Steel Structure Design of Nantong International Conference Center
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摘要: 南通国际会议中心位于南通市崇川区紫琅湖东北岸,建筑总面积约8万m2。建筑平面沿长向分别布置多功能厅和宴会、会议厅两个大功能分区,中间设入口,与大厅连接。建筑平面总长280 m,宽度84 m,功能区结构屋面最大高度23 m。地下1层兼具车库及人防功能,采用混凝土结构;地上1~3层层高不等,由下至上分别为9,6,4.5 m,兼具会议及展示功能。主体采用钢框架结构体系,大跨空间屋顶采用钢桁架结构,最大跨度54 m;顶部造型屋面为自由曲面,最大高度30 m,采用交叉管桁架结构。
结合建筑功能,会议中心主体结构采用钢框架+大跨钢桁架结构体系,造型屋盖采用空间网格结构,整体结构兼具多高层结构及空间结构受力特征。由于结构超长,且因功能区分存在明显的两个结构单元,仅通过入口大厅屋顶及局部的屋盖连接,存在连体薄弱、扭转效应明显、外围支承柱设计等诸多结构设计问题和设计难点。为解决上述难点,从概念设计、计算分析、构造措施等多个方面展开分析研究。通过设置屈曲约束支撑,解决整体结构抗扭能力不足,同时避免普通支撑吸收过多的地震作用而加重支撑框架的负担。针对平面超长、屋盖弱连体的不利条件,采取单体、连体进行承载力包络设计,并对弱连体位置进行局部加强。为实现外围超细柱的建筑效果,依据抗震概念设计,对外围柱约束条件及对应屋盖布置进行优化,将该柱设计为不参与水平抗侧体系的摇摆柱,柱顶及柱底释放抗弯约束,仅提供竖向支承而不参与整体抗侧,此时,支承柱不属于框架柱,长细比构造措施可大幅度降低。对桁架弦杆中箱型转工字型的转换节点,从节点传力机制、加工制作难度方面进行分析,最终采用构造简单,传力可靠的新型节点形式,降低了加工制作及现场施工难度。并结合建筑功能特性,局部采用最新研发的高强耐火耐蚀钢材,起到了很好的示范作用。Abstract: Nantong International Convention and Exhibition Center is located in Chongchuan District of Nantong City, on the northeast shore of Purple Lang Lake, with a total building area of about 80 000 square meters. Along the long direction of the building plan, the multi-function hall and the banquet hall and the conference hall were respectively arranged into two major functional divisions, which were connected by the entrance hall in the middle. The total length of the building is 280 meters, the width is 84 meters, and the maximum height of the functional structure roof is 23 meters. 1 underground floor used concrete structure for the garage and civil air defense function. The floors above the ground are 1 to 3, and the height is 9 meters, 6 meters and 4.5 meters respectively from bottom to top. The main body adopted the steel frame structure system, and the long-span space roof adopted the steel truss structure, with the maximum span of 54 meters. The top molding roof was free-form surface with a maximum height of about 30 meters and adopted cross pipe truss structure.
Combined with the architectural function, the main structure of the conference center adopted steel frame and long-span steel truss structure system, spatial grid structure was used to form the skeleton of the roof. The overall structure has the characteristics of multi-high-rise structure and spatial structure. Due to the super length of the structure and two structural units with different functional distinction, the overall structure was connected by the entrance hall roof and local roof. The structural design has many design difficulties, such as weak linkage, obvious torsion effect, and the design of peripheral supporting columns. In order to solve the above difficulties, the analysis and research were carried out from the aspects of conceptual design, computational analysis and construction measures. Buckling restrained braces were introduced to avoid overload of the supporting frame due to absorbing too much seismic actions, while maintained sufficient torsion resistance of the entire structure. Considering the unfavourable integration of over length plane and weak connective of the roof, an envelope bearing capacity design was conducted to cover difference from structural components designed as single structures to structural components designed as one connected structure. The weak connective position was locally strengthened. In order to realize the architectural effect of ultra-thin columns along the perimeter, the constraint conditions of the perimeter columns and the corresponding roof structural arrangement were optimized based on the seismic design concept. The column was designed to not participate in system of horizontal lateral swing column. The bottom of the pillars and columns released the bending constraints and only provided vertical and not participate in the overall lateral. At this point, the supporting column did not belong to frame column and construction measures slenderness ratio could be greatly reduced. The transformation joints of box-shape to I-shape of truss chord were analyzed from the aspects of force transmission mechanism and manufacturing difficulty, and finally a new joint form with simple structure and reliable force transmission was adopted, which reduced the difficulty of processing, manufacturing and field construction. Combined with the functional characteristics of the building, the local use of the latest research and development of high strength refractory corrosion resistant steel has played a good demonstration role. -
[1] 中华人民共和国住房和城乡建设部.建筑消能减震技术规程: JGJ 297—2013[S]. 北京:中国建筑工业出版社, 2013. [2] 中华人民共和国住房和城乡建设部.建筑抗震设计规范:GB 50011—2010[S]. 北京:中国建筑工业出版社, 2016. [3] 卜龙瑰, 段世昌, 邢珏蕙, 等. 南通国际会议中心抗震设计可行性报告[R].北京:北京市建筑设计研究院有限公司, 2018.
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