摘要：为研究GFRP沥青混合料界面裂尖力学特性,对混合料进行强度分析,设计了含预制界面裂纹的双材料巴西盘试件,实测了加载角度在25°90°之间27个巴西盘试件断裂荷载、裂纹扩展路径和断口形式等试验数据,结合试验数据建立了考虑GFRP正交异性双材料巴西盘有限元模型,采用数值外插法反算了界面应力强度因子,进行了GFRP沥青混合料巴西盘断裂力学性能的理论分析和试验研究.结果表明,含预制界面裂纹的双材料巴西盘试件能全面地反映GFRP沥青混合料的断裂形态,是一种有效的试验方法;以界面应力强度因子作为力学评价指标,能够很好地解释试验现象;含预制界面裂纹的GFRP沥青混合料巴西盘符合椭圆强度准则.

摘要：通过结构计算分析了波形钢腹板组合箱梁桥横梁,针对横梁裂缝宽度超限、承载能力不足的问题,提出增设预应力钢束和增加特殊支座及预应力钢束的两个加固方案。对横梁加固方案进行了计算,分析加固横梁应力和抗裂性指标,分析结果表明,横梁加固方案二从根本上解决了横梁存在的问题。最后从计算结果、施工难度与工作量、钢束锚固等因素考虑,选取了增加特殊支座及预应力钢束的横梁加固方案。

摘要：利用有限元软件对某曲线箱梁桥进行分析计算,对比分析在跨间设置不同数目和不同位置横隔板的情况下,箱梁顶板内外缘正应力的变化.分析结果表明:横隔板设置的位置和数量对曲线波形钢腹板箱梁桥的应力有显著影响,并为波形钢腹板曲线箱梁桥的设计提供参考.

摘要：波形钢腹板不能抵抗轴向力作用,波形钢腹板PC组合箱梁的剪力滞效应与PC箱梁不同。依托一箱九室波形钢腹板PC组合连续箱梁桥,建立了有限元模型,分析了荷载作用下混凝土顶底板的剪力滞效应。结果表明,波形钢腹板PC组合箱梁顶、底板均具有正剪力滞效应,顶板剪力滞更为明显;在支点具有横隔梁构造的情况下,箱梁跨中截面剪力滞较大,在设计时需要给予注意。

摘要：Determination of collapse load-carrying capacity of elasto-plastic material is very important in designing *** problem is commonly solved by elasto-plastic finite element method(FEM).In order to deal with material nonlinear problem involving strain softening problem effectively,a new numerical method-damped Newton method was *** iterative schemes are discussed in detail for pure equilibrium *** the equilibrium model,the plasticity criterion and the compatibility of the strains are verified,and the strain increment and plastic factor are treated as independent *** avoid the stiffness matrix being singularity or condition of matrix being ill,a damping factor α was introduced to adjust the value of plastic consistent parameter automatically during the *** to the algorithm,the nonlinear finite element program was complied and its numerical example was *** numerical results indicate that this method converges very fast for both small load steps and large load *** with those results obtained by analysis and experiment,the predicted ultimate bearing capacity from the proposed method is identical.

摘要：结合汾灌高速公路及苏州绕城高速公路的施工实践,从混合料组成设计、现场拌和、整型、碾压及组合等方面阐述了二灰土底基层的施工工艺,提出了各组份计量控制及检测的方法。

摘要：以建成的某大桥(47 m+52 m+47 m)波形钢腹板PC组合多跨连续箱梁桥为背景,按照桥梁在建成后的运营对桥梁的整体的静力学特性进行有限元分析,验证这种桥型结构的上部结构的底板和顶板的混凝土的应力、结构刚度、抗裂性能在长期和短期的效应组合下能否满足现行的规范的要求,结果表明其有限元模型在各种工况的组合下,结构能够很好满足规范和设计文件的要求。