The purpose of this paper is to separately analyze the additional shear force caused by the tilt of the slab in the absence of the initial crack and evaluate its effect on the force of the screw. The calculation analysis was performed using the structural general analysis program ANSYS and checked with SAP84. After the fracture occurs, the chemical components and fractures of the fractured high-strength bolts are analyzed. When the wind-resistant column is installed, the lower end of the wind-resistant column is supported by a wedge-shaped pad, which is temporarily fixed after positioning adjustment, and then The pad and the foundation are filled with a non-stretching mortar. After the non-stretching mortar reaches the required strength, the wedge block is removed and the gap is filled with the non-retractable mortar. Finally, the bolt is tightened. It can be inferred that the tilt of the pad should be generated before the wind-resistant column is in place and the screw is tightened. It is considered that the component of the vertical force transmitted from the wind-resistant column along the backing plate is the shearing force of the bolt (ignoring the bond between the backing plate and the non-stretching mortar). The process of tightening the bolt can be divided into two stages. Since the screw is vertical and the pad is inclined before tightening the bolt, there is also an angle a between the nut and the pad. When the nut is tightened, the right end is in contact with the pad to transmit pressure, and the nut bears the support force R of the pad. The nut and the bolt rotate counterclockwise under the action of the external torque of 90 and R. This is the first stage, until the cumulative angle of the nut reaches a, parallel to the pad and in close contact with the end of the first stage. At this stage, the tension of the screw and the angle of the end (nut) change simultaneously. The second stage nut has been in close contact with the pad and its corner is no longer changed. The tension applied to the screw continues to increase as the nut is tightened until the pre-tension p2 required by the design is reached. Calculate the basic assumed amount, ignoring the influence of the thickness of the nut and the pad when analyzing the screw bending, assuming that the shear force is borne by the bolts on average, so that the single bolt that can be destroyed is the research object.
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