Research On Section-optimization Design And Shear Onnector Of PC Composite Box Girder Bridge With Orrugated Steel Webs

With the remarkable progress of the science and technology and the rapid developmentof the computer, we can combine the advanced optimization algorithms and the advancedoptimization ideas with the practical project by the aid of the advanced computer to realizeaccurate, efficient and rapid optimization design of the engineering structure, which is aninevitable trend for the current design of engineering structure in the future. In terms of thedesign principles and design process, traditional structure design and optimization designhave something in common. The differences between the two mainly lie in the evaluationindexes, for example, traditional structure design lacks of economy and security. Whereas, theguiding ideology of optimization design is to know clearly the evaluation indexes such aseconomy and security in the first place. Then combined the advanced algorithms withcomputer technology to accomplish the whole process of the engineering structure, such ascalculation analysis and design, etc. Structural optimization design helps to improve thedesign quality and efficiency. On the baisis of this background and in terms of the variousproblems existing at the present field of bridge design, this paper puts forth section-topologyoptimization design and size optimization design to settle the questions that currently exist inthe field of bridge design, such as repeated design and low efficiency design. In addition, thescope of application of the optimization design can be further expanded.Based on the certain research on section-optimization design of PC composite box girderbridge with corrugated steel webs in Xing Tai city, this paper mainly does research on thefollowing aspects:1. On the basis of the comprehensive reading and research, this paper summarizes thecharacteristics, the development status and the mechanical performance of PC composite boxgirder bridge with corrugated steel webs. Meanwhile, the present condition of structuraloptimization design and the present problems of the optimization design of bridge withcorrugated steel webs are summarized. 2. Research has been made on the general math model, the classification of optimizationdesign and generally used optimization design methods. What’s more, the optimization theoryofANSYS and its optimization design methods are introduced. In addition, the generalprocedures ofAPDL language which can be recognized byANSYS are summarized.3. ANSYS optimization module was expanded by making full use of the APDL language.Furthermore, evolutionary structural optimization (ESO) program which is based on thefunction of stress and displacement sensitivity is written by the aid of APDL. Methords on thetopology optimization of the corrugated steel webs are offered and resonably arranged formsof sectors are gained. ANSYS optimization module helps to calculate the supreme optimalforms of arc bridge. In addition, the differences between the two dimensional elementstopology optimization and the three-dimensional elements topology optimization arecompared. At length, the solution of the realization of structural optimization design whichcombines the optimization algorithms with ANSYS optimization module provides referentialexperiences for the future development of the optimization design software.4. The main mechanical characteristics of section-optimization design of PC compositebox girder bridge with corrugated steel webs are concluded, complete with bending loadingdesign, shear design and stability design. On the basis of the past design experiences and theanalysis of the measurements of the similar building or built bridges, the range of thegeometric parameter of corrugated steel webs is given. Based on the present research onsection-topology optimization, the author writes section optimization program with the helpof the APDL and successfully finishes the total parameter section and multiple constraints ofsection-optimization design of3typical segments of PC composite box girder bridge withcorrugated steel webs well.5. On the basis of the numerical simulation of two connectors, Twin-PBL and S-PBL,this paper does researches on these two connectors from the beginning of the stress to theshear failure. Besides, the differences of mechanical properties between the two connectorsare studied. These mechanical properties include the slippage, carrying capacity and multipleelement prestressing, etc. What’s more, the mechanism destruction and the destruction typesof PBL connectors are summarized, In addition, through the finite element modeling of thepartial segment of the PC composite box girder bridge with corrugated steel webs, the comparable analysis of the mechanical property of the two connectors are made in this paper.Last but not the least, under the guidance of the finite element modeling, this paper comparesand analyzes the effect of these two connectors on their mechanical properties.This paper can provide references for the research on section-optimization design andshear connection of PC composite box girder bridge with corrugated steel webs.