Consecutive lifting and lowering electrohydraulic system for large size and heavy structure

“…Because of the high mechanical properties of steel, the large-span spatial structures mostly use steel as construction material and its seismic resistance is also verified by several researchers [8][9][10]. For a large-span steel truss structure (LSTS), the existing assembly methods on site mainly include high-altitude assembly (HA), sectional lifting (SL), integral lifting (IL) and cumulative slip (CS) [11][12][13][14]. The HA method with low site-condition requirements directly assembles the bulk of members or joints on site, and requires several temporary supports to ensure the stability of the incomplete structure during construction, but this methodology requires lots of high-altitude operations with superior difficulties and highlevel protective measures.…”

Section: Introductionmentioning

confidence: 99%

Construction process monitoring of a large-span steel truss roof based on response-increment comparison strategy

Tang,

Zhang,

Xia

et al. 2023

Meas. Sci. Technol.

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Large-span spatial structures, with good appearance and plasticity, are mostly used nowadays in urban landmarks. During its construction process, the loads are accumulated along with the construction conditions and the responses vary from the construction paths. Hence, a safety evaluation or monitoring for the construction process appears significant. During monitoring, the installation moment of strain gauges is always not the ideally non-loading status, the absolute or real strains in the structure components are difficult to acquire. Furthermore, the displacement monitoring for all key points reduces the construction efficiency. Herein, a response-increment real-time comparison strategy of stresses and unloading points’ displacements within numerical analysis is announced to avoid the above shortcomings. Based on a real large-span truss structure located in China, four construction schemes are proposed and researched by simulation method. With the proposed construction scheme and monitoring strategy, a stress and displacement monitoring for the large-span truss structure was conducted. Through the comparison between the monitoring and simulation data, the proposed strategy is verified feasible for the construction monitoring, the efficiency is accelerated and the safety is guaranteed.

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“…In construction equipment and construction methods, Zheng et al (2012) analyzed the process of raising a steel roof considering the displacement difference and determined the effect of the difference in the displacement at the lifting points. Mi et al (2013) developed an electrohydraulic system that could perform the consecutive motion of lifting or lowering of hydraulic strand jacks. Xu et al (2015) improved the uniformity and continuity of a large hydraulic jack-up system for continuous beam bridges.…”

Section: Introductionmentioning

confidence: 99%

Construction Effects on the Mechanical States of a Truss Structure

Hui-pin

Yin

Qiao

et al. 2022

J. Perform. Constr. Facil.

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Large-span spatial steel structures are subject to complex stress conditions during construction, especially during the unloading phase, and they are easily affected by the environment and the loading method. Therefore, it is necessary to analyze the influence of different unloading construction methods on the structural reliability during construction to improve the quality of construction safety. In this paper, ANSYS version 16.0 software is used to establish a finite-element analysis model of the truss structure of the Harbin railway station. The synchronous unloading process and asynchronous unloading process are numerically simulated, and the stress variation trend of the arch truss during the unloading stage is studied. The research results show that the effect of simultaneous unloading on the mechanical state of the structure is small. During the unloading process, stress is more likely to exceed its limit in the area where the boundary conditions change. Then axial strain monitoring was performed during the actual unloading process of the truss structure of the Harbin railway station. The results show that the effect of synchronous unloading on the structure's stress state is small, which is in good agreement with the numerical simulation results.

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Consecutive lifting and lowering electrohydraulic system for large size and heavy structure

Cited by 10 publications

References 2 publications

Integral lifting simulation of long-span spatial steel structures during construction

Integral lifting simulation of long-span spatial steel structures during construction

Construction process monitoring of a large-span steel truss roof based on response-increment comparison strategy

Construction Effects on the Mechanical States of a Truss Structure

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