大跨度煤场封闭罩棚设计研究

Study on the Design of a Large-span Coal Field Closure

江苏苏龙热电有限公司#2斗轮机煤场封闭改造工程采用沿纵向长度方向两边落地,跨中不设支承柱的大跨度拱形金属屋面建筑。钢结构纵向长度351m,跨度172m,高度53m,主桁架在跨中110m范围内设置预应力张弦索,通过V型撑杆与主桁架连接。从结构选型、风荷载体形系数取值、预应力张弦索设置等方面论述本结构体系的力学特征。对结构进行动静力分析、多荷载工况下的承载全过程分析以及结构抗倒塌分析,多方面论证结构的安全性能。最后得出结构各项指标均满足规范要求,并具有良好的抗倒塌性能,结构选型合理。

Jiangsu Sulong Thermal Power Co.,Ltd.# 2 Dou turbine coal yard closed reconstruction project adopts the long-span arched metal roof building with two sides falling along the longitudinal length direction and no supporting columns in the middle span.The longitudinal length of the steel structure is 351m,the span is 172m,and the height is 53m.The main truss is connected with the main truss within the span of 110m and connected with the main truss through the V-shaped brace.The mechanical characteristics of the structure system are discussed from the aspects of structural selection,the value of wind load carrier shape coefficient and the setting of prestressed string.The static analysis of structural progressive action,the analysis of the whole process of bearing under multi-load conditions and the analysis of structural collapse resistance are carried out in many aspects.Demonstrate the safety performance of the structure.Finally,it is concluded that all the indexes of the structure meet the requirements of the code,and have good anti-collapse performance,and the structure selection is reasonable.