Many of these testing procedures contained herein are developmental and will be evaluated during a collector testing program being sponsored by the Department of Energy (see Appendix C of this report). Revisions or deletions will be made as more experience is gained and inputs are received from appropriate industry representatives, testing laboratories, designers, etc. Many of the procedures given in this report are intended for use as a supplement to engineering analysis and would ordinarily be performed only when such analysis is not feasible, e.g. with some innovative designs. Comments concerning these tests are invited and should be addressed to:

Existing information is compiled which would assist in determining structural and non-structural safety requirements for guardrails used for the protection of employees against occupational hazards. Critical aspects of guardrail safety are identifed through exploratory studies consisting of field surveys of prototypical installations, reviews of existing standards and industrial accident records, and compilation of relevant anthropometric data. These exploratory studies will be utilized to design an experimental program which will consist of structural tests to determine design loads and non-structural tests to determine geometric requirements for guardrail safety.

7.3.2. Capacity of Brick Prisms 39 7.3.3. Capacity of Concrete Block Prisms 40 7.3.4. Capacity of Composite Prisms... 41 7.3.5. Failure Hypothesis for HoUow Concrete Block 42 7.3.6. Summary of Findings and Conclusions 43 7.4. WaU Capacity 43 7.4.1. Capacity of Brick Walls 43 7.4.2. Capacity of Concrete Block Walls 44 7.4.3. Capacity of Composite WaUs ... 45 7.4.4. Summary of Findings and Conclusions 46 Conclusions and Recommendations 47 8.1. Conclusions 47 8.2. Recommendations 48 Appendix 48 9.1. Flexure-Compression Interaction 48 9.2. Numerical Analysis of HoUow Concrete Block Unit in Compression 50 References 57 ill Notation A Area of net section a Flexural compressive strength coefficient af'm Flexural compressive strength of masonry b Width of wall c Distance from centroid to outer fiber E Modulus of elasticity in compression normal to bed joint Ei Initial tangent modulus of elasticity EI Flexural rigidity of masonry at failure e Eccentricity relative to centroid of section efc Distance from centroid to edge of kern f'm. Compressive strength of masonry determined from axial prism tests ft' Tensile strength of masonry determined from modulus of rupture tests g Coefficient in the evaluation of Me h Unsupported height of wall /, /" Moment of inertia of section based on uncracked net section L Height of wall between lateral supports M Resultant moment on cross section Me Maximum moment capacity, computed using linear stress gradients Mk Moment developed by Pk applied at the edge of the kern Mo Maximum moment capacity exclusive of slenderness effect m Ratio of elastic moduli in composite section P Resultant compressive force on cross section Per Critical buckling load for walls with pinned supports Pk Vertical load capacity when load is apphed at the edge of the kern of a wall section Po Short-wall axial load capacity determined on the basis of prism strength t Thickness of wall w Distributed transverse load A Maximum transverse deflection v * Exactly. vi

Many of these testing procedures contained herein are developmental and will be evaluated during a collector testing program being sponsored by the Department of Energy (see Appendix C of this report). Revisions or deletions will be made as more experience is gained and inputs are received from appropriate industry representatives, testing laboratories, designers, etc. Many of the procedures given in this report are intended for use as a supplement to engineering analysis and would ordinarily be performed only when such analysis is not feasible, e.g. with some innovative designs. Comments concerning these tests are invited and should be addressed to:

No abstract