The Effects Of Bolted Joint Mechanical Behavior On The Distribution Of Internal Force In Angle Steel Tower

Transmission tower is a large statically indeterminate structure, nodes’ mechanicalproperties will affect members’ internal force distribution. Nodes’ connection are usuallyassumed to be rigid connection or articulated connection in traditional methods, but thatis different from the real force status, and the differences are proved by large number oftower tests’ results.In order to study the nodes’ mechanical properties’ influence on angle steel tower’sinternal force distribution, the tower model and loading device are designed, experimentplan was proposed, strain gauges’ paste method was verified, tower’s main components’axial strain was got and was compared with traditional truss and beam method’s results.In the transmission tower structural analysis, this paper proposed introducingsemi-rigid connection, eccentric connection and Joint slippage nonlinear iterativemethods, there selected five joint slippage models and deduced members’ axial stiffnessequivalent reduction method. The tower’s parameterized finite element model was builtwith APDL-based programming languages, and analyzed the tower’s internal force, gotthe main members’ axial force. Comparing the finite element method’s results withtraditional method’s results, it showed that diagonal members’ semi-rigid connection andeccentric connection have little influence on members’ axial strain; on the other hand,diagonal members’ joint slippage is the main reason why the main members’ axial forceis different from the test’s results. Equivalent stiffness reduction models’ calculatedresults are closer to the test results, improving the accuracy of the tower structure forcesanalysis results.