高层住宅门式模板支架受力性能研究与工程应用

发布时间：2018-04-16 18:58

本文选题：门式模板支架 + 稳定承载力　；参考：《青岛理工大学》2013年硕士论文

【摘要】：近年来，随着我国城市化建设的高速发展，高层住宅通过“竖向”增长已经成为解决人口与土地矛盾的重要手段。高层住宅的兴起与普及，使现浇混凝土结构日渐增多，模板工程也得到了越来越广泛的重视。门式模板支架的工程应用在过去几年中已有较大发展，各科研院校对门式模板支架稳定承载力均展开相关研究。但工程上模板支架倒塌事故一直居高不下，安全问题一直成为各界关注的焦点。建筑市场上各种型号的门架鱼目混杂，往往缺乏科学的研究和论证，给施工企业在使用和管理上带来一定困难。结合高层住宅结构特点，创新研发一种新型门架MF1225，具有承载能力高、施工速度快、经济效益好等特点，特别在高层住宅标准层模板支设时，在保证施工安全的前提下，提高工效、缩短工期，降低了工程成本。为推进高层住宅门式模板支架的发展和应用，有必要对其进行系统科学的试验研究和理论分析。本文的主要研究内容如下：（1）对高层住宅门式模板支架进行承载力试验研究，通过试验现象、试验结果分析结构的稳定承载力和破坏特征，分析水平加固杆、扫地杆等对结构受力性能的影响，结果表明：四组门架单元体具有较高的承载力，破坏时门架均发生平面外失稳，，水平加固杆和扫地杆的设置使承载能力有所提高。（2）利用有限元分析软件ANSYS建立结构模型，从理论角度对模板支架进行承载力分析，挖掘影响承载力的关键因素，并与试验结果进行对比，发现分析结果与试验结果表现出相同的规律，验证了试验结果的可靠性。（3）根据试验研究和有限元分析结果，对门架MF1225立杆计算长度调整系数进行修正，提出其承载力简化计算公式，便于施工单位使用。（4）以结构可靠度理论为基础，运用ANSYS软件进行结构可靠性分析，并将材料、尺寸、荷载等作为输入参数进行灵敏度分析，结果表明：加固杆壁厚和钢材弹性模量对模板支架性能影响较大。（5）对高层住宅门式模板支撑体系的设计构造和安拆工艺进行应用研究，完善体系的规范化，以推进MF1225模板支架的工程应用。
[Abstract]:In recent years, with the rapid development of urbanization in China, the "vertical" growth of high-rise housing has become an important means to solve the contradiction between population and land.With the rise and popularization of high-rise residential buildings, cast-in-place concrete structures are increasing day by day, and formwork engineering has been paid more and more attention.The engineering application of portal formwork support has been greatly developed in the past few years.However, the collapse of formwork support has been high, safety issues have been the focus of attention.In the construction market, the various types of gantry fish are mixed, and often lack of scientific research and demonstration, which brings some difficulties to the use and management of construction enterprises.According to the characteristics of high-rise residential structure, a new type of door frame MF1225 is developed, which has the characteristics of high carrying capacity, fast construction speed and good economic benefit. Especially, when the formwork is set up in the standard layer of high-rise residential building, the safety of construction is ensured.Improve the working efficiency, shorten the time limit and reduce the project cost.In order to promote the development and application of high-rise residential door formwork, it is necessary to carry out systematic and scientific experimental research and theoretical analysis.The main contents of this paper are as follows:In this paper, the bearing capacity of the portal formwork support for high-rise residential buildings is studied. Through the experimental phenomena, the stability bearing capacity and failure characteristics of the structure are analyzed, and the effects of horizontal reinforcement bar and floor sweeping bar on the mechanical performance of the structure are analyzed.The results show that the four groups of gantry elements have higher bearing capacity. The failure of the portal frame occurs out of plane instability, and the setting of horizontal reinforcement rod and floor sweeping bar can improve the bearing capacity.2) using the finite element analysis software ANSYS to establish the structural model, analyze the bearing capacity of the formwork bracket from the theoretical point of view, excavate the key factors that affect the bearing capacity, and compare with the test results.It is found that the analysis results show the same rule as the test results, and the reliability of the test results is verified.3) based on the results of test and finite element analysis, the length adjustment coefficient of MF1225 vertical bar of portal frame is modified, and a simplified formula for calculating its bearing capacity is put forward, which is convenient for the use of construction units.Based on the theory of structural reliability, the structural reliability analysis is carried out by using ANSYS software, and the sensitivity analysis is carried out with materials, dimensions and loads as input parameters.The results show that the wall thickness and elastic modulus of steel have great influence on the properties of formwork support.In order to promote the engineering application of MF1225 formwork support system, the design and construction of door formwork support system and the process of installation and removal are studied in order to perfect the standardization of the system.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU755.2;TU974

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