地震区排架桥墩空心盖梁可行性研究初探

Preliminary Study on Feasibility of Hollow Bent Cap for Bent Piers in Earthquake Regions

摘要:

排架柱式桥墩在国内外中小跨径尤其是预制装配式桥梁中应用非常广泛。而对于山区高烈度地震区，在历次破坏性地震中该类桥梁桥墩震害普遍较严重。降低桥墩盖梁自身结构自重可降低桥梁墩柱结构的地震响应。在保证足够盖梁支撑宽度、防止“落梁”破坏的前提下，对排架桥墩盖梁进行“挖空”处理，从而减少盖梁自身结构自重。通过与常见的实心截面盖梁对比分析，对该新型结构形式的可实施性进行了初步探讨。

Abstract:

Bent column piers are widely used in small and medium-sized span bridges， especially in prefabricated assembly bridges at home and abroad. For the high-intensity seismic areas in mountainous areas， the damage to bridge piers of this type of bridge is generally severe in previous destructive earthquakes. The seismic response of pier column structure can be reduced by reducing the self-weight of pier bent cap structure. On the premise of ensuring the sufficient support width of bent cap and preventing the damage of “falling beam”， the bent cap of bent pier is “hollowed out” to reduce the self-weight of the bent cap structure. The implementability of the new structure is preliminarily discussed through the comparison and analysis with the common solid-section bent caps.