Bewegliche Brücken für den Straßenverkehr in Deutschland

Movable bridges for road traffic in Germany. In Germany there are about 120000 fixed bridges for road traffic, on the other hand there are only 130 movable bridges for road traffic in practical application. In the following paper this bridge category is presented with partly very interested technical solutions. Flap bridges with scale beam, flap bridges with deep‐seated counterbalance, lifted bridges and swing‐bridges are treated. Some notable, built bridges are presented for every category. Finally special technical dates from nearly all built bridges are summarized in tables, which give a survey for the respective movable bridges in Germany.     

Anpassung des Verkehrslastmodells des DIN FB 101 für kommunale Brücken

Adjusted Traffic Load for Bridges under Communal Responsibility Recently the traffic loads of bridges of the EC1 have been introduced in Germany under the responsibility of the Federal Ministry of Transport, Building and Urban Affairs. Usually the Load Model LM1 has to be used for all new bridge structures with the adjusted values of α_Q1 = 0, 8, α_Q2 = 0, 8, α_Q3 = 0. A further classification has not been defined. This makes sense for the highway bridges and federal road bridges, because usually they have longer spans where a further reduction of the α‐values is not justified. In the sphere of influence of cities and villages the situation is totally different, because many bridges are short and are buildt as single span girder bridges or single frame bridges. In case of those bridges the LM1 leads to conservative results because the geometry and the total weight and the axle weight of the real lorries are limited and cannot develop those high inner forces and moments. The authors developed a proposal for further reduction of the α‐values dependent on the geometry and the statical system of the bridge without leaving the safety level of the Eurocode. Also for strengthening existing bridges these values can be used. The development has been undertaken in colaboration with the civil engineering offices in Frankfurth/Main, Leipzig and Stuttgart.