新型落地索拱结构及其力学性能分析  

New ground-supported cable arch structure and analysis of its mechanical performance

作　　者：杨大彬[1] 张毅刚[1] 吴金志[1] 

机构地区：[1]北京工业大学城市与工程安全减灾省部共建教育部重点实验室,北京100124

出　　处：《建筑结构学报》2011年第8期51-58,共8页Journal of Building Structures

基　　金：国家级学术团队建设项目

摘　　要：提出了一种新型落地索拱结构,相比于其他类型索拱结构,该结构可以保持较高的室内净空,建筑使用功能和建筑效果较好。建立了跨度60 m,矢跨比分别为0.2、0.3和0.4的纯拱和索拱结构的力学模型,对比了不同矢跨比下纯拱和索拱模型的承载力、刚度、动力特性和稳定性等力学性能指标及用钢量。结果表明:该新型索拱结构可以有效降低拱结构的内力峰值,提高其刚度和稳定性,减小水平支座反力,结构体系合理、力学性能优越;经优化后的同等跨度新型索拱结构较纯拱结构的省钢率可达30%～40%;该索拱结构的位移控制组合均为包含半跨活荷载和风荷载的组合,非线性静力稳定的控制组合为包含半跨荷载的组合或者全跨荷载组合;其最优矢跨比约为0.2～0.3。A new type of ground-supported cable arch structure was proposed in the paper.Compared with other types of cable arch structures,the new one can obtain relatively high clearance,good architectural function and effect.Mechanical arch and cable arch models with span of 60 m and rise-to-span ratios of 0.2,0.3 and 0.4 were created.The mechanical performances including initial force,strength,stiffness,dynamic characteristic and stability performance plus the material costs were compared between the arch and cable arch structures with various rise-to-span ratios.The results show that the maximum initial force can be significantly reduced and the stiffness and stability performance can be enhanced remarkably.The maximum horizontal reaction force can be reduced to some extent with the new cable arch structure.The new structural system is rational and the mechanical performance is good.The economic performance is good since the material cost can be 30% to 40% less than the arch structures.The governing load combination for displacement control is the one including half span live load and wind load,and the governing load combination for stability is the one only including whole span load or half span load.The optimal rise-to-span ratio ranges from 0.2 to 0.3.

关 键 词：预应力钢结构 索拱 有限元分析 力学性能 

分 类 号：TU393.3[建筑科学—结构工程] TU311.41