忻鼎康  滕裕珠  施荣华
（上海建筑科学研究院预应力所 200032）

[提要]  使用有限元仿真技术计算了上海科技馆地下室超长弧形墙体的当量温度应力分布规律和预应力应力场分布规律。分析表明，对于超长弧形墙体，预应力产生的应力场可以抵消由混凝土收缩和温度产生的部分拉应力，对阻止墙体收缩裂缝和温度裂缝出现是有效的。仿真计算是在ANSYS程序上完成的，预应力筋和混凝土之间相互作用的有限元约束处理方法可以推广应用于其它预应力构件的仿真计算。
[关键词]  仿真计算  裂缝  当量温度  地下室外墙  预应力  有限元

With use of the finite element computation,the equivalent temperature stress distribution law and the prestress distribution law of overlong exterior wall of basement are acquired. The analysis shows that the stress produced by prestress can, to a great extent, counteract the tension stress caused by shrinkage of concrete and change of temperature. It is also effective to prevent the crack caused by shrinkage ancl temperature.The simulated-computation is completed based on the ANSYS program. The restriction method of finite element to deal with the interaction between the prestress tendon and concrete can be referred to the simulated-computation of other prestress members.
Keywords: simulated-computation; crack; equivalent  temperature; exterior  wall; basement; prestress; finite  element