桥建完全合一单跨高架车站结构优化设计

Structural optimization design of single span elevated station fully built along with bridge-buildings

结合工程实例,对桥建完全合一单跨高架车站长悬挑梁、站台层下小层高结构、区间桥梁支座牛腿等结构设计难点进行阐述,并通过多方案模型分析、局部细化体模型分析对设计进行了优化。对双层悬挑梁采用端部设置连接柱的方式加强了刚度,匀化了地震内力;对小层高的电缆夹层,通过设置梁上柱加密柱网,有效减小了梁柱截面并增加了楼层净高;对区间桥梁支座牛腿则设置专门牛腿柱并优化其外形,提高了结构安全性。

Taking the engineering practice as an example,this paper explicates the design difficulties of bridge fully built together with other structures,such as long cantilever beam of one single span elevated station structure,small fl oor height structure under the platform level,and bridge support legs in section.The design is optimized by the analysis of multi scheme model and the analysis of the partly detailed component model.The stiffness of the double layer cantilever beam is strengthened by the end setting connection column,so the internal force of the seismic is homogenized.The cross section of the beam and column is effectively reduced in the small fl oor height structure for cable interlayer so the clearance height is improved.The setting of the optimized special cow-leg pillar for bridge support in section improves the structure safety.