【摘要】 针对钢筋混凝土框架结构,采用解析法,结合混凝土框架结构连续倒塌过程和抗力机制,分析了现浇楼板对结构抗连续性倒塌性能的影响,提出了考虑楼板效应的抗力计算方法。采用非线性静力Pushover方法分析现浇楼板对混凝土框架结构抗连续倒塌性能的影响,验证了解析法分析的正确性。结果表明,楼板对梁机制抗力的影响不明显,但对悬链线机制抗力的影响显著。对于边中柱初始失效情形,同时存在梁机制和悬链线机制两种抗连续倒塌机制,楼板可明显提高结构抗倒塌能力;对于角柱初始失效情形,仅存在梁机制而不能形成悬链线机制,楼板对结构的抗倒塌能力基本无影响。更多还原

【Abstract】 On the basis of process and resistance mechanism of progressive collapse for reinforced concrete frame structures,we analyzed the progressive collapse effect of cast-in-situ floor slab using the analytic method in this paper.Calculational method of resistance was given by considering floor slab effect.The influence of cast-in-situ floor slab on progressive collapse were also investigated by non-linear static pushover method,which verified the validity of the analytic method.The results indicated that the effect was not obvious on the beam mechanism resistance,but significant on the catenary mechanism resistance;in the case of the initial local damage of the middle-side column of the first floor,the progressive collapse resistance consisted of the beam mechanism and the catenary mechanism.Therefore,floor slab might provide the progressive collapse resistance.For the initial local damage of the corner column,only the beam mechanism could work without the catenary mechanism.Floor slab hawas found no effect on the progressive collapse resistance.更多还原