Computational and Experimental Study on Comparing the Methods of Retrofitting the Steel Lattice Tower under the Effect of Wind Load

One of the common structures in power transmission towers is the steel lattice towers with the bolted connection type, which can be vulnerable to wind loads due to their low weight and high height. Due to the change in the wind design codes and the placement of new devices on these towers, retrofitting is inevitable. In this research, firstly, the effect of wind load on the mentioned structure has been investigated, in calculating the wind force on the structure, the coefficient that is related to the geometry of the structure is the CP coefficient. Wind pressure coefficients (CP) were obtained using Ansys software based on the structure's computational fluid dynamics (CFD) method. Based on the CFD analysis, the maximum positive pressure coefficient (pressure) and the maximum negative pressure coefficient (suction) are obtained as +۱ and -۱.۲, respectively. Using the computational analysis of the structure under the effect of wind, it was observed that under the effect of wind load, the factor of instability of the structure can be the buckling of the compressive members. Therefore, seven models were studied under buckling test. The M۱ model served as the base model consisting of a single angle, while the M۲ to M۷ models represented reinforced variations of the original design. Experimental and numerical results revealed that adding an angled connection along a section of the primary member's length (M۴ model) can increase the member's resistance by ۳۸%.

کلیدواژه ها:

CFD ، Retrofitting ، steel lattice tower ، wind pressure coefficients