仿真砼特性及其在桥梁模型试验中的应用研究

发布时间：2018-12-15 15:42

【摘要】：介绍了深水桥梁建设现状以及桥梁模型试验的必要性,并对模型试验和模型材料的研究现状进行研究对比。选择仿真混凝土材料作为本文的主要研究对象和模型桥墩振动台试验的材料。对仿真混凝土材料的弹性模量测量方法进行了分析研究,选取全标距法作为其弹性模量测试方法。研究了仿真混凝土材料的抗压强度、弹性模量和峰值应变随养护龄期的变化规律；材料的劈裂抗拉强度随养护龄期的变化规律以及不同试件尺寸对材料劈裂抗拉强度的影响；材料抗剪强度和断裂韧度随龄期的变化规律,并考虑不同缝高比对材料断裂韧度的影响。对比研究了常用的动弹性模量确定和测试方法,分析动弹性模量随材料龄期的变化规律,以及悬臂长度对其测试结果的影响,同时研究了动、静弹性模量比值关系随材料龄期的变化规律。以墩-水耦合振动台试验为基础,通过对振动台试验测试数据进行分析并辅以有限元模型计算的方式,研究了仿真混凝土在深水桥墩模型试验中的适用性。
[Abstract]:This paper introduces the present situation of deep water bridge construction and the necessity of bridge model test, and compares the research status of model test and model material. The material of simulation concrete is chosen as the main research object of this paper and the material of shaking table test of model pier. The measurement method of elastic modulus of simulated concrete material is analyzed and studied, and the full-scale distance method is chosen as the measuring method of elastic modulus. The variation of compressive strength, elastic modulus and peak strain with curing age, the variation of splitting tensile strength with curing age, and the effect of different specimen sizes on the splitting tensile strength of concrete are studied. The variation of shear strength and fracture toughness with age and the effect of different ratio of joint height on fracture toughness were considered. The determination and measurement methods of dynamic elastic modulus are compared and studied. The variation law of dynamic elastic modulus with the age of material and the influence of cantilever length on the test results are analyzed. The relation of static modulus of elasticity with the age of materials. Based on the pier-water coupled shaking table test, the applicability of simulated concrete in the model test of deep water bridge pier is studied by analyzing the test data of the shaking table test and using the finite element model calculation method.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U444;U441

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