A SIMPLIFIED P- EFFECTS ANALYSIS APPROACH FOR TALL BUILDING STEEL FRAMES WITH SEMI-RIGID CONNECTIONS
-
摘要: 介绍一个半刚性连接高层钢框架P-Δ效应分析的实用简化方法。以部分框架为分析子单元，用变刚度的转动弹簧模拟梁柱节点连接的半刚性，建立了考虑P-Δ效应的半刚性连接高层钢框架内力和位移计算的无迭代简化公式。算例表明，梁柱连接的半刚性确实降低了钢框架的抗剪刚度，明显增加了结构的水平位移和P-Δ效应，应当在高层钢框架的P-Δ效应分析中考虑半刚性连接的影响。该方法不仅简单实用，便于手算，而且精度较高，可供工程设计人员在半刚性连接高层钢框架设计时使用。影响半刚性连接高层钢框架P-Δ效应的主要因素是柱的抗剪刚度、梁与柱的线刚度之比、半刚性连接的类型和相应的连接刚度系数α值。Abstract: A practical yet simplified method for P- effects analysis of tall building steel frames with semi-rigid connections is presented. By taking partial frame as an analytical subassembly element and using a rotation spring which has variable bending stiffness to model semi-rigid of beam-column connection, this paper derives a simplified non-iterative inner force and lateral deflection computation formula taking into account P- effects for tall building steel frames with semi-rigid connections. The numerical examples show that semi-rigid of beam-column connections indeed decreases the lateral shear stiffness of steel frames and obviously increases the horizontal displacement and P- effect on the steel frame. Therefore, the influences of semi-rigid connection should been considered in P- effects analysis of tall building steel frames. The presented method is not only relatively simple, practical and easily applicable to manual computation but also has a rather high accuracy, and can be used by the engineers in preliminary design for tall building steel frames with semi-rigid connections. The main effect factors of P- effects in a tall building steel frame with semi-rigid connections are the column shear stiffness, the proportion of the beam liner stiffness to column liner stiffness as well as the different form of semi-rigid connections and connection rigid coefficient .
-
Keywords:
- steel frames /
- P-Δ effects /
- simplified analysis /
- semi-rigid connections /
- rotation spring /
- shear stiffness
-
下载:
