无筋钢纤维混凝土管片正截面结构设计方法
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TU 473

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深圳市地铁集团有限公司科研课题(SZDT-JSZX-ZC-2020-0022)


Structure design method of the normal section about steel fiber reinforced concrete segment
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    摘要:

    为完善无筋钢纤维混凝土管片的设计方法,加速其在城市轨道交通中的应用,提出一种新的无筋钢纤维混凝土管片正截面结构设计方法。根据已有对钢纤维混凝土本构关系的研究成果,依据地铁管片的受力特点,分析了影响地铁管片正截面承载力的主要因素。依据无筋钢纤维混凝土管片极限拉应变与钢筋混凝土的极限拉应变不在一个数量级上的差异,结合现行混凝土规范,采用平面假设,把应力和应变作为无筋钢纤维混凝土管片设计的特征值;用钢纤维混凝土应变的取值范围对应不同的设计工况,将不同工况下的无筋钢纤维混凝土管片的设计验算结果归结到同一张应力应变图中。论述了采用轴力-弯矩包络图进行正截面设计验算的主要流程,并通过一个工程实例展示不同工况下无筋钢纤维混凝土轴力-弯矩包络图的相互关系。计算结果表明:在正常使用极限状态下,强度是影响承载能力的主要因素;而承载能力极限状态下,特别是偶然荷载作用下,无筋钢纤维混凝土的韧性是影响承载能力的主要因素。

    Abstract:

    In order to improve the design method of steel fiber reinforced concrete segment and accelerate its application in urban rail transit, a new design method of normal section structure of steel fiber reinforced concrete segment was proposed. According to the previous research results on the constitutive relationship of steel fiber concrete and the stress characteristics of subway segments, the main factors affecting the bearing capacity of the subway segments’ normal section were analyzed. Based on the difference in order of magnitude between the ultimate tensile strain of the steel fiber reinforced concrete segment and the ultimate tensile strain of einforced concrete, Combining with current concrete specifications and the assumption of plane deformation of the cross section, the stress and strain are taken as the characteristic values of the design of steel fiber reinforced concrete segments; The range of strain of the steel fiber reinforced concrete corresponds to different design conditions, the calculation results of steel fiber reinforced concrete segments under different working conditions are summarized into a same stress-strain diagram. The calculation flow of the axial cross section design using the axial force-bending moment envelope diagram was presented, and the relationship between the axial force-bending moment envelope diagrams of steel fiber reinforced concrete under different working conditions was shown through an engineering practice. The calculation results shown that strength is the main factor that affects the bearing capacity under serviceability limit state; and toughness of the steel fiber reinforced concrete is the main factor that affects the bearing capacity under ultimate capacity state, especially under accidental loading.

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温书亿,阳卫卫,孔娟,等. 无筋钢纤维混凝土管片正截面结构设计方法[J]. 科学技术与工程, 2024, 24(13): 5511-5515.
Wen Shuyi, Yang Weiwei, Kong Juan, et al. Structure design method of the normal section about steel fiber reinforced concrete segment[J]. Science Technology and Engineering,2024,24(13):5511-5515.

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  • 收稿日期:2023-05-10
  • 最后修改日期:2024-02-26
  • 录用日期:2023-11-14
  • 在线发布日期: 2024-05-17
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