【作者】 尹志刚；

【导师】 周瑞忠；

【作者基本信息】 福州大学 ， 水工结构工程， 2003， 硕士

【摘要】 采用焊接刚性节点的钢框架因节点延性较差容易发生脆性破坏，而半刚接钢框架因节点具有较强的耗能能力可以抵抗一定的地震荷载，同时还可以减少斜撑的数量及节点用钢量，这使得半刚接钢框架成为一种经济、可靠的选择。但由于半刚性连接的复杂性和多样性，在钢框架的分析和设计中，还是将框架的梁柱连接假设成为完全的刚接或理想的铰接。对连接性能的这种理想化假设简化了钢框架的分析和设计过程，却不能反映结构工作的实际情况，计算结果误差很大，有时甚至会得到错误的结论。 我国钢结构设计规范(2001，10送审稿)中提到了半刚性连接的概念，但规范对进一步如何实现半刚性连接的设计、理论、要求、标准和实施步骤均未做出说明，因而事实上也无法具体执行。本文的目的就是为半刚性连接钢框架的设计提供一种既符合工程实际又简便易行的计算方法，供规范使用过程的补充、延伸或参考；同时，也将促进半刚性连接钢框架设计技术的发展，为提高结构安全性能、节省工程成本发挥应有的作用。 本文首先介绍了常见的几种应用较为广泛的梁柱连接弯矩转角关系模型，在分析比较的基础上，选用Richard—Abbott函数模型作为外伸端板连接弯矩转角关系模型，通过对34个外伸端板连接的实验数据与回归分析得到的参数比较可知，经回归分析得到的此模型参数与实验数据符合较好。然后用弹簧表征连接点的转动刚度，根据梁的转角位移方程推导出半刚性连接的刚度矩阵，在单元刚度矩阵中考虑了节点柔性、几何非线性和剪切变形的影响，并对固端力进行了修正，最后用增量迭代法编制有限元程序进行计算和分析。 通过对几个例子计算结果的分析表明，半刚接与刚接相比会使钢框架的侧移、柱脚弯矩增大，而使梁端弯矩减小，对无支撑框架尤为明显，支撑框架能够有效地减小节点半刚接的影响。同时，半刚接对二阶效应、剪切变形有放大作用。根据计算结果的统计分析，提出可以不考虑半刚性影响的节点刚度范围，并对考虑半刚性的钢框架的内力和位移给出修正系数，供工程设计参考。更多还原

【Abstract】 Steel frame with welding joint easily occur brittle collapse because of having alow ductility at joints．Then，a semi-rigid connected steel frame has large the energyabsorption capacity which can resist dynamic loads and the using steel qualities ofbracing system and joints are small．So adopting a semi-rigid jointed steel frame iseconomical and stable．But for semi-rigid connections are complex and variable，inconventional analysis and design of steel structures，It is usually assumed that theconnections between columns and beams are either rigid or pinned．The analysis ofsteel frames adopting the assumption can simplify the procedure of analysis anddesign，but cannot precisely reflect structural practical circumstance and the errors ofcalculating results are large，even，get incorrect conclusions． Semi-rigid connection was referred to in Chinese Code for Design of Steel Structures(2001，10)，however，it isn’t specified how to apply semi-rigid joints in design．In fact it cannot be carry out．The purpose of the paper give a calculating method that accords practical engineering and easily put into effect．Worthwhile it isgoing to promote the development of semi-rigid jointed steel frame in design and heighten structural stability． In the paper，at first some commonly employed methods for the modeling of connection behavior are introduced．Richard．Abbott function modeling of connection is adopted for extended end plate bolted connection．By the 34 test data comparing to regression analysis indicate Richard-Abbott function modeling of connection represents an excellent fit to test data．Then after a semi-rigid joint behavior can be modeled as a finite stiffness rotation spring，base on rotation and displacement equation derive the element stiffness matrixes with semi-rigid connections where the effects ofj ointed flexibility geometric non-linearity and shear forces in the connection deformations have been considered in and fixed-end forces are modified．Finally,a program for calculating semi-rigid with incremental-iterative method has been<WP=4>compiled for calculating and analyzing． By calculating results of several example decade for steel frame in semi-rigidjoints cases the top story deflection and the initial end moment at column is larger,nevertheless the end moment at beam may be smaller when compared to the rigidjoint case．Affect of the semi-rigid joint Can be reduced by the use of bracingmembers．Influences of second order effect and shear forces in the connection deformations are larger when the semi-rigid j oint case is compared to the rigid j ointcase．Base on static and analysis of calculating results the range of the joint stiffness isput forward when influence of the semi-rigid joint is irrespective and parameter modified of inter force and displacement is given when influence of the semi-rigidjoint is considered that offers advice for in actual design更多还原