大跨度预应力混凝土框架梁的抗震设计  

Seismic Design of Prestressed Concrete Frame Beams With the Large Span

作　　者：荣维生[1] 张柏同[2] 

机构地区：[1]中国建筑科学研究院工程抗震研究所,北京100013 [2]吉林石油集团有限责任公司勘察设计院,吉林松原138000

出　　处：《建筑科学》2010年第7期80-84,共5页Building Science

摘　　要：详细介绍三个工程中大跨度预应力混凝土框架梁的抗震设计过程,强调了大跨度预应力梁在抗震设计时,不能仅注重预应力筋配置对控制裂缝和减小挠度起着积极的作用,而且还要关注配置过多的预应力筋容易导致梁端截面混凝土受压区高度和纵向受拉钢筋换算配筋率不能满足规范要求,同时,也指出大跨度预应力梁在设计中的特殊性。The process of seismic designs for prestressed concrete frame beams with the large span in the three projects is presented detailedly.The paper emphasizes that the seismic design for the prestressed concrete beams couldn＇t only pay attention to that laid tendons at the beam produce the positive action to control the crack width and decrease the deflection,but would consider that overmany tendons bring that the relative neutral axis depth and the conversion ratio of the total longitudinal tensile reinforcement in sections at the beam ends couldn＇t satisfy the requirements of the codes.Meantime,some specialities of the design for prestressed concrete beams with the large span are pointed out.

关 键 词：预应力混凝土 框架梁 大跨度 抗震设计 相对受压区高度 受拉钢筋换算配筋率 

分 类 号：TU378.2[建筑科学—结构工程] TU352.1