混凝土浇筑期施工荷载的统计分析

发布时间：2019-02-23 23:57

【摘要】：近年来,国内在施工过程中混凝土浇筑期间模板支撑体系倒塌的事故屡见不鲜,对荷载估计不足是事故发生的主要原因之一,而相关研究不足。本文以混凝土浇筑期楼面活荷载(包括施工人员荷载、设备荷载和混凝土荷载)为研究对象,进行荷载调查和统计,主要工作和结论如下： (1)对人员体重荷载,在施工现场测量五百多组人员体重,对测量结果统计分析,得出体重服从正态分布,给出均值和方差； (2)现场统计设备荷载,并参考相关文献求得最后的荷载值； (3)通过目标立杆的影响面,考虑荷载最不利分布,并根据等效影响面高度求出在人员荷载及设备荷载下目标立杆所受荷载的标准值； (4)在43个工地调研,采集了610个混凝土堆积高度的样本值,分别采用cos曲面和二维正态分布曲面拟合浇筑图形求最优分布,并用最优分布求出每个测量单元的等效厚度,求等效厚度与设计厚度的比值,并对比值进行拟合检验,得出其服从正态分布,给出均值和方差,最后给出混凝土荷载的标准值。
[Abstract]:In recent years, the accidents of formwork bracing system collapse during the construction process in China are common. The underestimation of load is one of the main causes of the accidents, and the related research is insufficient. In this paper, the living load of concrete floor during pouring period (including construction personnel load, equipment load and concrete load) as the research object, load investigation and statistics, the main work and conclusions are as follows: (1) load on the person weight, The body weight of more than 500 groups of people was measured in the construction site. The statistical analysis of the measurement results showed that the weight clothing was normal distribution and the mean value and variance were given. (2) the load of equipment is counted on the spot, and the final load value is obtained by referring to the relevant documents; (3) through the influence surface of the target shaft, considering the most unfavorable distribution of the load, and according to the equivalent influence surface height, the standard value of the target shaft load under the human load and the equipment load is obtained. (4) based on the investigation of 43 sites, the sample values of 610 concrete stacking heights were collected, and the cos surface and the two-dimensional normal distribution surface were used to fit the pouring figure to obtain the optimal distribution, respectively. The equivalent thickness of each measuring unit is obtained by the optimal distribution, and the ratio of the equivalent thickness to the designed thickness is calculated. The fitting test is carried out by comparing the values, and the normal distribution is obtained, the mean value and the variance are given, and the standard value of concrete load is given.
【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】：TU755

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