Development and Experimental Verification of Inelastic Design Procedures for Steel Bridges Comprising Noncompact Girder Sections

桥梁设计的最新进展清楚地表明，需要广义的非弹性钢梁桥梁设计程序，其中包括所有可能的梁截面形状，包括紧凑和非紧凑。AASHTO LRFD桥梁设计规范鼓励使用非弹性设计程序，证实了这一需求。本研究项目的目的是通过建立桥梁行业通常使用的非密实钢截面的非弹性荷载特性，并开发准确预测非弹性荷载结构性能的分析和结构行为模型，填补有关钢梁桥梁非弹性性能的知识空白。​本文将对三个大型钢梁进行混凝土桥面开裂和混凝土-钢滑移、渐进屈服效应以及密实和非密实组合梁的非弹性弯矩-旋转行为等现象的研究。这些试验结果，连同其他相关资料，将用于制定全面的、实用的非密实、复合和非复合梁的非弹性设计程序，目前的设计规定尚未涵盖这些问题。//

Advances in the state-of-the-art of bridge design clearly indicate the need for generalized inelastic steel girder bridge design procedures which include all possible girder cross- sectional shapes, both compact and noncompact. This need is confirmed by the proposed AASHTO LRFD Bridge Design Specifications' encouragement to use inelastic design procedures. The purpose of this research project is to fill in the knowledge gaps pertaining to inelastic behavior of steel girder bridges by establishing the inelastic load characteristics of noncompact steel sections typically used by the bridge industry and developing analytical and structural behavior models that accurately predict the performance of inelastically loaded structures. Three large-scale steel girders will be investigated for such phenomena as concrete deck cracking and concrete-steel slip, progressive yielding effects, and inelastic moment-rotation behavior of compact and noncompact composite girders. The experimental results, in conjunction with other relevant information, will be used to develop comprehensive, practical inelastic design procedures for noncompact, composite and noncomposite girders, which are not presently covered by current design provisions.//