刘坚+潘澎+李东伦+周观根+于志伟+陈原

摘要：首先对已有钢结构梁柱节点半刚性连接弯矩转角经典模型存在的不足进行了述评；然后采用非线性有限元方法对有无楼板刚度贡献的外伸端板半刚性连接节点进行了非线性仿真分析，把获得的这种节点半刚性连接弯矩转角关系与常用梁柱节点半刚性连接弯矩转角经典模型进行了对比分析；最后运用神经网络智能算法，首次提出了考虑楼板刚度影响的十参数梁柱节点外伸端板半刚性连接智能模型。研究结果表明：楼板的存在增大了梁柱节点刚度，减少了节点相对转动，使得实际工程中存在楼板刚度影响的半刚性连接弯矩转角关系与现有半刚性连接弯矩转角模型计算得到的弯矩转角关系存在着较大误差；提出的十参数半刚性连接弯矩转角神经网络模型能较好地模拟这种节点实际受力和变形情况；提出的智能模型具有较高精度和计算效率，同时也具有可靠性、有效性和实用性。研究结果可为考虑楼板刚度贡献的其他半刚性连接形式的弯矩转角关系的进一步研究以及在实际工程中的应用提供参考。

关键词：楼板刚度；外伸端板；半刚性梁柱节点；弯矩转角；神经网络；仿真分析

中图分类号：TU392.4文献标志码：A

Neural Network Model of Momentrotation Relation in Semirigid

Beamcolumn Joints Considering Floor StiffnessLIU Jian1， PAN Peng1， LI Donglun1， ZHOU Guangen2， YU Zhiwei1， CHEN Yuan1

（1. School of Civil Engineering， Guangzhou University， Guangzhou 510006， Guangdong， China；

2. Zhejiang Southeast Space Frame Co.， Ltd， Hangzhou 311209， Zhejiang， China）Abstract： The shortage of existing classic momentrotation model which was semirigid connections of beamcolumn joints for steel structure was reviewed. The nonlinear simulation analysis of semirigid joints for endplate steel structure with floor stiffness and without floor stiffness were carried out using nonlinear finite element method， and the momentrotation relation in semirigid joints was compared with that in semirigid classic momentrotation model. Finally， based on the neural network intelligent algorithm， the ten parameters neural network model which considered the effect of floor stiffness was established. The study results show that the floor can increase the stiffness of the beamcolumn joints， and reduce the relative rotation of joints. Which makes the curves for semirigid joints in practical engineering has large error with the existing classic semirigid joint model； the neural network model of semirigid joints for steel structure with floor stiffness effect can simulate the reality loading and transformation performance of semirigid beamcolumn joints； the neural network model has higher precision and computational efficiency， reliability， validity and practicability. The obtained results can provide references for the further study in other semirigid connections with floor stiffness and application in practical engineering.

Key words： floor stiffness； extended endplate； semirigid beamcolumn joint； momentrotation； neural network； simulation analysis

0引言

随着钢产量的逐年增加和国家政策的鼓励，钢结构已经成为中国高层建筑中常用的形式之一[1]，梁柱外伸端板连接是钢结构工程中半刚性连接比较常见的一种[2]，目前，各国学者对端板式连接节点的抗震性能展开了深入的研究[37]，节点半刚性降低了横梁对柱子的约束刚度，节点耗能能力得到增强，有利于抗震。……