【摘要】 考虑预应力混凝土结构的高强钢材以及预压应力的影响,预应力混凝土结构的截面延性能力相对较小。采用部分预应力混凝土截面能有效改善延性。为了提高预应力混凝土框架结构的抗震性能,设计时限制截面综合配筋指标以及预应力度,并控制梁的极限强度以保证强震时梁铰破坏机构的形成。各国规范基于上述研究结果,对框架梁端截面提出抗震设计有关条款。由于此设计要求与截面的正常使用阶段抗裂要求的设计目标相矛盾,导致截面高度因抗震要求而增加。为此,提出了强震下形成非梁端铰破坏机构的设计思路,并以算例论证按此方法设计预应力混凝土框架结构具备所需要的抗震能力。更多还原

【Abstract】 Due to the high|strength steel a nd prestress,the ductility of section of prestressed concrete frame becomes smal l.The ductility can be improved by adopting partial prestressed concrete section .In order to improve aseismic level of prestressed concrete frame,the prestress degree and reinforcement percentage will be limited.To form a beam hinging colla pse mechanism,the limit strength of beam should be controlled.In the light of th is thought,the codes of foreign countries have contained the requirement of asei smic design in the end section of frame beam.This requirement is incompatible wi th the crack resistance requirement,which results in the increase in beam height .This paper puts forward the design thought of a beam hinging collapse mechanism with non|end|section plastic hinges under strong earthquake and the aseismic capability of a prestressed concrete frame by this design thought is also demons trated by an example.更多还原