某输煤栈桥改造加固工程卸荷技术研究

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中图分类号：TU391文献标识码：A

Abstract： To enhance the collaborative working performance of the newly added brackets and supports on a certain coal conveying bridge under load conditions and to reduce the reinforcement volume of the original structure， this study utilized jacks to implement load relief on the original structure. Through simulation using finite element software with different levels of load relief and relief methods， the changes in internal forces of members， jack readings， and the number of over-limit components were systematically compared. The results show that when the deformation of the original structure returns to 0mm ， the load relief degree is optimal， which can simultaneously reduce the internal forces of the structure and decrease the reinforcement workload; during construction， a scheme of overall proportional displacement load relief can be adopted， which enables the internal forces and displacements to change linearly， achieving a safe and controllable transition of the structure to the target load relief state.

Key words： coal transfer trestle; renovation and reinforcement; bolt ball node; unloading degree; unloading method

在既有结构负载状态下的加固工程中，应力滞后现象普遍存在于整体加固和局部构件加固过程中，导致新增构件与原结构难以形成有效协同工作机制。（剩余6424字）