箱型截面钢井架天轮平台梁数值计算方法研究

发布时间：2018-05-20 20:07

本文选题：天轮平台梁 + 箱型截面　；参考：《中国矿业大学》2015年硕士论文

【摘要】：天轮平台梁是煤矿钢结构井架的关键受力构件。目前对钢结构井架天轮平台梁进行数值计算时,均假定为梁单元。近年来煤矿采用箱型截面钢结构井架日益增多,此种截面的井架天轮平台梁高跨比很小,受力性能与一般梁有较大差异,将其假定为梁单元进行数值计算不精确。所以在箱型截面钢结构井架的研究中,准确地总结出天轮平台梁结构的受力分布规律,并找到一种可靠的数值计算方法是一项非常重要的工作。本文以某煤矿箱型截面钢结构井架天轮平台梁为研究对象,首先通过箱型截面天轮平台梁室内相似模型试验,研究了天轮平台梁结构在荷载作用下的受力分布规律。试验结果表明:箱型截面天轮平台梁不符合普通梁结构整体受力较为均匀、梁底跨中内力最大等规律,将其假定为梁单元进行数值计算的方法不够准确;在正常提升及断绳荷载作用下,箱型截面天轮平台梁的应力值均低于Q235钢的屈服强度,满足承载力要求。然后,通过有限元软件ANSYS中的壳单元对箱型截面天轮平台梁进行数值模拟,与上述室内相似模型试验结果进行对比分析。研究表明:室内试验测得数据与数值模拟计算结果基本吻合,误差在5%左右,考虑到物理模拟误差以及数值计算参数取值的偏差,认为室内试验和数值模拟计算可以互相验证,证明采用壳单元对箱型截面天轮平台梁进行数值模拟是一种可靠地数值计算方法。最后,以某矿区现役箱型截面钢井架为工程背景,采用仪器对该井架天轮平台梁进行现场测试,所测数据跟数值计算结果基本吻合,认为两者可以互相验证,进一步证明本文采用的天轮平台梁数值计算方法是可靠的。
[Abstract]:Sky wheel platform beam is the key force member of coal mine steel structure Derrick. At present, the steel Derrick platform beam is assumed to be a beam element. In recent years, the use of box section steel structure Derrick in coal mine is increasing day by day. The ratio of height to span of this section is very small, and the mechanical performance is quite different from that of general beam, so it is assumed that the numerical calculation of beam element is not accurate. Therefore, in the research of box section steel structure Derrick, it is very important to accurately sum up the stress distribution law of the platform beam structure, and find a reliable numerical calculation method. In this paper, the steel Derrick Derrick platform beam with box section in a coal mine is taken as the research object. Firstly, through the indoor similarity model test of the box section sky wheel platform beam, the stress distribution law of the box section steel Derrick platform beam structure under the action of load is studied. The test results show that the box section sky-wheel platform beam does not accord with the law of uniform force and maximum internal force in the bottom span of the beam, so the numerical calculation method is not accurate enough to assume the beam element as the beam element. Under the action of normal hoisting and rope breaking, the stress values of the box section sky wheel platform beam are lower than the yield strength of Q235 steel, which meets the bearing capacity requirements. Then, the shell element of the finite element software ANSYS is used to simulate the box section sky wheel platform beam, and the results are compared with the results of the indoor similar model test. The results show that the measured data are in good agreement with the numerical simulation results, and the error is about 5%. Considering the deviation of the physical simulation error and the value of the numerical calculation parameters, it is considered that the indoor test and the numerical simulation calculation can verify each other. It is proved that the shell element is a reliable numerical method to simulate the box section sky wheel platform beam. Finally, based on the in-service box section steel Derrick of a mining area, the field test of the platform beam of the Derrick is carried out by means of the instrument. The measured data are in good agreement with the numerical calculation results, and it is considered that the two can be verified each other. It is further proved that the numerical method used in this paper is reliable.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD223

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