,high section utilization,excellent mechanical properties,and economical and beautiful characteristics.It has a wide range of application prospects in areas such as urban and urban elevated.The fatigue performance is basically in a blank state.Here through the fatigue performance test research of a corrugated steel web combined trough test beam,the maintenance work is mainly as follows:(1)Designed and processed a corrugated steel web composite trough beam,and jointly referred to the ultimate bearing capacity calculated by the ABAQUS finite element numerical model and the equivalent calculation of the fatigue load of the highway—Class I lanes.The upper and lower limits of the fatigue load were drawn up.The values are 100 k N and 20 k N respectively.Through the fatigue test,the fatigue performance of the test beam in the highway field application is studied.(2)The fatigue performance test of the test beam is carried out.During the whole process of the test,the change in the compressive strain of the concrete top slab and the change in the deflection of the mid-span are used as the indicator to study the fatigue effect on the composite groove test of the corrugated steel web.The results show that the mid-span deflection and roof strain increase significantly in the early stage of the fatigue test,and then grow approximately straight and slowly.They are in the second stage of the normal reinforced concrete beam test beam throughout the fatigue test process,indicating that it is better Fatigue performance can better meet the requirements of highway applications.(3)Through the comparative analysis of the corrugated steel web structure,compared with the box-shaped or I-shaped composite section,due to the structural characteristics of the corrugated steel web composite trough beam under-bearing structure and the normal use state,the corrugated steel web steel beam The stress level of the lower flange is in a low state,and the probability of fatigue failure near the corner of the corrugated web and the weld of the lower flange steel plate is relatively small.The test results of the normal stress of the lower flange of the corrugated steel web steel beam confirms that the stress level is relatively low.(4)Aiming at the fatigue failure position of the corrugated steel web composite structure,which is mainly the weld near the corner of the corrugated web,the equivalent structural stress method is adopted,and the Fe-safe fatigue professional analysis software and the ABAQUS finite element software are used to establish a welded joint.Numerical model of corrugated steel web steel beam segment to analyze the structural stress distribution along the weld line.Through the parameter analysis method,the influence of the corner radius and the corner angle on the stress distribution of the weld line structure is studied,and the fatigue failure point at the corner weld is used to characterize the fatigue performance of the corrugated steel web steel beam in the pure bending state.The simulation calculation shows that the maximum structural stress of the welding line of the lower flange of the steel beam and the welding line of the web decreases with the increase of the corner radius,but the two have no obvious trend of convergence with the increase of the corner radius.It is recommended that the actual basis be used.A reasonable corner radius needs to be selected.The maximum structural stress at the weld line of the lower flange of the steel beam increases with the increase of the turning angle,and the maximum structural stress of the web weld line decreases with the increase of the turning angle.The curve of the two changes is 50 at the turning angle Cross near.According to the fatigue theory,when the turning angle is about 50°,the fatigue performance of the entire weld is the best. |
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