Jin H.,The Key Laboratory of Earthquake Engineering and Engineering Vibration |
Jin H.,Institute of Engineering Mechanics |
Jin H.,Harbin University of Commerce |
Dai J.,The Key Laboratory of Earthquake Engineering and Engineering Vibration |
Dai J.,Institute of Engineering Mechanics
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2013
Based on the investigation on the collapsed Xuankou middle school buildings in 2008 Wenchuan earthquake, the collapse mechanism of typical side corridor school building is studied in this paper. Three of typical transverse frame units of the collapsed building are selected as the prototype, and three 1/2 scale, single-story, two-bay specimens with floor have been tested. Specimen 1 is designed to simulate the intermediate frame without any masonry infill, specimen 2 to simulate the gable frame with traditionally used clay brick masonry fully in-filled in both two spans, and specimen 3 to simulate the intermediate frame with popularly used aerated concrete block masonry fully in-filled in the larger span only. The quasi-static test results for the three specimens show that: (1) The unexpected failure mechanism of "strong beam and weak column" happened in all specimens, the existence of the RC floor cast in-situ is the major cause; (2) Masonry infill take critical role to specimen's lateral stiffness, strength, ductility and the failure pattern; (3) The existence of masonry infill accentuated the damage severity of the central column, the structural collapse initiated from the central column. The collapse pattern consists well with the phenomenon observed in the collapsed Xuankou school buildings.