Research on TMD collision damping based on two-way dense ribbed cavity building cover

Bidirectional dense ribbed cavity floor cover is a new type of floor cover system suitable for large span and large space structure, which has the advantages of light structural deadweight, high stiffness, convenient construction, short construction period and relatively low cost. In the article, in constructing the calculation model equation of motion of two-way dense-ribbed cavity building cover, the deformation deflection and internal bending moment of two-way dense-ribbed cavity building cover are solved by the proposed plate method for the equation of motion. The semi-active control vibration damping device applied to bidirectional dense-ribbed cavity floor cover is constructed by combining with TMD, and the TMD dynamics model is constructed and the parameters of bidirectional TMD vibration damping device are optimized by genetic algorithm. The cross-section bending moments in the mid-span region of the bidirectional dense-ribbed cavity floor cover differ from the reference values within 3.5%, and their maximum deflection values are between 7.95 mm for the solid slab and 14.26 mm for the dense-ribbed floor cover. In the low wind speed interval [40,64] m/s, the average energy maxima of the main structure of the two-way dense-ribbed cavity floor cover are 0.33 times that of LTMD1 and 0.26 times that of LTMD2. The installation of semi-active control TMD device in the bidirectional dense-ribbed cavity building cover can effectively improve the collision vibration damping effect of this structure, and provide reliable technical support for maintaining the safe and stable operation of the building structure.