双腹板工字型GFRP腰梁连接受力性能研究

为研究深基坑支护中双腹板工字型GFRP腰梁连接节点力学性能,针对GFRP腰梁的两种套筒式连接方法开展两点对称加载足尺试验,借助ABAQUS有限元模拟软件建立两种连接方法的三维数值模型,分析不同连接方法GFRP腰梁的受力性能,并以腰梁跨中截面为研究对象,揭示连接套筒与GFRP腰梁的横向变形规律,掌握不同连接形式GFRP腰梁构件的极限状态和破坏形式。结果表明,双腹板工字型GFRP腰梁承载力高,构件的稳定性好;采用内置式钢套筒连接构件变形较小,节点承载力更高,现场安装方便,能够实现基坑支护中腰梁构件的循环利用,是GFRP腰梁现场施工的合理连接方式。

Study on Mechanical Behavior of Double Web I-shaped GFRP Waist Beam Connection

In order to study the mechanical performance of the connection nodes of double web I-beam GFRP waist beam in deep foundation support, two sleeve type connection methods of GFRP waist beams were tested with two points of symmetric loading footage, and the three-dimensional numerical models of the two connection methods were established with the help of ABAQUS finite element simulation software to analyze the force performance of GFRP waist beams with different connection methods, and the span section of waist beam was taken as the object of study to reveal the transverse deformation law of the connection. The transverse deformation law between the sleeve and the GFRP waist beam is studied, and the limit states and damage forms of the GFRP waist beam members with different connection methods are mastered. The results show that the double web I-beam GFRP waist beams have high bearing capacity and good stability of the members; the use of built-in steel sleeves to connect the members has less deformation, higher node bearing capacity, easy installation on site, and can realize the recycling of waist beam members in foundation pit support, which is a reasonable connection method for GFRP waist beam construction on site.