[1]严泽华,李 扬,方昊天. 超低温下钢筋混凝土梁受弯挠度可靠度分析[J].湖北工业大学学报,2022,(4):81-85.
 YAN Zehua,LI Yang,FANG Haotian. Reliability Analysis of Bending Deflection of Reinforced Concrete Beams under Ultra-low Temperature[J].,2022,(4):81-85.
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 超低温下钢筋混凝土梁受弯挠度可靠度分析()
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《湖北工业大学学报》[ISSN:1003-4684/CN:42-1752/Z]

卷:
期数:
2022年第4期
页码:
81-85
栏目:
湖北工业大学学报
出版日期:
2022-08-28

文章信息/Info

Title:
 Reliability Analysis of Bending Deflection of Reinforced Concrete Beams under Ultra-low Temperature
文章编号:
1003-4684(2022)04-0081-05
作者:
 严泽华 李 扬 方昊天
 湖北工业大学土木建筑与环境学院, 湖北 武汉 430068
Author(s):
 YAN Zehua LI Yang FANG Haotian
 School of Civil Engin., Architecture and Environment Hubei Univ. of Tech., Wuhan 430068,China
关键词:
 超低温 钢筋混凝土 挠度 可靠指标 蒙特卡洛法
Keywords:
 ultra-low temperature reinforced concrete flexural deflection reliability monte carlo method
分类号:
TU311.2
文献标志码:
A
摘要:
 基于蒙特卡洛法,根据混凝土结构设计规范(2015年版)所给出的正常使用极限状态下的功能函数,分别引入各温度梯度混凝土抗拉强度变化系数m1,以及各温度梯度混凝土弹性模量变化系数m2。通过改变钢筋混凝土构件的温度、保护层厚度cs、弯矩效应比ρQk等,对超低温下钢筋混凝土梁受弯挠度控制进行可靠指标分析。得出:钢筋混凝土梁由常温20℃降至-160℃情况下,构件受弯挠度可靠指标β呈非线性增长,在-130℃达到最大值,随后略有减小;在低温各温度梯度下,混凝土强度等级与保护层厚度cs对受弯梁挠度控制可靠指标的影响最大,与常温下存在一定差异。
Abstract:
 Based on the Monte Carlo method, the coefficient of variation m1 of the tensile strength of concrete for each temperature gradient and the coefficient of variation m2 of the modulus of elasticity of concrete for each temperature gradient were introduced, respectively, according to the functional functions at the limit state of normal use given in the Code for the Design of Concrete Structures (2015 edition). By varying the temperature of the reinforced concrete member, the protective layer thickness cs, the bending moment effect ratioρQk, etc, the analysis of the reliability index for the control of bending deflection of reinforced concrete beams at ultra-low temperatures shows that: the reliability indexβ for bending deflection of reinforced concrete beams subjected to bending deflection increases non-linearly when the beam is lowered from room temperature 20℃ to -160℃, reaching a maximum value at -130℃; At each temperature gradient, the concrete strength grade and protective layer thickness cs have the greatest influence on the flexural beam deflection control, which is different from that at room temperature.

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备注/Memo

备注/Memo:
[收稿日期] 2021-05-27
[基金项目] 国家自然科学基金( 51508171);湖北省自然科学基金(2020CFB860);湖北省桥梁安全监控技术及装备工程技术研究中心开放基金(QLZX2014001)
[第一作者] 严泽华(1996-),男,福建福清人,湖北工业大学硕士研究生,研究方向为超低温钢筋混凝土梁的力学性能和可靠度
[通信作者] 李 扬(1986-),男,宁夏石嘴山人,工学博士,湖北工业大学副教授,研究方向为极端环境工程结构可靠性
更新日期/Last Update: 2022-08-29