Stiffening Girder Configuration And Safety Control Of Ultra Small Span Ratio Suspension Bridge In Mountainous Area

In the traditional calculation concept,the rigid truss suspension bridge of the simple supported bridge is not considered in the calculation of the force of the structure of the bridge deck,but only as the load applied on the stiffening beam.In this article,through LanPing County huang's reservoir in yunnan province Shi Deng suspension bridge and triangle river suspension bridge load test data,to find the bottom chord of steel truss stiffening girder stress and the theoretical calculation of the measured stress difference is very big,the upper chord stress is far less than the measured stress theory,the measured stress of bottom chord is higher than the theoretical calculation of the stress,shows that the stress of the stiffness of the bridge deck is involved in the whole.In this paper,the influence factors of the load test are analyzed through the static load test.This article mainly completes the following work:First,The mixed steel structure is described in detail,and the difference between the mixed steel structure and the deck system structure of the simply supported bridge is explained.In this paper,the calculation method of mixed steel structure is introduced.Methods and procedures for calculating structures within finite element.A simple example is given to illustrate the influence of different stiffness participation on structural characteristics.By using Midas Civil finite element analysis software,different equivalent methods are adopted for the bridge panel.The ratio of the stiffness of the bridge deck system of shideng bridge to the overall effect is determined,which provides a reference for the analysis of the stress of the bridge deck system of the same type of bridge.Second,this paper expounds the Shi Dengqiao static and dynamic load load test,the method of using the above chapters put forward the increase of the bridge deck is a third method to compute longitudinal beams as theoretical data,and the contrast analysis with experimental data and theoretical data of the static load test stress under the working condition of each calibration coefficient satisfies the requirement of specification,confirmed the rationality of the calculation method.Third,based on ANSYS,a local analysis model was established and two optimization models were proposed.Small longitudinal girder-concrete composite structure bridge deck and corrugated-concrete composite bridge deck system.By studying the influence of the parameters on the two structures,the influence of the stress on the bridge panel under the condition of self-gravity and the most adverse automobile load is obtained,and the optimal section form is determined.The advantages of combinatorial structure are proved more fully by comparing the dynamic characteristics,economic characteristics and durability.Last,in the actual structure of the load,the influence of temperature on the structure of the test influence is very big,this section through the actual temperature data,the main cable,stiffening girder and cable clip,cable tower structure are analyzed in the overall temperature,determine the effects of temperature values.