Abstract
In this study, a three-dimensional finite element model was established to simulate the dynamic response of a large-scale steel-reinforced concrete composite high-pile wharf with a rock-socketed steel sheath. The model is based on the second phase of the Chongqing Orchard Harbor structure project in conjunction with the project “Research on the mechanism of interface damage and energy dissipation of the structure of the large-scale steel-reinforced concrete composite high-pile wharf in inland waters.” The stiffness of frame wharf is studied from the perspective of modal and transient dynamic analysis of structural dynamics. The distribution of the low-order modal frequency is more uniform. With the increase of the order, the modal frequency of the structure shows a periodical jump. The overall stiffness of the frame structure is larger with the steel sheath, and the longitudinal stiffness is less than the transverse stiffness. Under the action of transverse impact load, the members and joints of the steel-concrete structure exhibit synchronous mechanical response characteristics in the time domain. The peak values of displacement and stress of the structural joints occur 0.05 s after the peak value of the load-time history, and the peak value of reverse response of force occurs at 2.3 s, which is markedly smaller than the peak value of the response of load direction. Reducing the local positional stiffness of the load point is beneficial to improve the stress of the entire structure. The weak links of the frame structure appear at the joints of the members. Because of the hoop action of the steel sheath, the stress of the reinforced concrete pile core is more uniform. The peak value of the equivalent stress of the steel sheath member is generally larger than that of the reinforced concrete pile core, and the stress is highly concentrated at the joints of the steel tube longitudinal and transverse braces.
Highlights
As a result of the normal operation plan of the ree Gorges Reservoir, which has a maximum water level of 175.00 m, the wharf upstream of the dam in the reservoir area will experience a long period of deep water, as well as a flood period in which the water level will steeply rise and fall
Some preliminary research results have been obtained on the static load mechanical properties of structures. e steel pipe made of a rib-steel plate was first used in Dazhi Bridge in Japan [1], and the ribs allowed the steel pipe and the reinforced concrete in the pipe to achieve the overall stress effect. e pipe with the rib-steel plate was appraised by the construction center of Japan in 1984
For steel pipes with single curvature and relatively large thickness, the structure may remain elastic during an earthquake [2, 3]. e bearing capacity of a rock-socketed pile with a steel shell is affected by factors such as the pile diameter, the embedded depth of the pile body, rock mass modulus, the position of the operation point, and the width of flaps. e effect of the steel tube reduces the displacement of the pile top by at least 50%, and the steel tube bears nearly 60% of the bending moment, while the tube at the maximum point of the antibending moment only bears about 28% of the bending moment [4,5,6]
Summary
As a result of the normal operation plan of the ree Gorges Reservoir, which has a maximum water level of 175.00 m, the wharf upstream of the dam in the reservoir area will experience a long period of deep water, as well as a flood period in which the water level will steeply rise and fall. Under the action of lateral load, the large-diameter rock-socketed concrete-filled steel tube pile bears most of the lateral load, so the stress concentration effect near the bottom of the steel tube should be considered in the design. Both the steel tube and backfill sand can effectively limit the displacement of the pile under the action of working load [7]. Huang et al [21] established a spatial model by the finite element method, studied the natural vibration frequency and mode distribution of an overhead vertical wharf structure, and discussed the dynamic characteristics of the wharf structure. Modal analysis and transient dynamic analysis are proposed for analyzing the steel-filled rock-socketed pile frame wharf
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