在役升降网架结构的力学性能检测与评估

发布时间：2019-05-10 17:34

【摘要】：结合公安部天津消防研究所试验馆升降网架结构,研究了老龄化升降网架结构力学性能的检测和评估方法.制定了一套检测方案,对网架结构的支座、吊点、整体挠度、锈蚀等情况进行了全面检测,分析了吊顶在升降过程中重要构件的应力变化.基于检测数据,建立了吊顶网架锈蚀前后的数值模型,分析了锈蚀厚度对不同工况下网架结构主要力学指标的变化情况.检测结果表明:网架基本情况较好,支座、吊点均连接稳固,整体最大挠度79,mm,满足要求.网架升降过程中,多数杆件处于弹性工作阶段,经过升降过程,能恢复到初始状态.4个吊点附近应力变化明显,部分杆件出现明显弯曲现象.进一步分析锈蚀模型,发现在起吊和未起吊两个工况下,网架的最大应力和最大位移均随着锈蚀厚度的增大呈现二次曲线增长.
[Abstract]:Combined with the lifting grid structure of Tianjin Fire Research Institute of Ministry of Public Security, the testing and evaluation method of mechanical properties of aging lifting grid structure is studied. A set of detection scheme is worked out, and the bearing, hanging point, overall deflection and corrosion of the grid structure are comprehensively detected, and the stress changes of the important components in the lifting process of the ceiling are analyzed. Based on the detection data, the numerical model before and after corrosion of ceiling grid is established, and the variation of corrosion thickness to the main mechanical indexes of grid structure under different working conditions is analyzed. The test results show that the basic condition of the grid is good, the support and hanging point are connected stably, and the overall maximum deflection is 7.9 mm, which meets the requirements. In the process of grid lifting and lifting, most of the members are in the elastic working stage, and after the lifting process, they can recover to the initial state. The stress near the four lifting points changes obviously, and some members appear obvious bending phenomenon. Furthermore, the corrosion model is further analyzed, and it is found that the maximum stress and maximum displacement of the grid increase with the increase of corrosion thickness under the two working conditions of lifting and unhoisting.
【作者单位】：滨海土木工程结构与安全教育部重点实验室(天津大学);天津大学建筑工程学院;
【基金】：全国优秀博士学位论文作者专项资金资助项目(201453)
【分类号】：TU356

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