路县故城遗址保护展示工程——“三断”结构设计研究

“Three breaks”structural design research of Luxian ancient city site protection and exhibition project

根据建筑造型及遗址保护的需求,路县故城遗址保护展示工程形成“三断”式结构:因遗址需原址保护,该区域无法设置基础,基础不连续;首层长扶梯及采光通风等洞口集中一侧设置,导致首层该区域梁板不连续;2层北侧通透玻璃的柱不连续,无法延伸至2层,仅南侧单侧设柱,梁最大悬挑长度约17m。选取合理的抗震性能目标和抗震措施,并采用多种有限元软件对单侧长悬挑梁柱的计算结果进行了分析对比;研究了满足文保要求同时消除地基液化影响的基础方案;为满足大跨度覆土屋面的要求,结合建筑造型以及空间需求,分析了采用桁架、结构找坡等方式的可行性及经济性;以峰值加速度作为控制指标,研究人行大跨、长悬挑区域的舒适度。结果表明,采取以上措施可满足结构承载力及正常使用的要求。

According to the requirements for architectural modeling and site protection,Luxian ancient city site protection and exhibition project has formed a“three breaks”structure:the site area needs in situ protection,resulting in the foundation can not be set,and the foundation is discontinuous;the long escalator on the first floor and the openings such as lighting and ventilation are arranged on the centralized side,resulting in the area where the beams and slabs on the first floor is discontinuous;the columns with transparent glass on the north side of the second floor are discontinuous and cannot extend to the second floor,and the columns are set on one side of the south side,and the maximum overhanging length of the beams is about 17m.Reasonable seismic performance targets and measures were selected,the calculation results of single side long cantilever beams and columns were analyzed and compared by various finite element software;A foundation plan that meets the requirements of cultural heritage protection while eliminating the impact of foundation liquefaction was researched;In order to meet the needs soil covered of large-span roofs,combined with architectural design and spatial requirements,the feasibility and economy of using trusses,structural sloping,and other methods were analyzed;Using peak acceleration as control indicator,the comfort of pedestrian large-span and long cantilever areas was studied.The results show that the above measures can meet the requirements of structural bearing capacity and normal use.