Principal Technological Problems In Compilation Of Standard Drawings For Concrete Composite Slab With Precast Ribbed Panel

In the compiling process of the standard drawings, calculation method and accuracy of expression appear. Technological Problems during the Compilation of Concrete Composite Slab with Precast Ribbed Panel are analysed. There are two aims for doing this of standard drawings. One is to provide certain reference, and the other is to help part of the atlas user to understand the calculation process of atlas. Solutions of the problems are provided too.Based on the related calculation method of current national standards and calculation of composite slab from 3.0 m to 9.0 m (nearly 200 pieces of slab), we analysed the principal technological Problems. Firstly, selection methods of the slab was determined; Secondly, the two-phase mechanical characteristics of composite plate is studied; Thirdly the calculation method to verify "reliable support" are propose; Fourthly, the controlled tension stress of pre-stressed wire is confirmed; Then the structure performance testing method was discussed and determined; Finally, the problems caused by multiple-rib slab are solved.Analysis shows that using the load design value which is calculated by the section characteristics of composite slab as the basis to select the bottom slab is reasonable. It can consider all of the load combinations, and do not cause the amount of reinforcement larger. The controlled tension stress of pre-stressed wire can be confirmed as 0.65/ptk.If the design of composite slab is based on two-phase mechanical characteristics, three parameters should be control to make composite slab better satisfying the requirement of crack and deflection. The span to depth ratio should be adjusted to 25-30, the ratio of the sectional resistance moment of the composite plate and the bottom should be adjusted to 2.42～3.19, ratio of the dead load of composite slab to the total standard load of the engineering should be adjusted to 0.24～0.49; When the support is not fully supported and the tensile stress under the bottom plate calculated by two-phase mechanical characteristics is less than or equal to the tensile stress calculated by one-phase mechanical characteristics, the un-full support can be considered as reliable support; The structure performance testing shall be carried out according to the composite plate structure, and the structure performance testing can be passed over if some other testing are taken; The allowing load of multiple-rib slab should be defined as the minimum load of all the allowing load of single-rib slab. The appendix of this thesis contains three typical calculation examples of composite slab to illustrate the calculation process.