框架结构梁柱抗震内力调整研究  

Research on Seismic Internal Force Adjustment of Beams and Columns in Frame Structures

作　　者：汤繁华[1] TANG Fanhua

机构地区：[1]湖南工业大学土木工程学院,湖南株洲412007

出　　处：《重庆建筑》2024年第7期61-64,共4页Chongqing Architecture

摘　　要：框架梁端剪力调整之前,应先计算控制截面内力,后进行梁端弯矩调幅,使结构更加安全。框架结构梁柱抗震内力调整在手算一榀框架计算中是一个难点,且容易出错。为解决这一问题,可根据具体计算实例,归纳出框架梁柱抗震内力调整计算的基本步骤和方法,计算出在框架梁端弯矩正负号判别、弯矩最不利组合、最大剪力设计值确定等位置容易出现错误,并结合实例予以纠正。框架柱的抗震内力调整顺序是先进行“强柱弱梁”的调整,再进行“强剪弱弯”的调整,中柱在进行“强柱弱梁”的内力调整时,因其需要同时考虑节点左右梁端的弯矩,节点上下柱的线刚度,计算量大,采用柱端弯矩增大系数的简化计算方法,简单明了,误差很小,对边柱同样适用。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.

关 键 词：框架结构 内力调整 柱端弯矩增大系数 

分 类 号：TU375.4[建筑科学—结构工程]