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由于设计规范中风荷载要求的改变、电能需求的增加、通信行业的蓬勃发展,对现有钢桁架塔进行改装逐渐成为输电塔行业的重要战略。目前,实践中桁架输电塔采用的加固方法主要有2种。一种是沿塔高在桁架各杆件的中点处设置一系列横向支撑(隔板);另一种是利用附加构件对角钢支腿进行改装、加固,以提高其承载力。该文利用单板角钢支腿改装模型和非线性有限元(FEM)模型对最有效的腿材改装方法进行了研究。开发出模拟板件和螺栓连接件的3D连续单元,并将其与试验结果进行对比,吻合较好。研究发现,试验的关键问题是螺栓滑移,可通过一个简单的锁定系统(为模拟螺栓滑移开发的新技术)对模型进行简化。简化后的模型能够用于多面板建模。
Due to the change of the design specifications of stroke load requirements, the increase of power demand and the vigorous development of the communications industry, the retrofitting of the existing steel truss towers has gradually become an important strategy of the power transmission tower industry. At present, there are mainly two kinds of reinforcement methods used in the truss transmission tower in practice. One is to install a series of transverse supports (partitions) along the tower mid-point of the truss members, and the other is to modify and reinforce the angle steel support legs with additional components to increase the bearing capacity. In this paper, the most effective method of retrofitting the leg material is studied by using the veneer angle steel outrigger modified model and the nonlinear finite element (FEM) model. Developed the 3D continuous unit simulating the plate and the bolt connection, and compared with the test results, which is in good agreement. The study found that the key issue for testing was bolt slippage, which was simplified with a simple locking system (a new technology developed to simulate bolt slippage). The simplified model can be used for multi-panel modeling.