渐增幅往复荷载下钢筋桁架楼承板力学与声发射特性研究

Mechanical and acoustic emission characteristics of steel-bars truss deck under the impact of increasing amplitude cyclic loading

摘要

为探究钢筋桁架楼承板在疲劳荷载作用下的力学特性与损伤特征，设计了2块相同的钢筋桁架楼承板试件、1种静力加载工况与1种渐增幅往复加载流程。结合声发射技术进行了单向板四点弯曲加载试验，分析了往复加载对试件力学性能的影响与相关声发射参数特征。结果表明:相比静力加载，往复加载下的试件弹性工作性能基本不受影响，极限承载力下降约11%但无明显脆性破坏特征，反映了楼承板的可靠性；桁架钢筋应变在加载过程中出现协同变化现象，随着加载进行，声发射振铃计数在不同时期呈现出3阶段损伤特征；R_A-A_F值分布表明试件内部拉伸裂缝与剪切裂缝并存，拉伸裂缝占主要比例，而楼承板能在破坏阶段有效抑制混凝土的开裂。

Abstract

To explore the mechanical characteristics and damage characteristics of steel-bars truss deck under fatigue load，two same steel bar truss deck specimens，one static loading condition，and one increasing amplitude cycle loading process were designed. By using acoustic emission technology，the four-point bend loading tests on one way slab were conducted，and the influence of cycle loading on the mechanical performance and acoustic emission parameters were analyzed. The results show that compared with static loading，the elastic working performance of the specimen under cycle loading is almost unaffected，and the ultimate bearing capacity is reduced by about 11%，with no obvious brittle failure feature，reflecting the reliability of the steel bar truss deck. In addition，the strain of truss rebar shows cooperative deformation. During the loading process，the AE ringing count of specimen presents three-stage damage features in different periods；the distribution of R_A-A_F value shows that the tensile cracks and shear cracks coexist in the specimens；the tensile cracks account for the main proportion，and steel bar truss deck can effectively inhibit the cracking of concrete in failure stage.

关键词

钢筋桁架楼承板 / 渐增幅 / 疲劳 / 声发射 / 损伤表征

Key words

steel-bar truss deck / increasing amplitude / fatigue / acoustic emission / damage characterization

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基金资助

国家重点研发计划资助项目(SQ2021YFB2600031)

国家自然科学基金资助项目(52379124)