【作者】 江勇；

【导师】 段建中；

【作者基本信息】 合肥工业大学 ， 结构工程， 2003， 硕士

【摘要】 无粘结部分预应力混凝土结构是一种新型的加筋混凝土结构形式，它不需要预留孔道、穿筋、灌浆等复杂工序，简便了操作，加快了施工进度。无粘结预应力筋摩擦力小，且易弯曲成各种形状，特别适合建造需用复杂的连续曲线配筋的大跨度楼盖和屋盖。随着对无粘结预应力结构性能的研究，无粘结材料供应充足和轻型张拉千斤顶技术的发展，以及无粘结预应力楼盖在高层建筑结构中的普及，无粘接砼结构的优点已得到广泛的认可。但是，作为设计与施工人员，在无粘结预应力结构的设计与施工中，在充分发挥无粘结预应力作用地同时，应该注意尽可能减少无粘结预应力筋对柱截面削弱的影响。本试验以开洞比例为主要变化参数，并综合考察开洞形式、配箍、预应力的影响，通过13个节点实验的结果和理论分析得到以下几个结论：1、削弱面积的比例小于30％时，节点承载能力影响不大。2、孔道间距不能太小，相同开洞比例时，洞口数量多，半径小的形式承载能力稍高。3、实际工程中的解决方法和建议。更多还原

【Abstract】 Unbonded partially prestressed reinforced concrete (PPC) structure is a new form of Reinforced concrete (RC) structure, which need not set ducts, install tendons and grout in advance, so it is more convenient and quicken the rate of progress.The tendons of unbonded PPC have smaller fraction force and are easier to bend to many shapes, so it is more suited for building these rooms whose span are larger.With the study of the ability of unbonded PPC structure and the development of materials of unbonded PPC and the technique of light jack, the advantage of unbonded PPC structure has been widely recognized.However, as a designer or constructer, we should try our best to reduce the influence of the weakened states of column sections for frame, when we are engage in design or execution.This experimental research of 13 column beam joints takes the rate of ducts as a principal parameter, at the same time, the form of duct, the rate and ways of tendons and prestressing force are also considered.The results show that the influence of those ducts to the ultimate bearing capacity of the weakened section is not serious and the structure is safe if the rate is smaller than 30%. At the same time, we can get the following conclusions of the optimum style of the ducts and the settlements of actual projects.更多还原