建筑铝合金模架体系变形与承载力及可靠度的研究

发布时间：2018-04-20 06:08

本文选题：建筑铝合金模板 + 满堂支撑　；参考：《哈尔滨工业大学》2014年硕士论文

【摘要】：“绿色施工”受到越来越多的关注。建筑施工木模板因其质量差、木材消耗多等缺点，将会被逐步淘汰，取而代之的是新型节能、环保、绿色清洁的模板产品。建筑铝合金模板正是凭借优良的性能逐步走进工程人员的视线。建筑铝合金模架体系在国外已有几十年历史，配套技术相对成熟。在国内，铝合金模板发展的时间较短，人们对它的认识和了解不太充分。本文介绍了新型铝合金模架体系的种类、组成、施工工艺以及优缺点，认为提高周转使用次数是发挥铝合金模板优越性的关键所在，并从研发设计、施工管理等方面研究了如何提高铝合金模板的周转使用率。本文通过对铝合金模板进行集中荷载下的静力试验，研究了其在受力状态下的变形性能。运用ABAQUS对试验过程进行有限元模拟，试验结果和模拟结果吻合。通过有限元模拟，分析了施工期荷载作用下铝合金模板整体模型的受力和变形特点，并与工程实测值进行了对比分析。从可靠度的角度出发，建立了施工期墙面正常使用极限状态下的功能函数，通过考虑铝模板不同的加固变量（包括背楞计算长度、对拉螺杆间距和墙厚大小），研究了混凝土墙面面外变形可靠度指标的变化特点，得出了不同加固方式下的可靠度指标的大小。本文对单支撑变截面柱的承载力进行理论推导，分析无弯曲和有弯曲两种情况，得到了两者的理论承载力。通过数值模拟，对铝合金模板单支撑体系在施工期荷载作用下的静力受力特性进行了分析，并结合其它它因素给出建议：在3.2m层高以上，通过添加水平和纵向杆来提高单支撑体系的稳定性。运用Midas/gen对模板和支撑架进行整体有限元分析，得到了两者共同工作的特性：模板提供支撑架上部水平和纵向约束；支撑给模板提供足够的竖向约束。通过对满堂支架进行节点的半刚性试验并分析试验结果，认为随着周转使用次数的增加节点半刚性逐渐减小。运用Midas/gen对满堂支撑体系进行了线性屈曲分析，得到了其前七阶屈曲模态，其中第一阶模态为整体水平方向失稳。通过考虑几何和材料双重非线性，并采用在满堂支撑节点处施加1%等效水平力的方法（方向为第一阶模态）来替代初始缺陷的影响，得到了不同搭设参数下满堂支撑的极限承载力。分析了节点半刚性大小和壁厚大小对满堂支撑极限承载力的影响，结果表明两者影响非常突出。通过增大初始缺陷的方法来模拟满堂支撑周转使用次数的增加，研究了重复周转使用过程中满堂支架极限承载力的变化特点，，得出重复使用次数越多，满堂支撑极限承载力降低越多的结论。本文采用在节点处施加不同等效水平力的方法来模拟满堂支撑周转使用过程中初始缺陷的大小，通过建立施工期满堂支撑承载力极限状态下的功能函数力，对重复周转使用过程中满堂支撑承载力极限状态的可靠度进行研究，得到不同初始缺陷下满堂支撑承载力的可靠度指标。认为重复使用次数越多，可靠度指标降低越多。
[Abstract]:" Green construction " has been paid more and more attention . The building construction wood formwork will be phased out because of its poor quality , excessive wood consumption and so on . The building aluminum alloy formwork is a new energy - saving , environment - friendly and green - cleaning template product .

This paper introduces the kinds , composition , construction technology and advantages and disadvantages of the new aluminum alloy formwork system . It is believed that the improvement of turnover times is the key to the advantage of aluminum alloy formwork , and how to improve the turnover utilization rate of aluminum alloy formwork is studied from the aspects of R & D design , construction management and so on .

In this paper , the deformation behavior of the aluminum alloy formwork under the stress state is studied by the static test under concentrated load on the aluminum alloy formwork . The stress and deformation characteristics of the integral model of the aluminum alloy formwork under the action of the construction period are analyzed by the finite element simulation . The function function under the normal use limit state of the wall surface of the construction period is analyzed by the finite element simulation .

In this paper , the bearing capacity of a single - support variable - section column is theoretically deduced , and the theoretical bearing capacity of both is obtained . Through numerical simulation , the stability of single - support system is improved by adding horizontal and vertical rods .
This paper analyzes the influence of semi - rigid structure and wall thickness on the ultimate bearing capacity of the full - hall support system by considering the double nonlinearity of the geometrical and material , and uses the method of increasing the initial defect to simulate the change of the ultimate bearing capacity of the full - hall support .

In this paper , the method of applying different equivalent horizontal forces at the node is used to simulate the initial defects in the process of using the full - hall support swing , and the reliability index of the ultimate bearing capacity of the full - hall support in the process of repeated turnover is studied by establishing the function function force under the limit state of the full - hall support bearing capacity during the construction period . The reliability index of the full - hall support bearing capacity under different initial defects is obtained . The more the reuse times are considered , the more the reliability index decreases .

【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU755.2

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