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Optimum design of roof truss installations based on bending strain energy.

Authors
Mangelsdorf-CP
Source
Paper in Proceeds, 28th U. S. Symposium on Rock Mechanics. Balkema PP 1115-1122, 1987; :1115-1122
Link
NIOSHTIC No.
10011431
Abstract
Questions asked by mine operators about the installation of roof trusses frequently deal with optimum position, slope, and initial tension of the inclined chords. The purpose of this paper is to examine the effects of those chord parameters on the strain energy of bending and to offer optimum values which will minimize the strain energy of the immediate roof. The method of solution involves calculating strain energy in bending for a roof beam partially supported by a roof truss. The beam is treated as homogeneous and isotropic. The strain energy contours are then plotted as functions of the truss uplift force and its position. Approximate optimum conditions can usually be achieved without specific knowledge of the material properties of the roof. The results are compared with current practice.
Keywords
Mining-industry; Rock-mechanics; Engineering-controls; Force
Publication Date
19870101
Document Type
OP
Fiscal Year
1987
NTIS Accession No.
NTIS Price
Identifying No.
OP 176-92
NIOSH Division
PRC
Source Name
Paper in Proceeds, 28th U.S. Symposium on Rock Mechanics. Balkema, PP. 1115-1122
State
PA
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