后张有粘结预应力结构施工和服役期监测与仿真分析

发布时间：2018-01-06 20:28

本文关键词：后张有粘结预应力结构施工和服役期监测与仿真分析　出处：《辽宁工程技术大学》2015年硕士论文　论文类型：学位论文

【摘要】：预应力混凝土结构已经逐渐成为建筑结构的发展趋势。在大跨度预应力混凝土结构中,预应力筋多以抛物线形式布置,为了使预应力钢筋束充分发挥其作用,可以采用四段抛物线法布筋,然而由于这种方法在施工时很复杂、波纹管在绑扎时也要符合四段抛物线的形式,导致该方法在实际工程应用中还未能广泛应用。另外,由于预应力结构的各项损失将直接影响到钢筋束中建立的预应力,也会影响到预应力结构的性能,再加上结构在永久荷载和可变荷载长期作用下易受损坏,其相应的承载力和刚度会随着时间的增加而降低。这不仅会影响到建筑物的正常使用,也会缩短建筑物的寿命,进而影响到建筑物的安全。因此,有必要对大型公共建筑进行施工期监测和服役期监测,对建筑物的健康状况进行评估,并作出相应的工程决策,从而对该结构进行预警、报警以及保养、维修与加固。本文以阜新市规划展示馆、博物展示馆和市民活动中心(简称“两馆一心”)为背景,对博物展示馆部分预应力构件进行监测研究,主要包括以下内容：(1)从理论上对预应力混凝土结构在施工期间和服役期产生的预应力损失进行分析,重点分析了后张法施工时产生的预应力损失,并针对“两馆一心”中一后张有粘结预应力混凝土梁的各项损失进行理论计算。(2)在施工阶段,对“两馆一心”工程中采用四段抛物线布筋的主梁进行反拱度理论计算和现场实测,以检验预应力张拉的施工质量。并采用有限元软件ADINA进行反拱度数值模拟研究,将模拟值、理论值和监测值相比较,验证有限元软件模拟预应力结构的可行性。(3)在服役阶段,对整个预应力结构进行数值模拟研究,通过模拟分析各预应力梁产生不同的预应力损失,分析该损失对梁自身的挠度以及对结构其它梁的挠度产生的影响,确定各梁在服役期充当的角色,以此作为服役期监测的判断标准。(4)通过预埋在锚下的传感器,实时采集预应力梁的锚下应力,经由数据采集系统将采集到的数据统一收集到存储设备中,依据数值模拟的结果,当各梁锚下应力变化时,采取相应的措施,达到实时监测、预警和记录的功能。
[Abstract]:The prestressed concrete structure has gradually become the development trend of building structure. In large span prestressed concrete structure, prestressed tendons with parabolic prestressed reinforced beam arrangement, in order to give full play to its role in the four section of parabola Fabregas ribs, however by this method in the construction is very complex, the bellows must also comply with paragraph four parabola in the form of binding, leading to the method in practical engineering application is not widely used. In addition, due to the loss of prestressed structure will directly affect the establishment of prestressed steel beams, will also affect the performance of the prestressed structure, coupled with the structure in the long-term effect of the permanent load and variable load easily damaged and the corresponding bearing capacity and stiffness as time increases. This will not only affect the normal use of the building, will shorten the service life of buildings, Affect the safety of the building. Therefore, it is necessary for large public buildings were monitored during construction and service monitoring, to assess the health status of the building, and make the corresponding decision of project, and early warning of the structure, alarm and maintenance, repair and reinforcement. In this paper, Fuxin City Planning Exhibition hall, a museum display Museum and public activity center (referred to as the "two one") as the background, the museum exhibition hall of partially prestressed structure monitoring and research, mainly includes the following contents: (1) analysis on prestress loss of prestressed concrete structure during construction and service period in theory, focusing on analysis of the prestress losses due to post tensioned construction when, and for the "two one" in the loss of post tensioned bonded prestressed concrete beams were calculated. (2) in the construction stage, the "two one". In the process of the main girder of four parabolas reinforced were invertedcamber theoretical calculation and field measurement, to test the tension construction quality. And by using the finite element software ADINA simulation of the anti arch degree of numerical simulated values, the theoretical value and monitoring value comparison, simulation feasibility of prestressed structure is verified by finite element software. (3) in the service stage, numerical study of the prestressed structure, the prestressing loss of different through the simulation analysis of the prestressed concrete beam, the beam deflection analysis of loss of self and the influence of deflection of the beam structure of other production, determine the beam in service roles, as the criterion of service during the period of monitoring. (4) sensor buried in the anchor through the pre, real-time acquisition of the prestressed beam stress under anchor, through the data collecting system of unified data collection to the collection of storage equipment, according to the number of As the result of the value simulation, when the stress changes under the anchor of each beam, the corresponding measures are taken to achieve the function of real-time monitoring, early warning and recording.

【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU757

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