【作者】 韩峰；

【导师】 韩玉来；

【作者基本信息】 哈尔滨工程大学 ， 土木工程， 2025， 硕士

【摘要】 钢筋混凝土结构由于其出色的力学性能、相对低廉的造价、便于就地取材等特点使其在各个领域都有着广泛的应用,包括土木工程、航天工程、核工程等。然而随着近年来各类火灾事故的频发,火灾下钢筋混凝土结构构件的力学性能会大幅下降,甚至会导致建筑结构的破坏甚至倒塌,并伴随人员的伤亡以及不可估量的经济损失。目前国内外学者对钢筋混凝土构件在火灾高温下的基本力学性能研究较多,而对于火灾高温对结构构件振动频率的影响方面研究较少。并且由火灾高温引起的楼体变形会对居民造成进一步伤害,在此背景下,本文以火灾高温下钢筋混凝土梁柱构件为研究对象,旨在研究其在火灾前后振动频率的变化规律。主要内容如下:(1)总结国内外学者对火灾高温下钢筋混凝土结构的研究现状以及钢筋混凝土材料的热工性能和力学性能,为后续的钢筋混凝土梁柱构件的振动频率分析提供参数依据。(2)基于热传导理论和厚板积分理论等基本假定,列出火灾高温下钢筋混凝土梁柱构件的振动平衡方程,求解火灾高温下的钢筋混凝土梁柱构件振动频率的计算表达式。(3)根据所推导的计算表达式和火灾燃烧不同时刻梁柱构件的温度分布,对火灾高温下钢筋混凝土梁柱构件的振动频率变化进行分析,探究配筋率、柱长细比、截面形状等因素对梁柱构件振动频率的影响规律。(4)采用ABAQUS有限元软件对火灾燃烧不同阶段钢筋混凝土梁柱构件的振动频率变化进行数值模拟分析,并与理论计算结果及相关文献试验数据进行对比,以验证本文理论分析和有限元模拟结果的合理性。经对比结果可以得出,理论计算结果和有限元模拟结果、相关文献试验数据三者总体误差在25%,可行性较高。更多还原

【Abstract】 Reinforced concrete structures have been widely used in various fields,including civil engineering,space engineering,nuclear engineering,etc.,due to their excellent mechanical properties,relatively low cost,and ease of locally sourced materials.However,with the frequent occurrence of various types of fire accidents in recent years,the mechanical properties of reinforced concrete structural members under fire will be greatly reduced,and even lead to the collapse of the building structure,accompanied by casualties and incalculable economic losses.At present,scholars at home and abroad have studied more on the basic mechanical properties of reinforced concrete members under high temperature of fire,but less on the effect of high temperature of fire on the vibration of structural members.And the deformation of the building body caused by the high temperature of the fire will cause further damage to the residents,in this context,this paper takes the reinforced concrete beam and column members under the high temperature of the fire as the research object,aims to study the rule of change of its vibration before and after the fire.The main contents are as follows:(1)Summarize the current research status of domestic and foreign scholars on reinforced concrete structures under fire and high temperature as well as the thermal and mechanical properties of reinforced concrete materials,and provide a parametric basis for the subsequent vibration of reinforced concrete beam and column members.(2)Based on the basic assumptions of heat conduction theory and thick plate integral theory,the vibration equilibrium equations of reinforced concrete beam-column members under high temperature of fire are listed,and the computational expressions of the vibration of reinforced concrete beam-column members under high temperature of fire are solved.(3)According to the calculated expression and the temperature distribution of beam-column members at different moments of fire combustion,the vibration changes of reinforced concrete beam-column members under high temperature of fire are carried out to investigate the influence of reinforcement rate,column length to slenderness ratio,section shape and other factors on the vibration of beam-column members.(4)ABAQUS finite element software is used to numerically simulate the vibration changes of reinforced concrete beam-column members at different stages of fire combustion,and the results are compared with the theoretical calculations and related literature test data to verify the reasonableness of the theoretical and finite element simulation results in this paper.After comparing the results,it can be concluded that the overall error between the theoretical calculation results,finite element simulation results and related literature test data is 25%,which is highly feasible.更多还原