【摘要】：弦支穹頂結(jié)構(gòu)是由上部網(wǎng)殼和下部張拉索桿體系組合而成,是一種具有自平衡性的新型雜交預(yù)應(yīng)力空間結(jié)構(gòu)體系。其整體穩(wěn)定性能較好,對邊界約束要求較低,施工難度相對較小,且造型美觀、新穎,具有廣闊的應(yīng)用前景。本文在總結(jié)已有研究成果的基礎(chǔ)上,對弦支穹頂結(jié)構(gòu)的優(yōu)化設(shè)計和抗震性能進(jìn)行了研究,以期進(jìn)一步推進(jìn)該結(jié)構(gòu)體系的發(fā)展與應(yīng)用。 在簡要回顧弦支穹頂?shù)母拍钐岢�、結(jié)構(gòu)特點和工程應(yīng)用的基礎(chǔ)上,總結(jié)了該結(jié)構(gòu)的研究現(xiàn)狀及其存在問題,闡述了基于模擬植物生長算法的弦支穹頂優(yōu)化設(shè)計研究以及大跨橢圓形弦支穹頂抗震性能分析的理論與實踐意義。 首次將模擬植物生長算法的基本思想引入土木工程領(lǐng)域。對該算法的理論進(jìn)行了研究,并結(jié)合該算法的搜索全局最優(yōu)解方式和小概率事件原理,提出了新的算法改進(jìn)策略——基于概率的生長空間縮聚法,在保證精度的前提下,以期減少算法運(yùn)行時間,并提高搜索效率。 根據(jù)改進(jìn)的模擬植物生長算法的特點,給出了優(yōu)化算法流程,并采用ANSYS二次開發(fā)語言APDL及MATLAB編制了優(yōu)化設(shè)計程序,通過兩個算例進(jìn)行了驗證分析,結(jié)果表明：基于改進(jìn)的模擬植物生長算法的結(jié)構(gòu)用鋼量優(yōu)化設(shè)計的效果顯著,相比遺傳算法、二級優(yōu)化法、相對差商法和連續(xù)變量法等,該算法的優(yōu)化效果具有較為明顯的優(yōu)勢。 對弦支穹頂及類似的雜交預(yù)應(yīng)力空間結(jié)構(gòu)體系的優(yōu)化設(shè)計特點和難點進(jìn)行了剖析,并自行編制了優(yōu)化設(shè)計程序,進(jìn)行基于改進(jìn)的模擬植物生長算法的弦支穹頂用鋼量優(yōu)化設(shè)計,優(yōu)化結(jié)果進(jìn)一步驗證了該算法的可行性和有效性。 對大跨橢圓形弦支穹頂結(jié)構(gòu)的抗震性能進(jìn)行了較為系統(tǒng)的研究。一方面,對弦支穹頂進(jìn)行模態(tài)分析和地震作用下的時程分析,研究了自振頻率和振型的規(guī)律,分析并對比了弦支穹頂與相應(yīng)的單層網(wǎng)殼在地震作用及外部荷載下的結(jié)構(gòu)變形和構(gòu)件內(nèi)力等特性；另一方面,通過參數(shù)影響分析(如：矢跨比、平面形狀系數(shù)、上部剛性層結(jié)構(gòu)的剛度、環(huán)向索預(yù)應(yīng)力值、撐桿長度、拉索及撐桿面積等),較全面地考察了大跨橢圓形弦支穹頂結(jié)構(gòu)的抗震性能,獲得了相關(guān)規(guī)律性的結(jié)論,為類似結(jié)構(gòu)體系的設(shè)計提供了參考依據(jù)。
[Abstract]:The structure of the chord dome is composed of the upper reticulated shell and the lower tension cable rod system. It is a new type of hybrid prestressed space structure system with self balance. Its overall stability performance is better, the requirements for the boundary constraints are low, the construction difficulty is relatively small, and the modeling is beautiful, novel, and has a broad application prospect. This paper has been summed up in this paper. On the basis of the research results, the optimization design and seismic performance of the suspended dome structure are studied in order to further promote the development and application of the structure system.
On the basis of a brief review of the concept, structural features and engineering applications of the chord dome, the research status and existing problems of the structure are summarized, and the theoretical and practical significance of the study on the optimization design of the chord dome based on the simulated plant growth algorithm and the seismic analysis of the large span oval stringed dome is expounded.
The basic idea of simulated plant growth algorithm is introduced to the field of civil engineering for the first time. The theory of this algorithm is studied, and a new algorithm improvement strategy, based on the probability based spatial condensation method, is proposed by combining the global optimal solution of the algorithm and the principle of small probability events. The algorithm runs time and improves the search efficiency.
According to the characteristics of the improved simulation plant growth algorithm, the optimization algorithm flow is given, and the optimized design program is compiled with the ANSYS two development language APDL and MATLAB. The results are verified by two examples. The results show that the improved simulation plant growth algorithm has a significant effect on the steel quantity optimization design. Pass algorithm, two level optimization method, relative difference quotient method and continuous variable method and so on, the optimization effect of the algorithm has obvious advantages.
The optimization design characteristics and difficulties of the chord dome and the similar hybrid prestressed spatial structure system are analyzed, and the optimization design program is compiled by ourselves. The optimization design of the steel quantity for the string dome based on the improved simulation plant growth algorithm is carried out. The optimization results verify the feasibility and effectiveness of the algorithm.
The seismic performance of the large span oval stringed dome structure is systematically studied. On the one hand, the modal analysis and time history analysis of the chord dome are carried out. The laws of the frequency and mode of the vibration are studied, and the structural changes of the chord dome and the corresponding single layer reticulated shell under the earthquake action and external load are analyzed and compared. On the other hand, the aseismic performance of the large span oval stringed dome structure is thoroughly investigated by the parameter influence analysis (such as the vector span ratio, the plane shape coefficient, the stiffness of the upper rigid layer structure, the prestress of the ring cable, the length of the bracing rod, the area of the pull cable and the pole area, etc.). It provides a reference for the design of similar structural system.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU399;TU352.11

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