RC空间框架结构竖向倒塌分析模型及验证  

Vertical collapse modeling and verification of spatial RC frame structures

作　　者：潘亮[1,2] 刘伯权 雷拓[1] 吴涛[1] PAN Liang;LIU Bo-quan;LEI Tuo;WU Tao(School of Civil Engineering, Chang＇an University, Xi＇an 710061, Shaanxi, China;Infrastructure Department, Northwest A ＆ F University, Yangling 712100, Shaanxi, China)

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]西北农林科技大学基建规划处,陕西杨凌712100

出　　处：《长安大学学报（自然科学版）》2018年第3期64-70,79,共8页Journal of Chang’an University(Natural Science Edition)

基　　金：国家自然科学基金项目(51578077;51778060);陕西省自然科学基础研究计划(2016JM5037)

摘　　要：为研究钢筋混凝土(RC)空间有板框架结构竖向倒塌机制,探索该类结构竖向倒塌的数值模拟方法,在已完成的一个1∶3缩尺RC空间有板框架结构试件拟静力加载试验的基础上,建立该框架的有限元精细化模型,采用ABAQUS有限元软件完成了结构竖向倒塌全过程模拟。混凝土的本构关系采用ABAQUS提供的损伤塑性模型,钢筋材料采用弹塑性模型并引入延性损伤断裂准则,考虑钢材的损伤演化规律;材料参数根据材性试验数据确定,考虑单元之间的约束条件;按照试验加载方式进行模拟,通过能量时间历程保证求解结果的稳定性;采用显式算法进行求解,通过定义合理时间步长、定义光滑幅值曲线加载、采用瑞雷阻尼降低计算结果振荡、采用质量放大命令来加速计算等措施达到模拟计算静力问题的目标;并将模拟结果与试验结果进行对比。结果表明:ABAQUS混凝土损伤塑性模型和钢筋延性损伤断裂准则的引入能够较好地模拟结构竖向倒塌试验全过程;在措施合理的前提下,显式求解算法用于求解静力问题具有较高的计算效率和精度;模拟结果与试验结果的框架荷载-位移曲线、破坏特征、钢筋应力等吻合良好。建立的倒塌分析模型可为研究RC框架结构竖向倒塌破坏机理和倒塌模拟提供参考。For the research of the vertical collapse mechanism of the reinforced concrete （RC） space frame structure, a numerical simulation method for the vertical collapse of such structures was explored. Based on the completed pseudo-static loading test of a 1 ： 3 scale RC space frame structure specimen, the finite element refinement model of the framework was established, and the vertical collapse process simulation of the structure was completed using the ABAQUS finite element software. The constitutive relation of concrete adopts the damage plasticity model by ABAQUS. The elastoplastic model was used for the steel material, and the ductile damage fracture criterion was introduced. Moreover, the damage evolution rule of the steel was taken into consideration. The material parameters were determined according to the wood property test data, and the constraints between the units were considered. The simulation was performed according to the test loading method. The energy history was used to guarantee the stability of the solution, and an explicit algorithm was used to solve the problem. By defining a reasonable time step, defining the smooth amplitude curve loading, using Rayleigh damping to reduce the calculation result oscillation, and using quality commands to amplify commands for the acceleration of calculations, among other measures, the goal of the simulation of static problem was achieved, and the simulation results were compared with the test results. The results show that the damage plasticity model of the ABAQUS concrete and the damage criterion of the steel ductile damage can better simulate the entire process of the vertical collapse test. The simulation results and the test results agree well with the frame load-displacement curve, failure characteristics, and steel stress. The collapse analysis model established in this paper can provide a reference for the study of the vertical collapse failure mechanism and collapse simulation of RC frame structures. 2 tabs, 14 figs, 24 refs.

关 键 词：结构工程 RC框架结构 损伤塑性模型 延性损伤断裂 显式算法 倒塌模拟 

分 类 号：TU311.3[建筑科学—结构工程]