基于杆段纤维模型的型钢混凝土柱滞回性能分析  

Hysteretic behavior analysis of steel reinforced concrete columns using segment fiber model

作　　者：段青玉 王强[1] 杨春晓 DUAN Qingyu;WANG Qiang;YANG Chunxiao(School of Civil Engineering,Shenyang Jianzhu University,Shenyang 110168,Liaoning,China)

机构地区：[1]沈阳建筑大学土木建筑工程学院,辽宁沈阳110168

出　　处：《地震工程学报》2025年第3期590-597,共8页China Earthquake Engineering Journal

基　　金：国家自然科学基金国家重大科研仪器研制项目(52027811);辽宁省教育厅基金项目(1nsw202005)。

摘　　要：准确预测型钢混凝土(SRC)构件的弹塑性行为对于SRC建筑结构的倒塌性能研究至关重要。文章基于离散单元法构建SRC杆段纤维模型(SRC-SFM),采用考虑材料软化的钢材单轴模型,并提出考虑型钢与箍筋约束效应的等效单一截面混凝土受压本构参数计算方法,使得规范混凝土本构模型可适用于SRC-SFM。将该模型融入课题组开发的结构倒塌离散单元计算程序DEM-COLLAPSE,并对具有不同试件参数的H型钢SRC柱在低周往复荷载下的滞回性能进行模拟分析,结果表明:SRC-SFM结合考虑软化的钢材模型和改进的混凝土本构参数计算方法,可以较好地模拟H型钢SRC压弯构件的滞回性能,为开展SRC构件断裂性能与结构倒塌过程模拟奠定了坚实的基础。Accurately predicting the elastoplastic behavior of steel reinforced concrete(SRC)members is essential for evaluating the collapse performance of SRC structures.This study develops a segment fiber model for SRC members(SRC-SFM)based on the discrete element method(DEM).Key innovations include(1)a uniaxial steel constitutive model that incorporates material softening and(2)a method for calculating concrete compressive constitutive parameters for an equivalent single-section,which accounts for dual confinement effects from structural steel and stirrups.This approach allows for the direct implementation of standard concrete models within the SRC-SFM framework.The proposed model was integrated into the DEM-based structural collapse discrete element computation program developed by the research team.Simulation analyses were performed to evaluate the hysteretic performance of H-section SRC columns with varying parameters under low-cycle reversed loading.The results confirm that the SRC-SFM,enhanced with a softening steel model and improved concrete constitutive parameter calculation method,accurately replicates the hysteretic behavior of flexural-compression members.These results establish a reliable foundation for subsequent studies on fracture mechanisms and collapse process simulations of SRC members.

关 键 词：型钢混凝土 杆段纤维模型 混凝土约束效应 单轴本构模型 滞回性能分析 

分 类 号：TU398.1[建筑科学—结构工程]