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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

36卷

期数:

2019年04期

页码:

31-39

栏目:

出版日期:

2019-07-25

文章信息/Info

Title:

Force Mechanism and Influencing Factors of Precast Monolithic Structures to Resist Progressive Collapse

文章编号:

1673-2049(2019)04-0031-09

作者:

黄 远^1,2,陈桂榕^1,2,胡晓芳^1,2

(1. 湖南大学 工程结构损伤诊断湖南省重点实验室,湖南 长沙 410082; 2. 湖南大学 土木工程学院,湖南 长沙 410082)

Author(s):

HUANG Yuan^1,2, CHEN Gui-rong^1,2, HU Xiao-fang^1,2

(1. Hunan Provincial Key Laboratory on Damage Diagnosis for Engineering Structures, Hunan University, Changsha 410082, Hunan, China; 2. College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China)

关键词:

装配整体式结构;  连续倒塌;  压拱机制;  悬链线机制;  影响因素

Keywords:

precast monolithic structure;  progressive collapse;  arch compression mechanism;  catenary mechanism;  influencing factor

分类号:

TU375

DOI:

-

文献标志码:

A

摘要:

为了研究压拱和悬链线阶段的受力机理,采用SAP2000软件建立了装配整体式框架(PCF)模型并用试验数据进行验证。在此基础上,建立了分析模型,选取A2模型对这2个阶段的受力机理进行了详细分析,然后将该阶段承载力与经典塑性铰理论承载力相比,定义了压拱和悬链线机制承载力提高系数η和ξ,研究了跨高比、层数、配筋率等参数对结构抗倒塌承载力的影响。结果表明:底部配筋率由0.44%增加到0.88%后,压拱机制承载力最大值F_u.a和悬链线机制承载力最大值F_u.c分别增加了37%和88.7%,η由1.25减少到1.22,ξ由1.06增加到1.45; 顶部配筋率由0.66%增加到1.03%后,F_u.a增大了25%,η由1.25减少到1.20,而F_u.c变化很小,ξ由1.57减少到1.16; 改变跨度导致跨高比由8增加到15时,F_u.a和F_u.c分别减小了67%和59%,η由1.33减小到1.18,ξ由1.44增加到1.59; 改变梁高导致跨高比由8增加到15时,F_u.a和F_u.c分别减小了87.7%和59.9%,η由1.35减少到1.08,ξ由1.44增加到3.85; 层数增加时,η减小,ξ增大; 侧向约束的刚度对悬链线效应的影响较大,当柱相对抗弯刚度大或侧向约束的跨数多时,悬链线效应对抗力的提高更为显著。

Abstract:

In order to study the force mechanism of arch compression and catenary stages, the monolithic precast concrete frame(PCF)models were established by SAP2000 and verified by experimental data. On the basis, the analysis models were established, and the A2 model was selected to analyze the mechanism of the two stages in detail. Then, the bearing capacities of two stages were compared with the classical plastic hinge theory, and the capacity increase coefficients of arch compression mechanism and catenary mechanism were defined as η and ξ respectively. The effects of parameters, such as span-to-height ratio, number of storey and reinforcement ratio and on the collapse resistance of the structure were studied. The results show that when the bottom reinforcement ratio increases from 0.44% to 0.88%, the maximum bearing capacities of arch compression mechanism F_u.a and catenary mechanism F_u.c increase by 37% and 88.7% respectively, and the value of η decreases from 1.25 to 1.22, and the value of η increases from 1.06 to 1.45. When the top reinforcement ratio increases from 0.66% to 1.03%, F_u.a increases by 25%, η decreases from 1.25 to 1.20, while F_u.c changes slightly, and ξ decreases from 1.57 to 1.16. When the span-height ratio increases from 8 to 15(changing the span), F_u.a and F_u.c decrease by 67% and 59% respectively, η decreases from 1.33 to 1.18, and ξ increases from 1.44 to 1.59. When the span-to-height ratio increases from 8 to 15(changing the height of beam), F_u.a and F_u.c decrease by 87.7% and 59.9% respectively, η decreases from 1.35 to 1.08, and ξ increases from 1.44 to 3.85. When the number of stories increases, η decreases, but ξ increases. The stiffness of lateral restraint has a great influence on the catenary effect. When the column's relative flexural stiffness is large or the number of spans with lateral restraint is large, the effect of catenary is more significant.

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备注/Memo

备注/Memo:

收稿日期:2018-11-16
基金项目:国家自然科学基金项目(51478174)
作者简介:黄 远(1982-),男,湖南长沙人,教授,博士研究生导师,工学博士,E-mail:huangy@hnu.edu.cn。

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更新日期/Last Update: 2019-07-26