钢纤维高强混凝土构件抗爆性能与损伤评估
发布时间：2018-10-09 11:53
【摘要】：现代社会爆炸事件频发,危害人类生命和财产安全。钢纤维高强混凝土(steel fiber reinforced high strength concrete,简称SFRHSC)作为新型抗爆防护材料,其抗爆性能的研究越来越受重视,而爆炸荷载作用下钢纤维混凝土构件的研究并不系统。本文采用理论分析和数值模拟方法对爆炸荷载下SFRHSC墙(板)构件的动态响应、损伤效应评估和抗震塌性能进行了系统研究。主要的研究工作和创新成果包括以下几方面:(1)使用增强效应系数fcR建立修正的钢管-SFRHSC材料的静态本构模型,并进行数值模拟分析验证了该增强效应系数修正本构的适用性,通过动载增强系数DIF来考虑应变率效应对于材料在爆炸荷载作用下的影响,为理论计算中材料的增强提供依据。计算J-H-C动态材料模型的参数值,为数值模拟提供适用于SFRHSC构件的材料动态本构模型和参数。(2)基于等效单自由度体系,考虑钢纤维增强效应和材料强度动载增大效应,对爆炸荷载下钢筋-SFRHSC墙的动态响应进行理论分析,计算构件动态响应的最大位移。运用能量守恒原理,采用Lagrangian方程建立大变形下钢纤维高强混凝土墙板构件的极限变形公式。与数值模拟结果对比证明钢纤维高强混凝土墙板构件的大塑性变形的极限变形计算公式能够满足极限变形计算分析。(3)基于显式有限元ANSYS/LS-DYNA程序,使用CONWEP加载方式建立爆炸荷载下四边固支SFRHSC墙的动态响应数值模型。通过分析揭示SFRHSC墙的动态响应中各参数的发展变化规律。对影响因素进行参数化分析,得到各参数的影响规律。依据折合距离对SFRHSC墙的破坏模式进行研究。建立了基于支座转角θ的构件超压-冲量损伤评估准则,基于等效单自由度理论计算方法和数值试算法分别建立SFRHSC墙的P-I曲线并进行公式拟合。数值试算法所建立的P-I损伤效应评估曲线能够准确地对不同爆炸荷载下钢纤维高强混凝土墙的损伤效应进行评估。(4)基于文献试验和数值模拟对SFRHSC板的震塌破坏形态和震塌破坏的影响因素进行分析,并以近爆试验的实测值为训练样本,分别建立了RBF和BP神经网络震塌模型,对空声区直径和背爆面裂缝最大宽度进行计算。使用该震塌神经网络模型,输入任意的影响因素值,能够输出空声区直径和最大裂缝宽度大小,实现对SFRHSC板在一次近爆中的抗震塌性能进行分析和评估。基于RBF震塌神经网络模型对钢纤维体积率和炸药量进行参数分析,研究表明钢纤维高强混凝土构件较之普通高强混凝土构件抗震塌性能有显著提高。
[Abstract]:Explosion incidents occur frequently in modern society, endangering human life and property safety. Steel fiber high strength concrete (steel fiber reinforced high strength concrete,), as a new anti-explosion protection material, has been paid more and more attention to, but the research of steel fiber reinforced concrete members under explosion load is not systematic. In this paper, the dynamic response, damage effect evaluation and seismic collapse performance of SFRHSC wall (slab) members under explosive loading are studied systematically by theoretical analysis and numerical simulation. The main research work and innovative achievements include the following aspects: (1) the static constitutive model of steel tube -SFRHSC material is established by using the enhanced effect coefficient (fcR), and the applicability of the modified constitutive model is verified by numerical simulation. The effect of strain rate effect on material under explosive load is considered by dynamic load enhancement coefficient (DIF), which provides a basis for material strengthening in theoretical calculation. The parameter values of J-H-C dynamic material model are calculated, and the material dynamic constitutive model and parameters suitable for SFRHSC component are provided for numerical simulation. (2) based on the equivalent single-degree-of-freedom system, the reinforcement effect of steel fiber and the dynamic load increase effect of material strength are considered. The dynamic response of reinforced SFRHSC wall under explosive loading is theoretically analyzed and the maximum displacement of the dynamic response of the member is calculated. Based on the principle of conservation of energy and Lagrangian equation, the ultimate deformation formula of steel fiber reinforced high strength concrete (SFHSC) wall slab under large deformation is established. Compared with the numerical simulation results, it is proved that the formula for calculating the ultimate deformation of steel fiber reinforced high-strength concrete wallboard members can satisfy the limit deformation calculation and analysis. (3) based on the explicit finite element ANSYS/LS-DYNA program, A numerical model of dynamic response of four sides fixed SFRHSC wall under explosive loading is established by using CONWEP loading method. The development and variation of parameters in the dynamic response of SFRHSC wall are revealed by analysis. The influencing factors are parameterized and the influence law of each parameter is obtained. The failure mode of SFRHSC wall is studied according to the equivalent distance. The criterion of overpressure-impulse damage assessment based on pedestal angle 胃 is established. The P-I curve of SFRHSC wall is established based on the equivalent single-degree-of-freedom theory method and the numerical trial algorithm, and the formula fitting is carried out. The P-I damage evaluation curve established by numerical test algorithm can accurately evaluate the damage effect of steel fiber high strength concrete wall under different explosion loads. (4) based on the literature test and numerical simulation, the damage form of SFRHSC slab can be evaluated. The influence factors of state and collapse failure are analyzed. The RBF and BP neural network collapse models are established to calculate the diameter of the hollow area and the maximum width of the fracture on the back blasting surface with the measured value of the near explosion test as the training sample. Using the neural network model of seismic collapse, the diameter of the hollow area and the maximum crack width can be outputted by inputting any factor value, and the seismic collapse performance of the SFRHSC plate in a near explosion can be analyzed and evaluated. Based on the RBF seismic collapse neural network model, the volume ratio of steel fiber and the quantity of explosive are analyzed. The results show that the seismic collapse performance of steel fiber high strength concrete members is significantly higher than that of ordinary high strength concrete members.
【学位授予单位】：长安大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TU37;TU352.13
本文编号：2259238
[Abstract]:Explosion incidents occur frequently in modern society, endangering human life and property safety. Steel fiber high strength concrete (steel fiber reinforced high strength concrete,), as a new anti-explosion protection material, has been paid more and more attention to, but the research of steel fiber reinforced concrete members under explosion load is not systematic. In this paper, the dynamic response, damage effect evaluation and seismic collapse performance of SFRHSC wall (slab) members under explosive loading are studied systematically by theoretical analysis and numerical simulation. The main research work and innovative achievements include the following aspects: (1) the static constitutive model of steel tube -SFRHSC material is established by using the enhanced effect coefficient (fcR), and the applicability of the modified constitutive model is verified by numerical simulation. The effect of strain rate effect on material under explosive load is considered by dynamic load enhancement coefficient (DIF), which provides a basis for material strengthening in theoretical calculation. The parameter values of J-H-C dynamic material model are calculated, and the material dynamic constitutive model and parameters suitable for SFRHSC component are provided for numerical simulation. (2) based on the equivalent single-degree-of-freedom system, the reinforcement effect of steel fiber and the dynamic load increase effect of material strength are considered. The dynamic response of reinforced SFRHSC wall under explosive loading is theoretically analyzed and the maximum displacement of the dynamic response of the member is calculated. Based on the principle of conservation of energy and Lagrangian equation, the ultimate deformation formula of steel fiber reinforced high strength concrete (SFHSC) wall slab under large deformation is established. Compared with the numerical simulation results, it is proved that the formula for calculating the ultimate deformation of steel fiber reinforced high-strength concrete wallboard members can satisfy the limit deformation calculation and analysis. (3) based on the explicit finite element ANSYS/LS-DYNA program, A numerical model of dynamic response of four sides fixed SFRHSC wall under explosive loading is established by using CONWEP loading method. The development and variation of parameters in the dynamic response of SFRHSC wall are revealed by analysis. The influencing factors are parameterized and the influence law of each parameter is obtained. The failure mode of SFRHSC wall is studied according to the equivalent distance. The criterion of overpressure-impulse damage assessment based on pedestal angle 胃 is established. The P-I curve of SFRHSC wall is established based on the equivalent single-degree-of-freedom theory method and the numerical trial algorithm, and the formula fitting is carried out. The P-I damage evaluation curve established by numerical test algorithm can accurately evaluate the damage effect of steel fiber high strength concrete wall under different explosion loads. (4) based on the literature test and numerical simulation, the damage form of SFRHSC slab can be evaluated. The influence factors of state and collapse failure are analyzed. The RBF and BP neural network collapse models are established to calculate the diameter of the hollow area and the maximum width of the fracture on the back blasting surface with the measured value of the near explosion test as the training sample. Using the neural network model of seismic collapse, the diameter of the hollow area and the maximum crack width can be outputted by inputting any factor value, and the seismic collapse performance of the SFRHSC plate in a near explosion can be analyzed and evaluated. Based on the RBF seismic collapse neural network model, the volume ratio of steel fiber and the quantity of explosive are analyzed. The results show that the seismic collapse performance of steel fiber high strength concrete members is significantly higher than that of ordinary high strength concrete members.
【学位授予单位】：长安大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TU37;TU352.13
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