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  李振宝,郝娜,崔燕伟,宋坤.基于软化拉-压杆模型的RC空间边节点抗剪承载力计算方法[J].震灾防御技术,2019,14(1):1-9, DOI:10.11899/zzfy20190101.

基于软化拉-压杆模型的RC空间边节点抗剪承载力计算方法
摘要:    实际地震作用是多维的、随机的,框架节点在2个方向同时受力,其抗震能力相比于单向地震作用会降低。目前,对节点核心区在2个方向同时受力时抗剪承载力的研究尚未完善。在双向受力下,节点核心区2个方向传来的剪力形成合剪力作用面,在节点核心区内部形成不同于单向受力下的斜向斜压杆。本文基于软化拉-压杆模型,针对水平双向受力相同的空间边节点,在合剪力作用面内建立抗剪承载力计算模型,确定空间边节点核心区斜压杆以及钢筋拉杆的计算方法。利用有限元软件建立不同参数空间边节点模型,并收集部分空间节点试验数据,将剪力计算值与模拟值或试验值进行对比。结果表明,基于软化拉-压杆模型建立的双向受力下钢筋混凝土框架,其边节点抗剪承载力计算值与模拟值或试验值吻合良好。
作者单位
李振宝 北京工业大学, 工程抗震与结构诊治北京市重点实验室, 北京 100124 
郝娜 北京工业大学, 工程抗震与结构诊治北京市重点实验室, 北京 100124 
崔燕伟 北京工业大学, 工程抗震与结构诊治北京市重点实验室, 北京 100124
河南城建学院, 土木与交通工程学院, 河南平顶山 467036 
宋坤 燕山大学, 建筑工程与力学学院, 河北秦皇岛 066004 
关  键  词:空间边节点  双向受力  抗剪承载力  软化拉-压杆模型
DOI:10.11899/zzfy20190101
基金项目:国家自然科学基金项目(51508493),河北省博士后科研项目(B2016005003)
收稿日期:2018-05-15
作者简介:李振宝,男,生于1962年。教授。主要从事工程结构抗震研究。E-mail:lizb@bjut.edu.cn
通讯作者:郝娜,女,生于1992年。硕士研究生。主要从事工程结构抗震研究。E-mail:haona6710163.com
Shear Capacity Calculation Method of Reinforced Concrete Frame Spatial Exterior Joints Using Softened Strut and Tie Model
Abstract:      In practice, earthquake action is multi-dimensional and random, in which panel zone in frame structure is subjected to bidirectional loading. Under such case the anti-seismic capability may be lower than the designed capability based on unidirectional earthquake action.So far, the detailed calculation methods of shear capability for panel zone in reinforced concrete (RC) frame subjected to bidirectional loading has not been studied well. In this paper,we take reinforced concrete frame exterior joints under bidirecitional loading as a subject, and study the mechanical properties and shear mechanism of spatial exterior joints, in order to establish a calculation method of spatial exterior joints base on softened strut-and-tie model (SSTM), and to verify the accuracy of the calculation method.Obtained by the analysis, a synthetic shear force is imposed on panel zone and the inclined compression zone is formed at the end of column under bidirecitional loading, which is different from the shear mechanism under unidirectional loading.The spatial exterior joint models with different variables are established and analyzed with the software of ABAQUS, then we compare the simulated values to calculated values.The result shows that the calculation method of reinforced concrete frame exterior joints under bidirecitional loading based on SSTM is useful in providing calculated results with high accuracy.
Keywords:  Spatial exterior joints  Bidirectional loading  Shear resistance  Softened strut and tie model
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