Abstract
The paper presents the finite element method approach to determine stress distribution in rockfall barrier post with end to end-plate connection, assembled with high tensile bolts under two different types of impact load. For the analysis purposes typical fixed to the foundation, rockfall barrier post is adopted with 2,50 m height and sixty degrees slope to the horizontal ground line. One post end is fixed (welded) to the base plate – anchored to foundation, the second end is supported via retaining rope. The impact load applied exactly in the post mid-height and boulder caught via net in the mid-distance between two consecutive post are discussed. Four different locations of end to end-plate connection are analysed measuring from the fixed support i.e. dimension varies in the range of 0,30 m up to 0,60 m with 0,10 m step. Six high tensile bolts, zinc coated with 12.9 grade strength have been adopted in the connection. The stated boundary problem was solved by means of SolidWorks software.
Highlights
Rockfalls in mountains, on engineered slopes, mines etc. due to an unknown time of occurrence are hazardous phenomena causing serious threat for human lives, settlements, transportation and other infrastructure
In the paper stress distribution is investigated in a fixed rockfall barrier post with end to end-plate connection under applied two different impact loads
The paper presents numerical analysis concerning the influence of high tensile bolts tightening torque on stress distribution in fixed rockfall barrier post with four different locations of end to end-plate connection
Summary
On engineered slopes, mines etc. due to an unknown time of occurrence are hazardous phenomena causing serious threat for human lives, settlements, transportation and other infrastructure. In the cases showing soil of a significantly lower strength than bedrock, gravels, sands special concrete retaining plate may be utilized to prevent barrier sliding (see Fig. 1a). In the hinged barriers energy is transferred mainly via the retaining ropes, while in self-supporting fixed posts energy is dissipated via profile deformation and net rigidity – the rest of the energy is transferred onto the concrete pedestal. The main advantage of self-supporting fixed posts is the possibility of omitting the retaining ropes, which eliminates the necessity of providing additional anchors upslope, if the required ropes may significantly strengthen the system bearing capacity. In the paper stress distribution is investigated in a fixed rockfall barrier post with end to end-plate connection under applied two different impact loads. All numerical calculations were performed with the use of SolidWorks software, with a simulation module fully based on finite element method
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