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【答案】应助回帖
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ringzhu(金币+30, 翻译EPI+1): 2010-11-20 11:22:13
ringzhu(金币+20): 2010-11-20 11:22:19
In recent decades, with the progress of science and technology, the development of bridge structure are obtained remarkable achievement, and Bridges and experimental research on development of bridge structure design and calculation theory, to solve problems in production practice plays an important role. To ensure the normal use of both Bridges, need for bridge test, the test of load bearing capacity of the structural characteristics and compliance with design standards and requirements. Based on the EZhouShi binhu bridge load test and theoretical calculation and the related research.
Master bridge load test test method is a prerequisite for success, this paper, dynamic load test prohibit bridge method is studied. In the static load test method of static load test plan for a more detailed presentation, including test object selection, load condition design, principles of measuring-point arrangement, load test and loading method to establish the choice, and the test data processing and evaluation index is described, In the dynamic load test method of dynamic test routine, bridge project are introduced, and presents a practical bridge load test of the commonly used method for dynamic loading and dynamic characteristics of the bridge, the evaluation indexes were introduced and summarized.
In practical engineering survey, the corresponding contents according to the relevant requirements of bridge detection, the apparent test and the bridge of the dynamic and static load test, the comprehensive evaluation of the structure of bearing capacity of safety compliance with design standards and requirements. For every component in the apparent test without damage, craze, deformation, seepage, reinforcement corrosion phenomenon such as water, siltation detailed inspection, measuring its location and the scope for crack detection, including crack distribution, width and depth, and the structure of the linear and elevation measurement.
According to the characteristics of continuous rigid-frame bridge study for a detailed scheme of static and dynamic load test. In the static load, the span of the control section, edge across the maximum deflection and strain, and the rigid-frame structure of the pier pier beam in the negative moment control section near maximum strain were measured. Using finite element software modeling for testing bridge "MIDAS" calculation and analysis, and the actual experiment data analysis, comparison of the actual state of the bridge to assess capacity. In the dynamic load test, the bridge structure in the car and different pulse, the dynamic response speed conditions, the structure calculating the signal frequencies, damping ratio and the speed of impact coefficient.
The static and dynamic load test bridge study the overall structure of the bridge, the binhu basic condition, safety performance requirements. Results show that the apparent check surfacing layer wear relatively serious, structure, many existing crack expansion joints has basic loss function, affect the safety of the structure and durability, soon. The results of this bridge maintenance provides guidance opinion reinforcement of similar Bridges with the test and reference value.
Keywords: load test, the apparent test, both Bridges and finite element method |
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