基于逆吊实验原理的空间结构形态数值创建方法  

Computational morphogenesis method for space structures based on principle of inverse hanging experiment

作　　者：武岳[1,2] 李清朋 沈世钊[1,2] 

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4期41-48,共8页Journal of Building Structures

基　　金：国家自然科学基金项目(51378150)

摘　　要：逆吊实验法是一种基于力学平衡原理的零弯矩结构形态创建方法,在结构形态学早期发挥了重要作用。为克服逆吊实验存在的模型相似律和测试精度等问题,提出一种将逆吊实验思想与数值模拟方法相结合的"数值逆吊法",利用非线性有限元技术来实现逆吊结构形态的数值创建。该方法采用柔性索膜单元模拟逆吊结构,通过引入可变弹性模量技术并结合二分法实现对逆吊结构形状的精确控制。利用该方法对一逆吊实验模型进行数值模拟,并与试验结果进行比较,证明数值方法的精确性。在此基础上,通过调整各种约束条件研究了实现逆吊结构形态多样化的途径。利用所提方法对实际工程进行形态创建分析,证明了该方法在实际工程应用方面可行。The inverse hanging method is a form generation method for zero bending moment space structures, which is based on the mechanical balance principle, and has played an important role at the beginning of the structural morphology research. However, with the restrictions of the law of similitude, test precision and other factors, this method has rarely been used in practical engineering directly. To solve these problems, a numerical inverse hanging method on the basis of nonlinear finite element technique is presented. This method used flexible cable and membrane element to simulate the inversed structure, and with introducing variable elastic modulus technology and combining with the basic idea of bisection method. It discussed the accuracy control of the inversed structure＇ s shape. And then, the accuracy of the numerical method was verified by observing an experiment model and comparing its shape with the numerical simulating results. On this basis, with discussing the influence of all kinds of constraints on the structural form, it solves the problem of form diversification for the inversed structures. This paper created some numerical forms for several project instances by using the method proposed in this paper to show that it is feasible in practice.

关 键 词：结构形态学 数值逆吊法 非线性有限元分析 形状控制 形态多样 

分 类 号：TU33[建筑科学—结构工程] TU311.4