高桩码头轨道梁在循环及温度作用下疲劳寿命耦合分析
发布时间：2018-09-06 16:57
【摘要】：钢筋混凝土结构件长期在疲劳荷载作用下会影响其正常使用,甚至危及人们生命财产安全。疲劳荷载作用下钢筋混凝土结构件的破坏是一个极其复杂的损伤累积过程。梁板式高桩码头在港口工程中应用有很久的历史,也是最主要的码头结构形式之一。暴露在自然环境中的门机轨道梁受到的疲劳荷载不仅有门机荷载,同时还有温度荷载等。门机轨道梁在这两种疲劳荷载共同作用下,疲劳损伤逐渐累积直至发生破坏。因而对门机轨道梁在门机及温度荷载共同作用下进行疲劳性能研究,准确识别出其危险部位、损伤程度,预测其疲劳寿命是很有必要。本文以黄冈某在建梁板式高桩码头为依托,研究该高桩码头的门机轨道梁在门机及温度荷载耦合作用下的动力响应,并结合已有钢筋、混凝土应力寿命函数对门机轨道梁疲劳寿命进行预测。本文的主要研究内容及结论如下:(1)通过对多种已有钢筋及混凝土疲劳寿命预测模型进行比较分析,然后从这些模型中选择出适合门机轨道梁疲劳寿命预测的模型。最后分别对受压区的混凝土和受拉区的钢筋进行疲劳寿命预测。本文还探讨温度、门机荷载等因素对门机轨道梁疲劳寿命的影响规律。(2)本文通过数值模拟探究门机轨道梁在门机及温度荷载共同作用下的疲劳性能,分析发现门机及温度荷载耦合作用下的耦合应力并不是二者简单线性叠加。具体表现为:在门机荷载为350KN/轮不变的情况下,当梁上下表面温度差小于10℃时,耦合应力小于门机单独作用下产生的应力,此时温度荷载所产生的应力对门机轨道梁延长疲劳寿命是有利的。当温度差大于10℃后,耦合应力逐渐大于门机单独作用下产生的应力,但小于门机及温度荷载单独作用下产生应力按线性叠加的应力,此时温度荷载所产生的应力会降低门机轨道梁的疲劳寿命。(3)针对门机轨道梁在施工、运营可能出现的疲劳损伤,文中提出在钢筋混凝土结构件中掺入钢纤维以延长门机轨道梁疲劳寿命的措施。这对确保高桩码头结构整体安全性能,提高经济效益意义重大。
[Abstract]:Reinforced concrete structure can affect its normal use and even endanger the safety of people's life and property under fatigue load for a long time. The failure of reinforced concrete structures under fatigue load is an extremely complicated damage accumulation process. Beam-plate high-pile wharf has a long history of application in port engineering and is one of the most important wharf structures. The fatigue load of portal crane track beam exposed to natural environment is not only door crane load, but also temperature load. Under the combined action of these two kinds of fatigue load, the fatigue damage of portal crane track beam accumulates gradually until failure occurs. Therefore, it is necessary to study the fatigue performance of portal crane track beam under the combined action of door crane and temperature load, identify its dangerous position, damage degree and predict its fatigue life accurately. In this paper, the dynamic response of the portal crane track beam of the high pile wharf under the coupling of the door crane and the temperature load is studied based on a beam-slab high pile wharf under construction in Huanggang, and combined with the existing steel bar. The concrete stress life function is used to predict the fatigue life of portal crane track beam. The main contents and conclusions of this paper are as follows: (1) through the comparison and analysis of various existing fatigue life prediction models of reinforced and concrete beams, the models suitable for predicting fatigue life of portal crane track beams are selected from these models. Finally, the fatigue life of concrete in compression zone and steel bar in tension zone are predicted. This paper also discusses the influence of temperature, portal crane load and other factors on the fatigue life of portal crane track beam. (2) the fatigue performance of portal crane track beam under the combined action of door crane and temperature load is studied by numerical simulation. It is found that the coupling stress under the coupling of the door crane and the temperature load is not a simple linear superposition of the two. The concrete performance is as follows: when the load of the portal crane is 350KN/ wheel invariant, when the temperature difference between the upper and lower surface of the beam is less than 10 鈩，
本文编号：2226974
[Abstract]:Reinforced concrete structure can affect its normal use and even endanger the safety of people's life and property under fatigue load for a long time. The failure of reinforced concrete structures under fatigue load is an extremely complicated damage accumulation process. Beam-plate high-pile wharf has a long history of application in port engineering and is one of the most important wharf structures. The fatigue load of portal crane track beam exposed to natural environment is not only door crane load, but also temperature load. Under the combined action of these two kinds of fatigue load, the fatigue damage of portal crane track beam accumulates gradually until failure occurs. Therefore, it is necessary to study the fatigue performance of portal crane track beam under the combined action of door crane and temperature load, identify its dangerous position, damage degree and predict its fatigue life accurately. In this paper, the dynamic response of the portal crane track beam of the high pile wharf under the coupling of the door crane and the temperature load is studied based on a beam-slab high pile wharf under construction in Huanggang, and combined with the existing steel bar. The concrete stress life function is used to predict the fatigue life of portal crane track beam. The main contents and conclusions of this paper are as follows: (1) through the comparison and analysis of various existing fatigue life prediction models of reinforced and concrete beams, the models suitable for predicting fatigue life of portal crane track beams are selected from these models. Finally, the fatigue life of concrete in compression zone and steel bar in tension zone are predicted. This paper also discusses the influence of temperature, portal crane load and other factors on the fatigue life of portal crane track beam. (2) the fatigue performance of portal crane track beam under the combined action of door crane and temperature load is studied by numerical simulation. It is found that the coupling stress under the coupling of the door crane and the temperature load is not a simple linear superposition of the two. The concrete performance is as follows: when the load of the portal crane is 350KN/ wheel invariant, when the temperature difference between the upper and lower surface of the beam is less than 10 鈩，
本文编号：2226974
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