【作者】 窦开亮；

【导师】 陈志华；

【作者基本信息】 天津大学 ， 结构工程， 2004， 硕士

【摘要】 弦支穹顶结构作为一种新型的空间复合结构体系，同单层网壳相比，具有更高的刚度和稳定性。它将单层球面网壳与张拉整体组合在一起，充分发挥各自的优点，起到“扬长避短”的作用，可以更合理、更经济的应用于大跨度空间结构当中。本文简要地介绍了弦支穹顶结构的研究现状，并提出了几种常见网格类型弦支穹顶的结构形式，重点以通用有限元分析软件，对凯威特弦支穹顶结构的稳定性能进行了较为深入的分析；另外，对天津博物馆贵宾厅进行了网壳设计，并对其现场实物静力加载试验进行了分析处理。本文对凯威特弦支穹顶结构进行了非线性稳定分析，并重点考察了拉索预应力、竖向撑杆长度、结构矢跨比及拉索布置等因素对凯威特弦支穹顶结构稳定性能的影响，并与相应的单层网壳进行了分析对比。分析研究表明，各项参数对凯威特弦支穹顶结构的稳定性能都有不同程度的影响。结构的稳定承载能力随拉索预应力的增加有较大幅度的提高；结构竖向撑杆长度增大也能大幅的提高结构的稳定承载力；虽然矢跨比越大，凯威特弦支穹顶的稳定承载力越大，但与同矢跨比的单层网壳相比，矢跨比越小凯威特弦支穹顶的稳定性的改善越明显；下部张拉整体体系中，对凯威特弦支穹顶的稳定性起控制作用的是外圈的环索，对本文分析的模型，布置最外部一到两圈拉索，结构的稳定承载力与完全布置拉索的弦支穹顶结构相比并无太大差异。由于本文采用了与文献[6]中不同的拉索预应力设定，在各项因素的分析中并未出现拉索松弛的现象。对天津博物馆贵宾厅网壳进行了结构设计，并结合其实际工程，完成了柔性索及刚性杆两类弦支穹顶结构的现场实物静载试验，采集了在分级加载的状况下实际弦支穹顶结构的杆件内力、节点变形的数据，并将试验数据与理论分析作了分析对比。试验结果与理论分析基本吻合；而由于现场实物试验的局限性以及预应力索张拉操作中存在的一定难度，使得第一次试验及一些相关数据与理论值有较大的差距。更加有效的实验方法有待进一步提出与实践。更多还原

【Abstract】 Suspendome is a new kind of hybrid space structural system, which effectivelyimproves the global stiffness and the stability of single-layer dome. It’s made up ofsingle-layer dome and tensegrity system. Due to its taking full advantages of twosystems and keeping from their own shortcomings, suspendome can be used in largespan space structure more reasonable and effective in the future. This paper simply introduces present research conditions of suspendome. it alsoposes several usual forms of suspendome system and lays the emphasis on the stableanalysis of Kiewitt suspendome and carries out detailed studies of the structure by theuse of FEM software. Besides these, structural design and the static field testsresearches of the suspendome is included, which is carried out at the honored guestroom of Tianjin museum this spring. Nonlinear stable analysis of Kiewitt suspendome is carried out in this paper.Structural parameters of suspendome, such as prestresses of cables, heights of struts,rise-span ratio, the number of cable rings, which influence the structural stableload-carrying capacity, have been analyzed in this paper by employing acomputational model of the Kiewitt suspendome. The result of the single-layer domewhich is used to compare with the Kiewitt suspendome is also included. The research shows that, these parameters deal differential influence on thestability of the Kiewitt suspendome. The stable load-carrying capacity of the Kiewittsuspendome extends when prestresses of cables goes up, increases remarkably whenheights of struts magnify. Although the stable load-carrying capacity of the Kiewittsuspendome will be higher when rise-span ratio increases, the enhancement of thestructural stable load-carrying capacity is more remarkable under the lower rise-spanratio circumstance. The outside cable rings place more influence on the structuralstable load-carrying capacity. Considering on the model used in this paper, structuralstable load-carrying capacity changes little in the comparison between only outsidecable rings included and all cable rings included. As the prestresses method of cablesused in this paper is different from the method used in document[6], flabby of thecables doesn’t occur in this paper during the analysis process. Subsequently, structural design of the suspendome at the honored guest room ofTianjin museum is included. Static field material object tests of the suspendome iscarried out this spring, which makes us understand more clearly about the internal<WP=5>force of the elements, cables and joints displacements of the suspendome. We alsocompare the field tests data with the theoretical data in order to find agreementbetween the practice and the theory. Due to the limitation of the field tests and theoperational difficulty of the cable prestresses, the first test shows significantdifference between the practice and the theory, but the fundamental agreement hasbeen reached between the practical and the theatrical data. The more effective testmethod is anticipated during the forward research and practice.更多还原