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Energy-dissipation and shock-absorption tie beam for double-limb pier

InactiveCN105839518AImprove static and dynamic stabilityImprove static and dynamic stability performanceBridge structural detailsVertical planeEngineering
The invention discloses an energy-dissipation and shock-absorption tie beam for a double-limb pier and relates to the technical field of bridge building. The tie beam comprises four sleeves fixed in the same vertical plane in an X-type crossed manner, wherein the two longitudinally adjacent sleeves form an included angle alpha; a sliding telescopic rod is arranged in each sleeve, a spring is arranged between each sliding telescopic rod and the bottom of the corresponding sleeve, and the outer end of each sliding telescopic rod is fixed on the double-limb pier; a sliding friction surface is arranged between each sliding telescopic rod and the corresponding sleeve, and energy dissipation and shock absorption are realized through heat generation during sliding friction of the sliding friction surfaces. The sliding telescopic rods are connected with the double-limb pier, a pier body is horizontally and laterally restrained by means of the X-type crossed sleeves, and the static-dynamic stability of the pier is improved; by means of friction between each sliding telescopic rod and the corresponding sleeve, seismic energy borne by the pier can be converted into heat energy to be dissipated through heat generation during friction, seismic dynamic response of the pier, the plastic hinge development degree and the like can be reduced, and the situations that main structures such as the pier, a girder and the like are damaged in earthquakes can be effectively avoided or reduced.
Owner:SHIJIAZHUANG TIEDAO UNIV

Method for user terminal dynamic position management by IP multimedia sub-system

The invention provides a method used for leading an IP multimedia sub-system to carry out dynamic position management on a user end (UE); the position management of UE is carried out by a dynamic position updating mechanism DLU method; the conversation behaviour of UE is led in a position updating process, namely, corresponding operation on register timer (RT) is added during the conversation process of UE without changing the register process in an IMS, thus reducing the generation frequency of periodic position updating request and the generation times of the periodic position updating request on the basis of extremely little changing quantity. Furthermore, when the UE roams from the home network to the visit network and IOS event or re-register CCRR or PRR event occurs, the method of the invention adopts a two-step position management mechanism TTLM method where home network and visit network are respectively registered and a dynamic position updating mechanism DLU method to carry out the position management on the UE. The method of the invention solves the defects of the prior art better, effectively reduces the load of the HSS and S-CSCF, reduces the transmission quantity of the position updating signals, and improves the utilization ratio of the network resource.
Owner:BEIJING UNIV OF POSTS & TELECOMM
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