预应力平板结构的内力重分布和裂缝控制

INTERNAL FORCE REDISTRIBUTION AND CRACK CONTROL OF PRESTRESSED CONCRETE FLAT-FLOORS

1.
1. Key Lab of RC &PC Structures of Ministry of Education,Southeast University,Nanjing 210096,China;
2.
2. Shanghai Baoye Construction Co. ,Shanghai 200941,China

摘要: 采用等代框架法设计无粘结预应力混凝土平板结构存在不足之处。通过对无梁楼盖弯矩形态的分析,提出为了控制其裂缝宽度,正常使用极限状态应以弹性弯矩作为设计依据,而对于承载能力极限状态所对应的内力,可在控制使用荷载裂缝宽度前提下适当考虑内力重分布。通过计算分析总结内力重分布的调幅幅值,并对调幅后的弯矩分布进行了讨论。最后,给出了相应的设计建议。
- 预应力 /
- 平板 /
- 裂缝 /
- 内力重分布
Abstract: This paper pointed out the shortage of equivalent frame method to design unbonded prestressed concrete flat-floors.By analyzing the moment distribution of such a structure,it was indicated that the design of the serviceability limit state should be based on the elastic moment in order to control the crack width,and as to the ultimate state,the internal force redistribution should be taken into consideration while the crack width under service load was guaranteed.Based on the above mentioned principles and some calculations,the paper concluded the magnitude of internal force redistribution and discussed the moment distribution after modification.Finally several design suggestions were put forward.
- prestressing /
- flat-floor /
- crack /
- internal force redistribution

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