Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Performance of Partially Grouted, Minimally Reinforced CMU Cavity Walls against Blast Demands. II: Performance under Impulse Loads
This paper presents the results of full-scale blast load testing of partially grouted single-wythe and multiwythe insulated masonry walls. Three design sections were evaluated, as follows: (1) a 150-mm (6-in.) standard block masonry wall reinforced with 10-mm (No. 3) rebar at 80-cm (32-in.) maximum spacing, (2) a 200-mm (8-in.) standard block masonry wall reinforced with 13-mm (No. 4) rebar at 122-cm (48-in.) maximum spacing, and (3) a cavity wall consisting of 200-mm (8-in.) standard reinforced concrete masonry unit (CMU) wythe plus a 102-cm (4-in.) clay facing brick veneer with 52-mm (2-in.) thick extruded polystyrene rigid board insulation and a 25-mm (1-in.) air gap between the structural wythe and the veneer. Each test panel was 285 cm (112 in.), seven blocks, in (136 in.), 17 courses, in height. Only the cells containing reinforcement were grouted. Three blast load experiments were conducted; each experiment tested one each of the three test panel designs. The loading varied significantly between each of the three experiments. Dynamic displacement at several locations through the height (quarter points) of each panel was recorded. The reflected pressures, free field pressures, and internal pressures were recorded at several locations. Interior and exterior videography was also used to record the response. A detailed posttest forensic evaluation was conducted to determine predominant failure mechanisms. The measured transient deflection responses were then compared to analytical responses calculated using the static resistance functions generated from the test results presented in the companion paper as well as by typical blast design methodologies. The comparisons demonstrated that the design resistances used in blast analysis single degree of freedom methodology are conservative. However, the blast testing demonstrated that potentially dangerous modes of localized failure between the grouted cells can occur at scaled distances that are significantly greater than scaled distances that would be assumed to cause breaching.
Performance of Partially Grouted, Minimally Reinforced CMU Cavity Walls against Blast Demands. II: Performance under Impulse Loads
This paper presents the results of full-scale blast load testing of partially grouted single-wythe and multiwythe insulated masonry walls. Three design sections were evaluated, as follows: (1) a 150-mm (6-in.) standard block masonry wall reinforced with 10-mm (No. 3) rebar at 80-cm (32-in.) maximum spacing, (2) a 200-mm (8-in.) standard block masonry wall reinforced with 13-mm (No. 4) rebar at 122-cm (48-in.) maximum spacing, and (3) a cavity wall consisting of 200-mm (8-in.) standard reinforced concrete masonry unit (CMU) wythe plus a 102-cm (4-in.) clay facing brick veneer with 52-mm (2-in.) thick extruded polystyrene rigid board insulation and a 25-mm (1-in.) air gap between the structural wythe and the veneer. Each test panel was 285 cm (112 in.), seven blocks, in (136 in.), 17 courses, in height. Only the cells containing reinforcement were grouted. Three blast load experiments were conducted; each experiment tested one each of the three test panel designs. The loading varied significantly between each of the three experiments. Dynamic displacement at several locations through the height (quarter points) of each panel was recorded. The reflected pressures, free field pressures, and internal pressures were recorded at several locations. Interior and exterior videography was also used to record the response. A detailed posttest forensic evaluation was conducted to determine predominant failure mechanisms. The measured transient deflection responses were then compared to analytical responses calculated using the static resistance functions generated from the test results presented in the companion paper as well as by typical blast design methodologies. The comparisons demonstrated that the design resistances used in blast analysis single degree of freedom methodology are conservative. However, the blast testing demonstrated that potentially dangerous modes of localized failure between the grouted cells can occur at scaled distances that are significantly greater than scaled distances that would be assumed to cause breaching.
Performance of Partially Grouted, Minimally Reinforced CMU Cavity Walls against Blast Demands. II: Performance under Impulse Loads
Hoemann, John M. (Autor:in) / Shull, Jonathan S. (Autor:in) / Salim, Hani H. (Autor:in) / Bewick, Bryan T. (Autor:in) / Davidson, James S. (Autor:in)
02.09.2014
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
| British Library Online Contents | 2015
| British Library Online Contents | 2015