自由曲面混凝土壳体结构静力试验研究  

Experimental study on static behavior of free-surface concrete shell

作　　者：崔昌禹[1,2] 崔国勇[2] 姜宝石[2] 

机构地区：[1]哈尔滨工业大学结构工程灾变与控制教育部重点实验室,黑龙江哈尔滨150090 [2]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090

出　　处：《建筑结构学报》2014年第11期77-84,共8页Journal of Building Structures

基　　金：国家自然科学基金面上项目(50978075)

摘　　要：自由曲面结构不仅要具备良好的建筑表现力也要保证其受力合理性。利用自由曲面结构形态创建的非均匀有理B样条-梯度法(NURBS-GM)得到典型的凹凸自由曲面作为研究对象,制作混凝土壳体模型结构并进行静力试验研究。结果表明:弯曲应力在正负高斯曲率过渡区与支座附近较大,但整个结构主要仍以薄膜应力的形式抵抗荷载,随着荷载的增加薄膜应力分布有所变化,特别是正负高斯曲率过渡区变化较显著。上表面裂缝在正负高斯曲率过渡区出现并向支座附近发展,下表面则基本是加载点附近裂缝的连线并延伸至支座附近。整个加载过程中,裂缝出现较晚,但数量较多,最终在加载点附近发生局部强度破坏。荷载-位移曲线在弹性阶段斜率较大,并有较长的塑性发展段。采用ABAQUS有限元分析软件对试验模型进行有限元模拟并与实测数据进行对比,二者吻合较好。The free-surface structure is expected to not only have excellent architectural expression power,but also guarantee the mechanical rationality.In this research,the static test was performed on a typical Gaussian curvature free-surface obtained through the method developed in the paper named the NURBS-GM method for computational morphogenesis of free-form structure.Results show that higher bending stress appears in the transition area of the positive-negative Gaussian curvature,as well as the neighboring region of the support.However,the structure mainly resists the load in the form of membrane stress.The distribution of the membrane stress changes along with the increasing load.And the significant change happens in the positive-negative Gaussian curvature transition area.The top surface crack appears in the positive-negative Gaussian curvature transition area first and develops towards the support.Cracks on the bottom surface are jointed to form complete lines and extended to the support.During the whole loading process,cracks appear a little later while its quantity is large.At last,local strength damage happens in the neighboring area of the loading point.The load-displacement curve has a large slope in the elastic stage and a long plastic development stage.FE simulation was performed for the test model using the software ABAQUS.Results of the FE simulation were compared with the test data.And it is found that they agree well.

关 键 词：壳体结构 形状优化 NURBS-GM法 自由曲面 静力试验 力学性能 

分 类 号：TU33[建筑科学—结构工程] TU317.1