既有钢筋混凝土厂房的检测鉴定及承载能力可靠性分析
Abstract
After the reform and opening up, before the accumulation of manpower, material resources, technology, and ideas, coupled with the unprecedented liberation of agriculture, the development of industry has no worries. During the period of reform and opening up, the industry began its rapid development. A large number of industrial plants also began to be built in this period. Most of these factories were in service until the beginning of the 21st century. However, with the rapid development of technology and continuous improvement of industrial production, the load on existing plants has also increased at an exponential level. The use and service modes of some plants have also changed, and whether the original plant can continue to be safely produced. Whether the key components are reliable when they are subjected to existing loads is a problem that needs to be solved.
This article takes the existing industrial plant as the research object, this service plant is in service for a long time, is the product of the last century, its use and the use of the environment have changed. The on-site inspection performed the test and appraisal of the appearance and the use of the plant. The rebound strength method was used to measure the concrete strength of pillars, beams and other key components, and the deflection and carbonation depth of the key components of the plant were measured. Finally, the bearing capacity of key components was tested and identified according to the specifications. Then, based on the situation of on-site inspection, ANSYS finite element analysis software was used to perform finite element parametric modeling of some units of a single storey building, and Monte Carlo simulations were performed on the key parameters of the model using the PDS module provided by ANSYS. The Luo simulation uses Latin hypercube sampling. Among them, before the Monte Carlo simulation, the APDL language was used to perform post-processing on the ANSYS model, and the internal forces of the model were extracted. The key load-bearing positions with large internal forces were regarded as weak components. Then using the field data obtained from the test and the Monte Carlo simulation of the PDS module, the resistance and load conditions of the components were simulated, and the balance equations of resistance and load were established. Finally, the equations were translated into APDL language and imported into the analysis file of the PDS module. After carrying out
Monte Carlo simulation sampling for a certain number of times, it was found that the bearing capacity of key components did not meet the requirements. Subsequently, the same steps and sampling times were performed for analysis. The results were the same and the bearing capacity of key components was not reliable. Finally, in order to verify the results of Monte Carlo simulation analysis, the JC method was used to verify the bearing capacity of key components. Finally, the relevant provisions of the specification were compared to verify the results of PDS module analysis. After reaching the conclusion, according to factors such as the mechanical characteristics of the components, the convenience of construction, and other factors, a reasonable method for the reinforcement of the components is proposed.
Keywords：Existing single-storey factory building; Testing and identification ;Bearing capacity; Reliability study; ANSYS finite element analysis; PDS module
目录
第一章绪论 (1)
1.1引言 (1)
1.2可靠性理论的研究现状 (1)
1.2.1 国内外可靠性研究现状 (1)
1.2.2 可靠性研究在工程领域的研究 (3)
1.3 随机有限元法研究现状 (3)
1.3.1 随机有限元法发展现状 (3)
1.3.2 基于随机有限元的可靠性分析研究概况 (4)
1.4本文主要研究内容 (5)
第二章钢筋混凝土结构检测鉴定方法及可靠度理论 (7)
2.1建筑结构的检测鉴定及其加固 (7)
2.2结构可靠性理论 (8)
2.2.1结构构件的极限状态及状态方程 (8)
2.2.2结构的可靠性及可靠性指标 (9)
2.2.3可靠性分析的常用方法 (10)
2.3关于ANSYS的PDS模块在结构可靠性分析中的应用 (13)
2.3.1 ANSYS的PDS模块简介 (13)
2.3.2 PDS模块中的分析文件的建立 (14)
2.3.3 PDS模块中的GUI操作 (15)
2.4 PDS模块中的蒙特卡洛模拟 (17)
2.4.1 蒙特卡洛模拟中拉丁超立方抽样方法 (17)
2.6本章小结 (18)
第三章既有钢筋混凝土单层厂房的检测鉴定 (19)
3.1工程概况 (19)
3.2现场检测结果 (19)
3.2.1承重结构检测结果 (19)
3.2.2结构布置及支撑系统检测结果 (26)
3.2.3围护系统检测结果 (28)
3.2.4抗震构造 (29)
3.2.5墙体相对标高测量 (30)
3.2.5混凝土强度及碳化深度测量 (30)
3.3结构构件承载力校核 (31)
3.3.1校核原则、依据 (31)
3.3.2校核结果 (31)
3.4可靠性鉴定评级 (33)
3.4.1工业厂房可靠性鉴定评级方法和标准 (33)
3.4.2可靠性评级结果 (34)
3.5本章小结 (38)
第四章在役厂房部分有限元模型建立与可靠性分析实例 (40)
4.1有限元模型的建立 (40)
4.1.1基本建模参数 (40)
4.1.2模型单元选取 (40)
4.1.3工况的模拟 (41)
4.1.4建模结果及内力分析 (42)
4.2结构的承载力状态研究 (46)
4.2.1功能函数 (46)
4.2.2抽样参数的选择 (47)
4.2.3基于PDS模块的可靠性分析 (48)
4.3结构薄弱构件的可靠度分析 (53)
4.4本章小结 (53)
第五章基于JC法的关键构件可靠性验证 (55)
5.1关于JC法的简介 (55)
5.1.1当量正态化 (55)
5.1.2应用JC法求解 (56)
5.2应用JC法求解关键构件的可靠度 (56)
5.2.1 应用MA TLAB对JC法模拟 (56)
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5.3加固方法的建议 (58)
5.4本章小节 (59)
结论与展望 (60)
成果及结论 (60)
展望 (60)
参考文献 (63)