钢管膨胀混凝土收缩应变计算模型

发布时间：2018-03-27 09:50

本文选题：桥梁与隧道工程　切入点：计算模型　出处：《中南大学学报(自然科学版)》2015年03期

【摘要】：在室内自然环境下对3个混凝土圆柱体进行长期收缩变形试验研究,并采用最小二乘法对试验数据进行非线性拟合分析,研究钢管混凝土收缩机理。在钢管混凝土收缩机理研究基础上提出钢管膨胀混凝土收缩应变计算模型。研究结果表明:掺合膨胀剂对素混凝土初期(1 0 0 d内)收缩应变抑制较大,对后期收缩应变影响较小;对钢管混凝土收缩应变初期(3 0 0 d内)影响较大,初期收缩应变几乎不变;钢管混凝土收缩应变主要是核心混凝土自发收缩产生的,自发收缩应变约为1×1 0-4;计算模型考虑了膨胀剂含量、混凝土强度等级、水泥品种和养护方法对核心混凝土收缩影响,该计算模型可预估钢管膨胀混凝土收缩变形规律。
[Abstract]:In this paper, the long-term shrinkage and deformation of three concrete cylinders are studied in the indoor natural environment, and the nonlinear fitting analysis of the test data is carried out by using the least square method. The shrinkage mechanism of concrete-filled steel tube (CFST) is studied. Based on the research of shrinkage mechanism of CFST, a model for calculating shrinkage strain of concrete-filled steel tube (CFST) is proposed. The shrinkage strain is restrained greatly. The shrinkage strain of concrete filled steel tube is mainly produced by the spontaneous shrinkage of the core concrete, and the initial shrinkage strain is almost invariable, and the effect on the shrinkage strain of the concrete filled steel tube is less than that of the concrete filled steel tube in the early period of 300 days, and the initial shrinkage strain is almost unchanged. The strain of spontaneous shrinkage is about 1 脳 10 ~ 4. The influence of the content of expansive agent, the grade of concrete strength, the variety of cement and the curing method on the shrinkage of the core concrete is considered in the calculation model, which can be used to predict the shrinkage and deformation law of expansive concrete filled steel tube.
【作者单位】：湖南城市学院土木工程学院;湖南大学土木工程学院;
【基金】：湖南省自然科学基金资助项目(14JJ4062) 湖南省高等学校科学研究项目(重点项目)(12A027)~~
【分类号】：TU528.1

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