本文選題：砌體　切入點(diǎn)：植筋　出處：《湖南大學(xué)》2015年碩士論文

【摘要】：近些年,由于建筑工程中日益增多的建筑翻新、建筑改擴(kuò)建以及大量新建工程施工的需要,后錨固技術(shù)的研究及應(yīng)用的重要性日益彰顯。后錨固連接是設(shè)備安裝、結(jié)構(gòu)改造和加固中較常用的連接方式,它通過(guò)錨栓或植筋使新增構(gòu)件與原有構(gòu)件有效連接,并傳遞荷載。在我國(guó),雖然后錨固研究起步較晚,但近年來(lái)其應(yīng)用范圍較廣泛。中國(guó)建筑工業(yè)出版社出版的《混凝土結(jié)構(gòu)后錨固技術(shù)規(guī)程》(JGJ145-2013)全面系統(tǒng)地介紹了后錨固技術(shù)。但《混凝土結(jié)構(gòu)后錨固技術(shù)規(guī)程》針對(duì)的基材為混凝土,而現(xiàn)在廣泛使用的砌體結(jié)構(gòu)的后錨固技術(shù)并沒(méi)有一個(gè)系統(tǒng)完善的設(shè)計(jì)理論。應(yīng)《砌體結(jié)構(gòu)后錨固技術(shù)規(guī)程》編撰的需要,為在砌體基材上的后錨固技術(shù)提供指導(dǎo),本文通過(guò)在蒸壓粉煤灰磚、蒸壓灰砂磚、燒結(jié)普通磚砌體上的后錨固化學(xué)植筋在靜力作用下的拉拔試驗(yàn)研究,分析了砌體上后錨固的破壞模式和影響拉拔承載力的因素,并利用ABAQUS有限元分析軟件對(duì)植筋拉拔試驗(yàn)進(jìn)行數(shù)值模擬。本文主要工作如下:1.對(duì)以蒸壓粉煤灰磚和蒸壓灰砂磚砌體為基材的植筋試件,研究鋼筋外形、鋼筋直徑、基材種類(lèi)對(duì)拉拔承載力的影響,測(cè)量鋼筋應(yīng)變、植筋試件加載端的滑移量,繪制荷載-滑移曲線,分析植筋的滑移特點(diǎn)。2.對(duì)以燒結(jié)普通磚砌體為基材的植筋試件,研究植入位置、鋼筋外形、鋼筋直徑、錨固深度對(duì)拉拔承載力的影響,測(cè)量植筋試件加載端的滑移量,繪制荷載-滑移曲線,分析植筋的滑移特點(diǎn)。3.根據(jù)磚砌體、鋼筋和錨固膠的特點(diǎn)及其粘結(jié)滑移關(guān)系,運(yùn)用ABAQ US有限元分析軟件對(duì)植筋拉拔試驗(yàn)進(jìn)行數(shù)值分析。并與試驗(yàn)結(jié)果對(duì)比,驗(yàn)證了有限元模型的可行性。本文在對(duì)化學(xué)植筋后錨固技術(shù)性能在國(guó)內(nèi)外的發(fā)展和應(yīng)用作了大量調(diào)查研究的基礎(chǔ)之上,通過(guò)試驗(yàn)研究及數(shù)值分析,對(duì)植筋的破壞形態(tài)、承載力和滑移性能做了初步剖析。在保證施工質(zhì)量的前提下,在磚砌體上錨固深度為10d~14d的化學(xué)植筋后錨固具有一定承載力,增大鋼筋直徑、錨固深度或基材強(qiáng)度可以提高植筋極限拉拔承載力,其破壞形式為脆性破壞,不適用于重要承重構(gòu)件,但可用于一般的附屬構(gòu)件(如掛件等)。
[Abstract]:In recent years, the importance of the research and application of post-anchoring technology is becoming more and more obvious because of the increasing number of building renovation, building reconstruction and extension, and a large number of new construction projects. The post-anchoring connection is the installation of equipment. The more commonly used connection method in structural reconstruction and reinforcement is that the new members are effectively connected with the original members through anchor bolt or reinforcement, and the load is transferred. In our country, although the post-anchoring research started late, In recent years, however, it has been widely used. JGJ145-2013, published by China Construction Industry Publishing House, introduces the post-anchoring technology in a comprehensive and systematic way. But the "Technical Specification for Post-Anchorage of concrete structures" aims at. The base material is concrete, However, there is no systematic and perfect design theory for the post-anchoring technology of masonry structure, which is widely used now. It is necessary to compile the "Technical Specification for Post-Anchorage of masonry structure" to provide guidance for the post-anchoring technology on the masonry base material. This paper analyzes the failure mode of post-anchoring on the autoclaved pulverized coal brick, autoclaved lime-sand brick and sintered ordinary brick masonry under static force, and analyzes the factors influencing the drawing capacity. The main work of this paper is as follows: 1. The main work of this paper is as follows: 1. The steel bar shape and the diameter of steel bar are studied by using autoclaved fly ash brick and autoclaved lime sand brick masonry as the base material. The effect of the type of base material on the drawing capacity, measuring the strain of steel bar, the slip amount at the loading end of the steel bar specimen, drawing the load-slip curve, analyzing the slip characteristics of the steel bar, and analyzing the slip characteristics of the steel bar. 2. For the sintered ordinary brick masonry as the base material, the sintered steel bar specimen, The influence of placement position, shape of steel bar, diameter of steel bar and depth of anchoring on the bearing capacity of tensile drawing is studied. The slip amount at the loading end of the specimen is measured, the load-slip curve is drawn, and the slippage characteristics of the steel bar are analyzed. 3. According to the brick masonry, The characteristics of reinforcing bar and anchoring glue and their bond-slip relationship are analyzed numerically by using ABAQ US finite element analysis software, and the results are compared with the test results. The feasibility of the finite element model is verified. On the basis of a large number of investigations and studies on the development and application of the anchoring technology after chemical reinforcement planting at home and abroad, the failure pattern of the rebar is analyzed by means of experimental research and numerical analysis. The bearing capacity and slippage properties are analyzed preliminarily. On the premise of ensuring the construction quality, the anchoring of the chemical reinforcement with the depth of 10d~14d on the brick masonry has a certain bearing capacity and increases the diameter of the steel bar. Anchoring depth or base material strength can increase ultimate pull-out bearing capacity of steel tendons. The failure form is brittle failure, which is not suitable for important load-bearing members, but can be used in general auxiliary members (such as pendants, etc.).
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TU364

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