摘要
广州某项目处于岩溶强发育区,在拟建场地大面积为Ⅱ类的情况下,勘察单位根据从天然地面起算的覆盖层厚度将溶沟部分区域的场地类别划分为Ⅲ类。设计单位宏观地从场地概念、微观的以地下室底板底起算覆盖层厚度进行充分论证探讨,认为整个项目场地类别可按Ⅱ类进行设计,并顺利通过超限审查和施工图审查。此外对比了采用《高层建筑混凝土结构技术规程:JGJ 3—2010》[1]及《高层建筑混凝土结构技术规程:广东省标准DBJ/T 15-92—2021》[2]因场地类别不同对超高层结构设计影响的差异,同时对T1栋超高层采用文献[2]分别按Ⅱ类、Ⅲ类场地计算,结果表明:对于长周期结构,地震影响系数对场地类别的敏感性文献[1]低于文献[2];T1栋调整前的基底剪力Ⅲ类场地比Ⅱ类场地大35%,调整后的基底剪力Ⅲ类场地比Ⅱ类场地大10%;T1栋最终按Ⅱ类场地进行设计,节约造价约5%~8%。
A project in Guangzhou is located in an area with highly developed karst landforms.Despite initially being categorized as ClassⅡterrain,based on the large area of the proposed construction site,the surveying unit reclassified certain sections of the site as ClassⅢterrain,considering the thickness of the covering layer from the natural ground surface.The design unit thoroughly discussed and demon‐strated the macro-level concept of the site and the micro-level calculation of the covering layer thickness from the basement floor upwards.Consequently,the entire project was designed as ClassⅡterrain,successfully passing the rigorous review of structural limitations and con‐struction drawing examination.Additionally,a comparison was made between the influence of using Technical Specification for Concrete Structures of Tall Buildings:JGJ 3-2010[1]and Technical Specification for Concrete Structures of Tall Buildings:Guangdong Standards DBJ/T 15-92-2021[2]on the design of super high-rise structures due to differences in terrain classification.Specifically,the T1 tower of the project was analyzed using both the Literature[1]and Literature[2]for ClassⅡand ClassⅢterrains.The results indicated that for long-period structures,the seismic coefficient sensitivity to terrain classification was lower in the national standards than in Literature[2].Prior to adjust‐ment,the base shear of the T1 tower in ClassⅢterrain was 35%higher than that in ClassⅡterrain.After adjustment,the base shear in ClassⅢterrain was 10%higher than that in ClassⅡterrain.Ultimately,the T1 tower was designed based on ClassⅡterrain,resulting in a cost-saving of approximately 5%to 8%.
作者
龙秀海
丘友威
罗沁
林家豪
胡剑波
段称寿
LONG Xiuhai;QIU Youwei;LUO Qin;LIN Jiahao;HU Jianbo;DUAN Chenshou(Guangdong Architectural Design&Research Institute Co.,Ltd.Guangzhou 510010,China;Guangdong Yuehai Land Holdings Co.,Ltd.Guangzhou 510010,China)
出处
《广东土木与建筑》
2023年第12期52-56,共5页
Guangdong Architecture Civil Engineering
关键词
岩溶强发育区
场地类别
覆盖层厚度
Ⅱ类场地
Ⅲ类场地
地震影响系数
highly developed karst areas
terrain classification
thickness of the covering layer
classⅡterrain
classⅢterrain
seis‐mic coefficient
