后浇带设置问题的深入探讨

Deep investigation on post-cast strip setting

由于国家规范、规程和有关手册对收缩后浇带和沉降后浇带的设置、构造、配筋和沉降计算无统一规定,对于有些内容,不同规范的规定要求又不一样,甚至互相矛盾,致使在设计中使用比较混乱、关键问题交代不清,设计存在安全隐患。通过对收缩后浇带和沉降后浇带的深入探讨,较全面地回答了如下关键问题:后浇带的设置要求及相关构造;后浇带浇筑时间;结构长度超规范时是否必须设收缩后浇带;高层和裙房之间是否必须设沉降后浇带;设沉降后浇带如何控制沉降差、基础和上部结构内力如何计算等。

There is no uniform regulation for the setting,construction,reinforcement and settlement calculation of shrinkage post-cast strip and settlement post-cast strip in national codes,regulations and relative manuals.For some content,the requirements of different codes are different,or even contradictory.As a result,these codes would not been very clearly understood by many designers and are used in disorder in design;the key problems are not clear in design as well,resulting in potential safety hazard in later design.Through the deep investigation of the shrinkage post-cast strip and settlement post-cast strip,some key questions were answered in a relatively comprehensive way,such as setting requirements and related construction of post-cast strip;the casting time of post-cast strip;whether must shrinkage post-cast strip be designed when structural length exceeds the code;whether must settlement post-cast strip be designed between high-rise buildings and podiums;how to control differential settlement and how to calculate the internal force of foundation and superstructure for the settlement post-cast strip designed etc.