半刚性钢框架的内力分析

采用二阶非线性分析方法分析和设计半刚性钢框架，包括连接的柔性以及构件的几何非线性的影响，提出了半刚性钢框架中梁柱单元刚度矩阵和半刚性梁的单元刚度矩阵；推导了半刚性梁在集中荷载，均布荷载，线性荷载作用下的固端弯矩的求解公式；连接的柔性对无支撑框架的侧移有很大的影响，设计时通过变化连接的刚度以平衡梁的跨中和端弯矩。

THE ANALYSIS OF INTERNAL FORCE OF SEMI-RIGID STEEL FRAME

A second-order nonlinear analysis is presented for the design of a semi-rigid steel frame, which includes the effects of the flexibility of the connections and the geometric nonlinearity of the members. The beam-column element stiffness matrix and the semi-rigid beam element stiffness matrix are given. The fixed-end moments equilibrium for the semi-rigid beam holds for concentrated, uniform, and linear loads on members. In the semi-rigid steel frame, the effective column-length factor must be considered. The connection flexibility has a significant effect on the drift in unbraced frames, it is shown that economical designs may be realized with semi-rigid connections by a variation of connection stiffness that balances the span and end moments in a beam.