整孔预制架设48米活性粉末混凝土简支箱梁的设计及分析
发布时间：2019-04-27 03:12
【摘要】：本文将活性粉末混凝土(Reactive Powder Concrete,简称RPC)材料的优点与箱型截面梁的优点相结合,提出了大跨度整孔预制架设48米RPC简支箱梁的结构构想,主要阐述以下三个方面的内容： (1)对整孔预制架设48米RPC简支箱梁进行了变形、应力、抗裂性计算分析；对其极限承载力进行理论计算,并通过有限元软件分析了跨中截面挠度随荷载等级变化曲线、跨中截面上缘应力及下缘应力随荷载等级变化曲线；求解了48米RPC简支箱梁的自振频率和振型；与32米普通混凝土箱梁进行经济性对比分析。 (2)进行了整孔预制架设48米RPC简支箱梁的预制工艺分析,包括RPC的材料及配合比、搅拌、运输、浇筑、振捣工艺及养护制度；分析了普通混凝土与RPC共同作用性能；为今后大跨度RPC简支箱梁在实际工程中的应用提供了参考。 (3)基于现行的32米运架设备,提出了整孔架设48米RPC简支箱梁的运架设备改造方案。 通过上述计算与分析,验证了大跨度整孔预制架设48米RPC简支箱梁结构的可行性。采用RPC设计整孔预制架设48米简支箱梁将大幅度减小结构自重,其力学性能满足现有规范的要求：无需重新设计和研制大吨位运架设备,只需对现有运架设备进行简单的改造和加固,就能够实现整孔预制48米RPC简支箱梁的架设,不会造成既有设备的闲置和浪费。 本文作为一种尝试性研究,为今后RPC在工程领域的应用和研究提供参考。
[Abstract]:In this paper, the advantages of reactive powder concrete (Reactive Powder Concrete,) material and box section beam are combined, and the structure conception of 48 m RPC simply supported box girder with long span whole hole precast is put forward. The main contents of this paper are as follows: (1) the deformation, stress and crack resistance of 48 m RPC simply supported box girder are calculated and analyzed. The theoretical calculation of the ultimate bearing capacity is carried out, and the curves of the deflection of the middle span with the load grade, the upper edge stress and the lower edge stress of the span middle section with the load grade are analyzed by finite element software. The natural vibration frequency and mode shape of 48m RPC simple-supported box girder are solved and compared with 32-meter ordinary concrete box girder. (2) the prefabrication process of 48 m RPC simply supported box girder is analyzed, including the material and mix ratio of RPC, mixing, transportation, pouring, vibrating technology and maintenance system, and the interaction performance between ordinary concrete and RPC is analyzed. It provides a reference for the application of long-span RPC simple-supported box girder in practical engineering in the future. (3) based on the existing 32-meter carrier equipment, the paper puts forward the modification scheme of 48-meter RPC simply supported box girder with the whole hole. Through the above calculation and analysis, the feasibility of 48 m RPC simply supported box girder structure with long span full hole prefabrication is verified. The design of prefabricated 48 m simply supported box girder with full hole with RPC will greatly reduce the weight of the structure, and its mechanical properties can meet the requirements of the existing codes: there is no need to redesign and develop the equipment for large tonnage transportation frame. As long as the existing equipment is simply modified and strengthened, the whole hole prefabricated 48 m RPC simply supported box girder can be built, and the existing equipment will not be idle or wasted. As a tentative study, this paper provides a reference for the application and research of RPC in the engineering field in the future.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.5;U448.213
本文编号：2466641
[Abstract]:In this paper, the advantages of reactive powder concrete (Reactive Powder Concrete,) material and box section beam are combined, and the structure conception of 48 m RPC simply supported box girder with long span whole hole precast is put forward. The main contents of this paper are as follows: (1) the deformation, stress and crack resistance of 48 m RPC simply supported box girder are calculated and analyzed. The theoretical calculation of the ultimate bearing capacity is carried out, and the curves of the deflection of the middle span with the load grade, the upper edge stress and the lower edge stress of the span middle section with the load grade are analyzed by finite element software. The natural vibration frequency and mode shape of 48m RPC simple-supported box girder are solved and compared with 32-meter ordinary concrete box girder. (2) the prefabrication process of 48 m RPC simply supported box girder is analyzed, including the material and mix ratio of RPC, mixing, transportation, pouring, vibrating technology and maintenance system, and the interaction performance between ordinary concrete and RPC is analyzed. It provides a reference for the application of long-span RPC simple-supported box girder in practical engineering in the future. (3) based on the existing 32-meter carrier equipment, the paper puts forward the modification scheme of 48-meter RPC simply supported box girder with the whole hole. Through the above calculation and analysis, the feasibility of 48 m RPC simply supported box girder structure with long span full hole prefabrication is verified. The design of prefabricated 48 m simply supported box girder with full hole with RPC will greatly reduce the weight of the structure, and its mechanical properties can meet the requirements of the existing codes: there is no need to redesign and develop the equipment for large tonnage transportation frame. As long as the existing equipment is simply modified and strengthened, the whole hole prefabricated 48 m RPC simply supported box girder can be built, and the existing equipment will not be idle or wasted. As a tentative study, this paper provides a reference for the application and research of RPC in the engineering field in the future.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.5;U448.213
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