曲线形钢管混凝土(CCFST)组合构件轴压试验

描述了一系列曲线形钢管混凝土(CCFST)组合构件的轴压试验。对20个试件(其中包含18个CCFST组合构件和2个曲线形中空截面钢管柱)进行了试验,研究组合构件中管件形状(圆形和方形)、初始曲率(βr,0%～7.4%)、名义长细比(λn,9.9～18.9)、截面形式(2种主要构件、3种主要构件和4种主要构件)以及支撑形式(板条和绳状)等因素对其性能的影响。试验结果表明:CCFST组合构件试样的极限强度和刚度随着βr或λn的增加而降低。板条和绳状支撑组合构件的承载力和失效模式不同。给出利用等效长细比计算轴压下CCFST组合构件极限强度的简单方法。

Curved Concrete Filled Steel Tubular(CCFST) Built-Up Members Under Axial Compression:Experiments

A series of tests on curved concrete filled steel tubular(CCFST)built-up members subjected to axial compression is described in this paper.Twenty specimens,including 18CCFST built-up members and 2curved hollow tubular built-up columns,were tested to investigate the influence of variations in the tube shape(circular and square), initial curvature ratio(βr,from 0to 7.4%),nominal slenderness ratio(λn,from 9.9to 18.9),section pattern(two main components,three main components and four main components),as well as brace pattern(battened and laced) on the performance of such composite built-up members. The experimental results showed that the ultimate strength and stiffness of CCFST built-up specimens decreased with increasingβrorλn.Different load-bearing capacities and failure modes were obtained for the battened and laced built-up members.A simplified method using an equivalent slenderness ratio was suggested to calculate the strength of CCFST built-up members under axial compression.