摘要
传统部分填充钢-混凝土(partially encased composite,PEC)梁通常选用平直腹板,该类腹板的受剪承载力偏低,且平直腹板与混凝土之间无机械咬合力,不利于两者的协同工作。为解决平直腹板带来的不利影响,选用波浪腹板进行截面替换,形成新型波浪腹板PEC梁。通过低周反复荷载试验,分析波浪腹板PEC梁在地震荷载作用下的抗震延性性能,研究了翼缘厚度、剪跨比对正弦波浪腹板PEC梁的承载力、破坏形式、变形能力、滞回耗能能力和刚度退化等的影响规律。研究结果表明:合理设计波浪腹板PEC梁的承载力和抗震延性性能较好;剪跨比对梁的破坏形式及延性有显著影响,翼缘厚度增大可以有效提高梁截面承载力,但过厚的翼缘会影响型钢与混凝土的协同工作性能,在试验中翼缘厚度较小,剪跨比较大的构件型钢与混凝土匹配度高,其延性和耗能能力发挥最为充分。
Traditional partially encased composite(PEC)beams usually adopt straight web plates,however,such web plates exhibit lower shear carrying capacity and lack mechanical interlock with concrete,which hinders their collaborative performance.To address the adverse effects of straight web plates,this study proposes the utilization of corrugated web plates as a cross-sectional replacement,leading to a novel corrugated web PEC beam.Through low-cycle repeated loading tests,the seismic ductility performance of the corrugated web plate PEC beam under earthquake loads was analyzed.The influence of flange thickness and shear-span ratio on the load-bearing capacity,failure mode,deformation capacity,hysteresis energy dissipation capacity,and stiffness degradation of the sinusoidal corrugated web PEC beam were investigated.The research demonstrated that a properly designed corrugated web plate PEC beam exhibited favorable load-bearing capacity and seismic ductility performance.The shear-span ratio significantly affects the failure mode and ductility of the beam,while increase the flange thickness effectively and enhances the load-bearing capacity of section.However,excessively thick flanges can impact the collaborative performance between the steel section and concrete.In this experiment,specimens with smaller flange thickness and larger shear-span ratios demonstrated high compatibility between the steel section and concrete,resulting in full utilization of their ductility and energy dissipation capacity.
作者
陆天宇
杨克家
李杰
蒋路
楼汉忠
LU Tianyu;YANG Kejia;LI Jie;JIANG Lu;LOU Hanzhong(School of Civil Engineering and Architecture,Zhejiang Sci-Tech University,Hangzhou 310018,China;School of Civil Engineering,Taizhou University,Taizhou 318000,China;School of Engineering,Shanda University,Shanghai 201259,China;Central Research Institute of Baowu Group,Shanghai 200126,China)
出处
《地震工程与工程振动》
CSCD
北大核心
2024年第5期108-117,共10页
Earthquake Engineering and Engineering Dynamics
基金
浙江省基础公益技术研究计划项目(LGF21E080003)。
关键词
波浪腹板
部分包覆复合材料
低周反复荷载试验
承载力
滞回耗能
corrugated web
partially encased composite
low cycle repeated load test
load-bearing capacity
hysteresis energy dissipation
