| Girder bridge with corrugated steel webs which combines corrugated steel with concrete greatly enhances the strength, stability and material’s service efficiency of bridge construction. It is a new form of bridge structure which is worthy to be popularized. Corrugated steel webs almost bear all the shear distributed in the bridge section. Therefore, it is significant to study the shear behavior of webs. Using the Ansys finite element analysis model verified by experiments, this paper studies the elastic shear buckling strength and ultimate shear strength of trapezoidal corrugated steel webs, main contents as following:(1) Basing on the model tests of corrugated steel webs in the laboratory, and considering the boundary conditions of experimental model similar to engineering practice, a corrugated steel webs finite element analysis model was built. The results of the finite element analysis were in good agreement with the test results.(2) Using the finite element model after verificating, taking two kinds of boundary conditions including simply-supported and clamped edges into consideration, the elastic shear buckling strength of webs was simulated and analyzed. The numerical results were compared with the calculated values by eight kinds of elastic shear buckling strength theoretical formulas; Through the comparison, an amendment of elastic shear buckling strength theoretical formulas is proposed.(3) Many ultimate shear strength theoretical formulas recorded in literature are pointed out to be based on the boundary conditions of simply supported on four edges, and there is a deviation when comparing with the boundary conditions of webs in practical engineering. The practical engineering boundary conditions are located between simply-supported and clamped edges, the calculated values of ultimate shear strength may be conservative. Therefore, seventy six finite element models based on the experimental boundary conditions were built, taking material nonlinear, geometric nonlinear and initial imperfections of webs into consideration, and using nonlinear buckling analysis, through data fitting and comparing with two formulas in literature, the web ultimate shear strength theoretical formula that complies with the experimental boundary conditions is proposed.(4) Taking the web thickness, and web height, web corrugation height and web length as parameters, thirty one finite element models were built, the influence degree of four parameters’variation on the ultimate shear strength and bearing capacity was studied, and some corresponding conclusions are obtained; Meanwhile, some design suggestions on web shear strength are proposed according to two situations including web shear buckling failure and shear yield failure.(5) Using the proposed elastic shear buckling strength amended formula and ultimate shear strength formula, the shear strength calculation of webs in the PoHe Bridge was conducted, and the finite element model verified by the experiments was built. The proposed formula solution correlates well with the finite element solution. It verifies the rationality of the two proposed formulas and expounds the calculating method of web elastic shear buckling strength and ultimate shear strength.This paper has studied the shear behavior of trapezoidal corrugated steel webs, the conclusions and two proposed formulas can be used as guidance for the design of web shear strength in practical engineering. |
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