D值法是位移法的一种,它是目前计算多、高层框架在水平荷载作用下内力时应用得最广泛的一种近似计算方法.运用D值法计算不规则框架内力时,由计算出各层框架柱两端弯矩后,依据节点弯矩平衡条件,按照节点两端框架梁线刚度分配柱端弯矩.考虑到在多跨框架体系中,由于节点处框架梁端弯矩不但受到梁线刚度比的影响,同时也受到框架梁远端节点变形的影响,对于节点两边梁约束差别大的框架梁,采用该方法时误差太大,提出一简化方法将各层框架梁采用连续梁模型,考虑各个节点间的相互影响,这将提高按D值法求解框架结构内力的计算精度.%D-value method is a kind of displacement method. It is an approximate calculation method that is widely used to calculate the member force of multiple-story frame structures under horizontal loads. After obtaining the moment of column by D-value method, in the normal D-value method, the column-end' s moments are distributed to beams to satisfy the joint moment equilibrium according to linear stiffness ratio of beams. However, for a irregular frame structure, not only do the values of beam' s moment depend on the linear stiffness ratio, but the deflection of the joint on the other end of a beam impacts it as well. This method will lead to large inaccuracy, if two beams of connected by a joint have large restraint difference. So a new method was proposed by modeling each story' s girder into a continuous beam. It will improve the accuracy of frames internal force calculation, in which each beam is considered as a span of a continuous beam involving the interaction among joints.
展开▼
