超低温下有黏结预应力混凝土梁受弯性能试验研究
发布时间：2018-08-22 17:12
【摘要】：为确保预应力混凝土结构在超低温下的安全使用,借助超低温冷库和自制保温-加载装置,在不同温度点(20℃、-40℃、-70℃、-100℃)下对不同张拉控制应力(0fptk、0.75fptk)的12根有黏结预应力混凝土梁的受弯性能进行了试验研究。试验结果表明:有黏结预应力混凝土梁在超低温下仍能较好地符合平截面假定;在试件开裂前,梁的刚度受温度和预应力度的影响较小,而试件开裂后,梁的刚度随温度的降低而提高;低温下,预应力仍能有效提高构件的抗裂度和抗弯刚度;随着温度的降低,试件开裂荷载呈直线上升,试件的极限承载力呈加速上升,但其提高程度小于开裂荷载,试件开裂荷载与极限荷载的比值增大,变形性能降低;考虑材料低温效应后,代入规范公式得到的极限承载力是可靠的,而开裂荷载计算值较实测值大,仍需进行进一步研究。
[Abstract]:In order to ensure the safe use of prestressed concrete structures at ultra-low temperature, the ultra-low temperature cold storage and the self-made heat preservation and loading device are used to ensure the safety of prestressed concrete structures. The flexural behavior of 12 bonded prestressed concrete beams with different tension-controlled stress (0fptkn 0.75fptk) at different temperature points (20 鈩，
本文编号：2197776
[Abstract]:In order to ensure the safe use of prestressed concrete structures at ultra-low temperature, the ultra-low temperature cold storage and the self-made heat preservation and loading device are used to ensure the safety of prestressed concrete structures. The flexural behavior of 12 bonded prestressed concrete beams with different tension-controlled stress (0fptkn 0.75fptk) at different temperature points (20 鈩，
本文编号：2197776
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