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本设计课题为中学体育场馆结构设计。该场馆供学校教学使用，建筑面积约4592m2，共两层。第一层层高为4.2m，第二层层高为8.7m。整个场馆纵向约50.7m，横向为47.24m。本工程结构地上两层，无地下层。屋顶为单向起坡，坡度7.8%，建筑物高度为19.5m。整个场馆符合使用及受力要求；简约大气，体现出现代化风格。
本设计的屋架结构形式采用弧形钢网架结构，下部采用现浇钢筋混凝土框架结构，钢屋架与主体结构之间铰接。钢结构屋架的特点是质量轻，强度高，可以满足大跨度的需求，安装方便使得施工工期短，可以降低投资成本，而且防火性高，防腐蚀性强，回收无污染，环保性好。本结构采用下弦周边承重方案。自然条件如下：基本风压：0.55kN/m2（重现期为50 年）；基本雪压：0.25kN/m2（重现期为50 年）；本地区地震基本烈度为七度；地震分组为第I组；设计地震加速度为0.10g；场地类别为Ⅳ类；防火等级为二级。地质条件及地理情况见地质勘查报告。42073
主要结构材料如下：网架用钢管选用GB700中的Q235B钢，采用高频焊管或无缝钢管；高强螺栓和销子选用GB3077中的40Cr；螺栓球选用GB699中的45号钢；封板锥头选用Q235钢，钢管直径大于等于75时须采用锥头，连接焊缝以及锥头的任何截面应与连接的钢管等强，厚度应保证强度和变形的要求，并有试验报告；套筒选用Q235钢，截面与相应杆件截面等同；焊条Q235钢与Q235钢之间选用E43，Q235钢与45号钢之间选用E50。
总体上，本工程的结构设计满足了中学体育场馆的各种使用要求。
毕业论文关键词： 钢屋架；SFCAD建模；MST电算；支座计算
Abstract
The design project is the structure design of Wenhui Middle School gymnasium. The gym is used for school teaching. It is about 4592 square metres. It has two floors. The height of the first floor is 4.2m while the second floor is 8.7m.The longitudinal length of the whole gym is about 50.7 m and the transverse length is 47.24 m. There are two floors above ground and no under stratum. The design of its roof is slope structure whose slope is 4.46%, and the height of the whole building is 19.5 m. The whole gym is in accordance with the requirements of the use and force, the atmosphere is simple, and the appearance of the modern style.
The form of the roof truss structure is adopted in the design of the curved steel truss structure, the lower part of the cast-in-situ reinforced concrete frame structure. Between the steel roof and the main structure is hinged.Steel truss structure is characterized with light weight, high strength, can meet the needs of large span, convenient installation makes the construction period is short, can reduce the investment cost, and high fire resistance, corrosion and strong, no pollution, environmental protection. The structure of the bottom surrounding bearing scheme. Natural conditions are as follows: basic wind pressure: 0.55kN/m2 (return period is 50 years); basic snow pressure: 0.25kN/m2 (return period is 50 years); local basic earthquake intensity is 7 degrees, seismic grouping is the group I; design of earthquake acceleration is 0.15g; site classification as type IV; fire rating for the secondary. Geological conditions and geological conditions of the geological survey report.
The main structural material are as follows: steel frame with steel selection GB700 Q235B steel, using high frequency welded pipe or seamless steel tube; high strength bolts and pins the selection GB3077 40Cr; bolt ball used in GB699 45 steel; plate sealing conic head selection of Q235 steel, pipe diameter greater than equal to 75 shall be used for the cone, connection and weld bevel head of any cross section should be connected to the strong, the thickness should be to ensure the requirements of strength and deformation, and test report; sleeve using Q235 steel, equal cross section and the corresponding bar section; between the electrode of Q235 steel and Q235 steel used E43, Q235 steel and 45 steel selection E50.