计算模型对框架结构梁柱内力影响研究

结构抗震设计的基本原则之一是保证"强柱弱梁",但汶川地震等大量实际震害表明这一抗震设计目标并未能很好地实现。针对此问题,已开展大量研究,探讨了楼板、填充墙以及梁、柱、板配筋等因素对形成"强梁弱柱"的影响。本文则从计算模型方面,即结构分析中广泛采用的模型、精细有限元模型和楼板与梁分别考虑的模型,对梁柱内力影响进行了对比研究。结果表明,计算模型对梁、柱弯矩比有较大影响,是形成"强梁弱柱"的重要影响因素。

Study on influence of analytical models on internal forces of RC frames

"Strong column and weak beam" is one of the fundamental design principles for earthquake-resistant structures.However,this requirement is not well satisfied as shown in a lot of investigations of earthquake damage,including the Wenchuan earthquake.Extensive researches are done to explain that the floors,filling walls and reinforcement of structures affect the embodying of the principle ’strong beam and weak column’.In this paper,the internal forces of beams and columns are compared for different analytic model,including SFEM,FFFM and the peculiar model dealing floors and beams separately.Our results show that the moment ratio between beams and columns is most sensitive to different analytic models,which play a key role in embodying the principle ’strong beam and weak column’.