Progressive collapse resisting capacity of reinforced concrete load bearing wall structures
来源期刊：中南大学学报(英文版)2015年第7期
论文作者：Alireza Rahai Alireza Shahin Farzad Hatami
文章页码：2730 - 2738
Key words：reinforced concrete (RC) load bearing wall structure; progressive collapse; fiber sections; nonlinear analysis; load factor method
Abstract: Reinforced concrete (RC) load bearing wall is widely used in high-rise and mid-rise buildings. Due to the number of walls in plan and reduction in lateral force portion, this system is not only stronger against earthquakes, but also more economical. the effect of progressive collapse caused by removal of load bearing elements, in various positions in plan and stories of the RC load bearing wall system was evaluated by nonlinear dynamic and static analyses. For this purpose, three-dimensional model of 10-story structure was selected. The analysis results indicated stability, strength and stiffness of the RC load-bearing wall system against progressive collapse. It was observed that the most critical condition for removal of load bearing walls was the instantaneous removal of the surrounding walls located at the corners of the building where the sections of the load bearing elements were changed. In this case, the maximum vertical displacement was limited to 6.3 mm and the structure failed after applying the load of 10 times the axial load bored by removed elements. Comparison between the results of the nonlinear dynamic and static analyses demonstrated that the “load factor” parameter was a reasonable criterion to evaluate the progressive collapse potential of the structure.
Alireza Rahai1, Alireza Shahin1, Farzad Hatami2
(1. Department of Civil Engineering, Amirkabir University of Technology (Tehran Polytechnic) No. 424,
Hafez Ave., P. O. Box. 15875-4413, Tehran, Iran;
2. Structural & Earthquake Research Center (SERC), Amirkabir University of Technology No.424,
Hafez Ave., P. O. Box. 15875-4413, Tehran, Iran)
Abstract:Reinforced concrete (RC) load bearing wall is widely used in high-rise and mid-rise buildings. Due to the number of walls in plan and reduction in lateral force portion, this system is not only stronger against earthquakes, but also more economical. the effect of progressive collapse caused by removal of load bearing elements, in various positions in plan and stories of the RC load bearing wall system was evaluated by nonlinear dynamic and static analyses. For this purpose, three-dimensional model of 10-story structure was selected. The analysis results indicated stability, strength and stiffness of the RC load-bearing wall system against progressive collapse. It was observed that the most critical condition for removal of load bearing walls was the instantaneous removal of the surrounding walls located at the corners of the building where the sections of the load bearing elements were changed. In this case, the maximum vertical displacement was limited to 6.3 mm and the structure failed after applying the load of 10 times the axial load bored by removed elements. Comparison between the results of the nonlinear dynamic and static analyses demonstrated that the “load factor” parameter was a reasonable criterion to evaluate the progressive collapse potential of the structure.
Key words:reinforced concrete (RC) load bearing wall structure; progressive collapse; fiber sections; nonlinear analysis; load factor method
