现浇楼板框架结构“强柱弱梁”屈服机制有限元分析与研究

Study on cast-in-place floor slab in frame structure achieving “strong column weak beam” mechanism by finite element analysis

结构抗震设计的基本原则之一是保证"强柱弱梁",设计期望结构在受到强震作用时梁先于柱破坏,通过梁铰消耗地震能量,避免结构倒塌。然而实际震害调查结果表明,框架结构并未实现预期的"强柱弱梁"型的破坏形态,反而更多的呈现为"强梁弱柱"的破坏模式。通过运用有限元软件,重点研究框架梁端两侧不同宽度范围内的楼板对框架结构"强柱弱梁"屈服机制形成的影响,并给出有效翼缘的建议取值以及改进的设计建议。

＂Strong column and weak beam＂ is one of the basic principles of structural seismic design.Under the action of the earthquake,we hope frame beam than the frame column breakage occurs first when we design the structures,and through the beam hinge consume the earthquake energy,avoid the structure collapse.However the actual seismic damage survey results show that the framework does not achieve the desired ＂strong column and weak beam＂ failure pattern,instead more show as ＂strong beam weak column＂ failure modes.This paper uses the finite element software to and further research the area of the cast-in-place floor slab to participate in the beam end bending and the influence degree of yield to formation mechanism of the framework structure.Finally,the effective flange recommended values and the improvement design suggestions are given.