Abstract:
The difficulties and hot issues in solving the dual control technology solutions are focused on current rail transit services. A new type of three-dimensional vibration reduction bearing is thusly proposed, which is composed by a cylindrical spiral spring and a laminated lead rubber. Research on its mechanical properties, such as vertical stiffness, ultimate bearing capacity, horizontal frequency correlation, and ultimate compression shear capacity, is conducted by testing. Theoretical calculation models for its horizontal and vertical mechanical properties are derived, which is verified by the comparison with the experimental data. Based on finite element analysis, the control effect of the building structure designed with this bearing is explored in actions of subway and seismic waves. Results show that: the bearing proposed can achieve bidirectional decoupling control design, and has good horizontal and vertical mechanical performance. The hysteresis energy consumption is full and stable, with little correlation between frequency and loading times. The equivalent damping ratio and ultimate compression shear displacement in the horizontal direction reach 8% and 48.75 mm, respectively. The theoretical model can reflect the bidirectional mechanical behavior, and the average error with the experimental data is only 3.96% in horizontal 15 mm compression shear testing. The bearing proposed can change the dynamic characteristics and attenuate the bidirectional dynamic response. The vertical acceleration and horizontal floor shearing force of the structure decrease by 94% and 55%, respectively, in vertical subway and horizontal seismic actions.