东篱科研大数据发现系统（DRDS）

位置：成果数据库 > 期刊 > 期刊详情页

薄壁圆钢管再生混合柱的抗震性能试验研究

ISSN号：1000-131X
期刊名称：《土木工程学报》
时间：0
分类：TU392.1[建筑科学—结构工程] TU375.3[建筑科学—结构工程]
作者机构：[1]华南理工大学亚热带建筑科学国家重点实验室,广东广州510640
相关基金：基金项目：国家杰出青年科学基金（51025829）、国家重点基础研究发展计划（973）项目（2011CB013800）、广东省科技计划项目（20098060700094）、亚热带建筑科学国家重点实验室资助项目（2011ZB07）和中央高校基本科研、肛务费项目（2009zz0046,2012ZP0011）

关键词：薄壁圆钢管, 废弃混凝土, 柱, 抗震性能, 设计标准, 纤维梁单元, circular thin-walled steel tube , demolished concrete , column , seismic behavior , design code , fiberbeam element

中文摘要：

为研究薄壁圆钢管再生混合柱的抗震性能，完成15根试件在定常轴力和水平往复荷载作用下的拟静力试验，考察废弃混凝土取代率、钢管壁厚、轴压比等因素对试件抗震性能的影响。基于新、旧混凝土的组合强度，根据国内外钢管混凝土结构设计标准以及基于ABAQUS的纤维梁单元数值模型，对试件的水平承载力进行计算分析，同时还将试件的水平承载力和极限位移实测值与螺旋箍筋钢筋混凝土柱的OpenSEES计算值进行对比。研究表明：①废弃混凝土取代率在0～40％之间变化对试件的初始抗侧刚度、钢管局部屈曲、极限位移、负刚度段行为、刚度退化效应、等效黏滞阻尼系数、滞回曲线形状都影响有限，但再生混合柱的水平承载力总体上比全现浇柱有所降低；②在钢管壁厚仅1．78ram（径厚比168．5）的情况下，轴压比0．4的再生混合柱的极限位移角可达4％，展示了良好的变形能力；③为使薄壁圆钢管再生混合柱的计算水平承载力具有与全现浇钢管混凝土柱相近的安全性，可对前者计算结果乘以调整系数0．95；④横截面积和总用钢量相同时，薄壁圆钢管再生混合柱的水平承载力大多优于螺旋箍筋柱。研究发现。薄壁圆钢管再生混合柱应用于地震区中、低轴压比情况是可行的。

英文摘要：

Tests of fifteen thin-walled circular steel tubular columns filled with Demolished Concrete Blocks （DCBs） under constant axial load and cyclic load reversals were conducted, and influences of parameters, such as replacement ratio of demolished concrete, thickness of steel tube and axial load ratio, on the seismic behavior of the specimens were investigated. Based on the concept of combined strength of the new and old concrete, and using the domestic and foreign design provisions for concrete filled steel tubular columns and the fiber beam element model based on ABAQUS, lateral load bearing capacities of the specimens were calculated and compared with the test results. In addition, the measured lateral strengths and ultimate displacements of the specimens were compared with the numerical results generated by OpenSEES for circular concrete columns reinforced with spiral and longitudinal reinforcements. The findings indicate ：（~） the influences of the replacement ratio of demolished concrete within a range of 0 ~ 40% on the specimen initial lateral stiffness, local buckling of steel tube, ultimate displacement, post-peak behavior, stiffness degradation, equivalent viscous damping coefficient, and shape of hysteretic curve are all limited, but the lateral load bearing capacities of the specimens filled with DCBs are lower than those without DCBs in general ; （~） in the case that the thickness of steel tube is only 1： 78mm, i. e. , diameter-to-thickness ratio = 168.5, the ultimate drift ratio of a specimen filled with DCBs with an axial load ratio of 0.4 can reach 4% , showing good deformation capacity; （~） to ensure that the safety margin of the calculated lateral strength for a thin-walled circular steel tubular column filled with DCBs is similar to that without DCBs, an adjustment factor of 0.95 is suggested ; and （~） with equivalent sectional area and steel ratio, the lateral strengths ofthe thin-walled circular steel tubular columns filled with concrete columns. It is applicable to use th

同期刊论文项目