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公开(公告)号：US20210199560A1
公开(公告)日：2021-07-01
申请号：US16758868
申请日：2019-07-16
发明人： Yafei MA , Xiaochao SU , Lei WANG , Jianren ZHANG , Zhongzhao GUO
摘要： The invention discloses a method and a system for predicting the corrosion fatigue life of prestressed concrete bridges. A corrosion level of the strand is predicted to obtain the residual tension force of a structure. A stress concentration factor is integrated to consider the stress concentration effect caused by pitting corrosion, and a growth model of the elastic stress of the strand under the coupled effect of corrosion and fatigue is proposed. A growth model of the plastic stress of the strand is established using a cross-section loss of the strand as a fatigue damage parameter based on a degenerated elastic modulus of the concrete after fatigue. Failure criteria for the concrete, the strand, and a longitudinal tension bar are defined, so that a set of methods for analyzing the life of a prestressed concrete bridge subjected to corrosive environment and fatigue load are formed.
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公开(公告)号：US20210062441A1
公开(公告)日：2021-03-04
申请号：US16639745
申请日：2019-04-08
发明人： Lei WANG , Yafei MA , Zhongzhao GUO , Jianren ZHANG
摘要： The invention discloses an arch foot maintaining device and a maintenance method for achieving multi-degree-of-freedom displacement of an arch foot. The device includes a plurality of supporting structures, and the supporting structure includes a base (1), two base supporting seats (7), a hydraulic jack (2), a roller (3), and a roller supporting seat (4). The base (1) is a cuboid with equal length and width, a through hole running through side surfaces of the base (1) is provided on the base (1). A vertical guide groove is provided on each of the two base supporting seats (7). The roller supporting seat (4) is U-shaped and located between the two base supporting seats (7), and the roller (3) is rotatably supported in the roller supporting seat (4). Two ends of a central axis (14) of the roller (3) are respectively located in the two guide grooves, the hydraulic jack (2) is disposed within the base (1), and a top of the hydraulic jack (2) abuts against a bottom of the roller supporting seat (4). A plurality of supporting structures are freely combined to form an arch foot maintaining device, and an arch foot is sectioned and lifting/lowering of each roller (3) is controlled to achieve translation and rotation of the arch foot. The invention is simple in structure, flexible, convenient in operation, and highly adaptable, and therefore may be widely applied in arch foot maintenance and strengthening.
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