项目名称: 基于可靠度理论的超高索塔混凝土结构抗裂度设计
项目编号: No.51508091
项目类型: 青年科学基金项目
立项/批准年度: 2016
项目学科: 建筑环境与结构工程学科
项目作者: 武胜萍
作者单位: 东南大学
项目金额: 20万元
中文摘要: 超高索塔塔身、横梁和上塔柱索塔锚固区均属于易开裂的结构部位,开裂后的修补工作难度大。同时,随着索塔高度的增加,混凝土结构面临的环境温度、相对湿度、风速和外部荷载等变化复杂,结构混凝土的性能评估以及混凝土结构的抗开裂度评价难度增加。所以,本项目拟以“结构设计-材料设计”为主线,研究温度-湿度-约束多场耦合作用下高性能混凝土的形变数值计算模型,基于可靠度理论,建立高性能混凝土开裂准则、开裂概率分析模型以及混凝土结构抗裂能力评价模型,提出混凝土结构抗裂评价指标。根据超高索塔混凝土结构所处的环境作用等级、荷载条件、服役寿命要求以及裂缝宽度对混凝土耐久性的影响规律,界定索塔锚固区、横梁以及大体积承台等混凝土结构的开裂概率和抗裂指标的可靠度,提出在不同约束条件下混凝土材料的开裂应力和开裂应变的设计指标。
中文关键词: 高性能混凝土;收缩;开裂;抗裂度
英文摘要: The pylon body, beam and anchorage zone of ultra high pylon structure are prone to cracking and repair work is difficult. Meanwhile, temperature , relative humidity, wind speed and load are complex as with the increasing of pylon height. It’s difficult to estimate the performance of structural concrete and cracking resistance of concrete structure. In this project, the numerical calculation model of the strain of high performance concrete under temperature–humidity-restraint multi-field coupling will be studied, based on the reliability theoy, the crack norm of high performance concrete, analysis model of crack probability and evaluation model of concrete structure cracking resistance will be established with the concept of structure design and material design. And the evaluation index of concrete structure cracking resistance will be proposed. Then, we will define the reliability of crack probability and cracking resistance index for unltra high pylon concrete structure like anchorage zone, beam, mass bearing platform, we will also proposed the crack stress and strain design value of concrete under various restrained conditions.
英文关键词: High performance concrete;Shrinkage;Crack;Cracking resistance