预应力连续T梁设计计算说明书.doc

摘 要 方案比选依据安全、实用、经济、美观的原则，最终选择方案二是预应力钢筋混凝土简支转连续T型梁桥为推荐方案，该方案梁高为1.8m。主梁内力计算时分别对简支体系和连续体系进行计算，既保证了施工中的安全又保证了成桥以后的使用安全。在张拉预应力时采用后张法两端张拉，然后再进行孔道压浆，在计算预应力损失时，由于采用后张法，不考虑第三项损失。 本设计桥梁下部结构为双柱式墩，基础采用钻孔灌注桩基础。本设计仅对桥墩进行了配筋及强度验算。 关键词：预应力，连续梁桥，桥墩，桩基础 Abstract The Xiangfan of Hubei to Shiyan freeway of The First of Sanchahe bridge site the federal of hurong highway host skeleton line section K431+230 place， what overstrides the Youxi. River and courseand route orthogonal， river bed is stable， the river course is suitable straight， Usually in the ditch the water volume is less， ditch sole deeper，gradient bigger， the flood discharge is smooth. This bridge planelinear is a straight line， with running water direction orthogonal. As well as gave the material according to the terrain to design three compared to choose the plan， the plan one is Y the shape column the king post rigid frame bridge， the plan two uses the box shape empty stomach arched bridge， the plan three is continuously the pre-stressed continuous bridge. The plan compared to chooses the basis safely， practical， economical， the artistic principle， finally chooses the plan three is the pre-stressed continuous bridge is the recommendation plan， This plan uses a box of two room constant section continuous bridge， The altitude of king post is 1.8m. Calculation of Internal Forces of the main beams were simply supported at the system and continuous system, the purpose is to ensure the safety of the construction of the bridge and ensure the safe use of the future. In the use of tensioned prestressed post-tensioned tensioned at both ends, and then grouted to channel in the calculation of prestress losses, as a result of the use of post-tensioned, the third loss is not considered. The bridge substructure is the bridge pier pillar， The foundation uses the drill hole to pour into pile foundation.This design only carried on to the bridge pier has matched the muscle and the intensity checking calculation. Key words :Pre-str