环向预应力加固圆形钢筋混凝土筒仓的静力性能分析

发布时间：2018-01-26 02:56

本文关键词： 钢筋混凝土筒仓环向预应力加固 CFRP 贮料压力数值分析　出处：《北京交通大学》2013年硕士论文　论文类型：学位论文

【摘要】：钢筋混凝土筒仓具有占地面积小,仓容量大,维护费用低,便于机械化操作等诸多优点,因此被广泛应用于农业、建材、矿业、化工、电力等诸多领域。近年来随着预应力等技术的成熟,混凝土筒仓的直径和高度都有了很大提高。但是在使用过程中,超过半数筒仓仓壁会出现裂缝,并由此发生安全事故,造成重大经济损失。本文以某钢筋混凝土筒仓为研究对象,采用施加环向预应力加固的方法,进行数值计算,对位移、应力、应变等进行了详细分析。本文主要做了以下几个方面的工作： (1)分析钢筋混凝土筒仓在贮料荷载作用下的受力状态以及采用环向预应力加固之后的受力状态；选择适用于仓壁混凝土的应力-应变本构模型,并通过一个工程实例进行验算。 (2)根据工程实例,利用有限元软件ABAQUS建立筒仓加固数值模型。计算分析了使用预应力碳纤维增强复合材料(Carbon Fiber Reinforced Polymer,简称CFRP)加固前后仓壁的受力状态；将有无预应力加固工况进行了对比,证明了采用预应力加固的优越性。 (3)通过改变加固参数,分析了CFRP厚度、宽度以及加固形式等对加固效果的影响,不断优化得出最为合理的预应力加固方案。 (4)研究了采用钢板箍进行环向预应力加固筒仓的加固效果。
[Abstract]:Reinforced concrete silos are widely used in agriculture, building materials, mining and chemical industry because of their advantages such as small area, large storage capacity, low maintenance cost, convenient mechanization operation and so on. In recent years with the maturity of prestressing technology the diameter and height of concrete silos have been greatly improved but in the process of use more than half of silo walls will appear cracks. And the occurrence of safety accidents, resulting in significant economic losses. In this paper, a reinforced concrete silo is taken as the research object, the method of applying circumferential prestressing is used to carry out numerical calculation, and the displacement and stress are calculated. The main work of this paper is as follows: 1) analyze the stress state of reinforced concrete silo under storage load and the stress state of reinforced concrete silo reinforced by circumferential prestressing; The stress-strain constitutive model suitable for silo wall concrete is selected and checked by an engineering example. 2) according to the engineering example. The numerical model of silo reinforcement was established by using finite element software ABAQUS. Carbon Fiber Reinforced Polymer. The stress state of the silo wall before and after CFRP reinforcement; The superiority of prestressed reinforcement is proved by comparing the condition of prestressing reinforcement with or without prestressing. 3) by changing the reinforcement parameters, the influences of CFRP thickness, width and reinforcement form on the reinforcement effect are analyzed, and the most reasonable prestressing reinforcement scheme is obtained. 4) the effect of reinforcing silo with steel plate hoop is studied.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU375

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