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装配式先张预应力混凝土框架结构研究初探Ⅰ:结构概念与弹性分析*
张小冬1,刘界鹏2,杨俊杰2,魏巍2,王宣鼎2
摘 要

(1 哈尔滨工业大学建筑设计研究院, 哈尔滨 150090; 2 重庆大学土木工程学院, 重庆 400045)

[摘要]装配式先张预应力混凝土框架是通过装配施工工艺,将先张预应力混凝土梁与预制混凝土柱先铰接后刚接而形成的一种新型结构。以某5层框架结构为例进行了内力分析,分别对比了设防烈度为7度(0-1g,0-15g)和8度(0-2g)时装配式先张预应力混凝土框架与现浇混凝土框架的弹性内力。分析结果表明,跟现浇混凝土框架相比,装配式先张预应力混凝土框架的梁端负弯矩绝对值降低了60%~80%。因此,跟普通的现浇混凝土框架相比,这种结构可有效降低框架梁端的负弯矩和纵筋配筋率,从而减少穿过框架节点区的梁纵筋数量,降低装配施工难度,提高装配施工效率;且这种框架结构能充分利用高强预应力筋,降低框架梁的钢筋用量,是一种具有良好综合效益的结构形式。

[关键词]装配式; 先张预应力结构; 混凝土框架; 弹性分析; 负弯矩

中图分类号:TU378-4文献标识码:A文章编号:1002-848X(2018)12-0001-04

 

Preliminary study on prefabricated pretensioned prestressed reinforced concrete frame (Ⅰ): structural concepts and elastic analysis

Zhang Xiaodong1, Liu Jiepeng2, Yang Junjie2, Wei Wei2, Wang Xuanding2

(1 The Architectural Design and Research Institute of HIT, Harbin 150090, China; 2 School of Civil Engineering, Chongqing University, Chongqing 400045, China)

Abstract:Prefabricated pretensioned prestressed reinforced concrete (RC) frame is a new type of structure by using assembling construction technology to connect the prestressed RC beam and precast RC column with stiff joint after hinged joint. The internal force analysis was carried out on a 5storey frame structure and the elastic stress of the prefabricated pretensioned prestressed RC frame and the cast-in-place RC frame were compared under the seismic fortification intensity of 7 degree (acceleration of 0-1g, 0-15g) and 8 degree (acceleration of 0-2g). The results indicate that the absolute value of  negative bending moment of the end of beams of prefabricated pretensioned prestressed RC frame was reduced by 60%~80% compared with that of the cast-in-place RC frame. Therefore, compared with the ordinary cast-in-place RC frame, the negative moment and longitudinal reinforcement ratio at the beam end were effectively reduced in this structure, resulting in the decrease of the longitudinal rebar through the frame joints. The difficulty of assembling construction was reduced and the prefabricated efficiency was improved. Besides, high-strength prestressed rebar was fully utilized to reduce rebar use in the RC beams. This is a kind of structural form with good comprehensive benefit.

Keywords:prefabricated; pretensioned prestressed structure; RC frame; elastic analysis; negative bending moment

 

*国家自然科学基金(51622802)。

 

作者简介:张小冬,硕士,教授级高级工程师,一级注册结构工程师,Email:163zhangxiaodong@163.com。

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