考虑护栏和桥面铺装联合作用预应力混凝土空心板桥静载试验分析
秦冰冰1，2，盛越越1，2，郭斌1，2
1.河南省中工设计研究院集团股份有限公司，河南 郑州 451450；2.中犇检测认证有限公司，河南 郑州 451450
摘要：为解决桥梁静载试验中理论计算模型与桥梁实际受力状态不一致的问题，采集某预应力混凝土空心板桥在加载车中载和偏载工况下的试验数据，分别与裸梁模型A、仅考虑桥面铺装模型B、同时考虑桥面铺装和护栏模型C计算的理论结果进行对比分析。结果表明：静载工况作用下，空心板桥梁的实测挠度和应变均小于3个模型的理论计算结果，但模型A的位移和应变校验系数整体过小，易对桥梁的实际承载状态造成误判，模型B的校验系数小于模型C；在偏载工况作用下，沿横桥向，模型A、B的理论计算跨中挠度与实测挠度变形趋势不一致，模型C的理论计算跨中挠度与实测跨中挠度变形趋势一致，最大挠度位于4#板梁；与模型A、B相比，模型C计算的边梁中性轴与实测边梁中性轴一致；因护栏和桥面铺装对梁板联合作用的影响，模型C更贴合桥梁结构实际受力状态。
关键词：预应力混凝土空心板；静载试验；桥面铺装和护栏；联合作用；计算模型
Static load test analysis of prestressed concrete hollow slab considering the combined action of guardrail and deck pavement
QIN Bingbing1,2, SHENG Yueyue1,2, GUO Bin1,2
1. Henan Zhonggong Design & Research Group Co., Ltd., Zhenghzou 451450, China;
2.Zhongben Testing Certification Co., Ltd., Zhengzhou 451450, China
Abstract: To address the issue of inconsistency between theoretical calculation models and the actual stress state of bridges during static load tests, experimental data are collected from a prestressed concrete hollow slab bridge under the loading vehicle′s action in both load and offset load conditions. These data are compared and analyzed against the theoretical results calculated from three models: bare beam model A, model B considering only the bridge deck pavement, and model C considering both the bridge deck pavement and the guardrails. The results indicate: Under static load conditions, the measured deflection and strain of the bridge are both less than thetheoretical calculation results from all three models; however, model A′s displacement and strain correction factors are overall too low, which may lead to misjudgment of the bridge′s actual load-bearing state, while model B′s correction factor is less than that of model C; under offset loading, in the transverse direction of the bridge, the theoretical midspan deflection of models A and B is inconsistent with the measured deflection trend, while model C′s theoretical midspan deflection aligns with the measured midspan deflection trend, with the maximum deflection located at slab 4#; compared with models A and B, model C′s calculated neutral axis of the edge beam is consistent with the measured neutral axis of the edge beam; due to the joint effect of the guardrail and bridge deck pavement on the beam-slab system, model C better reflects the actual stress state of the bridge structure.
Keywords: prestressed concrete hollow slab; static load test; bridge deck pavement and guard rail; combined action; calculation model
