Beam and column splice bolt shear forces with bidirectional bending
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Pilarin ja palkin jatkosliitoksen pulttien leikkausvoimien laskeminen kahteen suuntaan taivutetussa liitoksessa
In the literature, the designing of the rolled or welded, doubly symmetrical I- and H-profile bolted splice is usually presented with a load combination, which includes axial load, shear in one direction and bending in respect of strong axis. Because there often exists a load combination with biaxial bending simultaneously, the design method for calculating bolt shear forces in this situation is needed. To design the joint reliable, the distribution of the forces in the joint must be known well. In the nonbearing type joint, the forces of the splice are usually supposed to be distributed in the ratio of the cross-section stiffnesses. With this method, generally acceptable results have been achieved for the joint member stresses. In the bearing type joint, the distribution of the forces for the bolts and splice plates is not as clear as with the non-bearing type splice. In this research, the stiffnesses of the splice members has been used for calculating stresses also in the bearing type splice. This research belongs to the project developing biaxially loaded splice design program in Sweco Rakennetekniikka Oy. It consists of the theoretical calculation and the finite element analysis (FEA), where the calculation results are compared. With the FEA, the distribution of the stresses can be studied from the beginning of the stress test, with all load combinations. The results of the research are mainly in-line with the FEA. A design program for calculating profile and splice plate stresses and bolt shear forces for biaxially loaded splice was mainly achieved, including both non-bearing and bearing type splice. For achieving an adequate reliability for the results of the calculation, and in some cases, more accurate results, additional research and tests with different types of the splices are needed.