（内蒙古科技大学建筑与土木工程学院， 包头 014010）

［摘要］为了研究多层矩形钢管混凝土框架的塑性铰长度和塑性铰开展顺序，通过一榀单跨三层矩形钢管混凝土框架结构的低周反复荷载试验以及非线性有限元分析，得到了该类框架结构的破坏模式、塑性铰的分布位置、塑性铰的长度以及其开展顺序。结果表明：该框架表现出“强柱弱梁”的破坏机制，塑性铰开展的顺序依次是框架2层梁端、1层梁端、顶层梁端、框架柱脚；梁、柱端塑性铰中心出现在距离环板和加劲肋40mm的位置，塑性铰长度约为100mm；当轴压比小于0-4且剪跨比小于2时，通过理论计算得到框架柱的塑性铰长度为98-7mm，框架梁的塑性铰长度为104-4mm；采用ABAQUS有限元软件对试验全过程分析得到的滞回曲线饱满，并与试验滞回曲线相吻合，说明此类框架结构抗震性能良好；有限元模拟得到框架梁、柱塑性铰长度为100mm；试验分析、理论计算和有限元模拟得到框架结构的塑性铰长度基本一致，说明选用的塑性铰长度计算方法适用于多层矩形钢管混凝土框架，可为实际工程设计提供相关依据。

［关键词］矩形钢管混凝土； 框架结构； 抗震性能； 有限元； 塑性铰长度

中图分类号：TU398文献标识码：A文章编号：1002-848X(2017)23-0061-05

Experimental research on plastic hinge length of a three-layer rectangular  concrete filled steel tube frame

Wen Yang, Yu Yang, Yang Zheng, Yang Xiaoyun

(College of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China)

Abstract:To study plastic hinge length and the development of plastic hinge order of multilayer rectangular concrete filled steel tubular frames, a three-layer rectangular  concrete filled steel tube  frame structure under low cyclic loading tests and nonlinear finite element analysis were carried out. The failure mode of the frame structure, plastic hinge distribution, plastic hinge length and the development of plastic hinge order were obtained. The results indicate that the framework show the failure mechanism of “strong column and weak beam”, the development of plastic hinge order is the end of beam in the second layer, the end of beam in the first layer, the end of beam in the top layer, root of the column. Beam and column plastic hinge center appear in the distance ring plate and stiffener 40mm, the plastic hinge length is about 100mm. When the axial compression ratio is less than 0-4 and the shear span ratio is less than 2，the theoretical calculation of frame column plastic hinge length is 98-7mm, the plastic hinge  length of the beam is 104-4mm. ABAQUS finite element software is adopted to analyze the whole process and the full hysteresis curve is got. Hysteresis curves coincide with the experiment, which shows that this kind of frame structure seismic performance is good. The finite element simulation of beam and column plastic hinge length is 100mm. The plastic hinge length of the frame structure of obtained from test analysis, theoretical calculation and finite element simulation are basically the same, which shows that the plastic hinge length calculation method can be applied to the rectangular concrete filled steel tube  frame and can provide the basis for the practical engineering design.

Keywords:rectangular concrete filled steel tube; frame structure; seismic performance; finite element; plastic hinge length

*国家自然科学基金项目（51068021），内蒙古自然科学基金项目（2013MS0715）。

作者简介：闻洋，副教授，博士，硕士生导师，Email: wenyangalbert@163.com。