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装配式先张预应力混凝土框架结构研究初探Ⅱ:抗震弹塑性分析*
刘界鹏1,林旭川2,吴开来2,杨俊杰1,魏巍1,王宣鼎1
摘 要

(1 重庆大学土木工程学院, 重庆 400045; 2 中国地震局工程力学研究所,  哈尔滨 150080)

[摘要]装配式先张预应力混凝土框架是一种新型的结构形式,该结构采用先张预应力混凝土梁与预制混凝土柱先铰接后刚接的特殊施工方式,可有效降低框架梁端的负弯矩与配筋数量。基于纤维模型分别建立7度(0-1g,0-15g)和8度(0-2g)设防的现浇混凝土框架与装配式先张预应力混凝土框架的一系列弹塑性分析模型,提出了可考虑装配式先张预应力混凝土框架施工过程影响的建模方法。采用静力弹塑性推覆分析和动力弹塑性时程分析对建议的新型结构形式的抗震性能进行考察。结果表明,装配式先张预应力混凝土框架与现浇混凝土框架的整体抗震性能指标接近,在破坏模式与损伤细节上则存在不同程度的差异。装配式先张预应力混凝土框架的承载力比现浇混凝土框架高6%~12%,罕遇地震下装配式先张预应力混凝土框架最大层间转角比现浇混凝土框架高1%~13%。

[关键词]装配式; 先张预应力结构; 混凝土框架; 弹塑性分析; 抗震性能

中图分类号:TU378-4文献标识码:A文章编号:1002-848X(2018)12-0005-04

 

Preliminary study on prefabricated pretensioned prestressed reinforced concrete frame (Ⅱ):elastic-plastic seismic analysis

Liu Jiepeng1, Lin Xuchuan2, Wu Kailai2, Yang Junjie1, Wei Wei1, Wang Xuanding1

(1 School of Civil Engineering, Chongqing University, Chongqing 400045, China; 2 Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, 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. This construction method can effectively reduce the negative bending moment and longitudinal reinforcement ratio at the beam ends. A series of elastic-plastic structural analysis models based on the fiber model were constructed for prefabricated pretensioned prestressed RC frames and ordinary cast-in-situ RC frames, with the designed seismic fortification intensity ranging from 7 degree (acceleration of 0-1g and 0-15g) to 8 degree (acceleration of 0-2g). A modeling procedure was proposed considering the effect of the construction process of prefabricated pretensioned prestressed RC frame. Both the static elastic-plastic Pushover analysis and dynamic elastic-plastic time-history analysis were carried out to examine the seismic performance of the proposed new structure. Results show that the prefabricated pretensioned prestressed RC frames and ordinary cast-in-situ RC frames are close in terms of overall seismic performance, but there are differences in damage patterns and damage details. The load-carrying capacity of prefabricated pretensioned prestressed RC frames is 6%~12% higher than that of cast-in-place RC frames. The maximum story drift angle of prefabricated pretensioned prestressed RC frames under rare earthquakes is 1%~13% higher than that of cast-in-place concrete frames.

Keywords:prefabricated; pretensioned prestressed structure; RC frame; elastic-plastic analysis; seismic performance

 

*国家自然科学基金(51622802,51678542)。

 

作者简介:刘界鹏,博士,教授,博士生导师,Email: liujp@cqu.edu.cn。

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