(1 上海大学土木工程系，上海 200072； 2 宁波市核力建筑设计有限公司，宁波 315040；3 浙江大学宁波理工学院，宁波 315040； 4 香港中文大学，香港)
［摘要］某商业中心地下汽车库采用了宽扁梁和平板柱多层预应力混凝土结构，在可利用的地下建筑空间内比普通混凝土结构多建了1层车库。其人防、消防等偶然荷载远大于正常使用荷载，使得预应力混凝土构件抗裂设计在这两种荷载下很难同时满足设计要求，以优先满足正常使用荷载，辅以普通钢筋增强构件的延性来满足偶然荷载下的设计要求。采用塑胶管、直线形布筋方式减小预应力摩擦损失。宽扁梁结构的梁柱节点予以加强，以保证楼面荷载的顺利传递。
［关键词］预应力混凝土；楼盖；宽扁梁；预应力摩擦损失
Design of prestressed reinforced concrete floor structure of underground parking
Wu Zhehua1,4, Chen Chunjian2，Yang Junlong3(1 Department of Civil Engineering, Shanghai University, Shanghai 200072, China;2 Ningbo Nucleus Electricity Architectural Design Institute, Ningbo 315040, China;3 Ningbo Institute of Technology, Zhejiang University, Ningbo 315040, China;4 The Chinese University of Hong Kong, Hong Kong, China)
Abstract:Focus on a tower building in central business district, the structural plan arrangement of its underground parking is optimized. The flat-beam and flat-plate structures are applied. Parking space of more than a floor is obtained. Because accident loads,such as defending load and fire protecting load,is more larger than normal live loads, it is difficult to satisfy the design requirement of the resist cracking in the prestressed concrete members simultaneously. It is suggested that the normal condition be priority and general steel be assisted to reinforced ductility of the members. Prestressed friction loss is controlled by embedding plastic pipes and using linear tendon shape in the super long structures. The joint of beam-column in the flat-beam structure is strengthened for load transferring.
Keywords:prestressed concrete；floor structure; flat-beam；friction loss
作者简介：邬喆华，博士后，副教授，高工，副研究员，一级注册结构工程师，注册监理工程师，一级注册建造师，二级注册建筑师，计算机应用软件工程师，Email: wuzhehua@tom.com。
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