Transverse connection strengthening prestressed concrete T-girder bridge is an effective method to enhance the integrality of the T-girder bridge. In a previous work, a new kind of diaphragm transverse connections (DTCs) has been proposed and its validity has been proved. Aiming to study the influential parameters for the strengthening effect, finite element analysis is carried out based on a 30 m prestressed concrete T-girder bridge in this study. The considered influential parameters are T-girder spacing, T-girder height, brace thickness, and installation location of the DTCs. The deflections and load distribution factors of the prestressed concrete T-girder bridge are calculated to evaluate the impact of each parameter on the strengthening effect. Furthermore, the influence of brace thickness and T-girder height on axial forces of the DTCs and connection force is studied. The results show that the strengthening effect with DTCs installed at midspan is the best option. With T-girder height increasing, the deflections of the T-girder reduce and the maximum load distribution factor increases. Besides, increasing the brace thickness of DTCs or decreasing the T-girder spacing improves the strengthening effect. By comparing the axial force with the buckling critical force, it shows that the stability of the braces is adequate. Finally, design recommendations are given for the 30 m prestressed concrete T-girder bridge strengthening.

中文翻译：

---

横向连接加固预应力混凝土T型梁桥的参数分析与设计

横向连接加固预应力混凝土T型梁桥是提高T型梁桥整体性的有效方法。在以前的工作中，已经提出了一种新的横隔膜横向连接（DTC），并证明了它的有效性。为研究影响加固效果的参数，本研究对一座30 m预应力混凝土T型梁桥进行有限元分析。考虑的影响参数是 T 形梁间距、T 形梁高度、支撑厚度和 DTC 的安装位置。计算预应力混凝土T型梁桥的挠度和荷载分布系数，评价各参数对加固效果的影响。此外，研究了支撑厚度和T梁高度对DTC轴力和连接力的影响。结果表明，在跨中安装DTC的加固效果是最佳选择。随着T梁高度的增加，T梁的挠度减小，最大荷载分布系数增大。此外，增加DTC的支撑厚度或减小T形梁间距可提高加固效果。通过轴向力与屈曲临界力的比较，表明支撑的稳定性是足够的。最后给出了30 m预应力混凝土T型梁桥加固的设计建议。T型梁的挠度减小，最大荷载分布系数增加。此外，增加DTC的支撑厚度或减小T形梁间距可提高加固效果。通过轴向力与屈曲临界力的比较，表明支撑的稳定性是足够的。最后给出了30 m预应力混凝土T型梁桥加固的设计建议。T型梁的挠度减小，最大荷载分布系数增加。此外，增加DTC的支撑厚度或减小T形梁间距可提高加固效果。通过轴向力与屈曲临界力的比较，表明支撑的稳定性是足够的。最后给出了30 m预应力混凝土T型梁桥加固的设计建议。