The Technical File | Groundforce

technical@vpplc.com www.groundforce.uk.com Groundforce Shorco | Technical File Issue 3.0 MP125 & 150 Hydraulic Struts MP125 / 150 Hydraulic Strut - Working Load Chart - refer to section ‘i’ for more information The lines on the chart below indicate the maximum working axial strut loading at various spans and includes an allowance for either 0kN, 10kN or 20kN accidental load applied at mid-span (see load effect diagram below). The area under the lines indicate the envelope for a safe solution. It is not considered necessary to account for thermal effects in MP125 / 150 struts when used in the UK and therefore this is not included in this chart. Please refer to section ’i’ for more information on load effects on struts. Explanation: The horizontal Green portion of the lines on the chart indicates the working axial capacity of the strut assembly as limited by the capacity of the hydraulic unit i.e. either 1250kN / 1500kN. The sloping lines indicate a load reduction from this value due to the potential for buckling of the steel tubular extension members. The sloping Green Line represents the working load after taking into account a 20kN mid-span accidental load. The Red Line represents the working load after taking into account a 10kN accidental load. The Blue Line represents the working load without allowing for any accidental loading effects. The blue line must be used with caution and after a full risk analysis. Notes on applied factors of safety: The lines on the graph below are expressed in terms of working load limit. These values represent the remaining structural capacity or resistance once allowances have been made for the bending effects induced by self weight, accidental loading, eccentricity and secondary moments (see diagram below and also notes in section ‘i’). A minimum global factor of safety of 2.0 has been applied to all hydraulic components in order to determine the overall working axial capacity of the hydraulic ram. Regarding steelwork, structural resistances have been calculated in accordance with BS5950: 2000. A global factor of 1.6 has been applied to ULS values to reduce them to working values. Notes: 1. Thermal effects are not included in the graph. 2. P-delta effects are taken into account and include a 10% strut diameter allowance for eccentricity of loading W. Working Load (kN) at Zero Accidental Load Working Load (kN) at 10kN Accidental Load Working Load (kN) at 20kN Accidental Load These three lines are valid for MP150 strut assemblies which incorporate the heavy duty extension units. The dashed lines are valid for MP150 strut assemblies which incorporate the standard duty extension units. These lines are valid for either MP125 or MP150 strut assemblies which incorporate the standard duty extension units. 5.2.3

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