论文部分内容阅读
在现代桥梁建设中,斜拉桥作为一种拉索体系,比梁式桥的跨越能力更大,是大跨度桥梁的最主要桥型,它是由承压的塔、受拉的索和承弯的梁体组合起来的一种结构体系。斜拉桥拉索与主塔的锚固区是将斜拉桥的上部结构自重和所承受的所有外荷载传递到索塔的重要结构,而且锚固区构造和受力状态均较为复杂,通常是控制桥塔设计的关键部位。一般索塔在设计时内部均布置较多的环向预应力来保证结构的安全性,但在施工阶段由于环向索的空间局限性,在预应力张拉时伸长量往往超出规范要求的±6%范围,本文通过对某斜拉桥模型试验及现场施工实际数值进行分析,总结出一些实际分析结果及该问题产生的原因,可供施工中借鉴。
In the modern bridge construction, the cable-stayed bridge, as a kind of cable system, is more capable than the beam bridge and is the most important bridge type of long-span bridges. It is composed of pressure-bearing towers, tensioned cables and bends A combination of beam body structure system. The anchorage zone of the cable stayed bridge and the main tower is an important structure that transmits the self-weight of the superstructure of the cable-stayed bridge and all the external loads it takes to the pylon. Moreover, the structure and stress state of the anchorage zone are complicated and usually controlled Pylon design of the key parts. In general, the pylon has more circumferential prestressing to ensure the safety of the structure. However, due to the space limitation of the hoop cable during the construction phase, the elongation at the prestressing tension often exceeds the specification ± 6%, this paper analyzes the actual test results of a cable-stayed bridge model test and on-site construction, summarizes some actual analysis results and the causes of the problem, which can be used for reference in construction.