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Evaluation of mechanical performance and optimization design for lattice girders

机译：桁架梁的机械性能评估和优化设计

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摘要

The present study investigated the mechanical performance of the LG and its cost-efficiency. The analyses were performed using loading capacity test and numerical approach. Influential factors such as main steel bar, diagonal bar, welding and stirrup were considered. First, different cases were designed to investigate the contribution of each component. An experimental system which could simulate the resistance of rock mass was developed. Then, a performance index was introduced to evaluate the relationship between the ultimate loading capacity and cost of construction material. A simple design procedure for engineers to optimize the LG was also provided. After that, a series of plain lattice girders, shotcreted lattice girders were studied and optimized. Meanwhile, refined numerical models were developed in ABAQUS to further validate the results. Finally, the structural performance of lattice arch girders was studied. The results revealed that under the large eccentric mechanical model, the main steel bar on the rock mass side, the diagonal bar, welding length and the stirrup have limited contribution to the ultimate loading capacity of the lattice girders. Thus, the researchers proposed the optimization strategies for the lattice girders: decrease in the diameter of the main steel bar on rock mass side and the diagonal bar, reduction of the welding length, and cancellation the stirrup.
机译：本研究调查了LG的机械性能及其成本效益。使用负载能力测试和数值方法进行分析。考虑了诸如主钢筋，对角钢筋，焊接和箍筋等影响因素。首先，设计了不同的案例来调查每个组成部分的贡献。开发了可以模拟岩体阻力的实验系统。然后，引入性能指标来评估建筑材料的极限承载能力与成本之间的关系。还提供了一个用于工程师优化LG的简单设计程序。之后，研究并优化了一系列的平面桁架梁，喷射混凝土桁架梁。同时，在ABAQUS中开发了精确的数值模型以进一步验证结果。最后，研究了格构拱梁的结构性能。结果表明，在较大的偏心力学模型下，岩体侧的主钢筋，对角钢筋，焊接长度和箍筋对桁架梁的极限承载力的贡献有限。因此，研究人员提出了桁架梁的优化策略：减小岩体侧和对角线上主钢筋的直径，减小焊接长度，并取消箍筋。

著录项

  • 来源
    《Tunnelling and underground space technology》 |2019年第5期|100-111|共12页
  • 作者

    Qiu Wenge; Lu Feng; Wang Gang; Huang Guang; Zhang Huijian; Zhang Ziyun; Gong Cheng;

  • 作者单位

    Southwest Jiaotong Univ, Minist Educ, Sch Civil Engn, Key Lab Transportat Tunnel Engn, Chengdu 610031, Sichuan, Peoples R China;

    Southwest Jiaotong Univ, Minist Educ, Sch Civil Engn, Key Lab Transportat Tunnel Engn, Chengdu 610031, Sichuan, Peoples R China;

    Southwest Jiaotong Univ, Minist Educ, Sch Civil Engn, Key Lab Transportat Tunnel Engn, Chengdu 610031, Sichuan, Peoples R China;

    Southwest Jiaotong Univ, Minist Educ, Sch Civil Engn, Key Lab Transportat Tunnel Engn, Chengdu 610031, Sichuan, Peoples R China;

    Southwest Jiaotong Univ, Minist Educ, Sch Civil Engn, Key Lab Transportat Tunnel Engn, Chengdu 610031, Sichuan, Peoples R China;

    Southwest Jiaotong Univ, Minist Educ, Sch Civil Engn, Key Lab Transportat Tunnel Engn, Chengdu 610031, Sichuan, Peoples R China;

    Southwest Jiaotong Univ, Minist Educ, Sch Civil Engn, Key Lab Transportat Tunnel Engn, Chengdu 610031, Sichuan, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Lattice girders; Optimization design; Performance index; Experiment; Numerical simulation;

    机译：格构梁;优化设计;性能指标;实验;数值模拟;

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