In order to clarify the strengthening mechanism of the slab culvert strengthened by corrugated steel plate and the influence of different design parameters on the bearing capacity and stiffness of the culvert,finite element models(FEMs)were established using a two-step method based on the physical project of slab culvert with a span of 4m strengthened by corrugated steel plate.These FEMs takes into account the secondary force of the culvert and the interface contact of different components.These FEMs were used to analyze the influence of original culvert damage degree,interface treatment method,waveform,filling layer strength and thickness on the bearing capacity,stiffness and failure state.The stress system of corrugated steel reinforced slab culvert was also analyzed.The results show that the stress of the corrugated steel plate in the design state is mainly produced by the lateral pressure of the unhardened concrete.After the corrugated steel plate is used to strengthen the slab culvert,the bearing capacity is increased by 25-85 times,and the stiffness is increased by 26-136 times.The processing method of the joint surface and the thickness of the concrete filling layer have a greater influence on the bearing capacity and stiffness,while the corrugation and concrete strength have less influence on the bearing capacity and stiffness.The corrugated steel plate is not the main part to bear the load,but it provides enough support for the structure.This makes the structure change from slab failure to multi-position failure,and the bearing capacity and ductility of the structure are further improved.
关键词
盖板涵加固/波纹钢/有限元模型/参数分析/受力机理
Key words
slab culvert strengthening/corrugated steel plate/finite element model/parameter analysis/strengthening mechanism
维普
万方数据