【摘 要】
：
400m级跨径的连续梁桥是当前桥梁工程难以有效突破的一个技术瓶颈.基于减轻结构自重可实现提升桥梁跨径的理念,本文采用体外预应力和活性粉末混凝土(RPC)相结合的措施,并采用
【机 构】
：
湖南大学湖南大学;国防科学技术大学
论文部分内容阅读
400m级跨径的连续梁桥是当前桥梁工程难以有效突破的一个技术瓶颈.基于减轻结构自重可实现提升桥梁跨径的理念,本文采用体外预应力和活性粉末混凝土(RPC)相结合的措施,并采用新的箱梁截面形式,提出了一种400m级连续箱梁桥方案.在试设计的基础上,对RPC梁桥上部结构的受力情况进行了考察.结果表明,这种新型连续箱梁桥的结构构造和受力特性介于传统PC箱梁桥和钢箱梁桥之间,可适用于400m级连续梁跨径,经济上合理,可作为超大跨径梁桥的一种备选方案:与传统PC箱梁桥相比,RPC箱梁桥可大幅减轻结构自重,变三向预应力为纵向单向预应力,同时还可有效降低传统混凝土箱梁开裂风险。
其他文献
Modem slender structures are subjected to high stress ranges when subjected to live load,hence higher vulnerability to fatigue failure can be assumed.Struct
Structural elements composed by riveted angles and sheets exhibit over time dangerous distortions,provoked by the rust grown inside the interstices and to i
Concrete carbonation and rebar corrosion are two main processes accounting for the life cycle operational performance degradation for reinforced concrete (R
Long-span PC continuous rigid-frame bridge with high pier has many advantages as follows: high structure rigidity,lower negative moment in girder at pier to
Construction of cable-supported bridges using highstrength cables such as for cable-stayed bridges or suspension bridges is increasing,owing to the continuo
Tension forces of hanger ropes have been recognized and utilized as an important parameter for health monitoring of suspension bridges.Conventional vibratio
During construction of a cable stayed bridge or the similar structure,the stabilizing measures by temporary tied-down cables are generally used to resist st
Since the cable is one of primary structural elements in a cable stayed-bridge,the tension force of a cable in the bridge is very important parameter to be
锚碇是重要的承力部件,合理经济的锚碇基础可以提高特大跨悬索桥方案的竞争力.本文结合工程实例,归纳了地连墙、沉井、扩大基础等目前应用较多的几种锚碇基础形式的特性及应
波纹钢腹板矮塔斜拉桥是"矮塔斜拉桥"和"波纹钢腹板预应力混凝土箱梁桥"的结合.继世界上两座波纹钢腹板矮塔斜拉桥(日本栗东桥和日见桥)建成以来,该桥型得到了工程界的广泛关