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主要介绍天津体育中心射击馆屋盖钢结构弦支梁的设计过程,重点阐述了三号屋盖双向弦支梁的设计和分析,包括双向弦支梁的体系介绍及参数分析与选择、屋盖自振特性分析、地震作用下结构强度验算以及节点设计等。分析得到双向弦支梁设计应在参数分析的基础上进行详细对比,综合考虑撑杆布置、垂跨比、预拉力、面外拉索等影响因素;对于直线形双向弦支梁,垂跨比在一定范围内时,钢梁最大应力、最大竖向挠度及支座水平位移均随垂跨比的增大而减小;钢梁最大应力及最大竖向挠度随预拉力的增大线性减小,支座水平位移则相反;同时直线形弦支梁的撑杆下节点应具有可靠的面外约束。
Mainly introduces the design process of roof steel chord beams of the roof of Tianjin Sports Center, focusing on the design and analysis of the two-way chord beam of the third roof, including the system introduction and parameter analysis and selection of the two-way chord beam, Natural vibration analysis, structural strength checking under earthquake and node design. The results show that the design of the two-way chord girder should be compared in detail based on the parametric analysis, considering factors such as strut arrangement, vertical-span ratio, pre-tensioning and out-of-plane cable; Within a certain range, the maximum stress, the maximum vertical deflection and the horizontal displacement of the support girder decrease with the increase of the span ratio. The maximum stress and the maximum vertical deflection of the girder decrease linearly with the increase of the pre-tension , While the horizontal displacement of bearing is the opposite; meanwhile, the supporting node of linear chord beam should have reliable out-of-plane restraint.