EXISTING STRUCTURES EVALUATION. PART I: WALLS
STANFORD RESEARCH INST MENLO PARK CA MENLO PARK
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The objective of the investigation was to develop an evaluation procedure applicable to existing NFSS-type structures for determining the blast protection afforded and the cost of structure modifications to improve the blast protection. The approach adopted was to formulate a procedure that would permit examining the response of a structure over a range of incident overpressure levels to determine the pressure at which failure of the various elements occurs. Because of the scope of the overall evaluation program, the initial phase was primarily concerned with the response of the exterior walls. The initial effort included the development of analytical procedures and computer programs to predict the collapse of three types of blast loaded exterior wall elements. The wall types considered were unreinforced concrete or masonry unit walls without arching, reinforced concrete walls, and unreinforced concrete or masonry unit walls with arching. To determine the sensitivity of the collapse pressure of exterior walls to various factors, a parametric study was conducted of the response of selected wall elements subjected to arbitrary dynamic loads. In addition, the analytical predictions were compared with the limited laboratory and nuclear field test data.