建筑结构

2018, v.48;No.476(08) 29-33

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预应力混凝土框架内力重分布的试验研究
Experimental study on internal force redistribution of prestressed concrete frame

熊学玉;余鹏程;王怡庆子;
Xiong Xueyu;Yu Pengcheng;Wang Yiqingzi;Institute of Prestressed Structures,Tongji University;Key Laboratory of Advanced Civil Engineering Materials (Tongji University) ,Ministry of Education;

摘要(Abstract):

为了探讨预应力混凝土框架的梁端塑性转动特点和内力重分布规律,对3榀8m跨度的预应力混凝土框架进行了竖向静载试验及有限元非线性模拟分析。结果表明,适筋破坏的预应力混凝土框架,可产生充分的内力重分布现象,影响框架内力重分布的因素主要包括相对受压区高度、预应力度及次弯矩等;最后给出了以相对受压区高度及预应力度为自变量的框架梁梁端弯矩调幅的建议公式,并与规范公式进行了对比。
In order to study the plastic rotation and internal force redistribution of the end of the prestressed frame beam,a vertical static load experiment of three 8 m-span prestressed concrete frame was performed,and the non-linear analysis was also performed using finite element software. The results show that appropriate reinforced prestressed concrete frames can produce sufficient internal force redistribution. The main relating factors influencing internal force redistribution of the frame include the relative height of the compression zone,the prestressing degree and the secondary moment. Finally,a suggested calculation formula of the moment modification of frame beam end was presented with the relative height of the compression zone and the prestressing degree as coefficients. The formula was compared with that in code.

关键词(KeyWords): 预应力混凝土框架;内力重分布;弯矩调幅
prestressed concrete frame;internal force redistribution;moment modification

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基金项目(Foundation): 国家自然科学基金资助项目(51178328,5578400)

作者(Author): 熊学玉;余鹏程;王怡庆子;
Xiong Xueyu;Yu Pengcheng;Wang Yiqingzi;Institute of Prestressed Structures,Tongji University;Key Laboratory of Advanced Civil Engineering Materials (Tongji University) ,Ministry of Education;

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