Research on Seismic Internal Force Adjustment of Beams and Columns in Frame Structures
Prior to the adjustment of shear forces at the ends of frame beams,it is essential to first calculate the internal forces at the control sections and subsequently adjust the bending moments at the beam ends to enhance structural safety.The adjustment of seismic internal forces in beams and columns of frame structures is a challenging and error-prone aspect during manual calculations of a single frame.To address this issue,this paper summarizes the basic steps and methods for calculating the seismic internal force adjustment of frame beams and columns based on specific calculation examples.Errors frequently occur in determining the sign of bending moments at the ends of frame beams,the most unfavorable combination of bending moments,and the determination of the maximum design shear force.These errors are corrected through illustrative examples.The sequence for seismic internal force adjustment of frame columns follows the principle of"strong columns and weak beams"first,followed by"strong shear and weak bending."When performing the"strong columns and weak beams"adjustment for middle columns,due to the need to simultaneously consider the bending moments at the left and right ends of the joints and the linear stiffness of the columns above and below the joints,the calculation is substantial.A simplified method using an increased column-end bending moment factor is adopted,which is straightforward,with minimal errors,and equally applicable to side columns.
Frame structureInternal force adjustmentIncreased column-end bending moment factor
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