仿真混凝土动弹性模量的悬臂梁法试验研究  

Experimental Research for Testing Dynamic Young’s Modulus of Simulation Concrete

作　　者：商越 张昱[1] 冯新[1] 任显祺 张浩杰 SHANG Yue;ZHANG Yu;FENG Xin;REN Xianqi;ZHANG Haojie(State Key Lab of Coastal and Offshore Engineering,Dalian University of Technology,Dalian,Liaoning 116024,China)

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024

出　　处：《水利与建筑工程学报》2022年第3期35-40,185,共7页Journal of Water Resources and Architectural Engineering

摘　　要：仿真混凝土是动力模型试验常用的材料,准确地测定其动态弹性模量对模型设计、数值分析等意义重大。在以往的研究中通常采用悬臂梁法测定仿真混凝土的动弹性模量,但该方法没有规范作为支撑,其准确性与适用性存疑。在传统的测定方法的基础上考虑了对经典梁模型的修正和基座变形导致的非完全固支效应的影响,以规范中的自由梁法测定的动弹性模量为基准值,对基于悬臂梁法测定仿真混凝土动弹模的适用性进行了研究。结果表明:试验结果与理论及数值分析的结果之间仍存在一定的差异;试验测得的1阶共振频率低于数值分析的结果,且差值随着试件长高比或长细比增大而减小;试验测得的2阶和3阶的共振频率则均高于数值分析结果。因此,通过悬臂梁法准确地测定仿真混凝土的动态弹性模量试件长高比则至少为7(长细比为24.2)。Simulation concrete is a common material in dynamic model test.Accurate determination of its dynamic Young’s modulus is of great significance to model design and numerical analysis.In previous studies,the cantilever beam method is usually used to measure the dynamic Young’s modulus of simulation concrete,but this method is not supported by any standard,and its accuracy and applicability need further discussion.Based on the traditional measurement method,the correction of the classical beam model and the influence of the incomplete fixed support effect caused by the base deformation are considered.Taking the dynamic Young’s modulus measured by the free-free beam method in the standard as the reference value,the applicability of the cantilever beam method to measure the dynamic Young’s modulus of simulation concrete is analyzed.The results show that there are still some differences between the experimental results and the results of theoretical and numerical analysis.The first-order resonance frequency measured in the test is lower than that of the numerical analysis,and the difference decreases with the increase of the lengthheight ratio or slenderness ratio.The resonance frequencies of order 2 and 3 are higher than the numerical analysis results.The results show that in order to accurately determine the dynamic Young’s modulus of simulation concrete by cantilever beam method,the length-height ratio of the specimen is at least 7(with the slenderness ratio of 24.2).

关 键 词：仿真混凝土 动态弹性模量 自由梁法 悬臂梁法 数值模拟 

分 类 号：TV41[水利工程—水工结构工程]