Study On Progressive Collapse Resistance Of Reinforced Concrete Structures

For important and higher security grade building, the progressive collapses resistance ability should be fully estimated, such as analyzing the strength, stiffness and stability due to their significance and higher security grade. It means that structures should be able to adjust the internal forces automatically, thereby resisting the continuation of damage and maintaining the whole structural stability when local members failed suddenly as a result of accidental events and severe local overloading.On the basis of summarizing the foreign progressive collapse resistance estimate and design methods, the basic concept of progressive collapse resistance is introduced in this paper. Combined with China's national conditions and《Standard for classification of seismic protection of building constructions》and the foreign code, the building progressive collapse resistance classification is proposed. A typical progressive collapse resistance ability of reinforced concrete multi-story frame structure is analyzed in this paper. The results show that: With the seismic intensity increases, the progressive collapse resistance ability of reinforced concrete multi-story frame structure will be enhanced. The progressive collapse resistance ability of reinforced concrete multi-story frame structure in low seismic intensity is poor. At the same time, the progressive collapse resistance ability of high-level story structure with beam transfer is discussed in this paper. The results show that: Once the corner and edge columns of supporting conversion beams are failure, the structure will collapse in a row; the middle columns of supporting conversion beams are failure, the risk of the structure collapse is high. On the basis of above research, strategies and measures about improving progressive collapse resistance ability of reinforced concrete structure are proposed.