Study On Design Parameters Affecting The Seismic Response Of Curved Continuous Rigid Frame Bridges With Long-span And High-pier

Western region of China is a mountainous zone, with high mountains and deep gorges, steep terrain. Building bridges in these mountains, especially in high-ranked highway, is characterized by high piers, long span, complex horizontal line. Many of these are in earthquake-prone areas belt, earthquake load should not be overlooked Contrasted with short and medium span bridges, the bridges of high-pier and long-span, especially with curvature, have more complexity in analyzing earthquake response and earthquake resistant design. China's "Specifications of Earthquake Resistant Design for Highway Engineering" (JTJ004-89) currently adapts for the girder bridges under 150m and arch bridges, not involving the bridges with span beyond 150m. Though there is not applicable spans limit in the current "Railway earthquake design codes" (GBJ111-87), it clearly requires "special earthquake requirements for buildings and new structures should be devoted to special design." Therefore, to deeply study dynamic performance and earthquake response of this kind of bridge is necessary, and it is destined for the topic of science and technology projects for Western transportation construction.The paper, focusing on earthquake response of curved continuous rigid frame bridges with high pier and long span, carries out large quantity of numerical analysis, and studies synthetically the structural design parameters which influence the structural seismic response for the first time. Based on spatial rigid frames finite element method, ANSYS is employed to build up models taking into account several factors, and modal tests for the curved continuous rigid frame bridge indoors, using modal-separation technique, verifies the consistency of the theoretical results.Using cross test table, the paper puts forward the sensitive parameters to rigid frame bridges seismic response which include the pier height, the substructure calculation mode, wave-traveling effect, structural spans and the type of wave. The study shows the pier's height and the substructure calculation mode are sensitive parameters for structural seismic response.Single-factor method is adopted to analyze the structure type or design...