Study On Seismic-resistance And Wind-resistance Of Aqueduct

Aqueduct is a kind of essential construction for transporting water across railway, road, river and valley. It is also used extensively in flood discharge, diversion and so on. It is an important cross-building in water transport, water supply and channel system.Water transport across different drainage areas and different regions is necessary because of large mountainous area and uneven rainfall distribution in our country. Large numbers of related projects including a lot of aqueducts are needed for water resource transport. 49 large-scale aqueducts should be constructed in the layout of Middle Route of South-to-North water transfer project,which illustrates the importance of the aqueduct bridge in the hydraulic engineering.Specifications for aqueduct has not promulgated in our country yet. There is also no concrete prescription for aseismatic design in Specifications for seismic design of hydraulic Structure. And wind-resistance design according to Specifications for building structure.The study on seismic-resistant especially wind-resistance doesn't get enough attendance at present.This paper summarize a large number of domestic and international documents about fluid-structure dynamic coupling action, the earthquake responses , case study of a wind destroyed aqueduct mechanism, the optimal design based on reliability analysis. Many fruits are collected in order to reduce or combat natural disasters to guarantees the security of the aqueduct. Consulting the ripe achievement of bridge antidetonation and anti-wind at present, we research the antidetonation and anti-wind of the aqueduct. The main content is as follows:1. According to characteristic of enormous water body, we study the fluid-structure dynamic coupling action of aqueduct structure, simulate the water body encourage power characteristic by linear Houser Model and non-linear ALE finite element model. Observation Tests indicate that the movement of aqueduct water body demonstrates the obvious non-linear characteristic under external encourage and ALE finite element modelcan simulate the actual conditions more accurately, which can be the basic model for dynamical analysis under under external encourage.2. This paper adopt the aqueduct body idealized as an assem blage of girder finite element model of the aqueduct structure, utilize finite element method software ANSYS , analyse the lateral seismic responses of Shuang-ji River aqueduct subjected to wave input are calculated. Under 3 conditions (aqueduct without water ^ aqueduct with half water and aqueduct with full water),analyze the dynamic characteristics under the earthquake function and fluid-structure coupling situation.Under EL-Centro earthquake power Time history response method analysis.The computation results lay the foundation for systematic design of large aqueduct.3. Study the aqueduct static wind load and wind-induce dvibrations action when wind direction and water direction is vertical. Based on wind tunnel test study, and wind load shape coefficient of the aqueduct body structure are obtained. Consider the fluid-structure coupling action,study method for wind-induce dvibrations analysis of the aqueduct shake.Finally,carry on the discussion to aqueduct wind destroy mechanism combining some instances; give some suggestions for the design and construction of the wind aqueduct structure.4. Earthquake intensity is the foundation of aseismatic design, this text brings forward three levels fortifications principle. Proposes the optimal earthquake intensity based on reliability, make the design of agueduct economic and optimal in different security levels. Popularize this thought to the aqueduct resist-wind design. Put forward some measures of the antidetonation and resist-wind for aqueduct experience and achievement of antidetonation of bridge and resist-wind design, according to achievement of aqueduct power characteristic from wind loads and earthquake loads analyses.