含不规则跨尺度裂缝的钢筋混凝土厂房吊车梁结构性能分析  

Structural performance analysis of reinforced concrete crane beam with irregular cross-scale cracks

作　　者：贾超[1,2] 王亦欣 闵巧玲 李明超 JIA Chao;WANG Yixin;MIN Qiaoling;LI Mingchao(State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300350,China;Yellow River Engineering Consulting Co.,Ltd.,Zhengzhou 450003,China)

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300350 [2]黄河勘测规划设计研究院有限公司,河南郑州450003

出　　处：《水资源与水工程学报》2023年第1期159-167,共9页Journal of Water Resources and Water Engineering

基　　金：国家自然科学基金项目(51879185)。

摘　　要：钢筋混凝土厂房吊车梁在水电站工程建设中被广泛应用,但高寒区的低温、高风速、低湿度的环境条件易使吊车梁在施工过程中产生不规则表面裂缝,严重影响该混凝土结构的安全服役。由于裂缝尺度远远小于钢筋混凝土吊车梁结构尺度,使得现有计算方法难以有效考虑不规则、小尺度裂缝的真实形态。为解决该问题,提出了一种基于真实裂缝点云的不规则跨尺度裂缝计算方法,在无裂缝网格模型的基础上,将穿过裂缝单元的节点批量投影至裂缝曲面上,建立含精细化真实裂缝的数值模型。该方法具有不改变初始单元类型、无需对裂缝模型进行网格划分的优点,比传统的几何剖分法具有更好的适用性。通过混凝土三点弯曲及楔入劈拉试验验证了该跨尺度裂缝计算方法的正确性,并将其应用至我国高寒区钢筋混凝土吊车梁结构的安全性能分析中,为吊车梁质量评估及后续修复加固提供了有力的技术支撑。As a necessary structure for the construction of hydropower stations,the crane beam of reinforced concrete powerhouse is widely used in the dam engineering.However,the environmental conditions of low temperature,high wind speed and low humidity in the alpine regions easily lead to irregular surface cracks in the reinforced concrete crane beam during construction,which seriously affects the safe service of the concrete structure.The scale of irregular cracks is much smaller than the structural scale of reinforced concrete crane beams,which makes it difficult for the existing calculation methods to effectively consider the irregularity and morphological authenticity of the cracks.To solve this problem,a highly detailed simulation method for irregular cross-scale cracks based on real crack point cloud is proposed.In this method,the crack surface is represented by point clouds and embedded to the finite element meshe of the structure.The element nodes where the crack passes through are then projected to the crack surface in batches to capture the crack and its propagation path.The main advantage of the proposed method is that it does not need to change the initial element types and mesh the geometric model with cracks,which can reduce the difficulty of meshing for complex 3D models and is more applicable than conventional geometric subdivision method.Moreover,the concrete three-point bending beam and wedge-splitting experiments are conducted to verify this proposed method.Then this method is applied to the structural safety analysis of a reinforced concrete crane beam in the alpine region of China,which can provide a technical support for the subsequent quality assessment and reinforcement of crane beams.

关 键 词：厂房吊车梁 不规则裂缝 跨尺度 结构性能 精细化数值模型 安全性分析 

分 类 号：TV33[水利工程—水工结构工程]