【摘要】 跨度较大的梁由于弯矩较大,现阶段设计人员已普遍采用预应力混凝土,通过预应力的等效弯矩,部分减少各跨中、支座截面的拉应力,以达到同时满足抗裂和极限承载的要求,但如果设计施工不当,可能造成梁端弯矩远大于柱端,梁柱节点遭到削弱,以及柱抗震能力下降等不利于抗震的情况,本文主要针对这些问题从设计和施工两方面采取的优化措施进行论述。更多还原

【Abstract】 The big-span beams now have been widely designed with prestressed concrete because their moments are very large,The prestressed equivalent bending moments deduct the stretching stress of mid-span and beam end face,which can meet the requirements of crack-resistant and over-load.But the design and construction are not correctly,that can caused the beam support moment much bigger than the column,the coumn weaker and beam-column joint decreased.This paper summarized the seismic resistance optimum methods on these problems from design and construction.更多还原