(哈尔滨工业大学土木工程学院  150090)
［提要］  结合预应力混凝土结构理论研究与工程实践，对预应力混凝土结构设计中应注意的若干问题进行了分析和讨论，其中包括施工阶段预应力混凝土受弯构件的反向变形限值、张拉预应力筋产生反向斜裂缝的原因与预防、预应力筋弯折时强度及张拉控制应力的折减、无粘结预应力混凝土楼盖连续坍塌的预防、预应力筋张锚位置不当引发柱根直剪破坏的预防、预应力连续结构后浇带的设置及补偿预应力筋的布置与张拉方案、双向板单向布置并张拉预应力筋的可行性、多跨连续板非板端张拉方案及各层预应力悬挑结构协同工作的建议方法等，提出了相关建议。
［关键词］  预应力混凝土结构  预防  设计建议
Some Noteworthy Problems in Design of Prestressed Concrete Structures/Zheng Wenzhong, Xie Hengyan (School of Civil Engineering，Harbin Institute of Technology, Harbin 150090, China)
Abstract:Combined with theory and practice of prestressed concrete structures, some noteworthy problems are presented, such as the limitation of reverse deflection for prestressed concrete flexural members during construction, the cause and precaution against the reverse diagonal crack and reduction for strength and controlled tensioning stress when prestressing tendons are bended. The precaution against a series of collapse of unbonded presressed concrete floors, measure to avoid direct shear failure of column root caused by incorrect location of anchorage, arrangement of postcast strip and compensated prestressing tendons and the tensioning method are proposed. The feasibility of arranging oneway prestressing tendons in twoway slab and nonend tensioning method for multispan continuous slab are introduced. The recommended method to make pretressed cantilever structure in each floor work together is given.
Keywords:prestressed concrete structures; precaution; design proposal
*国家自然科学基金项目(50178026)。