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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 floor-standing cable arch structure is proposed. Compared with other types of cable arch structures, the structure can maintain a high indoor clearance, and the building function and building effect are better. The mechanical model of pure arch and arch structure with span of 60 m and lengthwise span ratio of 0.2, 0.3 and 0.4 respectively is established. The bearing capacity, stiffness, dynamic characteristics and stability of pure arch and arch model under different ratio of span to span are compared Sexual mechanical properties such as indicators and the amount of steel. The results show that the new cable arch structure can effectively reduce the peak value of internal force of the arch structure, increase the rigidity and stability of the arch structure, reduce the reaction force of the horizontal support, have a reasonable structural system and superior mechanical properties. The optimized new arch structure with the same span, The steel ratio of the pure arch structure can reach 30% ~ 40%; the displacement control combination of the arch structure is a combination of semi-span live load and wind load, and the nonlinear static stability control combination is a half- Combined or full cross-load combination; the optimal ratio of about 2 ~ 0.3.