地震中钢筋混凝土框架结构倒塌反应的试验研究与数值仿真  

Spatial collapse responses of reinforced concrete frame structures under earthquakes—test study and numerical simulation

作　　者：顾祥林[1] 黄庆华[1] 汪小林[1] 林峰[1] 彭斌[2] 

机构地区：[1]同济大学,上海200092 [2]上海理工大学,上海200093

出　　处：《土木工程学报》2012年第9期36-45,共10页China Civil Engineering Journal

基　　金：国家自然科学基金重大研究计划(90715004);国家自然科学基金(50578116)

摘　　要：制作一个1/4钢筋混凝土框架模型结构,进行模拟地震作用下结构倒塌的振动台试验。试验结果表明,由于现浇楼板的加强作用结构呈弱柱型的倒塌模式,倒塌过程中构件间的碰撞作用非常明显。基于离散单元方法,将结构离散为板单元和柱单元组成的板-柱体系或由梁单元、节点单元和柱单元组成的梁-柱-节点体系。在单元连接界面处构建由混凝土弹簧和钢筋弹簧组成的能反映构件空间受力性能的三维拉压弹簧组,引入任意加载路径下混凝土弹簧和钢筋弹簧单轴本构关系。采用动态松弛法求解结构的反应。借助于C++语言、MFC类库和OpenGL三维图形库,开发出钢筋混凝土框架结构空间倒塌反应数值仿真系统。用素混凝土柱的变形分析及结构模型试验结果验证数值仿真系统的适用性和准确性。A shaking table test for a 1 ： 4 scaled model structure of reinforced concrete （RC） frame was implemented to simulate the structural collapse under strong earthquakes. The test results showed that the model structure was in weak column collapse mode due to the enhancement of the cast-in-situ floor slabs, and the impact between components in the collapse process was obvious. Based on discrete element method, a new 3-D tension-compression spring group composed of concrete springs and steel bar springs was developed to reflect the spatial mechanical behavior of structural members. By discretizating a structure into beam elements, joint elements and column elements or into column elements and slab elements, constructing concrete springs and steel-bar springs on the interfaces between the elements to represent the tensile, compressive, bending actions between the elements, and defining the constitutive relationships with failure criterion for the springs, a discrete element method based numerical model was established for the collapse analysis of spatial RC frame structures. A computer code was developed, using C ＋＋ , Microsoft Foundation Class library （ MFC）, and OpenGL 3 D graphic library. Deformation analysis of plain concrete columns and collapse analysis of the test model structure show that the simulation results have good match with the finite element method solutions and data from the shaking table test.

关 键 词：钢筋混凝土框架结构 振动台试验 离散单元法 倒塌 数值仿真 

分 类 号：TU375.4[建筑科学—结构工程]