PRESTRESS LEVEL IN STRESS-LAMINATED TIMBER BRIDGES
PRESTRESS LEVEL IN STRESS-LAMINATED TIMBER BRIDGES
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应力层压木桥的预应力水平
DOI：
10.1061/(asce)0733-9445(1990)116:11(3003
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
M. Accorsi
中科院分区：
文献类型：
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作者：
Edward F. Sarisley;M. Accorsi
应力层压木桥的一个重要考虑因素是保持桥面板中的预应力。本文介绍了一个原型应力层压木桥面的预应力水平的实验和分析调查的结果。在张紧杆上使用碟形弹簧可以降低预应力系统的有效刚度，从而使预应力损失最小化。碟形弹簧也为预应力的测量提供了一种实用的技术。它还表明，由于木材蠕变的预应力力的初始损失可以准确地建模为时间的幂函数，该模型可用于预测的目的。温度变化对预应力水平的影响进行了研究，结果表明，这是一个显着的效果，应包括在未来的设计规范。最后，分销渠道的性能进行了分析评估，并确定了性能参数。
An important consideration in stress-laminated timber bridges is the retention of the prestress force in the deck. This paper presents the results of an experimental and analytical investigation of the prestress level in a prototype stress-laminated timber-bridge deck. Loss of prestress force can be minimized using disc springs on the tensioning rods that reduce the effective stiffness of the prestressing system. The disc springs also provide a practical technique for measuring prestress force. It is also shown that the initial loss of prestress force due to wood creep can be accurately modeled as a power function of time and that this model can be used for predictive purposes. The effect of temperature changes on the prestress level is investigated, and it is demonstrated that this is a significant effect that should be included in future design specifications. Finally, the performance of the distribution channel is evaluated analytically and a performance parameter is identified.