弦支混凝土集成屋盖结构特性分析及其参数讨论
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摘要
在已有研究成果的基础上,着重分析研究了影响弦支混凝土集成屋盖结构静力学特性及其自振特性的主要因素。研究表明,适当增大结构的垂跨比和拉索截面均可有效地改善结构受力;增大板厚可在一定程度上改善结构的整体刚度,但同时也增大了结构自重;撑杆截面对结构静力学特性影响较小;对结构前30阶自振频率研究发现,垂跨比、拉索截面和撑杆截面对其影响均较小,尽管板厚度对结构基频的影响较小,但其对结构较高阶自振频率的影响较大,从第2阶模态开始,随着板厚度的增大,各阶频率基本呈递增趋势,随着各参数的变化,结构的各阶振型基本保持一致。
Based on the existing research results,the influence parameters on statics and natural vibration characteristics of the cable supported concrete roof structure were mainly investigated.The results indicate that the statics characteristics of the structure are improved by increasing sag-span ratio of the structure or the section of the cables.The rigidity of the structure is improved to a certain extent by increasing the thickness of slabs,but in the meantime,the weight of the structure is increased.The influence of the section of struts on the statics characteristics of the structure is weak.The first thirty natural frequencies of the structure are researched,and it is found that the influence of sag-span ratio,section of cables and section of struts on the structure are all weak.Although the influence of the thickness of slab on the first natural frequency is weak,this influence is noticeable for the higher natural frequencies.Starting from the second mode,each of natural frequencies increases as the thickness of slab increases,and every mode shape keep similar as every parameter involved above change.
Based on the existing research results,the influence parameters on statics and natural vibration characteristics of the cable supported concrete roof structure were mainly investigated.The results indicate that the statics characteristics of the structure are improved by increasing sag-span ratio of the structure or the section of the cables.The rigidity of the structure is improved to a certain extent by increasing the thickness of slabs,but in the meantime,the weight of the structure is increased.The influence of the section of struts on the statics characteristics of the structure is weak.The first thirty natural frequencies of the structure are researched,and it is found that the influence of sag-span ratio,section of cables and section of struts on the structure are all weak.Although the influence of the thickness of slab on the first natural frequency is weak,this influence is noticeable for the higher natural frequencies.Starting from the second mode,each of natural frequencies increases as the thickness of slab increases,and every mode shape keep similar as every parameter involved above change.
引文
[1]陈志华,乔文涛.弦支混凝土集成屋盖结构及其基本特性分析[J].建筑结构,2010,40(11):22-25.
[2]王秀丽,丁南生,崔继付.张弦梁结构的自振特性分析[J].兰州理工大学学报,2006,32(4):105-108.
[3]韩庆华,裴波,王成博,等.预应力组合网架结构的自振特性分析及现场测试[J].地震工程与工程振动,2004,24(2):118-124.
[4]王勖成.有限单元法[M].北京:清华大学出版社,2004.
[2]王秀丽,丁南生,崔继付.张弦梁结构的自振特性分析[J].兰州理工大学学报,2006,32(4):105-108.
[3]韩庆华,裴波,王成博,等.预应力组合网架结构的自振特性分析及现场测试[J].地震工程与工程振动,2004,24(2):118-124.
[4]王勖成.有限单元法[M].北京:清华大学出版社,2004.
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