Abstract
Steel‐concrete composite beams with corrugated steel webs (CSWs) usually have concrete flanges that are prone to crack under tension, and an innovative posttensioned composite beam (IPCB) with CSWs has been proposed previously to overcome this shortcoming. Here, an IPCB with CSWs is manufactured and submitted to a flexural test to investigate its flexural behavior, based on which finite element (FE) models with different parameters are developed and analyzed using the ANSYS software. The effects of the span‐to‐depth ratio, concrete compressive strength, initial effective prestress, width of the upper concrete flange, and yield strength of the steel tubes on the flexural behavior of the IPCBs with CSWs are discussed. Numerical results show that the span‐to‐depth ratio of the beam and the yield strength of the steel tube have a considerable effect on the ultimate load‐carrying capacity of the IPCB, which increases by 48.2% when the depth of the CSWs is increased from 240 to 400 mm and by 21.8% when the yield strength of the steel tubes is increased from 295 to 395 MPa. The plane‐section assumption is unsuitable for IPCBs. Almost all the unbonded posttensioning strands in the beams yield for the specimens at ultimate state. The normal stress is distributed unevenly across the width of the upper concrete flange, and the maximum shear lag coefficient is 1.17. Based on the numerical results, a calculation method is established to evaluate the bending moment resistance of an IPCB with CSWs. Comparison shows that the theoretical results in accordance with the proposed method agree well with the numerical results.
Highlights
Bridge engineering has seen the widespread use of steelconcrete composite beams with corrugated steel webs (CSWs), which have the advantages of low deadweight and good load-carrying capacity
Because the maximum shear lag coefficient of the calculated innovative posttensioned composite beam (IPCB) was 1.17, the adverse influence of the stress concentration near the connections of the CSWs and concrete flanges should be considered in the flexural design
(1) An IPCB with CSWs was subjected to a flexural test, and the experimental results showed that flexural failure occurred eventually, with the IPCB presenting excellent flexural behavior
Summary
Bridge engineering has seen the widespread use of steelconcrete composite beams with corrugated steel webs (CSWs), which have the advantages of low deadweight and good load-carrying capacity. Chen et al [10, 11] proposed a new type of composite box girder with CSWs and trusses, and their experimental results showed that this type of composite beam has higher yield load and smaller deflection compared with those without concrete-filled steel tubes. He et al [12] investigated the static and dynamic behavior of a prefabricated composite box girder with CSWs and concrete-filled steel tube slabs, and it is revealed that the girder possessed a sufficient safety margin. A reduced-scale IPCB was subjected to a flexural experiment, and FE models were developed to investigate the flexural behavior of IPCBs
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