钢骨截面延展性对高含钢率SRC柱静力性能的影响研究  

Effect of shape distribution of encased steel section on static performance of steel reinforced concrete columns with high steel ratio

作　　者：赵宪忠[1] 杨笑天[1,2] 陈以一[1] 

机构地区：[1]同济大学,上海200092 [2]华东建筑设计研究院有限公司,上海200002

出　　处：《土木工程学报》2016年第1期31-41,共11页China Civil Engineering Journal

基　　金：土木工程防灾国家重点实验室自由探索课题(SLDRCE15-B-01);国家自然科学基金(90815029)

摘　　要：钢骨混凝土柱的受力性能受诸多因素影响,钢骨截面延展性是其中的一个重要影响参数。本文首先定义了钢骨截面延展性系数D,以及截面模量影响因子α和约束混凝土影响因子β,用于定量描述钢骨截面延展程度;通过一组含钢率为15%的SRC柱单调压弯试验和有限元数值分析,考察了钢骨截面延展性对构件承载能力和延性性能的影响。研究表明:1高含钢率SRC柱的荷载-位移曲线变化稳定,试验现象发展平缓,承载力高,延性好;2SRC柱的承载力随截面模量因子和约束混凝土因子的增大而线性增加,承载力与截面延展性系数D有良好的线性变化关系;3试件加载后期的剩余承载力随钢骨截面延展性的提高而提高;4结合试验和数值分析结果,推导了高含钢率SRC柱的钢骨翼缘与腹板厚度比限值,并提出了若干设计建议。In the factors affecting the behavior of steel reinforced concrete（ SRC） columns,the shape distribution of encased steel section is an important one. In this study,the coefficient of shape distribution（ denoted as D） of encased steel section,the factor of section modulus α and the factor of confined concrete β are defined and employed to quantitatively evaluate the shape distribution extent of encased steel section. A series of SRC columns with steel ratio of15% and different D values were tested under monotonic axial compression and bending loads,and then finite element analysis was carried out. Based on the results,the influences of shape distribution on the bearing capacity and ductility of structural members were investigated. The results indicate that SRC columns with high steel ratio possess high bearing capacity,good ductility,steady load-displacement curves,and mild developments of experimental phenomena; the bearing capacity of SRC column linearly increases with the increase of the factor α or the increase of the factor β,while the bearing capacity has a good linear relationship with D value; the residual bearing capacity of SRC columns in the later period of loading increases with the increase of D value. Based on the experimental results and the finite element analysis results,the limit value for the thickness ratio of flange to web of the encased steel was deduced for the SRC columns with high steel ratio. Furthermore,some suggestions were given on the design of SRC columns with high steel ratio.

关 键 词：钢骨混凝土柱 高含钢率 钢骨截面延展性 单调加载 

分 类 号：TU398[建筑科学—结构工程]