Research and Comparative Analysis on the Calculation Method of Shearing Resistance of Self-tapping Screw on Metal Roofs
Regarding the calculation of shearing resistance of self-tapping screws on metal roofs,the design standards of multiple countries are studied,and the standard systems of each country are compared and analyzed,and the deficiencies of the national standard(GB 50018-2002)are pointed out.The research results indicate that appropriate formula based on different failure modes should be selected for the calculation of the shear resistance of self-tapping screw connecting components.The national standard is only applicable to pressure bearing,tilting and pull-out failures.For end shear failure and fracture failure of the net section of the base steel plate,reference can be made to the Australian standard(AS/NZS 4600-2018)and the European standard(EN 1993-1-3-2006).The shear failure of self-tapping screws should be determined by testing and quality should be guaranteed by distributors.The bearing capacity calculation of self-tapping screws in the national standard adopts the load and resistance factor design method(LRFD),and if necessary,the safety factor can be increased to avoid brittle fracture.
metal roofself-tapping screwshearing resistancefailure modeload and resistance factor design methodsafety factor
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