Research on Crack Calculation Method of Pretensioning Prestressed Concrete Composite Beams

According to the stress principle of prestressed concrete composite flexural members, the paper put forward the calculation method of the steel stress about pretensioned prestressed concrete composite beams in service stage, which takes into account the two stages of stress in construction stage and service stage, filling the gap in the current standard in China. The paper also revised the calculation method of crack width in the service stage about prestressed concrete composite beams in the code. Referring to the relevant provisions of American ACI 318 Code on controlling the cracks of prestressed components through nominal tensile stress, based on specific projects, the recommended nominal tensile stress control values for different crack limits of pretensioned prestressed concrete T-shaped composite beams under the Chinese code system were proposed.