煤矸石多孔砖,孔型,应力-应变曲线,锚固长度,粘结机理,水平锚固,有限元分析,煤矸石多孔砖砌体水平灰缝中钢筋锚固长度的试验探讨
煤矸石多孔砖砌体水平灰缝中钢筋锚固长度的试验探讨
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煤矸石多孔砖砌体水平灰缝中钢筋锚固长度的试验探讨

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    近几年,我国大力推行墙体材料的革新,禁用实心粘土砖,开发新型墙材产品,推动墙体材料向环保化方向发展。在此政策背景下,诸如煤矸石、粉煤灰等非粘土原料生产的烧结砖得到了广泛应用。特别对于煤矸石,这种被视为固、液、气“三废”俱全的工业废料,它的资源化再利用,可以形成新的经济增长点,实现变废为宝,带来良好的经济效益、环境效益和社会效益。煤矸石多孔砖的推广应用不仅解决了煤矿产煤废料长期堆放污染环境的不足,而且对于推动我国居住建筑的节能工作具有重大意 义。而对于这种新型建筑材料在《砌体结构设计规范》中,各方面均缺少足够的试验研究和试验数据。尤其在抗震的构造措施部分,应用原有的针对粘土实心砖所得到的试验数据,已不能完全符合煤矸石多孔砖的材料要求。为了提高新型建筑材料砌体的抗震性能,特别是在大震下的变形能力,使新型墙体材料煤矸石多孔砖能得到安全,广泛的应用。充实《砌体结构设计规范》,使其更具可靠的科学依据,本课题通过拉拔试验,研究了钢筋在煤矸石多孔砖砌体灰缝中的粘结锚固机理及粘结应力分布,并提出钢筋在多孔砖水平灰缝中的倡议锚固长度。本课题通过阅读文献资料,在对国内外钢筋锚固理论和试验充分理解和掌握的基础上,进行了试验方案的确定,试件的制作。试验完成后,根据试验数据参考混凝土结构中钢筋锚固的研究策略进行了理论浅析浅析。在浅析浅析的基础上再通过试验现象,研究其工作机理,参照其它相关的科研成果对比浅析浅析,得出一般规律。最后用有限元软件对结果进行了有限元模拟。主要研究内容包括以下几个方面:1.理论浅析浅析:通过对钢筋与混凝土的粘结机理,浅析浅析钢筋与砂浆的粘结锚固机理;由钢筋在混凝土的锚固公式,对不带弯钩的直筋,总结出在砌体水平灰缝中钢筋锚固长度的计算公式。2.通过试验浅析浅析正应力、钢筋锚固长度、钢筋直径和砂浆强度等对钢筋粘结力影响及其影响程度。对比浅析浅析煤矸石多孔砖方孔和圆孔的破坏形式粘结力的大小,浅析浅析其破坏特点、产生机理和产生的理由。3.浅析浅析试验结果计算钢筋的平均粘结应力和钢筋的界限锚固长度。运用可靠度理论浅析浅析计算满足现行规范规定的可靠度的钢筋在多孔砖砌体中的近似锚固长度。并浅析浅析施工因素对钢筋锚固的影响,提出满足工程要求的钢筋锚固长度。4.在试验的基础上,采用ABAQUS有限元浅析浅析软件,对试验进行了有限元模拟,进一步浅析浅析了钢筋和砌体之间的受力性能。最后,对本文工作进行总结,对今后的研究做了展望。

    【Abstract】WwW.zIdiR.coM In recent years, China has been vigorously carrying out a reform for wall materials. Solid clay bricks are forbidden to be used and new wall materials are being developed. In this respect, China is going toward the direction of being environmentally-friendly. In accord with the state policy, baked bricks made from non-clay materials such as coal gangue, fly ash and others have been promoted for extensive applications. Especially coal gangue combining solid, fluid, gaseous industrial waste will become a new engine for economic growth through waste recycling. It will benefit economy, environment and society. The extensive application of coal gangue perorated bricks can not only solve the environmental pollution caused by tons of coal waste from coal mines but also contribute greatly to energy conservation in China’s domestic architecture.In the Design of Masonry Structures, there are inadequate experimental studies and data about this new type of building material. The application of the original data from the experiment concerning the clay bricks cannot match the material requirements of the coal gangue porous bricks, especially in the construction of the sei**ic fortification. In order to improve the sei**ic performance of the masonry of new building material, particularly the deformability in the earthquake, to make the coal gangue bricks of new building material safely and widely used, and to enrich the Design of Masonry Structures with more reliable scientific basis, this issue studies the bond anchorage mechani** and bond stress distribution of the rebar and proposes its anchorage length in the ash crack of porous bricks through pull-out experiment.Based on the full understanding and master of the foreign and domestic theories and experiments of bar anchorage, testing programs were planned and samples were made in this program with reference to relevant articles and materials. After the accomplishment of the testing programs, a theoretical analysis was made based on the results of the testing programs with a method similar to that of studying the bar anchorage in reinforced concrete structure. Experiments were done on the basis of the analysis in order to make out the working mechani**. To make a comparison, other research results were studied as a reference and thus the general law was deduced. Finally, finite elements simulation was done according to the results using the finite element software.The contents of this thesis are as follows:1. Theoretical Analysis: Through the bonding mechani** of steel bars and concrete, the bonding and anchoring mechani** of steel bars and mortar is analyzed; according to the anchorage formula of the reinforced concrete, for the staight steel bars with no hooks, conclude the anchorage length formula of of steel bars in the ash crack of the masonry joints is concluded.2. Through test, the impact of normal stress, anchorage length, diameter of the steel bar and mortar intensity on the cohesion of steel bars and its degree are analyzed. The features of destruction, its mechani**s and causes by comparative analysis of destructive cohesion of coal gangue perorated bricks with square holes and that with round holes are analyzed.3. The average cohesion and limit anchorage length of steel bars through analysing the result of test are calculated. The approximate anchorage length of steel bars, which meet the current specifications, in structures built by perorated bricks by reliability theory is calculated. Analyse the impact of construction factors on the anchorage of steel bars, and propose the anchorage length to meet the engineering requirements.4. Based on the test, using ABAQUS finite element analysis software, it was carryed out finite element simulation, then further analyze the mechanical properties between the steel bars and the masonry.Finally, the paper summarizes the work and put forward the future research.

    【关键词】 煤矸石多孔砖; 孔型; 应力-应变曲线; 锚固长度; 粘结机理; 水平锚固; 有限元浅析浅析;
    【Key words】 coal gangue perorated bricks; hole type; stress-strain curve; anchorage length; bonding mechani**; the level of anchoring; finite element analysis;
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