厦门国际中心地下室切割加固

The Cutting and Strengthening of Xiamen International Center Basement

随着社会、经济的发展,地下室的改造加固和深基坑的支护问题不断出现。厦门国际中心主塔楼结构平面布置改变,故需对已施工结束的地下三层结构进行切割改造。采用Sap2000有限元软件建立了地下室模型,计算分析了地下室开大洞时结构的受力情况,发现外墙在水土压力作用下内力超过其承载力,故需对外墙进行支护加固。而后分析对比了钢结构交叉撑与混凝土剪力墙支护的可行性与合理性,最终确定了采用降低水位并在主梁位置设置剪力墙的方案,随后计算设计了新增的剪力墙、洞口加腋的梁板结构,并对施工顺序进行说明。该项目施工完成后的结果表明本文所采取的切割加固方案是安全、合理、可行的。

With the social and economic development, the problems of transformation and reinforcement of basements as well as the supporting of deep foundation pits occur frequently. Because of the structure layout changing of Xiamen Inter- national Center main tower, the already constructed basement of 3 floors should be transformed accordingly. The finite el- ement software Sap2000 was adopted to establish the basement model, and then the structural stress of the basement dur- ing excavation was calculated and analyzed. It was found that under the pressure of soil and water, the internal forces ex- ceeded its bearing capacity, so the external walls needed reinforcement. According to this situation, the feasibility and applicability of steel cross bracing and concrete shear walls reinforcement were analyzed and compared , and the program of setting shear walls around the main beams and lowering the water level at the same time was put forward, followed by the calculation and design of the shear walls and the slab-beam connection with haunch at the entrance of the excavation, meanwhile the construction sequence was described. The condition of the project after the completion of construction indi- cate that the program of cutting and strengthening mentioned in this paper is safe, reasonable and feasible.