新型带约束拉杆异形截面钢管混凝土柱的研究

项目名称： 新型带约束拉杆异形截面钢管混凝土柱的研究

项目编号： No.50878087

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 建筑科学

项目作者： 蔡健

作者单位： 华南理工大学

项目金额： 36万元

中文摘要： 研究一种新型带约束拉杆异形截面钢管混凝土柱，该柱沿着异形截面钢管混凝土柱的纵向，每隔一定间距，在横截面上布置横向约束拉杆，以延缓截面中部钢管壁的局部屈曲，改善约束效应，提高柱的极限承载力和延性。进行了共计123个带约束拉杆异形截面钢管混凝土柱试件的轴压和偏压试验，调查了约束拉杆间距和直径、钢管壁厚度和宽厚比、截面形状和尺寸、材料强度等各种因素对异形截面钢管混凝土柱的基本力学性能的影响；研究适用于包括方形、矩形、T形、L形和十字形截面的带约束拉杆以及不带约束拉杆异形截面钢管混凝土柱内约束核心混凝土的等效单轴本构关系、钢管壁的局部屈曲强度计算方法、以及轴压和偏压承载力计算方法；建立了一套适用于包括方形、矩形、T形、L形和十字形截面的带约束拉杆以及不带约束拉杆异形截面钢管混凝土柱的完整、系统的设计方法。该新型带约束拉杆异形截面钢管混凝土柱具有力学性能好、施工简单、造价低、且容易满足建筑使用功能要求等优点。预期成果可为工程实践提供理论依据和实用方法，对开拓钢-混凝土组合结构在高层建筑领域的应用有重要的学术意义，对完善钢管混凝土结构设计方法有重要价值。

中文关键词： 约束拉杆；异形截面；钢管混凝土柱；力学性能；设计方法

英文摘要： A study on a new type of concrete filled steel tular stub columns of specially shaped section with binding bars is carried out. A novel stiffening scheme is presented for the columns which involves level orthotropic binding bars arranged at spacings along the longitudinal axis of the steel tube. The significant improvement of the strength and ductility of the columns could be expected because of confining effects by the binding bars against the buckling mode of the plate panels of the steel tube and improving the behavior of the concrete filled in the steel tube. The mechanical behavior of the concrete filled steel tular stub columns of specially shaped section with binding bars is investigated by a experimental program which is 123 specimens subjected to axial compression and eccentric compression load including the parameters, such as the spacing and the diameter, the thickness and the ratio of depth to thickness, the shape and size of the section, the strength of the material. Further studies on the square section, rectangular section, T section, L section and + section concrete filled steel tular stub columns with binding bars or without binding bars include the constitutive relationship model for concrete filled in steel tular stub, the calculating method of buckling strength of the plate panels of the steel tube, the calculating method of the ultimate strength of the columns subjected to the axial load and the eccentric load, and the design method of the columns. The advantages of the columns are the good mechanical behavior, simply constructing and good economics. The results of the study have the technicality significance for steel concrete composite structure using in tall building structure and can provide the theory base and the practicable method for engineering.

英文关键词： binding bars; specially shaped section;concrete filled steel tular columns; mechanical behavior; design method