装配式H形截面钢柱预压抗弯型连接节点参数研究  

Study on parameters of preloaded moment-resistant spliced joint of assembled H-section steel column

作　　者：焦燏烽 宁凯洋 白晓红 JIAO Yufeng;NING Kaiyang;BAI Xiaohong(School of Civil Engineering,Henan University of Science and Technology,Luoyang 471023,China)

机构地区：[1]河南科技大学土木工程学院,洛阳471023

出　　处：《建筑结构》2021年第13期102-109,共8页Building Structure

基　　金：国家自然科学基金项目(51508164);河南省科技攻关计划(172102310716,172102210260);河南科技大学博士科研启动基金项目(13480022)。

摘　　要：提出一种新型装配式H形截面钢柱预压抗弯型连接节点,即在柱拼接处腹板两侧各焊接一个支撑板及两个加劲板,两段柱上的支撑板通过四个预应力拉杆连接,对拉杆施加预拉力后,对柱端面产生预压力,利用此预压力产生的摩擦力抗剪,利用压应力抗弯,实现荷载传递。建立试验试件的有限元模型,模拟了柱翼缘出现屈曲变形之后的滞回性能和失效模式。有限元计算得到的滞回曲线与试验结果吻合较好。在校准过的模型的基础上,通过改变节点几何参数和力学参数,分析了5个系列50个节点的力学性能。结果表明:预应力拉杆是影响节点性能的重要组件,不同的预拉力施加值对节点性能影响很大,但预拉力的损失对节点初始转动刚度影响不大;钢柱翼缘板自由外伸宽度b与其厚度t之比β是对节点性能影响较大的参数,当该比值较大时,柱拼接节点处翼缘较易发生局部失稳。因此,合理的β值,是节点设计的关键因素。A new type of preloaded moment-resistant spliced joint of assembled H-section steel column was proposed,that is,a supporting plate and two stiffening plates are welded on both sides of the web of the spliced column,and the supporting plates on the two sections of columns are connected by four pre-stressed tie rods.After the pre tension is applied,the pre-pressure will be produced on the end face of the column.By using the friction force produced by the prepressure to resist shear and compressive stress to resist bending,load transfer is realized.The finite element model of the test specimen was established to simulate the hysteretic performance and failure mode of the column flange after buckling.The hysteretic curve calculated by finite element is in good agreement with the test results.Based on the calibration model,the mechanical properties of 50 joints in five series were analyzed by changing the geometric and mechanical parameters of the joints.The results show that the pre-stressed tie rod is an important component to ensure the performance of the joint,and different pre-tension values have a great impact on the performance of the joint,but the loss of pre-tension has little effect on the initial rotational stiffness of the joint;the ratioβof the free overhanging width b of the steel column flange plate to its thickness t is a parameter that has a great influence on the performance of the joint.Whenβvalue is large,the flange at the column splicing joint is prone to local instability.Therefore,reasonableβvalue is the key factor of the joint design.

关 键 词：装配式 预压抗弯型连接节点 预应力拉杆 往复加载试验 参数分析 

分 类 号：TU391[建筑科学—结构工程]