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In-situ Blast Testing of Shear-Screw Mechanical Couplers

机译：剪切螺杆机械耦合器的原位爆破试验

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The purpose of this study is to determine the capability of mechanical splices in reinforced concrete to develop the ultimate strength of typical reinforcement without limiting its ductility, as required by UFC 3-340- 02. This study also follows the UFC 3-340-02 requirement for a specific mechanical coupler to be tested in a dynamic application prior to use in blast resistant structures. Mechanical couplers have been developed to meet requirements in conventional design codes, such as ACI, and to meet the demands of cyclic loading in seismic zones, however, little in-situ testing has been conducted on mechanical couplers under high strain rate dynamic load, as would be typical in a blast response. The 2009 effort included a test series on one- way reinforced concrete slabs using the BakerRisk shock-tube to simulate blast loads from high explosives and industrial explosions. The shocktube test series included concrete slabs with continuous reinforcement, lap splices, and mechanical splices for comparison purposes. Both types of splices were placed in areas of the slab subjected to the highest flexural demand, as well as in areas of the slab removed from high flexural demand. The results of this study are limited to the test results of one specific mechanical coupler, namely a shear screw coupling sleeve. At the completion of the test series, BakerRisk concluded that the mechanical coupler was able to develop the reinforcement beyond the dynamic yield strength and not limit the ductility of the reinforcement; however, further testing is required to determine if the couple is capable of developing the full ultimate strength of the reinforcement under blast loading.

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