考虑屈曲前变形的钢管混凝土抛物线拱平面内稳定研究

项目名称： 考虑屈曲前变形的钢管混凝土抛物线拱平面内稳定研究

项目编号： No.51208148

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 建筑环境与结构工程学科

项目作者： 刘昌永

作者单位： 哈尔滨工业大学

项目金额： 25万元

中文摘要： 钢管混凝土拱因具有自重轻、抗压强度高、施工便捷等优点，在桥梁工程、地铁隧道开挖支护、渡槽结构以及大跨度体育场馆中得到广泛应用。随着钢管混凝土拱跨度的不断增大，其平面内稳定问题日益突出，往往成为控制设计的关键因素。现行规程或行业标准均推荐采用等效梁柱法进行钢管混凝土拱的平面内稳定设计，但该方法基于经典弹性稳定理论，未考虑屈曲前变形对稳定承载力的影响，因此不适用于屈曲前变形显著的钢管混凝土浅拱。此外，等效梁柱法忽略了弯矩沿拱身不均匀分布对稳定承载力的影响，导致计算结果与拱的实际承载力存在较大出入。本项目以工程中较常采用的抛物线拱作为研究对象，采用理论与实验相结合的方法，研究屈曲前变形对钢管混凝土拱平面内稳定承载力的影响；在此基础上，建立考虑弯矩不均匀分布的压弯相关设计公式以用于钢管混凝土抛物线拱的平面内稳定设计。本项目旨在进一步完善钢管混凝土拱平面内稳定的设计理论与设计方法。

中文关键词： 钢管混凝土；抛物线拱；平面内稳定；矢跨比；试验

英文摘要： Concrete-filled steel tubular (CFST) arches are gaining increasing usage in bridge engineering, supporting structures of subway tunnels, arch flumes and long-span sport stadiums owing to light weight, high carrying capacity and convenient construction procedure. With the enhancement of the span ability of CFST arches, in-plane stability has become more and more important during practice design, and in some cases turns to be a key issue. In current design codes or standards, the CFST arches are taken as axial compressive or eccentric compressive columns with equivalent length. This method is derived from the classical buckling theory which ignores the effect of pre-buckling deformation on the in-plane strength. Thus, the equivalent beam-column method is not suitable for shallow arches in which the pre-buckling deformation has a notable effect on the buckling behavior. In addition, the equivalent beam-column method ignores the non-uniform distribution of bending moment, leading to a large gap between the prediction and test result. This project intends to investigate pre-buckling effect on the in-plane stability of parabolic CFST arches experimentally, and to develop an interaction equation accounting for non-uniform distribution of moment. This project aims to further improve the design theory and method of in-pl

英文关键词： concrete filled steel tube；parabolic arch；in-plane stability；rise-to-span ratio；test